| <!DOCTYPE html> |
| <html lang="zh-CN"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title> </title> |
| <meta name="generator" content="VuePress 1.8.2"> |
| <link rel="icon" href="/favicon.ico"> |
| <script async="true" src="https://www.googletagmanager.com/gtag/js?id=G-5MM3J6X84E"></script> |
| <script> |
| window.dataLayer = window.dataLayer || []; |
| function gtag(){dataLayer.push(arguments);} |
| gtag('js', new Date()); |
| gtag('config', 'G-5MM3J6X84E');</script> |
| <meta name="description" content=" "> |
| <meta name="Description" content="Apache IoTDB: Time Series Database for IoT"> |
| <meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据"> |
| <meta name="baidu-site-verification" content="wfKETzB3OT"> |
| <meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo"> |
| |
| <link rel="preload" href="/assets/css/0.styles.dfd59be6.css" as="style"><link rel="preload" href="/assets/js/app.b493877d.js" as="script"><link rel="preload" href="/assets/js/3.36f2a167.js" as="script"><link rel="preload" href="/assets/js/4.e8b2d372.js" as="script"><link rel="preload" href="/assets/js/633.c6caf1a9.js" as="script"><link rel="prefetch" href="/assets/js/10.4edb8739.js"><link rel="prefetch" href="/assets/js/100.e32c1884.js"><link rel="prefetch" href="/assets/js/101.5909abfd.js"><link rel="prefetch" href="/assets/js/102.588b06d4.js"><link rel="prefetch" href="/assets/js/103.7e65f01d.js"><link rel="prefetch" href="/assets/js/104.6bb8c242.js"><link rel="prefetch" href="/assets/js/105.2d9f8734.js"><link rel="prefetch" href="/assets/js/106.dcfe5738.js"><link rel="prefetch" href="/assets/js/107.2617673c.js"><link rel="prefetch" href="/assets/js/108.30a4e7cb.js"><link rel="prefetch" href="/assets/js/109.60758941.js"><link rel="prefetch" href="/assets/js/11.e6c21699.js"><link rel="prefetch" href="/assets/js/110.60f90cfb.js"><link rel="prefetch" href="/assets/js/111.0bbb389c.js"><link rel="prefetch" href="/assets/js/112.8b8306b4.js"><link rel="prefetch" href="/assets/js/113.769e45d8.js"><link rel="prefetch" href="/assets/js/114.30875d22.js"><link rel="prefetch" href="/assets/js/115.de49e92f.js"><link rel="prefetch" href="/assets/js/116.0675918c.js"><link rel="prefetch" href="/assets/js/117.7fce739a.js"><link rel="prefetch" href="/assets/js/118.016d52ef.js"><link rel="prefetch" href="/assets/js/119.a98e04d4.js"><link rel="prefetch" href="/assets/js/12.2ebfdd53.js"><link rel="prefetch" href="/assets/js/120.733d4263.js"><link rel="prefetch" href="/assets/js/121.437bbfdf.js"><link rel="prefetch" href="/assets/js/122.1d44b351.js"><link rel="prefetch" href="/assets/js/123.c86d9177.js"><link rel="prefetch" href="/assets/js/124.30d86f64.js"><link rel="prefetch" href="/assets/js/125.105359a4.js"><link rel="prefetch" href="/assets/js/126.be1a5b7d.js"><link rel="prefetch" href="/assets/js/127.05bbd29c.js"><link rel="prefetch" href="/assets/js/128.2ab6413d.js"><link rel="prefetch" href="/assets/js/129.e0df372c.js"><link rel="prefetch" href="/assets/js/13.16053ad6.js"><link rel="prefetch" href="/assets/js/130.b5d1ff78.js"><link rel="prefetch" href="/assets/js/131.edd4d915.js"><link rel="prefetch" href="/assets/js/132.66eace9a.js"><link rel="prefetch" href="/assets/js/133.f6fe673f.js"><link rel="prefetch" href="/assets/js/134.d5449535.js"><link rel="prefetch" href="/assets/js/135.5afdfb12.js"><link rel="prefetch" href="/assets/js/136.be202224.js"><link rel="prefetch" href="/assets/js/137.69f033b0.js"><link rel="prefetch" href="/assets/js/138.53570517.js"><link rel="prefetch" href="/assets/js/139.d7b8ccbd.js"><link rel="prefetch" href="/assets/js/14.f8f59c2a.js"><link rel="prefetch" href="/assets/js/140.15f4a301.js"><link rel="prefetch" href="/assets/js/141.e78e96af.js"><link rel="prefetch" href="/assets/js/142.4b3c6341.js"><link rel="prefetch" href="/assets/js/143.b61da33d.js"><link rel="prefetch" href="/assets/js/144.13109098.js"><link rel="prefetch" href="/assets/js/145.2910703a.js"><link rel="prefetch" href="/assets/js/146.eee785de.js"><link rel="prefetch" href="/assets/js/147.9c5f9108.js"><link rel="prefetch" href="/assets/js/148.446dc146.js"><link rel="prefetch" href="/assets/js/149.b47a8c64.js"><link rel="prefetch" href="/assets/js/15.0e7120ba.js"><link rel="prefetch" href="/assets/js/150.be260406.js"><link rel="prefetch" href="/assets/js/151.f08b8df7.js"><link rel="prefetch" href="/assets/js/152.bfc874dc.js"><link rel="prefetch" href="/assets/js/153.908354d0.js"><link rel="prefetch" href="/assets/js/154.acbc0b06.js"><link rel="prefetch" href="/assets/js/155.54ff81f0.js"><link rel="prefetch" href="/assets/js/156.ad4ed76e.js"><link rel="prefetch" href="/assets/js/157.f57294ab.js"><link rel="prefetch" href="/assets/js/158.6b6b86c4.js"><link rel="prefetch" href="/assets/js/159.eef8e1b8.js"><link rel="prefetch" href="/assets/js/16.295928b4.js"><link rel="prefetch" href="/assets/js/160.4173f4df.js"><link rel="prefetch" href="/assets/js/161.48c44020.js"><link rel="prefetch" href="/assets/js/162.d51fd9a5.js"><link rel="prefetch" href="/assets/js/163.7888bce7.js"><link rel="prefetch" href="/assets/js/164.b571c627.js"><link rel="prefetch" href="/assets/js/165.426ee975.js"><link rel="prefetch" href="/assets/js/166.7a34ba2e.js"><link rel="prefetch" href="/assets/js/167.f9e7d6d7.js"><link rel="prefetch" href="/assets/js/168.2e424591.js"><link rel="prefetch" href="/assets/js/169.86a80840.js"><link rel="prefetch" href="/assets/js/17.2559538f.js"><link rel="prefetch" href="/assets/js/170.ec91aa0a.js"><link rel="prefetch" href="/assets/js/171.4b2e72bb.js"><link rel="prefetch" href="/assets/js/172.c09b4f97.js"><link rel="prefetch" href="/assets/js/173.da75a148.js"><link rel="prefetch" href="/assets/js/174.6f73adde.js"><link rel="prefetch" href="/assets/js/175.ad315790.js"><link rel="prefetch" href="/assets/js/176.3f724699.js"><link rel="prefetch" href="/assets/js/177.a3151747.js"><link rel="prefetch" href="/assets/js/178.3c9a3a4f.js"><link rel="prefetch" href="/assets/js/179.a910aed2.js"><link rel="prefetch" href="/assets/js/18.c946fc9e.js"><link rel="prefetch" href="/assets/js/180.b86e3e39.js"><link rel="prefetch" href="/assets/js/181.9b677b06.js"><link rel="prefetch" href="/assets/js/182.2a2e360e.js"><link rel="prefetch" href="/assets/js/183.8616e397.js"><link rel="prefetch" href="/assets/js/184.2f0ba776.js"><link rel="prefetch" href="/assets/js/185.b2bc837d.js"><link rel="prefetch" href="/assets/js/186.cda442f1.js"><link rel="prefetch" href="/assets/js/187.5add055b.js"><link rel="prefetch" href="/assets/js/188.b61258f5.js"><link rel="prefetch" href="/assets/js/189.650362a1.js"><link rel="prefetch" href="/assets/js/19.e2982c39.js"><link rel="prefetch" href="/assets/js/190.8cf8dd44.js"><link rel="prefetch" href="/assets/js/191.e6a5c5f1.js"><link rel="prefetch" href="/assets/js/192.2c81cd91.js"><link rel="prefetch" href="/assets/js/193.dff24d42.js"><link rel="prefetch" href="/assets/js/194.a23ae658.js"><link rel="prefetch" href="/assets/js/195.403fa29d.js"><link rel="prefetch" href="/assets/js/196.14bdaad4.js"><link rel="prefetch" href="/assets/js/197.039e1f8b.js"><link rel="prefetch" href="/assets/js/198.6e74aa45.js"><link rel="prefetch" href="/assets/js/199.bbab6676.js"><link rel="prefetch" href="/assets/js/20.e1823e38.js"><link rel="prefetch" href="/assets/js/200.8d16b664.js"><link rel="prefetch" href="/assets/js/201.0134faf9.js"><link rel="prefetch" href="/assets/js/202.e1e62160.js"><link rel="prefetch" href="/assets/js/203.71cb4dd3.js"><link rel="prefetch" href="/assets/js/204.f8940c37.js"><link rel="prefetch" href="/assets/js/205.89dba9c4.js"><link rel="prefetch" href="/assets/js/206.208c13e4.js"><link rel="prefetch" href="/assets/js/207.1abee6d6.js"><link rel="prefetch" href="/assets/js/208.ddd4c6a5.js"><link rel="prefetch" href="/assets/js/209.96d1f749.js"><link rel="prefetch" href="/assets/js/21.c721b8b4.js"><link rel="prefetch" href="/assets/js/210.6761a8e9.js"><link rel="prefetch" href="/assets/js/211.ac8a1ad6.js"><link rel="prefetch" href="/assets/js/212.e879965e.js"><link rel="prefetch" href="/assets/js/213.13ef564a.js"><link rel="prefetch" href="/assets/js/214.843f4613.js"><link rel="prefetch" href="/assets/js/215.f386e217.js"><link rel="prefetch" href="/assets/js/216.8b000a2e.js"><link rel="prefetch" href="/assets/js/217.9e0dbcea.js"><link rel="prefetch" href="/assets/js/218.d66cc109.js"><link rel="prefetch" href="/assets/js/219.e10cec2e.js"><link rel="prefetch" href="/assets/js/22.15bc349b.js"><link rel="prefetch" href="/assets/js/220.6db1650f.js"><link rel="prefetch" href="/assets/js/221.124d6abc.js"><link rel="prefetch" href="/assets/js/222.f30c55b3.js"><link rel="prefetch" href="/assets/js/223.ab2fdf0f.js"><link rel="prefetch" href="/assets/js/224.735d57cc.js"><link rel="prefetch" href="/assets/js/225.72ca67cb.js"><link rel="prefetch" href="/assets/js/226.98987095.js"><link rel="prefetch" href="/assets/js/227.37336d0b.js"><link rel="prefetch" href="/assets/js/228.11249673.js"><link rel="prefetch" href="/assets/js/229.798ef046.js"><link rel="prefetch" href="/assets/js/23.8bd0de87.js"><link rel="prefetch" href="/assets/js/230.4e6f23cd.js"><link rel="prefetch" href="/assets/js/231.01c2a835.js"><link rel="prefetch" href="/assets/js/232.abbd8004.js"><link rel="prefetch" href="/assets/js/233.a480915d.js"><link rel="prefetch" href="/assets/js/234.ad956d43.js"><link rel="prefetch" href="/assets/js/235.edbb351a.js"><link rel="prefetch" href="/assets/js/236.b2bbee7d.js"><link rel="prefetch" href="/assets/js/237.7c0a8e17.js"><link rel="prefetch" href="/assets/js/238.58f49362.js"><link rel="prefetch" href="/assets/js/239.bac6f876.js"><link rel="prefetch" href="/assets/js/24.3bebd8b6.js"><link rel="prefetch" href="/assets/js/240.f5c0e21d.js"><link rel="prefetch" href="/assets/js/241.6c71b230.js"><link rel="prefetch" href="/assets/js/242.6253e232.js"><link rel="prefetch" href="/assets/js/243.c7f2c552.js"><link rel="prefetch" href="/assets/js/244.596c7ad8.js"><link rel="prefetch" href="/assets/js/245.a691fc3e.js"><link rel="prefetch" href="/assets/js/246.04447706.js"><link rel="prefetch" href="/assets/js/247.051e9d20.js"><link rel="prefetch" href="/assets/js/248.c99d28e0.js"><link rel="prefetch" href="/assets/js/249.fe553ecc.js"><link rel="prefetch" href="/assets/js/25.827045e3.js"><link rel="prefetch" href="/assets/js/250.dce53728.js"><link rel="prefetch" href="/assets/js/251.5260896e.js"><link rel="prefetch" href="/assets/js/252.6c3d7cbf.js"><link rel="prefetch" href="/assets/js/253.154f41ff.js"><link rel="prefetch" href="/assets/js/254.e98223a7.js"><link rel="prefetch" href="/assets/js/255.cfa855d1.js"><link rel="prefetch" href="/assets/js/256.3b5dbf32.js"><link rel="prefetch" href="/assets/js/257.2e81ec35.js"><link rel="prefetch" href="/assets/js/258.c9c30010.js"><link rel="prefetch" href="/assets/js/259.0893a2dd.js"><link rel="prefetch" href="/assets/js/26.c8060b33.js"><link rel="prefetch" href="/assets/js/260.e3d297a8.js"><link rel="prefetch" href="/assets/js/261.d88ceb4a.js"><link rel="prefetch" href="/assets/js/262.7b6efe91.js"><link rel="prefetch" href="/assets/js/263.133d7c04.js"><link rel="prefetch" href="/assets/js/264.25538a8b.js"><link rel="prefetch" href="/assets/js/265.6cb51f52.js"><link rel="prefetch" href="/assets/js/266.5e58393b.js"><link rel="prefetch" href="/assets/js/267.7eeedb25.js"><link rel="prefetch" href="/assets/js/268.9bb37490.js"><link rel="prefetch" href="/assets/js/269.51fe45aa.js"><link rel="prefetch" href="/assets/js/27.2476b973.js"><link rel="prefetch" href="/assets/js/270.a63d78bb.js"><link rel="prefetch" href="/assets/js/271.f092eb51.js"><link rel="prefetch" href="/assets/js/272.218101f9.js"><link rel="prefetch" href="/assets/js/273.cc9005ca.js"><link rel="prefetch" href="/assets/js/274.21ea2106.js"><link rel="prefetch" href="/assets/js/275.f3c98861.js"><link rel="prefetch" href="/assets/js/276.6cbbbc45.js"><link rel="prefetch" href="/assets/js/277.95c6d871.js"><link rel="prefetch" href="/assets/js/278.a9a3c538.js"><link rel="prefetch" href="/assets/js/279.697c6519.js"><link rel="prefetch" href="/assets/js/28.830d54da.js"><link rel="prefetch" href="/assets/js/280.320c45a2.js"><link rel="prefetch" href="/assets/js/281.16c9f5fc.js"><link rel="prefetch" href="/assets/js/282.49292916.js"><link rel="prefetch" href="/assets/js/283.770627b9.js"><link rel="prefetch" href="/assets/js/284.63b23c43.js"><link rel="prefetch" href="/assets/js/285.1f54bcd2.js"><link rel="prefetch" href="/assets/js/286.435ffe43.js"><link rel="prefetch" href="/assets/js/287.000fe1ed.js"><link rel="prefetch" href="/assets/js/288.2ee3fbcf.js"><link rel="prefetch" href="/assets/js/289.ae848c11.js"><link rel="prefetch" href="/assets/js/29.6a364fd5.js"><link rel="prefetch" href="/assets/js/290.808b31b2.js"><link rel="prefetch" href="/assets/js/291.3db95b5d.js"><link rel="prefetch" href="/assets/js/292.0723d246.js"><link rel="prefetch" href="/assets/js/293.ad46fb07.js"><link rel="prefetch" href="/assets/js/294.f8b1688d.js"><link rel="prefetch" href="/assets/js/295.8aa15473.js"><link rel="prefetch" href="/assets/js/296.837d11ce.js"><link rel="prefetch" href="/assets/js/297.b7da2058.js"><link rel="prefetch" href="/assets/js/298.f6e8dbd4.js"><link rel="prefetch" href="/assets/js/299.f57ee830.js"><link rel="prefetch" href="/assets/js/30.c3589f5c.js"><link rel="prefetch" href="/assets/js/300.fb63423a.js"><link rel="prefetch" href="/assets/js/301.b3b4c61a.js"><link rel="prefetch" href="/assets/js/302.f51ce0db.js"><link rel="prefetch" href="/assets/js/303.81f8dae8.js"><link rel="prefetch" href="/assets/js/304.abe43f4a.js"><link rel="prefetch" href="/assets/js/305.03cb72cf.js"><link rel="prefetch" href="/assets/js/306.949f9ae7.js"><link rel="prefetch" href="/assets/js/307.dae20420.js"><link rel="prefetch" href="/assets/js/308.08db3d19.js"><link rel="prefetch" href="/assets/js/309.205ee0e1.js"><link rel="prefetch" href="/assets/js/31.747d17ce.js"><link rel="prefetch" href="/assets/js/310.e266d5d8.js"><link rel="prefetch" href="/assets/js/311.c3b33b32.js"><link rel="prefetch" href="/assets/js/312.a6059eac.js"><link rel="prefetch" href="/assets/js/313.b54eda30.js"><link rel="prefetch" href="/assets/js/314.7e5f5e65.js"><link rel="prefetch" href="/assets/js/315.ac1b4f72.js"><link rel="prefetch" href="/assets/js/316.a5a26b74.js"><link rel="prefetch" href="/assets/js/317.e167d1ff.js"><link rel="prefetch" href="/assets/js/318.6f794c9e.js"><link rel="prefetch" href="/assets/js/319.40e76b8f.js"><link rel="prefetch" href="/assets/js/32.386fc03f.js"><link rel="prefetch" href="/assets/js/320.3acf519a.js"><link rel="prefetch" href="/assets/js/321.26da8d77.js"><link rel="prefetch" href="/assets/js/322.0e756129.js"><link rel="prefetch" href="/assets/js/323.fb53ed25.js"><link rel="prefetch" href="/assets/js/324.ed0450b6.js"><link rel="prefetch" href="/assets/js/325.92df50c7.js"><link rel="prefetch" href="/assets/js/326.8c9baf46.js"><link rel="prefetch" href="/assets/js/327.9d67b4f9.js"><link rel="prefetch" href="/assets/js/328.b195e945.js"><link rel="prefetch" href="/assets/js/329.a9823cb8.js"><link rel="prefetch" href="/assets/js/33.aa1d80a6.js"><link rel="prefetch" href="/assets/js/330.28e4fe7b.js"><link rel="prefetch" href="/assets/js/331.2c16c983.js"><link rel="prefetch" href="/assets/js/332.f5b604d3.js"><link rel="prefetch" href="/assets/js/333.29070082.js"><link rel="prefetch" href="/assets/js/334.11ac71e8.js"><link rel="prefetch" href="/assets/js/335.a3fbb804.js"><link rel="prefetch" href="/assets/js/336.aca8d1cf.js"><link rel="prefetch" href="/assets/js/337.e93dc74c.js"><link rel="prefetch" href="/assets/js/338.0611d618.js"><link rel="prefetch" href="/assets/js/339.2c93b9de.js"><link rel="prefetch" href="/assets/js/34.fec188a0.js"><link rel="prefetch" href="/assets/js/340.e46de74f.js"><link rel="prefetch" href="/assets/js/341.0881e5ca.js"><link rel="prefetch" href="/assets/js/342.043c8a1d.js"><link rel="prefetch" href="/assets/js/343.b774d66b.js"><link rel="prefetch" href="/assets/js/344.7a03e1db.js"><link rel="prefetch" href="/assets/js/345.cbb88596.js"><link rel="prefetch" href="/assets/js/346.a50ffc5b.js"><link rel="prefetch" href="/assets/js/347.1079bfe2.js"><link rel="prefetch" href="/assets/js/348.2c2befda.js"><link rel="prefetch" href="/assets/js/349.4177df47.js"><link rel="prefetch" href="/assets/js/35.a7511c1e.js"><link rel="prefetch" href="/assets/js/350.03dbee9d.js"><link rel="prefetch" href="/assets/js/351.ed9940bc.js"><link rel="prefetch" href="/assets/js/352.b340afad.js"><link rel="prefetch" href="/assets/js/353.a2910e2e.js"><link rel="prefetch" href="/assets/js/354.62dfd436.js"><link rel="prefetch" href="/assets/js/355.a6f060c7.js"><link rel="prefetch" href="/assets/js/356.cfb7e8b6.js"><link rel="prefetch" href="/assets/js/357.abac2fb8.js"><link rel="prefetch" href="/assets/js/358.f9d8624e.js"><link rel="prefetch" href="/assets/js/359.c669b554.js"><link rel="prefetch" href="/assets/js/36.a68024d7.js"><link rel="prefetch" href="/assets/js/360.06951807.js"><link rel="prefetch" href="/assets/js/361.1c71afee.js"><link rel="prefetch" href="/assets/js/362.f9189a4c.js"><link rel="prefetch" href="/assets/js/363.0a958dca.js"><link rel="prefetch" href="/assets/js/364.cd36a8f1.js"><link rel="prefetch" href="/assets/js/365.cb5e6e9d.js"><link rel="prefetch" href="/assets/js/366.30576bcf.js"><link rel="prefetch" href="/assets/js/367.9efe7b95.js"><link rel="prefetch" href="/assets/js/368.d01bce84.js"><link rel="prefetch" href="/assets/js/369.e8e46e27.js"><link rel="prefetch" href="/assets/js/37.c842407e.js"><link rel="prefetch" href="/assets/js/370.f5f79c2d.js"><link rel="prefetch" href="/assets/js/371.fbf13f43.js"><link rel="prefetch" href="/assets/js/372.c12399fe.js"><link rel="prefetch" href="/assets/js/373.21e4ee34.js"><link rel="prefetch" href="/assets/js/374.02e17c1a.js"><link rel="prefetch" href="/assets/js/375.e374f6a6.js"><link rel="prefetch" href="/assets/js/376.f6c40562.js"><link rel="prefetch" href="/assets/js/377.6bf2f369.js"><link rel="prefetch" href="/assets/js/378.c1d19a6d.js"><link rel="prefetch" href="/assets/js/379.e7245460.js"><link rel="prefetch" href="/assets/js/38.528abae0.js"><link rel="prefetch" href="/assets/js/380.fd53c683.js"><link rel="prefetch" href="/assets/js/381.4778a324.js"><link rel="prefetch" href="/assets/js/382.b653ad40.js"><link rel="prefetch" href="/assets/js/383.8b3bf864.js"><link rel="prefetch" href="/assets/js/384.2532636e.js"><link rel="prefetch" href="/assets/js/385.512629c1.js"><link rel="prefetch" href="/assets/js/386.a516646c.js"><link rel="prefetch" href="/assets/js/387.df5cfccf.js"><link rel="prefetch" href="/assets/js/388.c05fe31a.js"><link rel="prefetch" href="/assets/js/389.aba06cdb.js"><link rel="prefetch" href="/assets/js/39.22df932f.js"><link rel="prefetch" href="/assets/js/390.a597fdab.js"><link rel="prefetch" href="/assets/js/391.382ea1ad.js"><link rel="prefetch" href="/assets/js/392.494ed939.js"><link rel="prefetch" href="/assets/js/393.e12395f8.js"><link rel="prefetch" href="/assets/js/394.f4cde47c.js"><link rel="prefetch" href="/assets/js/395.9bd210d3.js"><link rel="prefetch" href="/assets/js/396.08d84206.js"><link rel="prefetch" href="/assets/js/397.1da90060.js"><link rel="prefetch" href="/assets/js/398.56c016a8.js"><link rel="prefetch" href="/assets/js/399.32e967be.js"><link rel="prefetch" href="/assets/js/40.ee3735f7.js"><link rel="prefetch" href="/assets/js/400.c3600c71.js"><link rel="prefetch" href="/assets/js/401.986c9ff8.js"><link rel="prefetch" href="/assets/js/402.d372d7b3.js"><link rel="prefetch" href="/assets/js/403.b8d028bb.js"><link rel="prefetch" href="/assets/js/404.705ba8d2.js"><link rel="prefetch" href="/assets/js/405.37b0c141.js"><link rel="prefetch" href="/assets/js/406.bad0224d.js"><link rel="prefetch" href="/assets/js/407.6c21844a.js"><link rel="prefetch" href="/assets/js/408.26e11019.js"><link rel="prefetch" href="/assets/js/409.d7189740.js"><link rel="prefetch" href="/assets/js/41.a56f0e0d.js"><link rel="prefetch" href="/assets/js/410.10d7e9ff.js"><link rel="prefetch" href="/assets/js/411.d9151642.js"><link rel="prefetch" href="/assets/js/412.724d1b0f.js"><link rel="prefetch" href="/assets/js/413.2775c8b8.js"><link rel="prefetch" href="/assets/js/414.bdbf3f0a.js"><link rel="prefetch" href="/assets/js/415.e86badf8.js"><link rel="prefetch" href="/assets/js/416.f5289796.js"><link rel="prefetch" href="/assets/js/417.d7bff4dc.js"><link rel="prefetch" href="/assets/js/418.a382a0d5.js"><link rel="prefetch" href="/assets/js/419.673ae298.js"><link rel="prefetch" href="/assets/js/42.c88c6cb7.js"><link rel="prefetch" href="/assets/js/420.b897090a.js"><link rel="prefetch" href="/assets/js/421.cba01f3d.js"><link rel="prefetch" href="/assets/js/422.6717d347.js"><link rel="prefetch" href="/assets/js/423.3b565c5f.js"><link rel="prefetch" href="/assets/js/424.bc189702.js"><link rel="prefetch" href="/assets/js/425.b13cf7e2.js"><link rel="prefetch" href="/assets/js/426.85facae9.js"><link rel="prefetch" href="/assets/js/427.cd9d1117.js"><link rel="prefetch" href="/assets/js/428.5382765c.js"><link rel="prefetch" href="/assets/js/429.85fcab26.js"><link rel="prefetch" href="/assets/js/43.f317f65a.js"><link rel="prefetch" href="/assets/js/430.0b22b153.js"><link rel="prefetch" href="/assets/js/431.abb01683.js"><link rel="prefetch" href="/assets/js/432.8fc14eca.js"><link rel="prefetch" href="/assets/js/433.5ed8e668.js"><link rel="prefetch" href="/assets/js/434.45967f53.js"><link rel="prefetch" href="/assets/js/435.1d46d1f1.js"><link rel="prefetch" href="/assets/js/436.bce2f434.js"><link rel="prefetch" href="/assets/js/437.4aedbf63.js"><link rel="prefetch" href="/assets/js/438.c932adec.js"><link rel="prefetch" href="/assets/js/439.feddfb3c.js"><link rel="prefetch" href="/assets/js/44.cea02a90.js"><link rel="prefetch" href="/assets/js/440.a858448d.js"><link rel="prefetch" href="/assets/js/441.a6f61670.js"><link rel="prefetch" href="/assets/js/442.fc764806.js"><link rel="prefetch" href="/assets/js/443.2856d42a.js"><link rel="prefetch" href="/assets/js/444.ede02c55.js"><link rel="prefetch" href="/assets/js/445.a38db554.js"><link rel="prefetch" href="/assets/js/446.7a074dbc.js"><link rel="prefetch" href="/assets/js/447.7b1adc9b.js"><link rel="prefetch" href="/assets/js/448.f7fb6ce4.js"><link rel="prefetch" href="/assets/js/449.5164d5c4.js"><link rel="prefetch" href="/assets/js/45.84143f3d.js"><link rel="prefetch" href="/assets/js/450.1f2d7b55.js"><link rel="prefetch" href="/assets/js/451.576350e3.js"><link rel="prefetch" href="/assets/js/452.d7f0d7c4.js"><link rel="prefetch" href="/assets/js/453.76dad370.js"><link rel="prefetch" href="/assets/js/454.114f66a3.js"><link rel="prefetch" href="/assets/js/455.75ba38f5.js"><link rel="prefetch" href="/assets/js/456.74f0af71.js"><link rel="prefetch" href="/assets/js/457.a18caa33.js"><link rel="prefetch" href="/assets/js/458.610ca0ae.js"><link rel="prefetch" href="/assets/js/459.5fda757e.js"><link rel="prefetch" href="/assets/js/46.4f4f600c.js"><link rel="prefetch" href="/assets/js/460.305198e1.js"><link rel="prefetch" href="/assets/js/461.c6769bd2.js"><link rel="prefetch" href="/assets/js/462.884af178.js"><link rel="prefetch" href="/assets/js/463.1e03891c.js"><link rel="prefetch" href="/assets/js/464.a0cfdf31.js"><link rel="prefetch" href="/assets/js/465.da82bf35.js"><link rel="prefetch" href="/assets/js/466.eb0f0bc4.js"><link rel="prefetch" href="/assets/js/467.f970a38a.js"><link rel="prefetch" href="/assets/js/468.cc9bc069.js"><link rel="prefetch" href="/assets/js/469.7e24e317.js"><link rel="prefetch" href="/assets/js/47.391d6d34.js"><link rel="prefetch" href="/assets/js/470.e46175db.js"><link rel="prefetch" href="/assets/js/471.8aa6e226.js"><link rel="prefetch" href="/assets/js/472.e7408a09.js"><link rel="prefetch" href="/assets/js/473.0ec972d4.js"><link rel="prefetch" href="/assets/js/474.d6dfbb70.js"><link rel="prefetch" href="/assets/js/475.dfe3f963.js"><link rel="prefetch" href="/assets/js/476.d90c8c3b.js"><link rel="prefetch" href="/assets/js/477.a77ca598.js"><link rel="prefetch" href="/assets/js/478.d35e1d75.js"><link rel="prefetch" href="/assets/js/479.bb449662.js"><link rel="prefetch" href="/assets/js/48.9c982d00.js"><link rel="prefetch" href="/assets/js/480.2999750d.js"><link rel="prefetch" href="/assets/js/481.4a0bc1ab.js"><link rel="prefetch" href="/assets/js/482.eea7f179.js"><link rel="prefetch" href="/assets/js/483.49da315e.js"><link rel="prefetch" href="/assets/js/484.95c9d494.js"><link rel="prefetch" href="/assets/js/485.66272af9.js"><link rel="prefetch" href="/assets/js/486.3c655941.js"><link rel="prefetch" href="/assets/js/487.28dec17e.js"><link rel="prefetch" href="/assets/js/488.d7ce882f.js"><link rel="prefetch" href="/assets/js/489.a32e1e8c.js"><link rel="prefetch" href="/assets/js/49.068aaa41.js"><link rel="prefetch" href="/assets/js/490.e52db144.js"><link rel="prefetch" href="/assets/js/491.910fda30.js"><link rel="prefetch" href="/assets/js/492.58d91109.js"><link rel="prefetch" href="/assets/js/493.1f5fc3a7.js"><link rel="prefetch" href="/assets/js/494.3d110a73.js"><link rel="prefetch" href="/assets/js/495.0bd92481.js"><link rel="prefetch" href="/assets/js/496.3efe41c9.js"><link rel="prefetch" href="/assets/js/497.8afea5c8.js"><link rel="prefetch" href="/assets/js/498.c7064f63.js"><link rel="prefetch" href="/assets/js/499.d12c6987.js"><link rel="prefetch" href="/assets/js/5.73be05a2.js"><link rel="prefetch" href="/assets/js/50.d51914be.js"><link rel="prefetch" href="/assets/js/500.0a64abde.js"><link rel="prefetch" href="/assets/js/501.9d4ecc40.js"><link rel="prefetch" href="/assets/js/502.ca9f5142.js"><link rel="prefetch" href="/assets/js/503.a0bcf2c4.js"><link rel="prefetch" href="/assets/js/504.cd4d2520.js"><link rel="prefetch" href="/assets/js/505.b141fc2f.js"><link rel="prefetch" href="/assets/js/506.2b860a4f.js"><link rel="prefetch" href="/assets/js/507.2b7ea9f3.js"><link rel="prefetch" href="/assets/js/508.f9f4a83e.js"><link rel="prefetch" href="/assets/js/509.9a4450cc.js"><link rel="prefetch" href="/assets/js/51.23e52d62.js"><link rel="prefetch" href="/assets/js/510.155850e5.js"><link rel="prefetch" href="/assets/js/511.6e36e45a.js"><link rel="prefetch" href="/assets/js/512.1d702ed3.js"><link rel="prefetch" href="/assets/js/513.44742583.js"><link rel="prefetch" href="/assets/js/514.b0c5aeea.js"><link rel="prefetch" href="/assets/js/515.7c516c01.js"><link rel="prefetch" href="/assets/js/516.f758113c.js"><link rel="prefetch" href="/assets/js/517.e31aa14e.js"><link rel="prefetch" href="/assets/js/518.42a6607b.js"><link rel="prefetch" href="/assets/js/519.fe7b1c58.js"><link rel="prefetch" href="/assets/js/52.0052906b.js"><link rel="prefetch" href="/assets/js/520.9491165d.js"><link rel="prefetch" href="/assets/js/521.c3d7975f.js"><link rel="prefetch" href="/assets/js/522.f8b7ae9d.js"><link rel="prefetch" href="/assets/js/523.dc10895f.js"><link rel="prefetch" href="/assets/js/524.6a0e377a.js"><link rel="prefetch" href="/assets/js/525.e696d9f7.js"><link rel="prefetch" href="/assets/js/526.07d802e0.js"><link rel="prefetch" href="/assets/js/527.a2efdb2c.js"><link rel="prefetch" href="/assets/js/528.82faddc6.js"><link rel="prefetch" href="/assets/js/529.e1ea61e6.js"><link rel="prefetch" href="/assets/js/53.355eef4b.js"><link rel="prefetch" href="/assets/js/530.bad2a4c4.js"><link rel="prefetch" href="/assets/js/531.7a29c383.js"><link rel="prefetch" href="/assets/js/532.becd54dc.js"><link rel="prefetch" href="/assets/js/533.8be096c9.js"><link rel="prefetch" href="/assets/js/534.6f2850f2.js"><link rel="prefetch" href="/assets/js/535.e5e1699d.js"><link rel="prefetch" href="/assets/js/536.525c8c35.js"><link rel="prefetch" href="/assets/js/537.bbe1ce1c.js"><link rel="prefetch" href="/assets/js/538.eed3705e.js"><link rel="prefetch" href="/assets/js/539.94bfc732.js"><link rel="prefetch" href="/assets/js/54.9e6534d4.js"><link rel="prefetch" href="/assets/js/540.bdad07fa.js"><link rel="prefetch" href="/assets/js/541.8951025b.js"><link rel="prefetch" href="/assets/js/542.311e6acf.js"><link rel="prefetch" href="/assets/js/543.5168ab7a.js"><link rel="prefetch" href="/assets/js/544.6197286e.js"><link rel="prefetch" href="/assets/js/545.5b1b96b7.js"><link rel="prefetch" href="/assets/js/546.219c08f2.js"><link rel="prefetch" href="/assets/js/547.26afb7f1.js"><link rel="prefetch" href="/assets/js/548.66fa5527.js"><link rel="prefetch" href="/assets/js/549.8b903f92.js"><link rel="prefetch" href="/assets/js/55.cad6aefd.js"><link rel="prefetch" href="/assets/js/550.e8b09ede.js"><link rel="prefetch" href="/assets/js/551.bccd9e7d.js"><link rel="prefetch" href="/assets/js/552.b2582603.js"><link rel="prefetch" href="/assets/js/553.c674a7dd.js"><link rel="prefetch" href="/assets/js/554.99eb0e76.js"><link rel="prefetch" href="/assets/js/555.208ce960.js"><link rel="prefetch" href="/assets/js/556.4217fff1.js"><link rel="prefetch" href="/assets/js/557.28938fbc.js"><link rel="prefetch" href="/assets/js/558.ef2b224e.js"><link rel="prefetch" href="/assets/js/559.1e362c69.js"><link rel="prefetch" href="/assets/js/56.f701ac7d.js"><link rel="prefetch" href="/assets/js/560.3e425f64.js"><link rel="prefetch" href="/assets/js/561.cae07e2f.js"><link rel="prefetch" href="/assets/js/562.e24b7e8d.js"><link rel="prefetch" href="/assets/js/563.4f934e4d.js"><link rel="prefetch" href="/assets/js/564.fb2b3f95.js"><link rel="prefetch" href="/assets/js/565.ef91b9cb.js"><link rel="prefetch" href="/assets/js/566.9373466d.js"><link rel="prefetch" href="/assets/js/567.dc16d0e9.js"><link rel="prefetch" href="/assets/js/568.b092decc.js"><link rel="prefetch" href="/assets/js/569.acad8f8c.js"><link rel="prefetch" href="/assets/js/57.c4bbdc48.js"><link rel="prefetch" href="/assets/js/570.41236922.js"><link rel="prefetch" href="/assets/js/571.3621a653.js"><link rel="prefetch" href="/assets/js/572.e51007a3.js"><link rel="prefetch" href="/assets/js/573.5d9cdcbf.js"><link rel="prefetch" href="/assets/js/574.40b0ac96.js"><link rel="prefetch" href="/assets/js/575.98e3fafe.js"><link rel="prefetch" href="/assets/js/576.bbe12bb4.js"><link rel="prefetch" href="/assets/js/577.5a68e9ec.js"><link rel="prefetch" href="/assets/js/578.b1fafbe7.js"><link rel="prefetch" href="/assets/js/579.e91083d6.js"><link rel="prefetch" href="/assets/js/58.4dba1e1e.js"><link rel="prefetch" href="/assets/js/580.0e98798b.js"><link rel="prefetch" href="/assets/js/581.49aecccc.js"><link rel="prefetch" href="/assets/js/582.68c764f4.js"><link rel="prefetch" href="/assets/js/583.1b1717c3.js"><link rel="prefetch" href="/assets/js/584.01d9a07a.js"><link rel="prefetch" href="/assets/js/585.fd225339.js"><link rel="prefetch" href="/assets/js/586.f2c93803.js"><link rel="prefetch" href="/assets/js/587.402e97af.js"><link rel="prefetch" href="/assets/js/588.11351c65.js"><link rel="prefetch" href="/assets/js/589.b92ab06a.js"><link rel="prefetch" href="/assets/js/59.72422de6.js"><link rel="prefetch" href="/assets/js/590.e549e9eb.js"><link rel="prefetch" href="/assets/js/591.bf714fd3.js"><link rel="prefetch" href="/assets/js/592.401448c4.js"><link rel="prefetch" href="/assets/js/593.b308c70f.js"><link rel="prefetch" href="/assets/js/594.874a9d1e.js"><link rel="prefetch" href="/assets/js/595.7576e6f0.js"><link rel="prefetch" href="/assets/js/596.f7791fe6.js"><link rel="prefetch" href="/assets/js/597.1920607d.js"><link rel="prefetch" href="/assets/js/598.6ba8d0e3.js"><link rel="prefetch" href="/assets/js/599.b1b37575.js"><link rel="prefetch" href="/assets/js/6.5a8223c6.js"><link rel="prefetch" href="/assets/js/60.282a495f.js"><link rel="prefetch" href="/assets/js/600.a68f0fa8.js"><link rel="prefetch" href="/assets/js/601.9e0ce5d9.js"><link rel="prefetch" href="/assets/js/602.623982b3.js"><link rel="prefetch" href="/assets/js/603.c219d4c2.js"><link rel="prefetch" href="/assets/js/604.6dfe7aa7.js"><link rel="prefetch" href="/assets/js/605.93614f30.js"><link rel="prefetch" href="/assets/js/606.f664e53e.js"><link rel="prefetch" href="/assets/js/607.f7a35555.js"><link rel="prefetch" href="/assets/js/608.dd82c709.js"><link rel="prefetch" href="/assets/js/609.785eaf86.js"><link rel="prefetch" href="/assets/js/61.96ccb830.js"><link rel="prefetch" href="/assets/js/610.20254122.js"><link rel="prefetch" href="/assets/js/611.a01c7312.js"><link rel="prefetch" href="/assets/js/612.9437a7f2.js"><link rel="prefetch" href="/assets/js/613.ed2feedd.js"><link rel="prefetch" href="/assets/js/614.a964280b.js"><link rel="prefetch" href="/assets/js/615.5280a555.js"><link rel="prefetch" href="/assets/js/616.6e1ab28f.js"><link rel="prefetch" href="/assets/js/617.8b586d26.js"><link rel="prefetch" href="/assets/js/618.455cdfd0.js"><link rel="prefetch" href="/assets/js/619.c0557adc.js"><link rel="prefetch" href="/assets/js/62.4b8d1565.js"><link rel="prefetch" href="/assets/js/620.756eabeb.js"><link rel="prefetch" href="/assets/js/621.002ea3c1.js"><link rel="prefetch" href="/assets/js/622.53148bda.js"><link rel="prefetch" href="/assets/js/623.7730d16d.js"><link rel="prefetch" href="/assets/js/624.156c7c4c.js"><link rel="prefetch" href="/assets/js/625.4635817f.js"><link rel="prefetch" href="/assets/js/626.c016ec2d.js"><link rel="prefetch" href="/assets/js/627.7b5a06e4.js"><link rel="prefetch" href="/assets/js/628.0232199c.js"><link rel="prefetch" href="/assets/js/629.64c57f4d.js"><link rel="prefetch" href="/assets/js/63.88c4f28c.js"><link rel="prefetch" href="/assets/js/630.b4e07501.js"><link rel="prefetch" href="/assets/js/631.e1447175.js"><link rel="prefetch" href="/assets/js/632.7df4e665.js"><link rel="prefetch" href="/assets/js/634.363ac8b3.js"><link rel="prefetch" href="/assets/js/635.f9fa7c7f.js"><link rel="prefetch" href="/assets/js/636.9132c6ad.js"><link rel="prefetch" href="/assets/js/637.e6cc7db7.js"><link rel="prefetch" href="/assets/js/638.6c0a88b6.js"><link rel="prefetch" href="/assets/js/639.f7cc6473.js"><link rel="prefetch" href="/assets/js/64.9a6df426.js"><link rel="prefetch" href="/assets/js/640.c2b4cc27.js"><link rel="prefetch" href="/assets/js/641.ab38aace.js"><link rel="prefetch" href="/assets/js/642.55223fb2.js"><link rel="prefetch" href="/assets/js/643.56768b79.js"><link rel="prefetch" href="/assets/js/644.69805af7.js"><link rel="prefetch" href="/assets/js/645.08c756b1.js"><link rel="prefetch" href="/assets/js/646.465916bd.js"><link rel="prefetch" href="/assets/js/647.317cd52a.js"><link rel="prefetch" href="/assets/js/648.037a16a8.js"><link rel="prefetch" href="/assets/js/649.c18e5bf3.js"><link rel="prefetch" href="/assets/js/65.f744bda5.js"><link rel="prefetch" href="/assets/js/650.f3119261.js"><link rel="prefetch" href="/assets/js/651.317905f4.js"><link rel="prefetch" href="/assets/js/652.fea1d9e9.js"><link rel="prefetch" href="/assets/js/653.3fe6e9b1.js"><link rel="prefetch" href="/assets/js/66.db50b75d.js"><link rel="prefetch" href="/assets/js/67.dace53ae.js"><link rel="prefetch" href="/assets/js/68.a528b703.js"><link rel="prefetch" href="/assets/js/69.9e6a4770.js"><link rel="prefetch" href="/assets/js/7.8b0df68c.js"><link rel="prefetch" href="/assets/js/70.846f7657.js"><link rel="prefetch" href="/assets/js/71.373b6020.js"><link rel="prefetch" href="/assets/js/72.638bf82c.js"><link rel="prefetch" href="/assets/js/73.bf3f33f7.js"><link rel="prefetch" href="/assets/js/74.07e41cb4.js"><link rel="prefetch" href="/assets/js/75.4df0ecfb.js"><link rel="prefetch" href="/assets/js/76.d6158739.js"><link rel="prefetch" href="/assets/js/77.bfaf08a4.js"><link rel="prefetch" href="/assets/js/78.b1c8cfd8.js"><link rel="prefetch" href="/assets/js/79.2ad5f6f1.js"><link rel="prefetch" href="/assets/js/8.9dde7893.js"><link rel="prefetch" href="/assets/js/80.32870e7f.js"><link rel="prefetch" href="/assets/js/81.c2340fba.js"><link rel="prefetch" href="/assets/js/82.d0aed17d.js"><link rel="prefetch" href="/assets/js/83.d9a7ebd1.js"><link rel="prefetch" href="/assets/js/84.ab419ff1.js"><link rel="prefetch" href="/assets/js/85.4d728e57.js"><link rel="prefetch" href="/assets/js/86.8e43b113.js"><link rel="prefetch" href="/assets/js/87.d5b61489.js"><link rel="prefetch" href="/assets/js/88.361d9ec9.js"><link rel="prefetch" href="/assets/js/89.306565de.js"><link rel="prefetch" href="/assets/js/9.15e59c54.js"><link rel="prefetch" href="/assets/js/90.ba2f03a3.js"><link rel="prefetch" href="/assets/js/91.6255df98.js"><link rel="prefetch" href="/assets/js/92.7e91a195.js"><link rel="prefetch" href="/assets/js/93.e8819b8d.js"><link rel="prefetch" href="/assets/js/94.77bc851b.js"><link rel="prefetch" href="/assets/js/95.3a681bae.js"><link rel="prefetch" href="/assets/js/96.037fe0f8.js"><link rel="prefetch" href="/assets/js/97.5ab7c0f0.js"><link rel="prefetch" href="/assets/js/98.f4474edd.js"><link rel="prefetch" href="/assets/js/99.609b0738.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.1288603f.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.dfd59be6.css"> |
| </head> |
| <body> |
| <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/zh/" class="home-link router-link-active"><img src="/img/logo.png" alt=" " class="logo"></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
| Wiki |
| <!----></a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| GitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/QuickStart/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.12.x/QuickStart/QuickStart.html" class="nav-link">V0.12.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
| Wiki |
| <!----></a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| GitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.9.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-概览</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>4-客户端</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.9.x/4-Client/1-Command Line Interface.html" class="sidebar-link">命令行接口 (CLI)</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/2-Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/3-Programming - Session.html" class="sidebar-link">Session</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/4-Programming - Other Languages.html" class="sidebar-link">其他语言</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="active sidebar-link">TsFile API</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="编程-tsfile-api"><a href="#编程-tsfile-api" class="header-anchor">#</a> 编程-TsFile API</h1> <p>TsFile是我们在IoTDB中使用的时间序列的文件格式。 在本节中，我们要介绍这种文件格式的用法。</p> <h2 id="ts文件库安装"><a href="#ts文件库安装" class="header-anchor">#</a> Ts文件库安装</h2> <p>在您自己的项目中有两种使用TsFile的方法。</p> <ul><li><p>用作jars：</p> <ul><li><p>编译源代码并构建为jars</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>git clone https://github.com/apache/incubator-iotdb.git |
| cd tsfile/ |
| mvn clean package -Dmaven.test.skip=true |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>然后，所有的jar都可以放在名为“ target /”的文件夹中。 将<code>target / tsfile-0.9.3-jar-with-dependencies.jar</code>导入您的项目。</p></li></ul></li> <li><p>用作Maven依赖项：</p> <p>编译源代码并通过三个步骤将其部署到本地存储库：</p> <ul><li><p>获取源代码</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>git clone https://github.com/apache/incubator-iotdb.git |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>编译源代码并部署</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>cd tsfile/ |
| mvn clean install -Dmaven.test.skip=true |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>在项目中添加依赖项：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>tsfile</artifactId> |
| <version>0.9.3</version> |
| </dependency> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></li></ul> <p>或者，您可以从官方Maven存储库下载依赖项：</p> <ul><li><p>第一, 在路径上找到您的Maven<code>settings.xml</code>: <code>${username}\.m2\settings.xml</code> |
| , 将 <code><profile></code> 加入到 <code><profiles></code>:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> <profile> |
| <id>allow-snapshots</id> |
| <activation><activeByDefault>true</activeByDefault></activation> |
| <repositories> |
| <repository> |
| <id>apache.snapshots</id> |
| <name>Apache Development Snapshot Repository</name> |
| <url>https://repository.apache.org/content/repositories/snapshots/</url> |
| <releases> |
| <enabled>false</enabled> |
| </releases> |
| <snapshots> |
| <enabled>true</enabled> |
| </snapshots> |
| </repository> |
| </repositories> |
| </profile> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br></div></div></li> <li><p>然后将依赖项添加到您的项目中：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>tsfile</artifactId> |
| <version>0.9.3</version> |
| </dependency> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></li></ul></li></ul> <h2 id="tsfile的用法"><a href="#tsfile的用法" class="header-anchor">#</a> TSFile的用法</h2> <p>本节演示TsFile的详细用法。</p> <h3 id="时间序列数据"><a href="#时间序列数据" class="header-anchor">#</a> 时间序列数据</h3> <p>时间序列被视为四倍序列。 四元组定义为（设备，测量，时间，值）。</p> <ul><li><p><strong>测量</strong>: 时间序列进行的物理或形式测量，例如城市温度，某些商品的销售数量或火车在不同时间的速度。 由于传统的传感器（例如温度计）也需要进行一次测量并生成一个时间序列，因此我们将在下面互换使用测量和传感器。</p></li> <li><p><strong>设备</strong>: 设备是指正在执行多个测量（产生多个时间序列）的实体，例如，运行中的火车监视其速度，油表，行驶里程，当前乘客均被传送到一个时间序列。</p></li></ul> <p>表1说明了一组时间序列数据。 下表中显示的集合包含一个名为“ device \ _1”的设备以及三个名为“ sensor \ _1”，“ sensor \ _2”和“ sensor \ _3”的测量值。</p> <table style="text-align:center;"><tr><th colspan="6">device_1</th></tr> <tr><th colspan="2">sensor_1</th><th colspan="2">sensor_2</th><th colspan="2">sensor_3</th></tr> <tr><th>time</th><th>value</th><th>time</th><th>value</th><th>time</th><th>value</th></tr> <tr><td>1</td><td>1.2</td><td>1</td><td>20</td><td>2</td><td>50</td></tr> <tr><td>3</td><td>1.4</td><td>2</td><td>20</td><td>4</td><td>51</td></tr> <tr><td>5</td><td>1.1</td><td>3</td><td>21</td><td>6</td><td>52</td></tr> <tr><td>7</td><td>1.8</td><td>4</td><td>20</td><td>8</td><td>53</td></tr></table> <span>一组时间序列数据</span> <p><strong>一行数据</strong>:在许多工业应用中，设备通常包含多个传感器，并且这些传感器可能在同一时间戳上具有值，这称为一行数据。</p> <p>形式上，一行数据由一个<code>device_id</code>，一个指示自1970年1月1日以来的毫秒数，00：00：00组成的时间戳，以及由<code>measurement_id</code>和对应的<code>value</code>组成的几对数据组成。 一行中的所有数据对都属于该<code>device_id</code>，并且具有相同的时间戳。 如果其中一个<code>measurements</code> 在<code>timestamp</code>中没有<code>value</code> ，请改用空格（实际上，TsFile不存储空值）。 其格式如下所示：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>device_id, timestamp, <measurement_id, value>... |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>一个示例如下所示。 在此示例中，两个测量的数据类型分别为“ INT32”和“ FLOAT”。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>device_1, 1490860659000, m1, 10, m2, 12.12 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="编写tsfile"><a href="#编写tsfile" class="header-anchor">#</a> 编写TsFile</h3> <h4 id="生成一个tsfile文件"><a href="#生成一个tsfile文件" class="header-anchor">#</a> 生成一个TsFile文件</h4> <p>可以通过以下三个步骤来生成TsFile，完整的代码将在“编写TsFile的示例”部分中给出。</p> <ul><li><p>一，构造一个<code>TsFileWriter</code>实例。</p> <p>以下是可用的构造函数：</p> <ul><li>没有预定义的架构</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(File file) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>使用预定义的架构</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(File file, Schema schema) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这是用于使用HDFS文件系统的。 <code>TsFileOutput</code>可以是<code>HDFSOutput</code>类的实例。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(TsFileOutput output, Schema schema) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如果您想自己设置一些TSFile配置，则可以使用param<code>config</code>。 例如：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig conf = new TSFileConfig(); |
| conf.setTSFileStorageFs("HDFS"); |
| TsFileWriter tsFileWriter = new TsFileWriter(file, schema, conf); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>在此示例中，数据文件将存储在HDFS中，而不是本地文件系统中。 如果要将数据文件存储在本地文件系统中，则可以使用<code>conf.setTSFileStorageFs（“ LOCAL”）</code>，这也是默认配置。</p> <p>您也可以通过<code>config.setHdfsIp（...）</code>和<code>config.setHdfsPort（...）</code>配置HDFS的IP和端口。 默认ip为<code>localhost</code>，默认端口为<code>9000</code>。</p> <p><strong>Parameters:</strong></p> <ul><li><p>file：要写入的TsFile</p></li> <li><p>schema：文件模式将在下一部分中介绍。</p></li> <li><p>config：TsFile的配置。</p></li></ul></li> <li><p>二，添加测量</p> <p>或者，您可以先创建<code>Schema</code>类的实例，然后将其传递给<code>TsFileWriter</code>类的构造函数。<code>Schema</code>类包含一个映射，该映射的键是一个度量模式的名称，而值是该模式本身。</p> <p>这里是接口：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>// 创建一个空的架构或从现有的映射 |
| public Schema() |
| public Schema(Map<String, MeasurementSchema> measurements) |
| // Use this two interfaces to add measurements |
| public void registerMeasurement(MeasurementSchema descriptor) |
| public void registerMeasurements(Map<String, MeasurementSchema> measurements) |
| // 一些有用的吸气剂和检查剂 |
| public TSDataType getMeasurementDataType(String measurementId) |
| public MeasurementSchema getMeasurementSchema(String measurementId) |
| public Map<String, MeasurementSchema> getAllMeasurementSchema() |
| public boolean hasMeasurement(String measurementId) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>您始终可以在<code>TsFileWriter</code>类中使用以下接口来添加其他度量：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void addMeasurement(MeasurementSchema measurementSchema) throws WriteProcessException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><code>MeasurementSchema</code>类包含一种度量的信息，有几种构造函数：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding) |
| public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType) |
| public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType, |
| Map<String, String> props) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p><strong>参数：</strong> |
| </p> <ul><li><p>measurementID：此测量的名称，通常是传感器的名称。</p></li> <li><p>类型：数据类型，现在支持六种类型：<code>BOOLEAN</code>，<code>INT32</code>，<code>INT64</code>，<code>FLOAT</code>，<code>DOUBLE</code>，<code>TEXT</code>。</p></li> <li><p>encoding：数据编码。 见 <a href="/document/V0.9.x/UserGuide/2-Concept/3-Encoding.html">Chapter 2-3</a>.</p></li> <li><p>compression：数据压缩。 现在支持<code>UNCOMPRESSED</code>和<code>SNAPPY</code>。</p></li> <li><p>props：特殊数据类型的属性，例如<code>FLOAT</code>和<code>DOUBLE</code>的<code>max_point_number</code>，<code>TEXT</code>的<code>max_string_length</code>。 用作字符串对，例如（“ max_point_number”，“ 3”）。</p></li></ul> <blockquote><p>**注意：**尽管一个度量名称可以在多个deltaObject中使用，但是不能更改属性。 即 不允许多次使用不同的类型或编码添加一个测量名称。 |
| 这是一个不好的例子：</p></blockquote> <div class="language- extra-class"><pre><code> // 测量值“ sensor_1”为浮点型 |
| addMeasurement(new MeasurementSchema("sensor_1", TSDataType.FLOAT, TSEncoding.RLE)); |
| |
| // 此调用将引发WriteProcessException异常 |
| addMeasurement(new MeasurementSchema("sensor_1", TSDataType.INT32, TSEncoding.RLE)); |
| </code></pre></div></li> <li><p>第三，连续插入和写入数据。 |
| 使用此接口可以创建新的<code>TSRecord</code>（时间戳和设备对）。</p></li> <li><div class="language- line-numbers-mode"><pre class="language-text"><code> public TSRecord(long timestamp, String deviceId) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>然后创建一个<code>DataPoint</code>（一个测量值和一个值对），并使用addTuple方法将DataPoint添加到正确的TsRecord。 |
| 用这种方法写</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void write(TSRecord record) throws IOException, WriteProcessException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>最后，调用<code>close</code>完成此编写过程。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void close() throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li></ul> <h4 id="编写tsfile的示例"><a href="#编写tsfile的示例" class="header-anchor">#</a> 编写TsFile的示例</h4> <p>您应该将TsFile安装到本地Maven存储库。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean install -pl tsfile -am -DskipTests |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如果您具有<strong>未对齐</strong>（例如，并非所有传感器都包含值）的时间序列数据，则可以通过构造**TSRecord **来编写TsFile。</p> <p>可以在以下位置找到更详尽的示例<code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTSRecord.java</code></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">File</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums<span class="token punctuation">.</span></span><span class="token class-name">TSDataType</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums<span class="token punctuation">.</span></span><span class="token class-name">TSEncoding</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span></span><span class="token class-name">TsFileWriter</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span></span><span class="token class-name">TSRecord</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint<span class="token punctuation">.</span></span><span class="token class-name">DataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint<span class="token punctuation">.</span></span><span class="token class-name">FloatDataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint<span class="token punctuation">.</span></span><span class="token class-name">IntDataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>schema<span class="token punctuation">.</span></span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">;</span> |
| <span class="token comment">/** |
| * An example of writing data to TsFile |
| * It uses the interface: |
| * public void addMeasurement(MeasurementSchema MeasurementSchema) throws WriteProcessException |
| */</span> |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileWriteWithTSRecord</span> <span class="token punctuation">{</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span> args<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">"test.tsfile"</span><span class="token punctuation">;</span> |
| <span class="token class-name">File</span> f <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>f<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| f<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token class-name">TsFileWriter</span> tsFileWriter <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileWriter</span><span class="token punctuation">(</span>f<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// add measurements into file schema</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_1"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_2"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_3"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// construct TSRecord</span> |
| <span class="token class-name">TSRecord</span> tsRecord <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TSRecord</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">"device_1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_1"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_2"</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint3 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_3"</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint1<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint2<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint3<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// write TSRecord</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>tsRecord<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// close TsFile</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br></div></div><p>如果您具有<strong>对齐的</strong>时间序列数据，则可以通过构造**RowBatch **来编写TsFile。 |
| 可以在<code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithRowBatch.java</code>中找到更详尽的示例。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">File</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums<span class="token punctuation">.</span></span><span class="token class-name">TSDataType</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums<span class="token punctuation">.</span></span><span class="token class-name">TSEncoding</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span></span><span class="token class-name">TsFileWriter</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>schema<span class="token punctuation">.</span></span><span class="token class-name">Schema</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>schema<span class="token punctuation">.</span></span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span></span><span class="token class-name">RowBatch</span><span class="token punctuation">;</span> |
| <span class="token comment">/** |
| * An example of writing data with RowBatch to TsFile |
| */</span> |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileWriteWithRowBatch</span> <span class="token punctuation">{</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">"test.tsfile"</span><span class="token punctuation">;</span> |
| <span class="token class-name">File</span> f <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>f<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| f<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token class-name">Schema</span> schema <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Schema</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// the number of rows to include in the row batch</span> |
| <span class="token keyword">int</span> rowNum <span class="token operator">=</span> <span class="token number">1000000</span><span class="token punctuation">;</span> |
| <span class="token comment">// the number of values to include in the row batch</span> |
| <span class="token keyword">int</span> sensorNum <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// add measurements into file schema (all with INT64 data type)</span> |
| <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> sensorNum<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| schema<span class="token punctuation">.</span><span class="token function">registerMeasurement</span><span class="token punctuation">(</span> |
| <span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_"</span> <span class="token operator">+</span> <span class="token punctuation">(</span>i <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>TS_2DIFF<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token comment">// add measurements into TSFileWriter</span> |
| <span class="token class-name">TsFileWriter</span> tsFileWriter <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileWriter</span><span class="token punctuation">(</span>f<span class="token punctuation">,</span> schema<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// construct the row batch</span> |
| <span class="token class-name">RowBatch</span> rowBatch <span class="token operator">=</span> schema<span class="token punctuation">.</span><span class="token function">createRowBatch</span><span class="token punctuation">(</span><span class="token string">"device_1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">long</span><span class="token punctuation">[</span><span class="token punctuation">]</span> timestamps <span class="token operator">=</span> rowBatch<span class="token punctuation">.</span>timestamps<span class="token punctuation">;</span> |
| <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> values <span class="token operator">=</span> rowBatch<span class="token punctuation">.</span>values<span class="token punctuation">;</span> |
| |
| <span class="token keyword">long</span> timestamp <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> |
| <span class="token keyword">long</span> value <span class="token operator">=</span> <span class="token number">1000000L</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> r <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> r <span class="token operator"><</span> rowNum<span class="token punctuation">;</span> r<span class="token operator">++</span><span class="token punctuation">,</span> value<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">int</span> row <span class="token operator">=</span> rowBatch<span class="token punctuation">.</span>batchSize<span class="token operator">++</span><span class="token punctuation">;</span> |
| timestamps<span class="token punctuation">[</span>row<span class="token punctuation">]</span> <span class="token operator">=</span> timestamp<span class="token operator">++</span><span class="token punctuation">;</span> |
| <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> sensorNum<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">long</span><span class="token punctuation">[</span><span class="token punctuation">]</span> sensor <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">long</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> values<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span> |
| sensor<span class="token punctuation">[</span>row<span class="token punctuation">]</span> <span class="token operator">=</span> value<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token comment">// write RowBatch to TsFile</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>rowBatch<span class="token punctuation">.</span>batchSize <span class="token operator">==</span> rowBatch<span class="token punctuation">.</span><span class="token function">getMaxBatchSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>rowBatch<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| rowBatch<span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token comment">// write RowBatch to TsFile</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>rowBatch<span class="token punctuation">.</span>batchSize <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>rowBatch<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| rowBatch<span class="token punctuation">.</span><span class="token function">reset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token comment">// close TsFile</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br></div></div><h3 id="读取tsfile的接口"><a href="#读取tsfile的接口" class="header-anchor">#</a> 读取TsFile的接口</h3> <h4 id="开始之前"><a href="#开始之前" class="header-anchor">#</a> 开始之前</h4> <p>“时间序列数据”部分中的时间序列数据集在此用于本节的具体介绍。 下表中显示的集合包含一个名为“ device \ _1”的deltaObject和三个名为“ sensor \ _1”，“ sensor \ _2”和“ sensor \ _3”的测量值。 并简化了测量以进行简单说明，每个仅包含4个时间值对。</p> <table style="text-align:center;"><tr><th colspan="6">device_1</th></tr> <tr><th colspan="2">sensor_1</th><th colspan="2">sensor_2</th><th colspan="2">sensor_3</th></tr> <tr><th>time</th><th>value</th><th>time</th><th>value</th><th>time</th><th>value</th></tr> <tr><td>1</td><td>1.2</td><td>1</td><td>20</td><td>2</td><td>50</td></tr> <tr><td>3</td><td>1.4</td><td>2</td><td>20</td><td>4</td><td>51</td></tr> <tr><td>5</td><td>1.1</td><td>3</td><td>21</td><td>6</td><td>52</td></tr> <tr><td>7</td><td>1.8</td><td>4</td><td>20</td><td>8</td><td>53</td></tr></table> <span>一组时间序列数据</span> <h4 id="路径定义"><a href="#路径定义" class="header-anchor">#</a> 路径定义</h4> <p>路径是用点分隔的字符串，该字符串在TsFile中唯一标识时间序列，例如“ root.area_1.device_1.sensor_1”。 |
| 最后一部分“ sensor_1”称为“ measurementId”，其余部分“ root.area_1.device_1”称为deviceId。 |
| 如上所述，不同设备中的相同测量具有相同的数据类型和编码，并且设备也是唯一的。</p> <p>在读取接口中，参数路径指示要选择的测量。 |
| 通过类<code>Path</code>可以轻松构造<code>Path实</code>例。 例如：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Path p = new Path("device_1.sensor_1"); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们将传递路径的ArrayList进行最终查询，以支持多个路径。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>List<Path> paths = new ArrayList<Path>(); |
| paths.add(new Path("device_1.sensor_1")); |
| paths.add(new Path("device_1.sensor_3")); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><blockquote><p>**注意：**在构造路径时，参数的格式应为点分隔的字符串，最后一部分将被识别为MeasurementId，而其余部分将被识别为deviceId。</p></blockquote> <h4 id="过滤器的定义"><a href="#过滤器的定义" class="header-anchor">#</a> 过滤器的定义</h4> <h5 id="使用场景"><a href="#使用场景" class="header-anchor">#</a> 使用场景</h5> <p>在TsFile读取过程中使用筛选器来选择满足一个或多个给定条件的数据。</p> <h4 id="iexpression"><a href="#iexpression" class="header-anchor">#</a> IExpression</h4> <p><code>IExpression</code>是一个过滤器表达式接口，它将被传递给我们的最终查询调用。 |
| 我们创建一个或多个过滤器表达式，并可以使用二进制过滤器运算符将它们链接到最终表达式。</p> <ul><li><p><strong>创建一个过滤器表达式</strong></p> <p>有两种类型的过滤器。</p> <ul><li><p>TimeFilter：时间序列数据中<code>时间</code>的过滤器。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>使用以下关系获取<code>TimeFilter</code>对象（值是一个long int变量）。 |
| <center><table style="text-align:center;"><tr><th>Relationship</th><th>Description</th></tr> <tr><td>TimeFilter.eq(value)</td><td>Choose the time equal to the value</td></tr> <tr><td>TimeFilter.lt(value)</td><td>Choose the time less than the value</td></tr> <tr><td>TimeFilter.gt(value)</td><td>Choose the time greater than the value</td></tr> <tr><td>TimeFilter.ltEq(value)</td><td>Choose the time less than or equal to the value</td></tr> <tr><td>TimeFilter.gtEq(value)</td><td>Choose the time greater than or equal to the value</td></tr> <tr><td>TimeFilter.notEq(value)</td><td>Choose the time not equal to the value</td></tr> <tr><td>TimeFilter.not(TimeFilter)</td><td>Choose the time not satisfy another TimeFilter</td></tr></table></center></p></li> <li><p>ValueFilter：时间序列数据中值的过滤器。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression valueFilterExpr = new SingleSeriesExpression(Path, ValueFilter); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><code>ValueFilter</code>的用法与<code>TimeFilter</code>的用法相同，只是要确保值的类型等于度量值（在路径中定义）。</p></li></ul></li> <li><p><strong>二元滤波器运算符</strong></p> <p>二进制过滤器运算符可用于链接两个单个表达式。</p> <ul><li>BinaryExpression.and（Expression，Expression）：选择两个表达式都满足的值。</li> <li>BinaryExpression.or（Expression，Expression）：选择至少满足一个表达式的值。</li></ul></li></ul> <h5 id="过滤器表达式示例"><a href="#过滤器表达式示例" class="header-anchor">#</a> 过滤器表达式示例</h5> <ul><li><p><strong>TimeFilterExpression示例</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.eq(15)); // series time = 15 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.ltEq(15)); // series time <= 15 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.lt(15)); // series time < 15 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.gtEq(15)); // series time >= 15 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.notEq(15)); // series time != 15 |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = BinaryExpression.and(new GlobalTimeExpression(TimeFilter.gtEq(15L)), |
| new GlobalTimeExpression(TimeFilter.lt(25L))); // 15 <= series time < 25 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = BinaryExpression.or(new GlobalTimeExpression(TimeFilter.gtEq(15L)), |
| new GlobalTimeExpression(TimeFilter.lt(25L))); // series time >= 15 or series time < 25 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li></ul> <h4 id="读取界面"><a href="#读取界面" class="header-anchor">#</a> 读取界面</h4> <p>首先，我们打开TsFile并从文件路径字符串<code>path</code>获取一个<code>ReadOnlyTsFile</code>实例。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TsFileSequenceReader reader = new TsFileSequenceReader(path); |
| |
| ReadOnlyTsFile readTsFile = new ReadOnlyTsFile(reader); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>接下来，我们准备路径数组和查询表达式，然后通过此接口获取最终的<code>QueryExpression</code>对象：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>QueryExpression queryExpression = QueryExpression.create(paths, statement); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>ReadOnlyTsFile类具有两种查询方法来执行查询。</p> <ul><li><p><strong>方法1</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public QueryDataSet query(QueryExpression queryExpression) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p><strong>方法二</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public QueryDataSet query(QueryExpression queryExpression, long partitionStartOffset, long partitionEndOffset) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>此方法设计用于高级应用程序，例如TsFile-Spark连接器。</p> <ul><li><p><strong>参数</strong> : 对于方法2，添加了两个附加参数以支持部分查询：</p> <ul><li><code>partitionStartOffset</code>: TsFile的起始偏移量</li> <li><code>partitionEndOffset</code>: TsFile的结束偏移量</li></ul> <blockquote><p><strong>什么是部分查询？</strong></p> <p>在某些分布式文件系统（例如HDFS）中，文件被分成几个部分，这些部分称为“块”，并存储在不同的节点中。 在涉及的每个节点中并行执行查询可以提高效率。 因此，需要部分查询。 Paritial Query只选择存储在零件中的结果，该零件由TsFile的<code>QueryConstant.PARTITION_START_OFFSET</code>和<code>QueryConstant.PARTITION_END_OFFSET</code>分开。</p></blockquote></li></ul></li></ul> <h3 id="querydataset接口"><a href="#querydataset接口" class="header-anchor">#</a> QueryDataset接口</h3> <p>上面执行的查询将返回一个<code>QueryDataset</code>对象。</p> <p>这是对用户有用的界面。</p> <ul><li><p><code>bool hasNext();</code></p> <p>如果此数据集仍包含元素，则返回true。</p></li> <li><p><code>List<Path> getPaths()</code></p> <p>获取此数据集中的路径。</p></li> <li><p><code>List<TSDataType> getDataTypes();</code></p> <p>获取数据类型。 TSDataType类是一个枚举类，值将是以下值之一：</p> <div class="language- extra-class"><pre><code> BOOLEAN, |
| INT32, |
| INT64, |
| FLOAT, |
| DOUBLE, |
| TEXT; |
| </code></pre></div></li> <li><p><code>RowRecord next() throws IOException;</code></p> <p>获取下一条记录。</p> <p><code>RowRecord</code>类由一个很长的时间戳和一个<code>List <Field></code>组成，用于不同传感器中的数据，我们可以使用两种getter方法来获取它们。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>long getTimestamp(); |
| List<Field> getFields(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>要从一个字段获取数据，请使用以下方法：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSDataType getDataType(); |
| Object getObjectValue(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li></ul> <h4 id="读取现有tsfile的示例"><a href="#读取现有tsfile的示例" class="header-anchor">#</a> 读取现有TsFile的示例</h4> <p>您应该将TsFile安装到本地Maven存储库。</p> <p>有关查询语句的更详尽示例，请参见： |
| <code>/tsfile/example/src/main/java/org/apache/iotdb/tsfile/TsFileRead.java</code></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">ArrayList</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span></span><span class="token class-name">ReadOnlyTsFile</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span></span><span class="token class-name">TsFileSequenceReader</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>common<span class="token punctuation">.</span></span><span class="token class-name">Path</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span></span><span class="token class-name">IExpression</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span></span><span class="token class-name">QueryExpression</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl<span class="token punctuation">.</span></span><span class="token class-name">BinaryExpression</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl<span class="token punctuation">.</span></span><span class="token class-name">GlobalTimeExpression</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl<span class="token punctuation">.</span></span><span class="token class-name">SingleSeriesExpression</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>filter<span class="token punctuation">.</span></span><span class="token class-name">TimeFilter</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>filter<span class="token punctuation">.</span></span><span class="token class-name">ValueFilter</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>query<span class="token punctuation">.</span>dataset<span class="token punctuation">.</span></span><span class="token class-name">QueryDataSet</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">/** |
| * 该类将显示如何读取名为“ test.ts文件”的Ts文件文件。 |
| * TsFile文件“ test.tsfile”是从类TsFileWrite生成的。 |
| * 运行TsFileWrite首先生成test.tsfile |
| */</span> |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileRead</span> <span class="token punctuation">{</span> |
| <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">queryAndPrint</span><span class="token punctuation">(</span><span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Path</span><span class="token punctuation">></span></span> paths<span class="token punctuation">,</span> <span class="token class-name">ReadOnlyTsFile</span> readTsFile<span class="token punctuation">,</span> <span class="token class-name">IExpression</span> statement<span class="token punctuation">)</span> |
| <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span> |
| <span class="token class-name">QueryExpression</span> queryExpression <span class="token operator">=</span> <span class="token class-name">QueryExpression</span><span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span>paths<span class="token punctuation">,</span> statement<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">QueryDataSet</span> queryDataSet <span class="token operator">=</span> readTsFile<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>queryExpression<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">while</span> <span class="token punctuation">(</span>queryDataSet<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>queryDataSet<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"------------"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span> |
| |
| <span class="token comment">// 文件路径</span> |
| <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">"test.tsfile"</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// 创建阅读器并获取readTsFile接口</span> |
| <span class="token class-name">TsFileSequenceReader</span> reader <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileSequenceReader</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">ReadOnlyTsFile</span> readTsFile <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReadOnlyTsFile</span><span class="token punctuation">(</span>reader<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">// 使用这些路径（所有传感器）进行所有查询</span> |
| <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Path</span><span class="token punctuation">></span></span> paths <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">"device_1.sensor_1"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">"device_1.sensor_2"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">"device_1.sensor_3"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// 没有查询语句</span> |
| <span class="token function">queryAndPrint</span><span class="token punctuation">(</span>paths<span class="token punctuation">,</span> readTsFile<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//离开时关闭阅读器</span> |
| reader<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br></div></div><h2 id="修改-tsfile-配置项"><a href="#修改-tsfile-配置项" class="header-anchor">#</a> 修改 TsFile 配置项</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig config = TSFileDescriptor.getInstance().getConfig(); |
| config.setXXX() |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h2 id="布隆过滤器"><a href="#布隆过滤器" class="header-anchor">#</a> 布隆过滤器</h2> <p>布隆过滤器在加载元数据之前检查给定的时间序列是否在ts文件中。 这样可以提高加载元数据的性能，并跳过不包含指定时间序列的tsfile。 |
| 如果要了解有关其机制的更多信息，可以参考： <a href="https://en.wikipedia.org/wiki/Bloom_filter" target="_blank" rel="noopener noreferrer">wiki page of bloom filter<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>.</p> <h4 id="配置"><a href="#配置" class="header-anchor">#</a> 配置</h4> <p>您可以通过修改 TSFileConfig 里的 bloomFilterErrorRate 参数来控制Bloom过滤器的误报率。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code># The acceptable error rate of bloom filter, should be in [0.01, 0.1], default is 0.05 |
| bloom_filter_error_rate=0.05 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/zh/UserGuide/V0.9.x/4-Client/4-Programming - Other Languages.html" class="prev"> |
| 其他语言 |
| </a></span> <span class="next"><a href="/zh/UserGuide/V0.9.x/5-Operation Manual/1-DDL Data Definition Language.html"> |
| DDL (数据定义语言) |
| </a> |
| → |
| </span></p></div> <p style="text-align: center; color: #909399; font-size: 12px">Copyright © 2021 The Apache Software Foundation.<br> |
| Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p> <p style="text-align: center; margin-top: 10px; color: #909399; font-size: 12px"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p> <p style="text-align: center; margin-top: 10px; color: #909399; font-size: 12px"> |
| We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. |
| </p></main></div><div class="global-ui"></div></div> |
| <script src="/assets/js/app.b493877d.js" defer></script><script src="/assets/js/3.36f2a167.js" defer></script><script src="/assets/js/4.e8b2d372.js" defer></script><script src="/assets/js/633.c6caf1a9.js" defer></script> |
| </body> |
| </html> |
