| <!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"> |
| <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.ccadf850.css" as="style"><link rel="preload" href="/assets/js/app.2be61c67.js" as="script"><link rel="preload" href="/assets/js/3.76c26675.js" as="script"><link rel="preload" href="/assets/js/615.3f880d36.js" as="script"><link rel="prefetch" href="/assets/js/10.77e7d27b.js"><link rel="prefetch" href="/assets/js/100.5978c232.js"><link rel="prefetch" href="/assets/js/101.3c06894e.js"><link rel="prefetch" href="/assets/js/102.7005756d.js"><link rel="prefetch" href="/assets/js/103.911b070f.js"><link rel="prefetch" href="/assets/js/104.c42705fc.js"><link rel="prefetch" href="/assets/js/105.fc24900a.js"><link rel="prefetch" href="/assets/js/106.e2c7a612.js"><link rel="prefetch" href="/assets/js/107.1a274d23.js"><link rel="prefetch" href="/assets/js/108.f4b2f266.js"><link rel="prefetch" href="/assets/js/109.0dfdb183.js"><link rel="prefetch" href="/assets/js/11.c977ea47.js"><link rel="prefetch" href="/assets/js/110.c0cf66fd.js"><link rel="prefetch" href="/assets/js/111.ac7da683.js"><link rel="prefetch" href="/assets/js/112.fab622d7.js"><link rel="prefetch" href="/assets/js/113.8814f02a.js"><link rel="prefetch" href="/assets/js/114.1551f368.js"><link rel="prefetch" href="/assets/js/115.10ab0fa6.js"><link rel="prefetch" href="/assets/js/116.24d8e3ae.js"><link rel="prefetch" href="/assets/js/117.62b77e48.js"><link rel="prefetch" href="/assets/js/118.b5f4285f.js"><link rel="prefetch" href="/assets/js/119.289b64a7.js"><link rel="prefetch" href="/assets/js/12.643b0fb0.js"><link rel="prefetch" href="/assets/js/120.a3a7d6a6.js"><link rel="prefetch" href="/assets/js/121.5515c0ec.js"><link rel="prefetch" href="/assets/js/122.35cc367c.js"><link rel="prefetch" href="/assets/js/123.8060bcba.js"><link rel="prefetch" href="/assets/js/124.a437724f.js"><link rel="prefetch" href="/assets/js/125.7e0ae3d5.js"><link rel="prefetch" href="/assets/js/126.dfa5e587.js"><link rel="prefetch" href="/assets/js/127.82d22059.js"><link rel="prefetch" href="/assets/js/128.71d68503.js"><link rel="prefetch" href="/assets/js/129.b1d7b4ee.js"><link rel="prefetch" href="/assets/js/13.a4d58a0e.js"><link rel="prefetch" href="/assets/js/130.0e44556c.js"><link rel="prefetch" href="/assets/js/131.f49b82ba.js"><link rel="prefetch" href="/assets/js/132.2305a855.js"><link rel="prefetch" href="/assets/js/133.f2e444f9.js"><link rel="prefetch" href="/assets/js/134.8ce7ebe8.js"><link rel="prefetch" href="/assets/js/135.1c822c60.js"><link rel="prefetch" href="/assets/js/136.a3f695f3.js"><link rel="prefetch" href="/assets/js/137.14d95caa.js"><link rel="prefetch" href="/assets/js/138.d88ea14c.js"><link rel="prefetch" href="/assets/js/139.66718d11.js"><link rel="prefetch" href="/assets/js/14.4a4bedae.js"><link rel="prefetch" href="/assets/js/140.e38061b3.js"><link rel="prefetch" href="/assets/js/141.2acb2a1b.js"><link rel="prefetch" href="/assets/js/142.69da0d10.js"><link rel="prefetch" href="/assets/js/143.04577d6e.js"><link rel="prefetch" href="/assets/js/144.ccfd152f.js"><link rel="prefetch" href="/assets/js/145.834006ea.js"><link rel="prefetch" href="/assets/js/146.8a105652.js"><link rel="prefetch" href="/assets/js/147.c57e74c9.js"><link rel="prefetch" href="/assets/js/148.e749901c.js"><link rel="prefetch" href="/assets/js/149.c09d3abb.js"><link rel="prefetch" href="/assets/js/15.43bf9dc7.js"><link rel="prefetch" href="/assets/js/150.0cff15e0.js"><link rel="prefetch" href="/assets/js/151.13f45c22.js"><link rel="prefetch" href="/assets/js/152.cbece8f6.js"><link rel="prefetch" href="/assets/js/153.5fdc9dde.js"><link rel="prefetch" href="/assets/js/154.0b8e5442.js"><link rel="prefetch" href="/assets/js/155.b86990ed.js"><link rel="prefetch" href="/assets/js/156.eceb5d96.js"><link rel="prefetch" href="/assets/js/157.d1c61837.js"><link rel="prefetch" href="/assets/js/158.a06eb3ba.js"><link rel="prefetch" href="/assets/js/159.77ebe8da.js"><link rel="prefetch" href="/assets/js/16.8d99ed47.js"><link rel="prefetch" href="/assets/js/160.7dbd6018.js"><link rel="prefetch" href="/assets/js/161.b34e422b.js"><link rel="prefetch" href="/assets/js/162.650373ef.js"><link rel="prefetch" href="/assets/js/163.b75be02c.js"><link rel="prefetch" href="/assets/js/164.7b779ce2.js"><link rel="prefetch" href="/assets/js/165.dde20342.js"><link rel="prefetch" href="/assets/js/166.bdf54e36.js"><link rel="prefetch" href="/assets/js/167.e610df20.js"><link rel="prefetch" href="/assets/js/168.da12f653.js"><link rel="prefetch" href="/assets/js/169.a17b51a5.js"><link rel="prefetch" href="/assets/js/17.efe29df6.js"><link rel="prefetch" href="/assets/js/170.98aecdb5.js"><link rel="prefetch" href="/assets/js/171.38f40a14.js"><link rel="prefetch" href="/assets/js/172.568115a6.js"><link rel="prefetch" href="/assets/js/173.05d1b7cd.js"><link rel="prefetch" href="/assets/js/174.89bb943f.js"><link rel="prefetch" href="/assets/js/175.a15325e0.js"><link rel="prefetch" href="/assets/js/176.957205a1.js"><link rel="prefetch" href="/assets/js/177.342fa158.js"><link rel="prefetch" href="/assets/js/178.b1970e95.js"><link rel="prefetch" href="/assets/js/179.f20c8fcf.js"><link rel="prefetch" href="/assets/js/18.07265d0f.js"><link rel="prefetch" href="/assets/js/180.0b055cea.js"><link rel="prefetch" href="/assets/js/181.5463f34c.js"><link rel="prefetch" href="/assets/js/182.3f957446.js"><link rel="prefetch" href="/assets/js/183.9c026044.js"><link rel="prefetch" href="/assets/js/184.fb7c5cbf.js"><link rel="prefetch" href="/assets/js/185.5702ac62.js"><link rel="prefetch" href="/assets/js/186.9e7facfb.js"><link rel="prefetch" href="/assets/js/187.10d06549.js"><link rel="prefetch" href="/assets/js/188.163ae726.js"><link rel="prefetch" href="/assets/js/189.387099b2.js"><link rel="prefetch" href="/assets/js/19.e46591ce.js"><link rel="prefetch" href="/assets/js/190.a737b6d5.js"><link rel="prefetch" href="/assets/js/191.29303307.js"><link rel="prefetch" href="/assets/js/192.649843f1.js"><link rel="prefetch" href="/assets/js/193.b3388900.js"><link rel="prefetch" href="/assets/js/194.c69dc82e.js"><link rel="prefetch" href="/assets/js/195.5cfd6276.js"><link rel="prefetch" href="/assets/js/196.c0789301.js"><link rel="prefetch" href="/assets/js/197.24839fe1.js"><link rel="prefetch" href="/assets/js/198.32230f09.js"><link rel="prefetch" href="/assets/js/199.4649568f.js"><link rel="prefetch" href="/assets/js/20.cf088c3b.js"><link rel="prefetch" href="/assets/js/200.ecdc68bb.js"><link rel="prefetch" href="/assets/js/201.1adf86e1.js"><link rel="prefetch" href="/assets/js/202.354be9bb.js"><link rel="prefetch" href="/assets/js/203.91db71eb.js"><link rel="prefetch" href="/assets/js/204.c4fd1e7a.js"><link rel="prefetch" href="/assets/js/205.95368a99.js"><link rel="prefetch" href="/assets/js/206.83298a02.js"><link rel="prefetch" href="/assets/js/207.966b1c38.js"><link rel="prefetch" href="/assets/js/208.0f10808e.js"><link rel="prefetch" href="/assets/js/209.94083b01.js"><link rel="prefetch" href="/assets/js/21.7c4456b0.js"><link rel="prefetch" href="/assets/js/210.c73194ab.js"><link rel="prefetch" href="/assets/js/211.98653326.js"><link rel="prefetch" href="/assets/js/212.0bd8e759.js"><link rel="prefetch" href="/assets/js/213.50bedb05.js"><link rel="prefetch" href="/assets/js/214.388414b0.js"><link rel="prefetch" href="/assets/js/215.4ec26cc5.js"><link rel="prefetch" href="/assets/js/216.4daf4a2f.js"><link rel="prefetch" href="/assets/js/217.1db92b77.js"><link rel="prefetch" href="/assets/js/218.8c7c0ed3.js"><link rel="prefetch" href="/assets/js/219.071386e7.js"><link rel="prefetch" href="/assets/js/22.0d791f94.js"><link rel="prefetch" href="/assets/js/220.54ee8906.js"><link rel="prefetch" href="/assets/js/221.128f6cb4.js"><link rel="prefetch" href="/assets/js/222.37ce006e.js"><link rel="prefetch" href="/assets/js/223.a15a2f53.js"><link rel="prefetch" href="/assets/js/224.a9e8d08f.js"><link rel="prefetch" href="/assets/js/225.d4eee9f5.js"><link rel="prefetch" href="/assets/js/226.997ca0c2.js"><link rel="prefetch" href="/assets/js/227.741bef94.js"><link rel="prefetch" href="/assets/js/228.c3f1556b.js"><link rel="prefetch" href="/assets/js/229.1cd8821a.js"><link rel="prefetch" href="/assets/js/23.a479be57.js"><link rel="prefetch" href="/assets/js/230.ba6bcaf2.js"><link rel="prefetch" href="/assets/js/231.18bef6d1.js"><link rel="prefetch" href="/assets/js/232.083067e0.js"><link rel="prefetch" href="/assets/js/233.a690d5ae.js"><link rel="prefetch" href="/assets/js/234.01fe6899.js"><link rel="prefetch" href="/assets/js/235.eb70513e.js"><link rel="prefetch" href="/assets/js/236.5a9113d6.js"><link rel="prefetch" href="/assets/js/237.99203a50.js"><link rel="prefetch" href="/assets/js/238.f90f1f07.js"><link rel="prefetch" href="/assets/js/239.f0bcd461.js"><link rel="prefetch" href="/assets/js/24.de37758e.js"><link rel="prefetch" href="/assets/js/240.2a401737.js"><link rel="prefetch" href="/assets/js/241.5858d35e.js"><link rel="prefetch" href="/assets/js/242.b260464e.js"><link rel="prefetch" href="/assets/js/243.96540218.js"><link rel="prefetch" href="/assets/js/244.c47dc56c.js"><link rel="prefetch" href="/assets/js/245.3852d8dd.js"><link rel="prefetch" href="/assets/js/246.f6d16cb9.js"><link rel="prefetch" href="/assets/js/247.039d13fd.js"><link rel="prefetch" href="/assets/js/248.9536ebc1.js"><link rel="prefetch" href="/assets/js/249.0e58249a.js"><link rel="prefetch" href="/assets/js/25.77e4633a.js"><link rel="prefetch" href="/assets/js/250.dfcb233f.js"><link rel="prefetch" href="/assets/js/251.40e9e79a.js"><link rel="prefetch" href="/assets/js/252.ff6ab14e.js"><link rel="prefetch" href="/assets/js/253.9c2ec16e.js"><link rel="prefetch" href="/assets/js/254.df494a1c.js"><link rel="prefetch" href="/assets/js/255.cfab9f22.js"><link rel="prefetch" href="/assets/js/256.3f62947f.js"><link rel="prefetch" href="/assets/js/257.4a4b953b.js"><link rel="prefetch" href="/assets/js/258.9da81847.js"><link rel="prefetch" href="/assets/js/259.9a890b58.js"><link rel="prefetch" href="/assets/js/26.bc913725.js"><link rel="prefetch" href="/assets/js/260.25059a8b.js"><link rel="prefetch" href="/assets/js/261.b46c4c45.js"><link rel="prefetch" href="/assets/js/262.a7c40553.js"><link rel="prefetch" href="/assets/js/263.6bf75f17.js"><link rel="prefetch" href="/assets/js/264.8d95fd19.js"><link rel="prefetch" href="/assets/js/265.70d8d0d0.js"><link rel="prefetch" href="/assets/js/266.6f7c78a6.js"><link rel="prefetch" href="/assets/js/267.3a11b8f6.js"><link rel="prefetch" href="/assets/js/268.53499932.js"><link rel="prefetch" href="/assets/js/269.a1b4a38e.js"><link rel="prefetch" href="/assets/js/27.ce2cad14.js"><link rel="prefetch" href="/assets/js/270.0ff1ebdc.js"><link rel="prefetch" href="/assets/js/271.5cda34f0.js"><link rel="prefetch" href="/assets/js/272.357c1eee.js"><link rel="prefetch" href="/assets/js/273.db93948e.js"><link rel="prefetch" href="/assets/js/274.2c8e7fe4.js"><link rel="prefetch" href="/assets/js/275.8a6fbd0d.js"><link rel="prefetch" href="/assets/js/276.34f2423f.js"><link rel="prefetch" href="/assets/js/277.19f66113.js"><link rel="prefetch" href="/assets/js/278.88fc788e.js"><link rel="prefetch" href="/assets/js/279.1c91a92e.js"><link rel="prefetch" href="/assets/js/28.196d9118.js"><link rel="prefetch" href="/assets/js/280.0d760d52.js"><link rel="prefetch" href="/assets/js/281.f7f5aa4d.js"><link rel="prefetch" href="/assets/js/282.7e6328e3.js"><link rel="prefetch" href="/assets/js/283.0232ecfb.js"><link rel="prefetch" href="/assets/js/284.9c6d661e.js"><link rel="prefetch" href="/assets/js/285.4efd3863.js"><link rel="prefetch" href="/assets/js/286.a7cf806d.js"><link rel="prefetch" href="/assets/js/287.cad93c83.js"><link rel="prefetch" href="/assets/js/288.2cdaca3b.js"><link rel="prefetch" href="/assets/js/289.8f217264.js"><link rel="prefetch" href="/assets/js/29.91dc2824.js"><link rel="prefetch" href="/assets/js/290.dafc66d9.js"><link rel="prefetch" href="/assets/js/291.22a9e6bd.js"><link rel="prefetch" href="/assets/js/292.deeefef9.js"><link rel="prefetch" href="/assets/js/293.b7fa5dd0.js"><link rel="prefetch" href="/assets/js/294.884ba36d.js"><link rel="prefetch" href="/assets/js/295.0f7d1349.js"><link rel="prefetch" href="/assets/js/296.b41c6aaf.js"><link rel="prefetch" href="/assets/js/297.cb35a816.js"><link rel="prefetch" href="/assets/js/298.10f5b520.js"><link rel="prefetch" href="/assets/js/299.ba763072.js"><link rel="prefetch" href="/assets/js/30.60649b66.js"><link rel="prefetch" href="/assets/js/300.503d67a6.js"><link rel="prefetch" href="/assets/js/301.bd8b07a8.js"><link rel="prefetch" href="/assets/js/302.d34579a2.js"><link rel="prefetch" href="/assets/js/303.75b9c998.js"><link rel="prefetch" href="/assets/js/304.a0d9bd1e.js"><link rel="prefetch" href="/assets/js/305.b920fdf6.js"><link rel="prefetch" href="/assets/js/306.103f06d3.js"><link rel="prefetch" href="/assets/js/307.5cd94467.js"><link rel="prefetch" href="/assets/js/308.551b2e96.js"><link rel="prefetch" href="/assets/js/309.6c393e75.js"><link rel="prefetch" href="/assets/js/31.fab44020.js"><link rel="prefetch" href="/assets/js/310.13d1174d.js"><link rel="prefetch" href="/assets/js/311.6390b351.js"><link rel="prefetch" href="/assets/js/312.e4441d29.js"><link rel="prefetch" href="/assets/js/313.5045008e.js"><link rel="prefetch" href="/assets/js/314.d02b9a2a.js"><link rel="prefetch" href="/assets/js/315.f9c85cb2.js"><link rel="prefetch" href="/assets/js/316.f277f043.js"><link rel="prefetch" href="/assets/js/317.ec54a9fa.js"><link rel="prefetch" href="/assets/js/318.a17c5fdc.js"><link rel="prefetch" href="/assets/js/319.18a9e9ec.js"><link rel="prefetch" href="/assets/js/32.e5e702b0.js"><link rel="prefetch" href="/assets/js/320.c8af7744.js"><link rel="prefetch" href="/assets/js/321.fd9f73db.js"><link rel="prefetch" href="/assets/js/322.a5716fc9.js"><link rel="prefetch" href="/assets/js/323.f8103e09.js"><link rel="prefetch" href="/assets/js/324.6a332a88.js"><link rel="prefetch" href="/assets/js/325.0cbe8f4f.js"><link rel="prefetch" href="/assets/js/326.93fceca1.js"><link rel="prefetch" href="/assets/js/327.9ce809fe.js"><link rel="prefetch" href="/assets/js/328.fca2d6a0.js"><link rel="prefetch" href="/assets/js/329.1282a9c1.js"><link rel="prefetch" href="/assets/js/33.b678d537.js"><link rel="prefetch" href="/assets/js/330.13adf005.js"><link rel="prefetch" href="/assets/js/331.d6d115cc.js"><link rel="prefetch" href="/assets/js/332.d32d6427.js"><link rel="prefetch" href="/assets/js/333.de101422.js"><link rel="prefetch" href="/assets/js/334.e87a7cc5.js"><link rel="prefetch" href="/assets/js/335.c6847516.js"><link rel="prefetch" href="/assets/js/336.f6fed1c6.js"><link rel="prefetch" href="/assets/js/337.37ed96cd.js"><link rel="prefetch" href="/assets/js/338.2d943262.js"><link rel="prefetch" href="/assets/js/339.3443bd0c.js"><link rel="prefetch" href="/assets/js/34.7b065e16.js"><link rel="prefetch" href="/assets/js/340.1b05c70f.js"><link rel="prefetch" href="/assets/js/341.bf0f9508.js"><link rel="prefetch" href="/assets/js/342.3fbdaee0.js"><link rel="prefetch" href="/assets/js/343.630a495e.js"><link rel="prefetch" href="/assets/js/344.a234a73f.js"><link rel="prefetch" href="/assets/js/345.b2ce2372.js"><link rel="prefetch" href="/assets/js/346.bfc24599.js"><link rel="prefetch" href="/assets/js/347.25473fe5.js"><link rel="prefetch" href="/assets/js/348.f01ca0ff.js"><link rel="prefetch" href="/assets/js/349.e8ff6c21.js"><link rel="prefetch" href="/assets/js/35.79f48bad.js"><link rel="prefetch" href="/assets/js/350.64aa3024.js"><link rel="prefetch" href="/assets/js/351.616b18a1.js"><link rel="prefetch" href="/assets/js/352.527b817a.js"><link rel="prefetch" href="/assets/js/353.fc4255eb.js"><link rel="prefetch" href="/assets/js/354.28952833.js"><link rel="prefetch" href="/assets/js/355.b20b5864.js"><link rel="prefetch" href="/assets/js/356.eb081931.js"><link rel="prefetch" href="/assets/js/357.daea00ab.js"><link rel="prefetch" href="/assets/js/358.7de0afb3.js"><link rel="prefetch" href="/assets/js/359.a722d835.js"><link rel="prefetch" href="/assets/js/36.4e36f97e.js"><link rel="prefetch" href="/assets/js/360.cc3f9eff.js"><link rel="prefetch" href="/assets/js/361.957b907a.js"><link rel="prefetch" href="/assets/js/362.05464ead.js"><link rel="prefetch" href="/assets/js/363.dcc13548.js"><link rel="prefetch" href="/assets/js/364.2c2529a1.js"><link rel="prefetch" href="/assets/js/365.ccde8473.js"><link rel="prefetch" href="/assets/js/366.bbf0ce04.js"><link rel="prefetch" href="/assets/js/367.c5aafff8.js"><link rel="prefetch" href="/assets/js/368.7d23c4e6.js"><link rel="prefetch" href="/assets/js/369.0f424e1d.js"><link rel="prefetch" href="/assets/js/37.33185238.js"><link rel="prefetch" href="/assets/js/370.e98b0418.js"><link rel="prefetch" href="/assets/js/371.6eb4cf9f.js"><link rel="prefetch" href="/assets/js/372.2141c416.js"><link rel="prefetch" href="/assets/js/373.25685ada.js"><link rel="prefetch" href="/assets/js/374.3ce6d66c.js"><link rel="prefetch" href="/assets/js/375.dc904417.js"><link rel="prefetch" href="/assets/js/376.fde1e3d3.js"><link rel="prefetch" href="/assets/js/377.a1d2f194.js"><link rel="prefetch" href="/assets/js/378.88128618.js"><link rel="prefetch" href="/assets/js/379.a5d1aca5.js"><link rel="prefetch" href="/assets/js/38.b02b6af6.js"><link rel="prefetch" href="/assets/js/380.e9a0a3e4.js"><link rel="prefetch" href="/assets/js/381.cbc420d0.js"><link rel="prefetch" href="/assets/js/382.27942c5e.js"><link rel="prefetch" href="/assets/js/383.2042e12b.js"><link rel="prefetch" href="/assets/js/384.69f48d6e.js"><link rel="prefetch" href="/assets/js/385.450c0692.js"><link rel="prefetch" href="/assets/js/386.d1bb1e30.js"><link rel="prefetch" href="/assets/js/387.cd639bfa.js"><link rel="prefetch" href="/assets/js/388.4690fa6f.js"><link rel="prefetch" href="/assets/js/389.c3ad621a.js"><link rel="prefetch" href="/assets/js/39.2861d4e5.js"><link rel="prefetch" href="/assets/js/390.cd84bb90.js"><link rel="prefetch" href="/assets/js/391.cdb6768a.js"><link rel="prefetch" href="/assets/js/392.3304f571.js"><link rel="prefetch" href="/assets/js/393.a91e77e8.js"><link rel="prefetch" href="/assets/js/394.f99051fd.js"><link rel="prefetch" href="/assets/js/395.9c2f85cb.js"><link rel="prefetch" href="/assets/js/396.734c3f15.js"><link rel="prefetch" href="/assets/js/397.eb3cb411.js"><link rel="prefetch" href="/assets/js/398.21324d16.js"><link rel="prefetch" href="/assets/js/399.e5613041.js"><link rel="prefetch" href="/assets/js/4.860a5721.js"><link rel="prefetch" href="/assets/js/40.6f6fb483.js"><link rel="prefetch" href="/assets/js/400.f37f241a.js"><link rel="prefetch" href="/assets/js/401.6c60fdd3.js"><link rel="prefetch" href="/assets/js/402.b4ef1603.js"><link rel="prefetch" href="/assets/js/403.264594b0.js"><link rel="prefetch" href="/assets/js/404.b09fba9e.js"><link rel="prefetch" href="/assets/js/405.80826ea1.js"><link rel="prefetch" href="/assets/js/406.73631b7f.js"><link rel="prefetch" href="/assets/js/407.5acbdf9e.js"><link rel="prefetch" href="/assets/js/408.67447621.js"><link rel="prefetch" href="/assets/js/409.4d398928.js"><link rel="prefetch" href="/assets/js/41.54dfae4f.js"><link rel="prefetch" href="/assets/js/410.cd6ef2d8.js"><link rel="prefetch" href="/assets/js/411.1cc06de8.js"><link rel="prefetch" href="/assets/js/412.bbf05dd5.js"><link rel="prefetch" href="/assets/js/413.b8bb4544.js"><link rel="prefetch" href="/assets/js/414.92349085.js"><link rel="prefetch" href="/assets/js/415.989628a8.js"><link rel="prefetch" href="/assets/js/416.c371deaf.js"><link rel="prefetch" href="/assets/js/417.28c30f8d.js"><link rel="prefetch" href="/assets/js/418.5d9468fc.js"><link rel="prefetch" href="/assets/js/419.fe0c2dcb.js"><link rel="prefetch" href="/assets/js/42.634cb345.js"><link rel="prefetch" href="/assets/js/420.35071d8d.js"><link rel="prefetch" href="/assets/js/421.c7405cb6.js"><link rel="prefetch" href="/assets/js/422.1994ad42.js"><link rel="prefetch" href="/assets/js/423.a26dc674.js"><link rel="prefetch" href="/assets/js/424.27381d5f.js"><link rel="prefetch" href="/assets/js/425.f2994924.js"><link rel="prefetch" href="/assets/js/426.acf56e67.js"><link rel="prefetch" href="/assets/js/427.d4736e32.js"><link rel="prefetch" href="/assets/js/428.bbd6f000.js"><link rel="prefetch" href="/assets/js/429.33d076f9.js"><link rel="prefetch" href="/assets/js/43.3fff5a4c.js"><link rel="prefetch" href="/assets/js/430.28361236.js"><link rel="prefetch" href="/assets/js/431.b20e093d.js"><link rel="prefetch" href="/assets/js/432.1c754e22.js"><link rel="prefetch" href="/assets/js/433.c0edf7c8.js"><link rel="prefetch" href="/assets/js/434.2bd857ef.js"><link rel="prefetch" href="/assets/js/435.11eb586d.js"><link rel="prefetch" href="/assets/js/436.f86ee01e.js"><link rel="prefetch" href="/assets/js/437.62cf3d26.js"><link rel="prefetch" href="/assets/js/438.d9dc7073.js"><link rel="prefetch" href="/assets/js/439.d36e71dd.js"><link rel="prefetch" href="/assets/js/44.048e5262.js"><link rel="prefetch" href="/assets/js/440.61cf1b86.js"><link rel="prefetch" href="/assets/js/441.0ae13653.js"><link rel="prefetch" href="/assets/js/442.8d0ee2a8.js"><link rel="prefetch" href="/assets/js/443.225d3dbb.js"><link rel="prefetch" href="/assets/js/444.626271de.js"><link rel="prefetch" href="/assets/js/445.2272a7fc.js"><link rel="prefetch" href="/assets/js/446.91a57cb6.js"><link rel="prefetch" href="/assets/js/447.222ebc6a.js"><link rel="prefetch" href="/assets/js/448.868cf1f8.js"><link rel="prefetch" href="/assets/js/449.b093edb6.js"><link rel="prefetch" href="/assets/js/45.3161e71b.js"><link rel="prefetch" href="/assets/js/450.c074c9a4.js"><link rel="prefetch" href="/assets/js/451.f6f35b11.js"><link rel="prefetch" href="/assets/js/452.7e778ff7.js"><link rel="prefetch" href="/assets/js/453.67b59c96.js"><link rel="prefetch" href="/assets/js/454.b5ed7647.js"><link rel="prefetch" href="/assets/js/455.55045395.js"><link rel="prefetch" href="/assets/js/456.249f166b.js"><link rel="prefetch" href="/assets/js/457.ac8fcf0d.js"><link rel="prefetch" href="/assets/js/458.fff99426.js"><link rel="prefetch" href="/assets/js/459.8f32e619.js"><link rel="prefetch" href="/assets/js/46.520cacec.js"><link rel="prefetch" href="/assets/js/460.7447567b.js"><link rel="prefetch" href="/assets/js/461.6178bddb.js"><link rel="prefetch" href="/assets/js/462.f60696a1.js"><link rel="prefetch" href="/assets/js/463.309f8ecc.js"><link rel="prefetch" href="/assets/js/464.35bb2621.js"><link rel="prefetch" href="/assets/js/465.3e82a4cf.js"><link rel="prefetch" href="/assets/js/466.337260a9.js"><link rel="prefetch" href="/assets/js/467.24d42d9b.js"><link rel="prefetch" href="/assets/js/468.2cc44636.js"><link rel="prefetch" href="/assets/js/469.9d75c005.js"><link rel="prefetch" href="/assets/js/47.a8742825.js"><link rel="prefetch" href="/assets/js/470.1a3ca4a6.js"><link rel="prefetch" href="/assets/js/471.745c8bf2.js"><link rel="prefetch" href="/assets/js/472.c857fa3d.js"><link rel="prefetch" href="/assets/js/473.036c7be4.js"><link rel="prefetch" href="/assets/js/474.29cdec0b.js"><link rel="prefetch" href="/assets/js/475.2fe78431.js"><link rel="prefetch" href="/assets/js/476.2b7ce637.js"><link rel="prefetch" href="/assets/js/477.e489e2d7.js"><link rel="prefetch" href="/assets/js/478.28446bd6.js"><link rel="prefetch" href="/assets/js/479.aca7b0ce.js"><link rel="prefetch" href="/assets/js/48.ad2c2a29.js"><link rel="prefetch" href="/assets/js/480.c2ed2c9b.js"><link rel="prefetch" href="/assets/js/481.604be7ca.js"><link rel="prefetch" href="/assets/js/482.e0217f30.js"><link rel="prefetch" href="/assets/js/483.cdda9e85.js"><link rel="prefetch" href="/assets/js/484.10f2fb22.js"><link rel="prefetch" href="/assets/js/485.2295bfa7.js"><link rel="prefetch" href="/assets/js/486.e561507a.js"><link rel="prefetch" href="/assets/js/487.06cca38a.js"><link rel="prefetch" href="/assets/js/488.2169a5df.js"><link rel="prefetch" href="/assets/js/489.8ef30aea.js"><link rel="prefetch" href="/assets/js/49.a22d6593.js"><link rel="prefetch" href="/assets/js/490.a6e9f99d.js"><link rel="prefetch" href="/assets/js/491.e078ec7a.js"><link rel="prefetch" href="/assets/js/492.ecd04f27.js"><link rel="prefetch" href="/assets/js/493.a35cbc4b.js"><link rel="prefetch" href="/assets/js/494.d66239f8.js"><link rel="prefetch" href="/assets/js/495.a389c93a.js"><link rel="prefetch" href="/assets/js/496.818b7047.js"><link rel="prefetch" href="/assets/js/497.cb70ba2c.js"><link rel="prefetch" href="/assets/js/498.f81d35f6.js"><link rel="prefetch" href="/assets/js/499.39ec261c.js"><link rel="prefetch" href="/assets/js/5.2a4451ec.js"><link rel="prefetch" href="/assets/js/50.abf20f4e.js"><link rel="prefetch" href="/assets/js/500.8a883e28.js"><link rel="prefetch" href="/assets/js/501.210aa35e.js"><link rel="prefetch" href="/assets/js/502.0a3d947f.js"><link rel="prefetch" href="/assets/js/503.d1e67738.js"><link rel="prefetch" href="/assets/js/504.f30f9c70.js"><link rel="prefetch" href="/assets/js/505.feadbbe8.js"><link rel="prefetch" href="/assets/js/506.67ce6593.js"><link rel="prefetch" href="/assets/js/507.6161dd8b.js"><link rel="prefetch" href="/assets/js/508.164ed528.js"><link rel="prefetch" href="/assets/js/509.39243cfc.js"><link rel="prefetch" href="/assets/js/51.65940de1.js"><link rel="prefetch" href="/assets/js/510.fc047f5d.js"><link rel="prefetch" href="/assets/js/511.dc5e0cf8.js"><link rel="prefetch" href="/assets/js/512.9accfd9f.js"><link rel="prefetch" href="/assets/js/513.77fdc498.js"><link rel="prefetch" href="/assets/js/514.7516bfbb.js"><link rel="prefetch" href="/assets/js/515.ec7ac327.js"><link rel="prefetch" href="/assets/js/516.7cafda3f.js"><link rel="prefetch" href="/assets/js/517.8afd51dc.js"><link rel="prefetch" href="/assets/js/518.ff7c1632.js"><link rel="prefetch" href="/assets/js/519.a1af4eb5.js"><link rel="prefetch" href="/assets/js/52.10d8a15b.js"><link rel="prefetch" href="/assets/js/520.5bd3028e.js"><link rel="prefetch" href="/assets/js/521.ff064e49.js"><link rel="prefetch" href="/assets/js/522.b53bbb3b.js"><link rel="prefetch" href="/assets/js/523.65fdc05c.js"><link rel="prefetch" href="/assets/js/524.9227e482.js"><link rel="prefetch" href="/assets/js/525.1c5a16f9.js"><link rel="prefetch" href="/assets/js/526.ba58a6d9.js"><link rel="prefetch" href="/assets/js/527.b8cafc93.js"><link rel="prefetch" href="/assets/js/528.19bf3e90.js"><link rel="prefetch" href="/assets/js/529.5e69e74b.js"><link rel="prefetch" href="/assets/js/53.41dd4d57.js"><link rel="prefetch" href="/assets/js/530.6f09a805.js"><link rel="prefetch" href="/assets/js/531.f418e38a.js"><link rel="prefetch" href="/assets/js/532.5b4a65b8.js"><link rel="prefetch" href="/assets/js/533.8de3ac38.js"><link rel="prefetch" href="/assets/js/534.7ee1d41c.js"><link rel="prefetch" href="/assets/js/535.e44544a1.js"><link rel="prefetch" href="/assets/js/536.29b5aa38.js"><link rel="prefetch" href="/assets/js/537.d880085c.js"><link rel="prefetch" href="/assets/js/538.fd8739e4.js"><link rel="prefetch" href="/assets/js/539.5ea286ba.js"><link rel="prefetch" href="/assets/js/54.2bd5a2fe.js"><link rel="prefetch" href="/assets/js/540.9157430c.js"><link rel="prefetch" href="/assets/js/541.d020594e.js"><link rel="prefetch" href="/assets/js/542.9569e347.js"><link rel="prefetch" href="/assets/js/543.d11b2a46.js"><link rel="prefetch" href="/assets/js/544.f394480d.js"><link rel="prefetch" href="/assets/js/545.0df80452.js"><link rel="prefetch" href="/assets/js/546.3a77b244.js"><link rel="prefetch" href="/assets/js/547.73300ff7.js"><link rel="prefetch" href="/assets/js/548.e5e54634.js"><link rel="prefetch" href="/assets/js/549.79c75623.js"><link rel="prefetch" href="/assets/js/55.a34d087b.js"><link rel="prefetch" href="/assets/js/550.6a5a01ca.js"><link rel="prefetch" href="/assets/js/551.2ab6cbb6.js"><link rel="prefetch" href="/assets/js/552.a523c03a.js"><link rel="prefetch" href="/assets/js/553.1e63e087.js"><link rel="prefetch" href="/assets/js/554.9079ff78.js"><link rel="prefetch" href="/assets/js/555.76e63349.js"><link rel="prefetch" href="/assets/js/556.69ade81b.js"><link rel="prefetch" href="/assets/js/557.837960af.js"><link rel="prefetch" href="/assets/js/558.27600996.js"><link rel="prefetch" href="/assets/js/559.51850cf1.js"><link rel="prefetch" href="/assets/js/56.a777e897.js"><link rel="prefetch" href="/assets/js/560.ab9ce7f9.js"><link rel="prefetch" href="/assets/js/561.9c4674ce.js"><link rel="prefetch" href="/assets/js/562.bcbfdf06.js"><link rel="prefetch" href="/assets/js/563.30537cf9.js"><link rel="prefetch" href="/assets/js/564.f56ad01f.js"><link rel="prefetch" href="/assets/js/565.8d8c028e.js"><link rel="prefetch" href="/assets/js/566.fd34dd08.js"><link rel="prefetch" href="/assets/js/567.ec6cc4fb.js"><link rel="prefetch" href="/assets/js/568.cd5b6590.js"><link rel="prefetch" href="/assets/js/569.16f9ec30.js"><link rel="prefetch" href="/assets/js/57.d5881d85.js"><link rel="prefetch" href="/assets/js/570.0674fef1.js"><link rel="prefetch" href="/assets/js/571.57d5e690.js"><link rel="prefetch" href="/assets/js/572.8c9e0a9e.js"><link rel="prefetch" href="/assets/js/573.a34f1c58.js"><link rel="prefetch" href="/assets/js/574.979d6170.js"><link rel="prefetch" href="/assets/js/575.d413f4e9.js"><link rel="prefetch" href="/assets/js/576.074b1d78.js"><link rel="prefetch" href="/assets/js/577.94e95ba8.js"><link rel="prefetch" href="/assets/js/578.7d3112d5.js"><link rel="prefetch" href="/assets/js/579.90f3005d.js"><link rel="prefetch" href="/assets/js/58.449bd56c.js"><link rel="prefetch" href="/assets/js/580.c8b424fb.js"><link rel="prefetch" href="/assets/js/581.d0145db3.js"><link rel="prefetch" href="/assets/js/582.cf02f385.js"><link rel="prefetch" href="/assets/js/583.ddea5b0d.js"><link rel="prefetch" href="/assets/js/584.0cc16d34.js"><link rel="prefetch" href="/assets/js/585.c447391d.js"><link rel="prefetch" href="/assets/js/586.df4eb9cd.js"><link rel="prefetch" href="/assets/js/587.10ee1879.js"><link rel="prefetch" href="/assets/js/588.f786f72b.js"><link rel="prefetch" href="/assets/js/589.c9585b6b.js"><link rel="prefetch" href="/assets/js/59.cec8b8e4.js"><link rel="prefetch" href="/assets/js/590.d58f3b92.js"><link rel="prefetch" href="/assets/js/591.5a7ede8d.js"><link rel="prefetch" href="/assets/js/592.37f408d3.js"><link rel="prefetch" href="/assets/js/593.4a806bb2.js"><link rel="prefetch" href="/assets/js/594.ed84c146.js"><link rel="prefetch" href="/assets/js/595.aa601bb0.js"><link rel="prefetch" href="/assets/js/596.a9c41a4f.js"><link rel="prefetch" href="/assets/js/597.5ebbba13.js"><link rel="prefetch" href="/assets/js/598.722f0a31.js"><link rel="prefetch" href="/assets/js/599.f307ce76.js"><link rel="prefetch" href="/assets/js/6.3450075a.js"><link rel="prefetch" href="/assets/js/60.31ea992e.js"><link rel="prefetch" href="/assets/js/600.61541c2b.js"><link rel="prefetch" href="/assets/js/601.d52d2580.js"><link rel="prefetch" href="/assets/js/602.07430208.js"><link rel="prefetch" href="/assets/js/603.0c6627b1.js"><link rel="prefetch" href="/assets/js/604.cfbfb4a9.js"><link rel="prefetch" href="/assets/js/605.307c2315.js"><link rel="prefetch" href="/assets/js/606.69523bf2.js"><link rel="prefetch" href="/assets/js/607.7fd1d0a9.js"><link rel="prefetch" href="/assets/js/608.8ac54eac.js"><link rel="prefetch" href="/assets/js/609.16ee9d18.js"><link rel="prefetch" href="/assets/js/61.91f8be9a.js"><link rel="prefetch" href="/assets/js/610.2696081c.js"><link rel="prefetch" href="/assets/js/611.cae8d15d.js"><link rel="prefetch" href="/assets/js/612.a7bbdb33.js"><link rel="prefetch" href="/assets/js/613.08525f49.js"><link rel="prefetch" href="/assets/js/614.d0a55e44.js"><link rel="prefetch" href="/assets/js/616.0f37f207.js"><link rel="prefetch" href="/assets/js/617.193d4902.js"><link rel="prefetch" href="/assets/js/618.0a95355e.js"><link rel="prefetch" href="/assets/js/619.a924c9b4.js"><link rel="prefetch" href="/assets/js/62.3c4e16b5.js"><link rel="prefetch" href="/assets/js/620.cee30d3f.js"><link rel="prefetch" href="/assets/js/621.49ab2c91.js"><link rel="prefetch" href="/assets/js/622.e7e619c4.js"><link rel="prefetch" href="/assets/js/623.3ef92ba2.js"><link rel="prefetch" href="/assets/js/624.f1d3238c.js"><link rel="prefetch" href="/assets/js/625.8a7a0611.js"><link rel="prefetch" href="/assets/js/626.9fd1ae19.js"><link rel="prefetch" href="/assets/js/627.57fca9fe.js"><link rel="prefetch" href="/assets/js/628.e2fd2c22.js"><link rel="prefetch" href="/assets/js/629.33c8405c.js"><link rel="prefetch" href="/assets/js/63.69f68e44.js"><link rel="prefetch" href="/assets/js/630.93c80187.js"><link rel="prefetch" href="/assets/js/631.bcc9f91f.js"><link rel="prefetch" href="/assets/js/632.4c5bd02a.js"><link rel="prefetch" href="/assets/js/633.75b73d02.js"><link rel="prefetch" href="/assets/js/634.028194f5.js"><link rel="prefetch" href="/assets/js/635.402943df.js"><link rel="prefetch" href="/assets/js/64.532ee46c.js"><link rel="prefetch" href="/assets/js/65.9e1f4290.js"><link rel="prefetch" href="/assets/js/66.ef2b4bb7.js"><link rel="prefetch" href="/assets/js/67.ab638ddc.js"><link rel="prefetch" href="/assets/js/68.62a1c4cf.js"><link rel="prefetch" href="/assets/js/69.c132ecf9.js"><link rel="prefetch" href="/assets/js/7.c5c54fb4.js"><link rel="prefetch" href="/assets/js/70.b43d79a7.js"><link rel="prefetch" href="/assets/js/71.add13364.js"><link rel="prefetch" href="/assets/js/72.adeb9caa.js"><link rel="prefetch" href="/assets/js/73.b1be9b18.js"><link rel="prefetch" href="/assets/js/74.46aa5512.js"><link rel="prefetch" href="/assets/js/75.61eca3de.js"><link rel="prefetch" href="/assets/js/76.cc2802e3.js"><link rel="prefetch" href="/assets/js/77.da24f38b.js"><link rel="prefetch" href="/assets/js/78.79bf9aa4.js"><link rel="prefetch" href="/assets/js/79.df11952f.js"><link rel="prefetch" href="/assets/js/8.de5c69e7.js"><link rel="prefetch" href="/assets/js/80.f29ee9a2.js"><link rel="prefetch" href="/assets/js/81.2b450674.js"><link rel="prefetch" href="/assets/js/82.13156504.js"><link rel="prefetch" href="/assets/js/83.e34d7844.js"><link rel="prefetch" href="/assets/js/84.a4c96ab7.js"><link rel="prefetch" href="/assets/js/85.0e71a3b0.js"><link rel="prefetch" href="/assets/js/86.0d2efd89.js"><link rel="prefetch" href="/assets/js/87.a1c4012a.js"><link rel="prefetch" href="/assets/js/88.3b2b71b6.js"><link rel="prefetch" href="/assets/js/89.5e5f9607.js"><link rel="prefetch" href="/assets/js/9.0b79e972.js"><link rel="prefetch" href="/assets/js/90.06a25bc1.js"><link rel="prefetch" href="/assets/js/91.2a338135.js"><link rel="prefetch" href="/assets/js/92.0834e685.js"><link rel="prefetch" href="/assets/js/93.b8060089.js"><link rel="prefetch" href="/assets/js/94.53d4ddf9.js"><link rel="prefetch" href="/assets/js/95.880645ca.js"><link rel="prefetch" href="/assets/js/96.2e0241dd.js"><link rel="prefetch" href="/assets/js/97.044c63a1.js"><link rel="prefetch" href="/assets/js/98.fa8e7351.js"><link rel="prefetch" href="/assets/js/99.b510a111.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.eff714eb.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.ccadf850.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;">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: #444"> |
| Contact us: Join QQ Group 659990460 | Add friend <i>tietouqiao</i> and be invited to Wechat Group<br> |
| see <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> for more</p></main></div><div class="global-ui"></div></div> |
| <script src="/assets/js/app.2be61c67.js" defer></script><script src="/assets/js/3.76c26675.js" defer></script><script src="/assets/js/615.3f880d36.js" defer></script> |
| </body> |
| </html> |
