| <!DOCTYPE html> |
| <html lang="en-US"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title> </title> |
| <meta name="generator" content="VuePress 1.7.1"> |
| <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.d276840c.css" as="style"><link rel="preload" href="/assets/js/app.2d9f721f.js" as="script"><link rel="preload" href="/assets/js/3.49f0f20a.js" as="script"><link rel="preload" href="/assets/js/156.abe544a2.js" as="script"><link rel="prefetch" href="/assets/js/10.a9e4399a.js"><link rel="prefetch" href="/assets/js/100.ba5ef33d.js"><link rel="prefetch" href="/assets/js/101.171f8761.js"><link rel="prefetch" href="/assets/js/102.929d5afc.js"><link rel="prefetch" href="/assets/js/103.da559ead.js"><link rel="prefetch" href="/assets/js/104.3a15190e.js"><link rel="prefetch" href="/assets/js/105.353b1e48.js"><link rel="prefetch" href="/assets/js/106.03a63894.js"><link rel="prefetch" href="/assets/js/107.36111d95.js"><link rel="prefetch" href="/assets/js/108.9105a72f.js"><link rel="prefetch" href="/assets/js/109.fa492f31.js"><link rel="prefetch" href="/assets/js/11.451d82d3.js"><link rel="prefetch" href="/assets/js/110.126ac45f.js"><link rel="prefetch" href="/assets/js/111.85dfb023.js"><link rel="prefetch" href="/assets/js/112.f375f562.js"><link rel="prefetch" href="/assets/js/113.831b60b8.js"><link rel="prefetch" href="/assets/js/114.45972c32.js"><link rel="prefetch" href="/assets/js/115.24bc1317.js"><link rel="prefetch" href="/assets/js/116.c8c2136b.js"><link rel="prefetch" href="/assets/js/117.9a1716be.js"><link rel="prefetch" href="/assets/js/118.635c3c25.js"><link rel="prefetch" href="/assets/js/119.5a7ed10f.js"><link rel="prefetch" href="/assets/js/12.cf8c947a.js"><link rel="prefetch" href="/assets/js/120.b065fbe5.js"><link rel="prefetch" href="/assets/js/121.831fdeb9.js"><link rel="prefetch" href="/assets/js/122.bb27427a.js"><link rel="prefetch" href="/assets/js/123.81a06a8b.js"><link rel="prefetch" href="/assets/js/124.a6b23716.js"><link rel="prefetch" href="/assets/js/125.5a26bdc3.js"><link rel="prefetch" href="/assets/js/126.ce9f64f8.js"><link rel="prefetch" href="/assets/js/127.a65e6703.js"><link rel="prefetch" href="/assets/js/128.6bd95ef8.js"><link rel="prefetch" href="/assets/js/129.557181ec.js"><link rel="prefetch" href="/assets/js/13.43f427ce.js"><link rel="prefetch" href="/assets/js/130.8be9208c.js"><link rel="prefetch" href="/assets/js/131.972ada92.js"><link rel="prefetch" href="/assets/js/132.8aeeff2a.js"><link rel="prefetch" href="/assets/js/133.42125b21.js"><link rel="prefetch" href="/assets/js/134.8da7c93c.js"><link rel="prefetch" href="/assets/js/135.e956dadc.js"><link rel="prefetch" href="/assets/js/136.8ba509c0.js"><link rel="prefetch" href="/assets/js/137.070af2e2.js"><link rel="prefetch" href="/assets/js/138.91e41f58.js"><link rel="prefetch" href="/assets/js/139.83777824.js"><link rel="prefetch" href="/assets/js/14.1f820e1c.js"><link rel="prefetch" href="/assets/js/140.64a1441b.js"><link rel="prefetch" href="/assets/js/141.7122d7d8.js"><link rel="prefetch" href="/assets/js/142.2da8e795.js"><link rel="prefetch" href="/assets/js/143.ace8b262.js"><link rel="prefetch" href="/assets/js/144.76405233.js"><link rel="prefetch" href="/assets/js/145.f404e342.js"><link rel="prefetch" href="/assets/js/146.842c4514.js"><link rel="prefetch" href="/assets/js/147.b0228a66.js"><link rel="prefetch" href="/assets/js/148.c50eeab6.js"><link rel="prefetch" href="/assets/js/149.1f855852.js"><link rel="prefetch" href="/assets/js/15.e2df8f28.js"><link rel="prefetch" href="/assets/js/150.0b4fa6cd.js"><link rel="prefetch" href="/assets/js/151.69e9c191.js"><link rel="prefetch" href="/assets/js/152.c7fe2a3a.js"><link rel="prefetch" href="/assets/js/153.ff906162.js"><link rel="prefetch" href="/assets/js/154.1c2d1128.js"><link rel="prefetch" href="/assets/js/155.077b5e1a.js"><link rel="prefetch" href="/assets/js/157.0c9acc19.js"><link rel="prefetch" href="/assets/js/158.555a123a.js"><link rel="prefetch" href="/assets/js/159.6ca7fe69.js"><link rel="prefetch" href="/assets/js/16.475d7beb.js"><link rel="prefetch" href="/assets/js/160.d64629ae.js"><link rel="prefetch" href="/assets/js/161.829c5fa2.js"><link rel="prefetch" href="/assets/js/162.3fb0ddf9.js"><link rel="prefetch" href="/assets/js/163.92ad4b6a.js"><link rel="prefetch" href="/assets/js/164.e79568a2.js"><link rel="prefetch" href="/assets/js/165.430a397d.js"><link rel="prefetch" href="/assets/js/166.4017da25.js"><link rel="prefetch" href="/assets/js/167.cf835bb6.js"><link rel="prefetch" href="/assets/js/168.a20d2200.js"><link rel="prefetch" href="/assets/js/169.a68130e7.js"><link rel="prefetch" href="/assets/js/17.a9b32e43.js"><link rel="prefetch" href="/assets/js/170.f93744ad.js"><link rel="prefetch" href="/assets/js/171.846c7818.js"><link rel="prefetch" href="/assets/js/172.1d4d210c.js"><link rel="prefetch" href="/assets/js/173.e72f36e6.js"><link rel="prefetch" href="/assets/js/174.a30d14d6.js"><link rel="prefetch" href="/assets/js/175.cc53d276.js"><link rel="prefetch" href="/assets/js/176.b715523a.js"><link rel="prefetch" href="/assets/js/177.8678b37d.js"><link rel="prefetch" href="/assets/js/178.1434582d.js"><link rel="prefetch" href="/assets/js/179.4e0d3bf3.js"><link rel="prefetch" href="/assets/js/18.d9689ab6.js"><link rel="prefetch" href="/assets/js/180.00be3167.js"><link rel="prefetch" href="/assets/js/181.fbb02c0b.js"><link rel="prefetch" href="/assets/js/182.2f1595bb.js"><link rel="prefetch" href="/assets/js/183.203bbb6c.js"><link rel="prefetch" href="/assets/js/184.454219df.js"><link rel="prefetch" href="/assets/js/185.cafb8a67.js"><link rel="prefetch" href="/assets/js/186.50895ff0.js"><link rel="prefetch" href="/assets/js/187.590d05b9.js"><link rel="prefetch" href="/assets/js/188.65db5944.js"><link rel="prefetch" href="/assets/js/189.f66501ca.js"><link rel="prefetch" href="/assets/js/19.d02f7224.js"><link rel="prefetch" href="/assets/js/190.f7da038f.js"><link rel="prefetch" href="/assets/js/191.d88d7a7e.js"><link rel="prefetch" href="/assets/js/192.bee0e390.js"><link rel="prefetch" href="/assets/js/193.bd0909b3.js"><link rel="prefetch" href="/assets/js/194.8cd3cf94.js"><link rel="prefetch" href="/assets/js/195.0cb325b7.js"><link rel="prefetch" href="/assets/js/196.55f5343f.js"><link rel="prefetch" href="/assets/js/197.d9458008.js"><link rel="prefetch" href="/assets/js/198.04d5e1b9.js"><link rel="prefetch" href="/assets/js/199.6abe3625.js"><link rel="prefetch" href="/assets/js/20.4bdfbbe8.js"><link rel="prefetch" href="/assets/js/200.872d6ddd.js"><link rel="prefetch" href="/assets/js/201.5ea59755.js"><link rel="prefetch" href="/assets/js/202.26203286.js"><link rel="prefetch" href="/assets/js/203.25fa8ef5.js"><link rel="prefetch" href="/assets/js/204.feedd6cb.js"><link rel="prefetch" href="/assets/js/205.9be903eb.js"><link rel="prefetch" href="/assets/js/206.3880ef2d.js"><link rel="prefetch" href="/assets/js/207.a9a1cdd6.js"><link rel="prefetch" href="/assets/js/208.0947cb35.js"><link rel="prefetch" href="/assets/js/209.c6549dca.js"><link rel="prefetch" href="/assets/js/21.3b6ef7f6.js"><link rel="prefetch" href="/assets/js/210.6ce2bfb8.js"><link rel="prefetch" href="/assets/js/211.585484ac.js"><link rel="prefetch" href="/assets/js/212.ac3ab6cc.js"><link rel="prefetch" href="/assets/js/213.ea573ed4.js"><link rel="prefetch" href="/assets/js/214.457e1e6c.js"><link rel="prefetch" href="/assets/js/215.a9da850d.js"><link rel="prefetch" href="/assets/js/216.92d360fe.js"><link rel="prefetch" href="/assets/js/217.1fe51f93.js"><link rel="prefetch" href="/assets/js/218.ad0e3172.js"><link rel="prefetch" href="/assets/js/219.91a77d54.js"><link rel="prefetch" href="/assets/js/22.3a778dd6.js"><link rel="prefetch" href="/assets/js/220.a1cfbc2d.js"><link rel="prefetch" href="/assets/js/221.c64d0603.js"><link rel="prefetch" href="/assets/js/222.040bd96c.js"><link rel="prefetch" href="/assets/js/223.2394e708.js"><link rel="prefetch" href="/assets/js/224.468a68ec.js"><link rel="prefetch" href="/assets/js/225.bb443096.js"><link rel="prefetch" href="/assets/js/226.977ab99e.js"><link rel="prefetch" href="/assets/js/227.a899440c.js"><link rel="prefetch" href="/assets/js/228.c8c4db7e.js"><link rel="prefetch" href="/assets/js/229.6f1ca21f.js"><link rel="prefetch" href="/assets/js/23.98609dbd.js"><link rel="prefetch" href="/assets/js/230.54e9683c.js"><link rel="prefetch" href="/assets/js/231.326ba32c.js"><link rel="prefetch" href="/assets/js/232.9adabbcc.js"><link rel="prefetch" href="/assets/js/233.b39649c0.js"><link rel="prefetch" href="/assets/js/234.09c514d6.js"><link rel="prefetch" href="/assets/js/235.edfc0356.js"><link rel="prefetch" href="/assets/js/236.a7955a5b.js"><link rel="prefetch" href="/assets/js/237.2a2ada84.js"><link rel="prefetch" href="/assets/js/238.811145d2.js"><link rel="prefetch" href="/assets/js/239.6f19dac4.js"><link rel="prefetch" href="/assets/js/24.2a2c516a.js"><link rel="prefetch" href="/assets/js/240.a6f6ac67.js"><link rel="prefetch" href="/assets/js/241.c1137589.js"><link rel="prefetch" href="/assets/js/242.4017f7c7.js"><link rel="prefetch" href="/assets/js/243.9d32afc7.js"><link rel="prefetch" href="/assets/js/244.1f52616e.js"><link rel="prefetch" href="/assets/js/245.026ba8cc.js"><link rel="prefetch" href="/assets/js/246.64d855a3.js"><link rel="prefetch" href="/assets/js/247.fd135f0d.js"><link rel="prefetch" href="/assets/js/248.3151199e.js"><link rel="prefetch" href="/assets/js/249.f52e6b30.js"><link rel="prefetch" href="/assets/js/25.cd0d0f82.js"><link rel="prefetch" href="/assets/js/250.a048e74a.js"><link rel="prefetch" href="/assets/js/251.1aa1c494.js"><link rel="prefetch" href="/assets/js/252.124474d6.js"><link rel="prefetch" href="/assets/js/253.5bf12918.js"><link rel="prefetch" href="/assets/js/254.9f4ea8e3.js"><link rel="prefetch" href="/assets/js/255.f1dd8325.js"><link rel="prefetch" href="/assets/js/256.adc6c406.js"><link rel="prefetch" href="/assets/js/257.4e779dfc.js"><link rel="prefetch" href="/assets/js/258.1c732e0f.js"><link rel="prefetch" href="/assets/js/259.64be4bc1.js"><link rel="prefetch" href="/assets/js/26.d959f814.js"><link rel="prefetch" href="/assets/js/260.323f78e0.js"><link rel="prefetch" href="/assets/js/261.428416ff.js"><link rel="prefetch" href="/assets/js/262.6b358709.js"><link rel="prefetch" href="/assets/js/263.c451f238.js"><link rel="prefetch" href="/assets/js/264.a0d7e0c6.js"><link rel="prefetch" href="/assets/js/265.ab6dd944.js"><link rel="prefetch" href="/assets/js/266.0b81eca0.js"><link rel="prefetch" href="/assets/js/267.0c0cdb51.js"><link rel="prefetch" href="/assets/js/268.72e5fd07.js"><link rel="prefetch" href="/assets/js/269.f0d4bcaf.js"><link rel="prefetch" href="/assets/js/27.af92df91.js"><link rel="prefetch" href="/assets/js/270.84a08165.js"><link rel="prefetch" href="/assets/js/271.c3aca162.js"><link rel="prefetch" href="/assets/js/272.b39d6dcf.js"><link rel="prefetch" href="/assets/js/273.85cf1548.js"><link rel="prefetch" href="/assets/js/274.f6435b5b.js"><link rel="prefetch" href="/assets/js/275.cd9a6ef6.js"><link rel="prefetch" href="/assets/js/276.271ab569.js"><link rel="prefetch" href="/assets/js/277.81dcd9f3.js"><link rel="prefetch" href="/assets/js/278.526b7958.js"><link rel="prefetch" href="/assets/js/279.45cea61f.js"><link rel="prefetch" href="/assets/js/28.8b6aeaad.js"><link rel="prefetch" href="/assets/js/280.ae1d47a7.js"><link rel="prefetch" href="/assets/js/281.fb9692d4.js"><link rel="prefetch" href="/assets/js/282.37344f5b.js"><link rel="prefetch" href="/assets/js/283.87c7cffb.js"><link rel="prefetch" href="/assets/js/284.5f1589f9.js"><link rel="prefetch" href="/assets/js/285.80dc4e5e.js"><link rel="prefetch" href="/assets/js/286.9278ae2b.js"><link rel="prefetch" href="/assets/js/287.b44b1e65.js"><link rel="prefetch" href="/assets/js/288.a4f0d998.js"><link rel="prefetch" href="/assets/js/289.7597e55a.js"><link rel="prefetch" href="/assets/js/29.aaa7d852.js"><link rel="prefetch" href="/assets/js/290.4a5562bf.js"><link rel="prefetch" href="/assets/js/291.2a647799.js"><link rel="prefetch" href="/assets/js/292.e7e84d10.js"><link rel="prefetch" href="/assets/js/293.25a2b951.js"><link rel="prefetch" href="/assets/js/294.248af525.js"><link rel="prefetch" href="/assets/js/295.a8606e61.js"><link rel="prefetch" href="/assets/js/296.362a5f51.js"><link rel="prefetch" href="/assets/js/297.672453a6.js"><link rel="prefetch" href="/assets/js/298.35b1ebf5.js"><link rel="prefetch" href="/assets/js/299.254af20b.js"><link rel="prefetch" href="/assets/js/30.7d0a4287.js"><link rel="prefetch" href="/assets/js/300.a265c35e.js"><link rel="prefetch" href="/assets/js/301.62a3058d.js"><link rel="prefetch" href="/assets/js/302.04db5d39.js"><link rel="prefetch" href="/assets/js/303.1c702885.js"><link rel="prefetch" href="/assets/js/304.9cdb68cd.js"><link rel="prefetch" href="/assets/js/305.c701ad61.js"><link rel="prefetch" href="/assets/js/306.5a2ff03d.js"><link rel="prefetch" href="/assets/js/307.ea1c8423.js"><link rel="prefetch" href="/assets/js/308.a7f31839.js"><link rel="prefetch" href="/assets/js/309.dd8b3f99.js"><link rel="prefetch" href="/assets/js/31.726da8fb.js"><link rel="prefetch" href="/assets/js/310.a7487717.js"><link rel="prefetch" href="/assets/js/311.d936351f.js"><link rel="prefetch" href="/assets/js/312.2e8aad38.js"><link rel="prefetch" href="/assets/js/313.2330b856.js"><link rel="prefetch" href="/assets/js/314.20249573.js"><link rel="prefetch" href="/assets/js/315.808c60cf.js"><link rel="prefetch" href="/assets/js/316.8bf5a648.js"><link rel="prefetch" href="/assets/js/317.dbe2f7a9.js"><link rel="prefetch" href="/assets/js/318.343cab8d.js"><link rel="prefetch" href="/assets/js/319.48b50aeb.js"><link rel="prefetch" href="/assets/js/32.4bcdb5c6.js"><link rel="prefetch" href="/assets/js/320.12e3c768.js"><link rel="prefetch" href="/assets/js/321.265b5e69.js"><link rel="prefetch" href="/assets/js/322.0f04f268.js"><link rel="prefetch" href="/assets/js/323.67091d7c.js"><link rel="prefetch" href="/assets/js/324.95460948.js"><link rel="prefetch" href="/assets/js/325.1960cc1d.js"><link rel="prefetch" href="/assets/js/326.47d2f9e8.js"><link rel="prefetch" href="/assets/js/327.41a629ff.js"><link rel="prefetch" href="/assets/js/328.6732f3e7.js"><link rel="prefetch" href="/assets/js/329.60cdc965.js"><link rel="prefetch" href="/assets/js/33.8ab920f1.js"><link rel="prefetch" href="/assets/js/330.9f792b24.js"><link rel="prefetch" href="/assets/js/331.035742f6.js"><link rel="prefetch" href="/assets/js/332.436b9f0e.js"><link rel="prefetch" href="/assets/js/333.53c5a66a.js"><link rel="prefetch" href="/assets/js/334.e63d2021.js"><link rel="prefetch" href="/assets/js/335.2af39e1e.js"><link rel="prefetch" href="/assets/js/336.8b1a7177.js"><link rel="prefetch" href="/assets/js/337.9fa726c8.js"><link rel="prefetch" href="/assets/js/338.4f4ae21e.js"><link rel="prefetch" href="/assets/js/339.8949c9ad.js"><link rel="prefetch" href="/assets/js/34.ea964755.js"><link rel="prefetch" href="/assets/js/340.bf0995e8.js"><link rel="prefetch" href="/assets/js/341.6303a4d7.js"><link rel="prefetch" href="/assets/js/342.47e422b3.js"><link rel="prefetch" href="/assets/js/343.0ef7b73a.js"><link rel="prefetch" href="/assets/js/344.df1ecf95.js"><link rel="prefetch" href="/assets/js/345.41c4bc4f.js"><link rel="prefetch" href="/assets/js/346.a2043e83.js"><link rel="prefetch" href="/assets/js/347.decdcdaf.js"><link rel="prefetch" href="/assets/js/348.97585b42.js"><link rel="prefetch" href="/assets/js/349.71f7fd12.js"><link rel="prefetch" href="/assets/js/35.99f1de20.js"><link rel="prefetch" href="/assets/js/350.eb59d668.js"><link rel="prefetch" href="/assets/js/351.9ed7aff8.js"><link rel="prefetch" href="/assets/js/352.7e4f7d8e.js"><link rel="prefetch" href="/assets/js/353.7f722b41.js"><link rel="prefetch" href="/assets/js/354.f0aadfac.js"><link rel="prefetch" href="/assets/js/355.c04ebf11.js"><link rel="prefetch" href="/assets/js/356.e89af531.js"><link rel="prefetch" href="/assets/js/357.826af5e5.js"><link rel="prefetch" href="/assets/js/358.99535932.js"><link rel="prefetch" href="/assets/js/359.8090d41e.js"><link rel="prefetch" href="/assets/js/36.a48b4b37.js"><link rel="prefetch" href="/assets/js/360.c220a402.js"><link rel="prefetch" href="/assets/js/361.14f8dfec.js"><link rel="prefetch" href="/assets/js/362.abdd6c75.js"><link rel="prefetch" href="/assets/js/363.ba7fa5d7.js"><link rel="prefetch" href="/assets/js/364.c0587e42.js"><link rel="prefetch" href="/assets/js/365.bb454ceb.js"><link rel="prefetch" href="/assets/js/366.3f1ced2d.js"><link rel="prefetch" href="/assets/js/367.46f6f0f4.js"><link rel="prefetch" href="/assets/js/368.68c11a35.js"><link rel="prefetch" href="/assets/js/369.19311ac8.js"><link rel="prefetch" href="/assets/js/37.db760323.js"><link rel="prefetch" href="/assets/js/370.bb84c32f.js"><link rel="prefetch" href="/assets/js/371.17840537.js"><link rel="prefetch" href="/assets/js/372.31acbbe3.js"><link rel="prefetch" href="/assets/js/373.a2ba7c45.js"><link rel="prefetch" href="/assets/js/374.1a1a16a1.js"><link rel="prefetch" href="/assets/js/375.eebd7359.js"><link rel="prefetch" href="/assets/js/376.9cf8f56c.js"><link rel="prefetch" href="/assets/js/377.7ba65d34.js"><link rel="prefetch" href="/assets/js/378.55c76a0d.js"><link rel="prefetch" href="/assets/js/379.db1c92c5.js"><link rel="prefetch" href="/assets/js/38.8fed9f84.js"><link rel="prefetch" href="/assets/js/380.3d60a081.js"><link rel="prefetch" href="/assets/js/381.606bdf8e.js"><link rel="prefetch" href="/assets/js/382.7a25bda9.js"><link rel="prefetch" href="/assets/js/383.09041d12.js"><link rel="prefetch" href="/assets/js/384.f8bf5ee7.js"><link rel="prefetch" href="/assets/js/385.4e3b7c37.js"><link rel="prefetch" href="/assets/js/386.f5533c34.js"><link rel="prefetch" href="/assets/js/387.ba8c00fd.js"><link rel="prefetch" href="/assets/js/388.57592a6f.js"><link rel="prefetch" href="/assets/js/389.bac26d9d.js"><link rel="prefetch" href="/assets/js/39.19faa053.js"><link rel="prefetch" href="/assets/js/390.ed8bf70b.js"><link rel="prefetch" href="/assets/js/391.f964db09.js"><link rel="prefetch" href="/assets/js/392.6fc39528.js"><link rel="prefetch" href="/assets/js/393.9b205a67.js"><link rel="prefetch" href="/assets/js/394.18d6cdee.js"><link rel="prefetch" href="/assets/js/395.677897e5.js"><link rel="prefetch" href="/assets/js/396.a80f63c8.js"><link rel="prefetch" href="/assets/js/397.58eab3d8.js"><link rel="prefetch" href="/assets/js/398.766a38ef.js"><link rel="prefetch" href="/assets/js/399.d106c2f0.js"><link rel="prefetch" href="/assets/js/4.25217f62.js"><link rel="prefetch" href="/assets/js/40.136d8d9f.js"><link rel="prefetch" href="/assets/js/400.337fea8b.js"><link rel="prefetch" href="/assets/js/401.2dfbc864.js"><link rel="prefetch" href="/assets/js/402.4718251d.js"><link rel="prefetch" href="/assets/js/403.2e513ddb.js"><link rel="prefetch" href="/assets/js/404.167e07f4.js"><link rel="prefetch" href="/assets/js/405.b98471f9.js"><link rel="prefetch" href="/assets/js/406.400a0a5d.js"><link rel="prefetch" href="/assets/js/407.e48ea279.js"><link rel="prefetch" href="/assets/js/408.7df9274f.js"><link rel="prefetch" href="/assets/js/409.2d3f18a1.js"><link rel="prefetch" href="/assets/js/41.4facf3db.js"><link rel="prefetch" href="/assets/js/410.25ffe749.js"><link rel="prefetch" href="/assets/js/411.7a16af16.js"><link rel="prefetch" href="/assets/js/412.fcbaf57d.js"><link rel="prefetch" href="/assets/js/413.f98e9cc5.js"><link rel="prefetch" href="/assets/js/414.3f6175d9.js"><link rel="prefetch" href="/assets/js/415.e25a6fc1.js"><link rel="prefetch" href="/assets/js/416.7bc79a5f.js"><link rel="prefetch" href="/assets/js/417.242c8672.js"><link rel="prefetch" href="/assets/js/418.371820fe.js"><link rel="prefetch" href="/assets/js/419.756740c5.js"><link rel="prefetch" href="/assets/js/42.101ecd13.js"><link rel="prefetch" href="/assets/js/420.7da470eb.js"><link rel="prefetch" href="/assets/js/421.c5792767.js"><link rel="prefetch" href="/assets/js/422.01b71130.js"><link rel="prefetch" href="/assets/js/423.d6a5d111.js"><link rel="prefetch" href="/assets/js/424.357764b2.js"><link rel="prefetch" href="/assets/js/425.a1616091.js"><link rel="prefetch" href="/assets/js/426.bc92fc07.js"><link rel="prefetch" href="/assets/js/427.a51c496a.js"><link rel="prefetch" href="/assets/js/428.c2e9b9e3.js"><link rel="prefetch" href="/assets/js/429.41875693.js"><link rel="prefetch" href="/assets/js/43.94168007.js"><link rel="prefetch" href="/assets/js/430.d6df8d94.js"><link rel="prefetch" href="/assets/js/431.54aaaaf5.js"><link rel="prefetch" href="/assets/js/432.c2f3792d.js"><link rel="prefetch" href="/assets/js/433.910271e4.js"><link rel="prefetch" href="/assets/js/434.a2ee8283.js"><link rel="prefetch" href="/assets/js/435.42ae28c9.js"><link rel="prefetch" href="/assets/js/436.61bde093.js"><link rel="prefetch" href="/assets/js/437.78c3a497.js"><link rel="prefetch" href="/assets/js/438.30cec322.js"><link rel="prefetch" href="/assets/js/439.ee49a21b.js"><link rel="prefetch" href="/assets/js/44.2ea7b90c.js"><link rel="prefetch" href="/assets/js/440.931eed83.js"><link rel="prefetch" href="/assets/js/441.2894683e.js"><link rel="prefetch" href="/assets/js/442.af159242.js"><link rel="prefetch" href="/assets/js/443.24f45d52.js"><link rel="prefetch" href="/assets/js/444.991f76cc.js"><link rel="prefetch" href="/assets/js/445.73411379.js"><link rel="prefetch" href="/assets/js/446.4dd82c5e.js"><link rel="prefetch" href="/assets/js/447.a4aa035d.js"><link rel="prefetch" href="/assets/js/448.2f5fce12.js"><link rel="prefetch" href="/assets/js/449.4a2023d6.js"><link rel="prefetch" href="/assets/js/45.163d7c8e.js"><link rel="prefetch" href="/assets/js/450.0a11dc6e.js"><link rel="prefetch" href="/assets/js/451.7e588d9d.js"><link rel="prefetch" href="/assets/js/452.ed592164.js"><link rel="prefetch" href="/assets/js/453.864c5f05.js"><link rel="prefetch" href="/assets/js/454.da79a131.js"><link rel="prefetch" href="/assets/js/455.d95b5373.js"><link rel="prefetch" href="/assets/js/456.bd9bcfce.js"><link rel="prefetch" href="/assets/js/457.4809f869.js"><link rel="prefetch" href="/assets/js/458.9026ca80.js"><link rel="prefetch" href="/assets/js/459.60d64547.js"><link rel="prefetch" href="/assets/js/46.4b1b1ef3.js"><link rel="prefetch" href="/assets/js/460.2227a328.js"><link rel="prefetch" href="/assets/js/461.81e43f8e.js"><link rel="prefetch" href="/assets/js/462.7795f8e9.js"><link rel="prefetch" href="/assets/js/463.d88ac1d3.js"><link rel="prefetch" href="/assets/js/464.d2312c31.js"><link rel="prefetch" href="/assets/js/465.c914c504.js"><link rel="prefetch" href="/assets/js/466.6a5d8957.js"><link rel="prefetch" href="/assets/js/467.ca8605e7.js"><link rel="prefetch" href="/assets/js/468.0e999241.js"><link rel="prefetch" href="/assets/js/469.489c219e.js"><link rel="prefetch" href="/assets/js/47.3e0e03fb.js"><link rel="prefetch" href="/assets/js/470.a0285511.js"><link rel="prefetch" href="/assets/js/471.082a37ac.js"><link rel="prefetch" href="/assets/js/472.cd7505f9.js"><link rel="prefetch" href="/assets/js/473.30b73d15.js"><link rel="prefetch" href="/assets/js/474.cc20c3dc.js"><link rel="prefetch" href="/assets/js/475.5731fc15.js"><link rel="prefetch" href="/assets/js/476.b9fe9a77.js"><link rel="prefetch" href="/assets/js/477.b3aaff23.js"><link rel="prefetch" href="/assets/js/478.ad1b02a1.js"><link rel="prefetch" href="/assets/js/479.3864355e.js"><link rel="prefetch" href="/assets/js/48.57af7d42.js"><link rel="prefetch" href="/assets/js/480.bb450761.js"><link rel="prefetch" href="/assets/js/481.301b958c.js"><link rel="prefetch" href="/assets/js/482.08cf021a.js"><link rel="prefetch" href="/assets/js/483.4449036a.js"><link rel="prefetch" href="/assets/js/484.73de0b8b.js"><link rel="prefetch" href="/assets/js/485.84781f39.js"><link rel="prefetch" href="/assets/js/486.eb1b7e12.js"><link rel="prefetch" href="/assets/js/487.7aa21787.js"><link rel="prefetch" href="/assets/js/488.4d4dded0.js"><link rel="prefetch" href="/assets/js/489.50a74a40.js"><link rel="prefetch" href="/assets/js/49.4bc9b1f3.js"><link rel="prefetch" href="/assets/js/490.a9724fe7.js"><link rel="prefetch" href="/assets/js/491.42ee97a9.js"><link rel="prefetch" href="/assets/js/492.cf8d2f62.js"><link rel="prefetch" href="/assets/js/493.5b4de2b3.js"><link rel="prefetch" href="/assets/js/494.a70d76eb.js"><link rel="prefetch" href="/assets/js/495.cdc493e7.js"><link rel="prefetch" href="/assets/js/496.be737b9d.js"><link rel="prefetch" href="/assets/js/497.0dd67f55.js"><link rel="prefetch" href="/assets/js/498.4fd28f6f.js"><link rel="prefetch" href="/assets/js/499.143657be.js"><link rel="prefetch" href="/assets/js/5.fac76b90.js"><link rel="prefetch" href="/assets/js/50.27055b53.js"><link rel="prefetch" href="/assets/js/500.e3a83b7a.js"><link rel="prefetch" href="/assets/js/501.ae85573c.js"><link rel="prefetch" href="/assets/js/502.7d9fc9bd.js"><link rel="prefetch" href="/assets/js/503.38bbcda9.js"><link rel="prefetch" href="/assets/js/504.6e3843b6.js"><link rel="prefetch" href="/assets/js/505.88b2796a.js"><link rel="prefetch" href="/assets/js/506.a7ee655e.js"><link rel="prefetch" href="/assets/js/507.5e16ba46.js"><link rel="prefetch" href="/assets/js/508.d7a453d3.js"><link rel="prefetch" href="/assets/js/509.eb0ed14d.js"><link rel="prefetch" href="/assets/js/51.f0e0297c.js"><link rel="prefetch" href="/assets/js/510.b2a089ea.js"><link rel="prefetch" href="/assets/js/511.e1ecfc54.js"><link rel="prefetch" href="/assets/js/512.b8ae3e5c.js"><link rel="prefetch" href="/assets/js/513.9e6e791d.js"><link rel="prefetch" href="/assets/js/514.5ca28edc.js"><link rel="prefetch" href="/assets/js/515.fea2d419.js"><link rel="prefetch" href="/assets/js/516.7b5546f8.js"><link rel="prefetch" href="/assets/js/517.57dfb309.js"><link rel="prefetch" href="/assets/js/518.ae8622ad.js"><link rel="prefetch" href="/assets/js/519.bf5e3f29.js"><link rel="prefetch" href="/assets/js/52.08471186.js"><link rel="prefetch" href="/assets/js/520.1ae1c523.js"><link rel="prefetch" href="/assets/js/521.befe67b0.js"><link rel="prefetch" href="/assets/js/53.81c949e4.js"><link rel="prefetch" href="/assets/js/54.848b2264.js"><link rel="prefetch" href="/assets/js/55.86053220.js"><link rel="prefetch" href="/assets/js/56.dba4f9be.js"><link rel="prefetch" href="/assets/js/57.0cb031b2.js"><link rel="prefetch" href="/assets/js/58.fb2916c4.js"><link rel="prefetch" href="/assets/js/59.4309e6b1.js"><link rel="prefetch" href="/assets/js/6.d37d398a.js"><link rel="prefetch" href="/assets/js/60.e3f13576.js"><link rel="prefetch" href="/assets/js/61.1cd885c0.js"><link rel="prefetch" href="/assets/js/62.f3b58093.js"><link rel="prefetch" href="/assets/js/63.889bc046.js"><link rel="prefetch" href="/assets/js/64.78c508ed.js"><link rel="prefetch" href="/assets/js/65.61916ea2.js"><link rel="prefetch" href="/assets/js/66.916f01bc.js"><link rel="prefetch" href="/assets/js/67.3d95afce.js"><link rel="prefetch" href="/assets/js/68.057cb2eb.js"><link rel="prefetch" href="/assets/js/69.44dfc2db.js"><link rel="prefetch" href="/assets/js/7.8c733af6.js"><link rel="prefetch" href="/assets/js/70.f3de1a45.js"><link rel="prefetch" href="/assets/js/71.1e48720c.js"><link rel="prefetch" href="/assets/js/72.3ffd02d2.js"><link rel="prefetch" href="/assets/js/73.cd52574c.js"><link rel="prefetch" href="/assets/js/74.e7922944.js"><link rel="prefetch" href="/assets/js/75.0c0d71a4.js"><link rel="prefetch" href="/assets/js/76.06e76fe6.js"><link rel="prefetch" href="/assets/js/77.2e226d5f.js"><link rel="prefetch" href="/assets/js/78.50792f50.js"><link rel="prefetch" href="/assets/js/79.c31a052f.js"><link rel="prefetch" href="/assets/js/8.f55810ca.js"><link rel="prefetch" href="/assets/js/80.0e0545ef.js"><link rel="prefetch" href="/assets/js/81.e2f02bd5.js"><link rel="prefetch" href="/assets/js/82.5d9fba7f.js"><link rel="prefetch" href="/assets/js/83.b090cd46.js"><link rel="prefetch" href="/assets/js/84.9dfb12d3.js"><link rel="prefetch" href="/assets/js/85.0da5b711.js"><link rel="prefetch" href="/assets/js/86.4ba13ae2.js"><link rel="prefetch" href="/assets/js/87.d5e564f9.js"><link rel="prefetch" href="/assets/js/88.0bd3859f.js"><link rel="prefetch" href="/assets/js/89.1433e04d.js"><link rel="prefetch" href="/assets/js/9.40f5f70c.js"><link rel="prefetch" href="/assets/js/90.eec1b515.js"><link rel="prefetch" href="/assets/js/91.a5f309f5.js"><link rel="prefetch" href="/assets/js/92.f8859fdb.js"><link rel="prefetch" href="/assets/js/93.9e461ef4.js"><link rel="prefetch" href="/assets/js/94.cda4f85a.js"><link rel="prefetch" href="/assets/js/95.698d9c0c.js"><link rel="prefetch" href="/assets/js/96.212b475a.js"><link rel="prefetch" href="/assets/js/97.1ea2049d.js"><link rel="prefetch" href="/assets/js/98.e70322dc.js"><link rel="prefetch" href="/assets/js/99.9021fb69.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.262891fb.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.d276840c.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="/" 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">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/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="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</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="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</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"> |
| Foundation |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| License |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| Security |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| Sponsorship |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| Thanks |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| Current Events |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Client/Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Client/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">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/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="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</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="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</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"> |
| Foundation |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| License |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| Security |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| Sponsorship |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| Thanks |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| Current Events |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Client/Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Client/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 User Guide (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Client</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.11.x/Client/Command Line Interface.html" class="sidebar-link">Command Line Interface</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Native API.html" class="sidebar-link">Native API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Other Languages.html" class="sidebar-link">Other Languages</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - TsFile API.html" class="active sidebar-link">TsFile API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - MQTT.html" class="sidebar-link">MQTT</a></li><li><a href="/UserGuide/V0.11.x/Client/Status Codes.html" class="sidebar-link">Status Codes</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="programming-tsfile-api"><a href="#programming-tsfile-api" class="header-anchor">#</a> Programming - TsFile API</h1> <p>TsFile is a file format of Time Series used in IoTDB. This session introduces the usage of this file format.</p> <h2 id="tsfile-library-installation"><a href="#tsfile-library-installation" class="header-anchor">#</a> TsFile library Installation</h2> <p>There are two ways to use TsFile in your own project.</p> <ul><li><p>Use as jars:</p> <ul><li><p>Compile the source codes and build to jars</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>git clone https://github.com/apache/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>Then, all the jars are in folder named <code>target/</code>. Import <code>target/tsfile-0.11.1-jar-with-dependencies.jar</code> to your project.</p></li></ul></li> <li><p>Use as a maven dependency:</p> <p>Compile source codes and deploy to your local repository in three steps:</p> <ul><li><p>Get the source codes</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>git clone https://github.com/apache/iotdb.git |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Compile the source codes and deploy</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>add dependencies into your project:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>tsfile</artifactId> |
| <version>0.11.1</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>Or, you can download the dependencies from official Maven repository:</p> <ul><li><p>First, find your maven <code>settings.xml</code> on path: <code>${username}\.m2\settings.xml</code> |
| , add this <code><profile></code> to <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>Then add dependencies into your project:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>tsfile</artifactId> |
| <version>0.11.1</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-usage"><a href="#tsfile-usage" class="header-anchor">#</a> TSFile Usage</h2> <p>This section demonstrates the detailed usages of TsFile.</p> <h3 id="time-series-data"><a href="#time-series-data" class="header-anchor">#</a> Time-series Data</h3> <p>Time-series data is considered as a sequence of quadruples. A quadruple is defined as (device, measurement, time, value).</p> <ul><li><p><strong>measurement</strong>: A physical or formal measurement that a time-series data takes, e.g., the temperature of a city, the |
| sales number of some goods or the speed of a train at different times. As a traditional sensor (like a thermometer) also |
| takes a single measurement and produce a time-series, we will use measurement and sensor interchangeably below.</p></li> <li><p><strong>device</strong>: A device refers to an entity that takes several measurements (producing multiple time-series), e.g., |
| a running train monitors its speed, oil meter, miles it has run, current passengers each is conveyed to a time-series dataset.</p></li></ul> <p>Table 1 illustrates a set of time-series data. The set showed in the following table contains one device named "device_1" |
| with three measurements named "sensor_1", "sensor_2" and "sensor_3".</p> <center><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>A set of time-series data</span></center> <p><strong>One Line of Data</strong>: In many industrial applications, a device normally contains more than one sensor and these sensors |
| may have values at the same timestamp, which is called one line of data.</p> <p>Formally, one line of data consists of a <code>device_id</code>, a timestamp which indicates the milliseconds since January 1, |
| 1970, 00:00:00, and several data pairs composed of <code>measurement_id</code> and corresponding <code>value</code>. All data pairs in one |
| line belong to this <code>device_id</code> and have the same timestamp. If one of the <code>measurements</code> does not have a <code>value</code> |
| in the <code>timestamp</code>, use a space instead(Actually, TsFile does not store null values). Its format is shown as follow:</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>An example is illustrated as follow. In this example, the data type of two measurements are <code>INT32</code>, <code>FLOAT</code> respectively.</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="write-tsfile"><a href="#write-tsfile" class="header-anchor">#</a> Write TsFile</h3> <h4 id="generate-a-tsfile-file"><a href="#generate-a-tsfile-file" class="header-anchor">#</a> Generate a TsFile File.</h4> <p>A TsFile is generated by the following three steps and the complete code is given in the section "Example for writing TsFile".</p> <ul><li><p>First, construct a <code>TsFileWriter</code> instance.</p> <p>Here are the available constructors:</p> <ul><li>Without pre-defined schema</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>With pre-defined schema</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>This one is for using the HDFS file system. <code>TsFileOutput</code> can be an instance of class <code>HDFSOutput</code>.</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>If you want to set some TSFile configuration on your own, you could use param <code>config</code>. For example:</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>In this example, data files will be stored in HDFS, instead of local file system. If you'd like to store data files in local file system, you can use <code>conf.setTSFileStorageFs("LOCAL")</code>, which is also the default config.</p> <p>You can also config the ip and rpc port of your HDFS by <code>config.setHdfsIp(...)</code> and <code>config.setHdfsPort(...)</code>. The default ip is <code>localhost</code> and default rpc port is <code>9000</code>.</p> <p><strong>Parameters:</strong></p> <ul><li><p>file : The TsFile to write</p></li> <li><p>schema : The file schemas, will be introduced in next part.</p></li> <li><p>config : The config of TsFile.</p></li></ul></li> <li><p>Second, add measurements</p> <p>Or you can make an instance of class <code>Schema</code> first and pass this to the constructor of class <code>TsFileWriter</code></p> <p>The class <code>Schema</code> contains a map whose key is the name of one measurement schema, and the value is the schema itself.</p> <p>Here are the interfaces:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>// Create an empty Schema or from an existing map |
| 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) |
| // Some useful getter and checker |
| 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>You can always use the following interface in <code>TsFileWriter</code> class to add additional measurements: |
| </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>The class <code>MeasurementSchema</code> contains the information of one measurement, there are several constructors:</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>Parameters:</strong> |
| </p> <ul><li><p>measurementID: The name of this measurement, typically the name of the sensor.</p></li> <li><p>type: The data type, now support six types: <code>BOOLEAN</code>, <code>INT32</code>, <code>INT64</code>, <code>FLOAT</code>, <code>DOUBLE</code>, <code>TEXT</code>;</p></li> <li><p>encoding: The data encoding. See <a href="/UserGuide/V0.11.x/Concept/Encoding.html">Chapter 2-3</a>.</p></li> <li><p>compression: The data compression. Now supports <code>UNCOMPRESSED</code> and <code>SNAPPY</code>.</p></li> <li><p>props: Properties for special data types.Such as <code>max_point_number</code> for <code>FLOAT</code> and <code>DOUBLE</code>, <code>max_string_length</code> for |
| <code>TEXT</code>. Use as string pairs into a map such as ("max_point_number", "3").</p></li></ul> <blockquote><p><strong>Notice:</strong> Although one measurement name can be used in multiple deltaObjects, the properties cannot be changed. I.e. |
| it's not allowed to add one measurement name for multiple times with different type or encoding. |
| Here is a bad example:</p></blockquote> <div class="language- extra-class"><pre><code> // The measurement "sensor_1" is float type |
| addMeasurement(new MeasurementSchema("sensor_1", TSDataType.FLOAT, TSEncoding.RLE)); |
| |
| // This call will throw a WriteProcessException exception |
| addMeasurement(new MeasurementSchema("sensor_1", TSDataType.INT32, TSEncoding.RLE)); |
| </code></pre></div></li> <li><p>Third, insert and write data continually.</p> <p>Use this interface to create a new <code>TSRecord</code>(a timestamp and device pair).</p> <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>Then create a <code>DataPoint</code>(a measurement and value pair), and use the addTuple method to add the DataPoint to the correct |
| TsRecord.</p> <p>Use this method to write</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>Finally, call <code>close</code> to finish this writing process.</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> <p>We are also able to write data into a closed TsFile.</p> <ul><li>Use <code>ForceAppendTsFileWriter</code> to open a closed file.</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public ForceAppendTsFileWriter(File file) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li><p>call <code>doTruncate</code> truncate the part of Metadata</p></li> <li><p>Then use <code>ForceAppendTsFileWriter</code> to construct a new <code>TsFileWriter</code></p></li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(TsFileIOWriter fileWriter) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Please note, we should redo the step of adding measurements before writing new data to the TsFile.</p> <h4 id="example-for-writing-a-tsfile"><a href="#example-for-writing-a-tsfile" class="header-anchor">#</a> Example for writing a TsFile</h4> <p>You should install TsFile to your local maven repository.</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>You could write a TsFile by constructing <strong>TSRecord</strong> if you have the <strong>non-aligned</strong> (e.g. not all sensors contain values) time series data.</p> <p>A more thorough example can be found at <code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTSRecord.java</code></p> <p>You could write a TsFile by constructing <strong>Tablet</strong> if you have the <strong>aligned</strong> time series data.</p> <p>A more thorough example can be found at <code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTablet.java</code></p> <p>You could write data into a closed TsFile by using <strong>ForceAppendTsFileWriter</strong>.</p> <p>A more thorough example can be found at <code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileForceAppendWrite.java</code></p> <h3 id="interface-for-reading-tsfile"><a href="#interface-for-reading-tsfile" class="header-anchor">#</a> Interface for Reading TsFile</h3> <h4 id="before-the-start"><a href="#before-the-start" class="header-anchor">#</a> Before the Start</h4> <p>The set of time-series data in section "Time-series Data" is used here for a concrete introduction in this section. The set showed in the following table contains one deltaObject named "device_1" with three measurements named "sensor_1", "sensor_2" and "sensor_3". And the measurements has been simplified to do a simple illustration, which contains only 4 time-value pairs each.</p> <center><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>A set of time-series data</span></center> <h4 id="definition-of-path"><a href="#definition-of-path" class="header-anchor">#</a> Definition of Path</h4> <p>A path is a dot-separated string which uniquely identifies a time-series in TsFile, e.g., "root.area_1.device_1.sensor_1". |
| The last section "sensor_1" is called "measurementId" while the remaining parts "root.area_1.device_1" is called deviceId. |
| As mentioned above, the same measurement in different devices has the same data type and encoding, and devices are also unique.</p> <p>In read interfaces, The parameter <code>paths</code> indicates the measurements to be selected.</p> <p>Path instance can be easily constructed through the class <code>Path</code>. For example:</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>We will pass an ArrayList of paths for final query call to support multiple paths.</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><strong>Notice:</strong> When constructing a Path, the format of the parameter should be a dot-separated string, the last part will |
| be recognized as measurementId while the remaining parts will be recognized as deviceId.</p></blockquote> <h4 id="definition-of-filter"><a href="#definition-of-filter" class="header-anchor">#</a> Definition of Filter</h4> <h5 id="usage-scenario"><a href="#usage-scenario" class="header-anchor">#</a> Usage Scenario</h5> <p>Filter is used in TsFile reading process to select data satisfying one or more given condition(s).</p> <h4 id="iexpression"><a href="#iexpression" class="header-anchor">#</a> IExpression</h4> <p>The <code>IExpression</code> is a filter expression interface and it will be passed to our final query call. |
| We create one or more filter expressions and may use binary filter operators to link them to our final expression.</p> <ul><li><p><strong>Create a Filter Expression</strong></p> <p>There are two types of filters.</p> <ul><li><p>TimeFilter: A filter for <code>time</code> in time-series data.</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>Use the following relationships to get a <code>TimeFilter</code> object (value is a long int variable). |
| <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: A filter for <code>value</code> in time-series data.</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>The usage of <code>ValueFilter</code> is the same as using <code>TimeFilter</code>, just to make sure that the type of the value |
| equal to the measurement's(defined in the path).</p></li></ul></li> <li><p><strong>Binary Filter Operators</strong></p> <p>Binary filter operators can be used to link two single expressions.</p> <ul><li>BinaryExpression.and(Expression, Expression): Choose the value satisfy for both expressions.</li> <li>BinaryExpression.or(Expression, Expression): Choose the value satisfy for at least one expression.</li></ul></li></ul> <h5 id="filter-expression-examples"><a href="#filter-expression-examples" class="header-anchor">#</a> Filter Expression Examples</h5> <ul><li><p><strong>TimeFilterExpression Examples</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="read-interface"><a href="#read-interface" class="header-anchor">#</a> Read Interface</h4> <p>First, we open the TsFile and get a <code>ReadOnlyTsFile</code> instance from a file path string <code>path</code>.</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>Next, we prepare the path array and query expression, then get final <code>QueryExpression</code> object by this interface:</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>The ReadOnlyTsFile class has two <code>query</code> method to perform a query.</p> <ul><li><p><strong>Method 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>Method 2</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>This method is designed for advanced applications such as the TsFile-Spark Connector.</p> <ul><li><p><strong>params</strong> : For method 2, two additional parameters are added to support partial query:</p> <ul><li><code>partitionStartOffset</code>: start offset for a TsFile</li> <li><code>partitionEndOffset</code>: end offset for a TsFile</li></ul> <blockquote><p><strong>What is Partial Query ?</strong></p> <p>In some distributed file systems(e.g. HDFS), a file is split into severval parts which are called "Blocks" and stored in different nodes. Executing a query paralleled in each nodes involved makes better efficiency. Thus Partial Query is needed. Paritial Query only selects the results stored in the part split by <code>QueryConstant.PARTITION_START_OFFSET</code> and <code>QueryConstant.PARTITION_END_OFFSET</code> for a TsFile.</p></blockquote></li></ul></li></ul> <h3 id="querydataset-interface"><a href="#querydataset-interface" class="header-anchor">#</a> QueryDataset Interface</h3> <p>The query performed above will return a <code>QueryDataset</code> object.</p> <p>Here's the useful interfaces for user.</p> <ul><li><p><code>bool hasNext();</code></p> <p>Return true if this dataset still has elements.</p></li> <li><p><code>List<Path> getPaths()</code></p> <p>Get the paths in this data set.</p></li> <li><p><code>List<TSDataType> getDataTypes();</code></p> <p>Get the data types. The class TSDataType is an enum class, the value will be one of the following:</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>Get the next record.</p> <p>The class <code>RowRecord</code> consists of a <code>long</code> timestamp and a <code>List<Field></code> for data in different sensors, |
| we can use two getter methods to get them.</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>To get data from one Field, use these methods:</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="example-for-reading-an-existing-tsfile"><a href="#example-for-reading-an-existing-tsfile" class="header-anchor">#</a> Example for reading an existing TsFile</h4> <p>You should install TsFile to your local maven repository.</p> <p>A more thorough example with query statement can be found at |
| <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">/** |
| * The class is to show how to read TsFile file named "test.tsfile". |
| * The TsFile file "test.tsfile" is generated from class TsFileWrite. |
| * Run TsFileWrite to generate the test.tsfile first |
| */</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">// file path</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">// create reader and get the readTsFile interface</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">// use these paths(all sensors) for all the queries</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">// no query statement</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">//close the reader when you left</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="change-tsfile-configuration"><a href="#change-tsfile-configuration" class="header-anchor">#</a> Change TsFile Configuration</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></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/UserGuide/V0.11.x/Client/Programming - Other Languages.html" class="prev"> |
| Other Languages |
| </a></span> <span class="next"><a href="/UserGuide/V0.11.x/Client/Programming - MQTT.html"> |
| MQTT |
| </a> |
| → |
| </span></p></div> <p style="text-align: center;">Copyright © 2020 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.2d9f721f.js" defer></script><script src="/assets/js/3.49f0f20a.js" defer></script><script src="/assets/js/156.abe544a2.js" defer></script> |
| </body> |
| </html> |