| <!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 1.8.0"> |
| <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.679f71b6.css" as="style"><link rel="preload" href="/assets/js/app.0fe82a0a.js" as="script"><link rel="preload" href="/assets/js/3.80bccc99.js" as="script"><link rel="preload" href="/assets/js/158.d71d7a8e.js" as="script"><link rel="prefetch" href="/assets/js/10.80a35593.js"><link rel="prefetch" href="/assets/js/100.39f886a0.js"><link rel="prefetch" href="/assets/js/101.f0c4f3d3.js"><link rel="prefetch" href="/assets/js/102.a722af5a.js"><link rel="prefetch" href="/assets/js/103.506b5021.js"><link rel="prefetch" href="/assets/js/104.57763187.js"><link rel="prefetch" href="/assets/js/105.fd018c04.js"><link rel="prefetch" href="/assets/js/106.8e63314e.js"><link rel="prefetch" href="/assets/js/107.8f241345.js"><link rel="prefetch" href="/assets/js/108.d35aae0e.js"><link rel="prefetch" href="/assets/js/109.9392d338.js"><link rel="prefetch" href="/assets/js/11.b40295cb.js"><link rel="prefetch" href="/assets/js/110.83f2ffd2.js"><link rel="prefetch" href="/assets/js/111.ecbadf1f.js"><link rel="prefetch" href="/assets/js/112.d30a2720.js"><link rel="prefetch" href="/assets/js/113.2a97f9b3.js"><link rel="prefetch" href="/assets/js/114.86c9b9d9.js"><link rel="prefetch" href="/assets/js/115.4dd5f857.js"><link rel="prefetch" href="/assets/js/116.79ce6096.js"><link rel="prefetch" href="/assets/js/117.84a0191b.js"><link rel="prefetch" href="/assets/js/118.cc7d4332.js"><link rel="prefetch" href="/assets/js/119.1d4603a8.js"><link rel="prefetch" href="/assets/js/12.5cf6d2f2.js"><link rel="prefetch" href="/assets/js/120.4136bcc6.js"><link rel="prefetch" href="/assets/js/121.6d05184a.js"><link rel="prefetch" href="/assets/js/122.c2593099.js"><link rel="prefetch" href="/assets/js/123.62b38792.js"><link rel="prefetch" href="/assets/js/124.31113ad5.js"><link rel="prefetch" href="/assets/js/125.d55d473a.js"><link rel="prefetch" href="/assets/js/126.b20742e7.js"><link rel="prefetch" href="/assets/js/127.9880709b.js"><link rel="prefetch" href="/assets/js/128.f99bc35c.js"><link rel="prefetch" href="/assets/js/129.815235ac.js"><link rel="prefetch" href="/assets/js/13.b084c298.js"><link rel="prefetch" href="/assets/js/130.ddb2fc3a.js"><link rel="prefetch" href="/assets/js/131.e0b9ecdb.js"><link rel="prefetch" href="/assets/js/132.83eb98b7.js"><link rel="prefetch" href="/assets/js/133.905c8b32.js"><link rel="prefetch" href="/assets/js/134.dee2e5b7.js"><link rel="prefetch" href="/assets/js/135.7937670e.js"><link rel="prefetch" href="/assets/js/136.7265a771.js"><link rel="prefetch" href="/assets/js/137.4ae9e11f.js"><link rel="prefetch" href="/assets/js/138.5ca10fc6.js"><link rel="prefetch" href="/assets/js/139.08a57343.js"><link rel="prefetch" href="/assets/js/14.96102326.js"><link rel="prefetch" href="/assets/js/140.b4b0c198.js"><link rel="prefetch" href="/assets/js/141.600e674d.js"><link rel="prefetch" href="/assets/js/142.eab38a08.js"><link rel="prefetch" href="/assets/js/143.1f9576e1.js"><link rel="prefetch" href="/assets/js/144.9493322d.js"><link rel="prefetch" href="/assets/js/145.d97c4a9e.js"><link rel="prefetch" href="/assets/js/146.d906e7cc.js"><link rel="prefetch" href="/assets/js/147.791073b8.js"><link rel="prefetch" href="/assets/js/148.9659ba31.js"><link rel="prefetch" href="/assets/js/149.d7a41168.js"><link rel="prefetch" href="/assets/js/15.85bf89eb.js"><link rel="prefetch" href="/assets/js/150.dc4b447d.js"><link rel="prefetch" href="/assets/js/151.8d95f72e.js"><link rel="prefetch" href="/assets/js/152.418c5188.js"><link rel="prefetch" href="/assets/js/153.d429cea6.js"><link rel="prefetch" href="/assets/js/154.e303837e.js"><link rel="prefetch" href="/assets/js/155.36b53298.js"><link rel="prefetch" href="/assets/js/156.9cf80b6b.js"><link rel="prefetch" href="/assets/js/157.f1339ef9.js"><link rel="prefetch" href="/assets/js/159.c49bad7a.js"><link rel="prefetch" href="/assets/js/16.6088831f.js"><link rel="prefetch" href="/assets/js/160.86bf9b6c.js"><link rel="prefetch" href="/assets/js/161.bda36937.js"><link rel="prefetch" href="/assets/js/162.ab1a4693.js"><link rel="prefetch" href="/assets/js/163.314e534a.js"><link rel="prefetch" href="/assets/js/164.19757870.js"><link rel="prefetch" href="/assets/js/165.1607ea96.js"><link rel="prefetch" href="/assets/js/166.773e1acb.js"><link rel="prefetch" href="/assets/js/167.2789bddc.js"><link rel="prefetch" href="/assets/js/168.16f5f647.js"><link rel="prefetch" href="/assets/js/169.0bd9deb0.js"><link rel="prefetch" href="/assets/js/17.81308b9f.js"><link rel="prefetch" href="/assets/js/170.dbf28aac.js"><link rel="prefetch" href="/assets/js/171.043fc05f.js"><link rel="prefetch" href="/assets/js/172.6f3ba9a6.js"><link rel="prefetch" href="/assets/js/173.b9f9473b.js"><link rel="prefetch" href="/assets/js/174.7ffef574.js"><link rel="prefetch" href="/assets/js/175.4b6445c7.js"><link rel="prefetch" href="/assets/js/176.9fe99689.js"><link rel="prefetch" href="/assets/js/177.236d01b0.js"><link rel="prefetch" href="/assets/js/178.a563e1d0.js"><link rel="prefetch" href="/assets/js/179.18ad9330.js"><link rel="prefetch" href="/assets/js/18.a20cf2aa.js"><link rel="prefetch" href="/assets/js/180.8d42ab94.js"><link rel="prefetch" href="/assets/js/181.3b431f53.js"><link rel="prefetch" href="/assets/js/182.411370d1.js"><link rel="prefetch" href="/assets/js/183.1208058f.js"><link rel="prefetch" href="/assets/js/184.62f40035.js"><link rel="prefetch" href="/assets/js/185.2fa278d4.js"><link rel="prefetch" href="/assets/js/186.e1983553.js"><link rel="prefetch" href="/assets/js/187.d5b2da25.js"><link rel="prefetch" href="/assets/js/188.fee0a537.js"><link rel="prefetch" href="/assets/js/189.7eba223f.js"><link rel="prefetch" href="/assets/js/19.9667475a.js"><link rel="prefetch" href="/assets/js/190.48851103.js"><link rel="prefetch" href="/assets/js/191.3b731f2d.js"><link rel="prefetch" href="/assets/js/192.b57497ec.js"><link rel="prefetch" href="/assets/js/193.0f2228a7.js"><link rel="prefetch" href="/assets/js/194.3b24e70f.js"><link rel="prefetch" href="/assets/js/195.3e4bb7bd.js"><link rel="prefetch" href="/assets/js/196.f6a2f3cc.js"><link rel="prefetch" href="/assets/js/197.1377932a.js"><link rel="prefetch" href="/assets/js/198.f90bfa30.js"><link rel="prefetch" href="/assets/js/199.daf047dd.js"><link rel="prefetch" href="/assets/js/20.c3c8808d.js"><link rel="prefetch" href="/assets/js/200.e3af16f3.js"><link rel="prefetch" href="/assets/js/201.5ffd9d0d.js"><link rel="prefetch" href="/assets/js/202.49a57957.js"><link rel="prefetch" href="/assets/js/203.1ecbecab.js"><link rel="prefetch" href="/assets/js/204.fc781e20.js"><link rel="prefetch" href="/assets/js/205.b4f4e689.js"><link rel="prefetch" href="/assets/js/206.f206ae75.js"><link rel="prefetch" href="/assets/js/207.1026000d.js"><link rel="prefetch" href="/assets/js/208.5f5f92da.js"><link rel="prefetch" href="/assets/js/209.dce60666.js"><link rel="prefetch" href="/assets/js/21.4ea8a77c.js"><link rel="prefetch" href="/assets/js/210.4f285728.js"><link rel="prefetch" href="/assets/js/211.a94f7694.js"><link rel="prefetch" href="/assets/js/212.4bd32734.js"><link rel="prefetch" href="/assets/js/213.9607e78d.js"><link rel="prefetch" href="/assets/js/214.2dc9e7e2.js"><link rel="prefetch" href="/assets/js/215.9c4d29a2.js"><link rel="prefetch" href="/assets/js/216.b23f874f.js"><link rel="prefetch" href="/assets/js/217.0a1a89fa.js"><link rel="prefetch" href="/assets/js/218.bb85acce.js"><link rel="prefetch" href="/assets/js/219.bb784de9.js"><link rel="prefetch" href="/assets/js/22.cec2c78d.js"><link rel="prefetch" href="/assets/js/220.4d97258b.js"><link rel="prefetch" href="/assets/js/221.f5e2161e.js"><link rel="prefetch" href="/assets/js/222.a1408ba9.js"><link rel="prefetch" href="/assets/js/223.37d015ea.js"><link rel="prefetch" href="/assets/js/224.9440cdee.js"><link rel="prefetch" href="/assets/js/225.89a3ed94.js"><link rel="prefetch" href="/assets/js/226.3e361f00.js"><link rel="prefetch" href="/assets/js/227.43e62294.js"><link rel="prefetch" href="/assets/js/228.5f413b56.js"><link rel="prefetch" href="/assets/js/229.eacac93e.js"><link rel="prefetch" href="/assets/js/23.04c35184.js"><link rel="prefetch" href="/assets/js/230.ee4a4ccc.js"><link rel="prefetch" href="/assets/js/231.c887b250.js"><link rel="prefetch" href="/assets/js/232.76e74238.js"><link rel="prefetch" href="/assets/js/233.73b75f5a.js"><link rel="prefetch" href="/assets/js/234.e51f339c.js"><link rel="prefetch" href="/assets/js/235.ebeb4ec6.js"><link rel="prefetch" href="/assets/js/236.6d7d7f50.js"><link rel="prefetch" href="/assets/js/237.9b3ef7bb.js"><link rel="prefetch" href="/assets/js/238.e6d3aabb.js"><link rel="prefetch" href="/assets/js/239.b4fc8802.js"><link rel="prefetch" href="/assets/js/24.eca820f7.js"><link rel="prefetch" href="/assets/js/240.6946c084.js"><link rel="prefetch" href="/assets/js/241.a3cd5ced.js"><link rel="prefetch" href="/assets/js/242.d077a307.js"><link rel="prefetch" href="/assets/js/243.be36fdd9.js"><link rel="prefetch" href="/assets/js/244.415d00ac.js"><link rel="prefetch" href="/assets/js/245.46d7357e.js"><link rel="prefetch" href="/assets/js/246.f5a72b2f.js"><link rel="prefetch" href="/assets/js/247.19747d25.js"><link rel="prefetch" href="/assets/js/248.ee65c634.js"><link rel="prefetch" href="/assets/js/249.462d0d74.js"><link rel="prefetch" href="/assets/js/25.20930126.js"><link rel="prefetch" href="/assets/js/250.e8b59505.js"><link rel="prefetch" href="/assets/js/251.3dcd1b49.js"><link rel="prefetch" href="/assets/js/252.8dd11ce4.js"><link rel="prefetch" href="/assets/js/253.23362576.js"><link rel="prefetch" href="/assets/js/254.67058c79.js"><link rel="prefetch" href="/assets/js/255.b33a36fd.js"><link rel="prefetch" href="/assets/js/256.8aabebf6.js"><link rel="prefetch" href="/assets/js/257.b9a497ab.js"><link rel="prefetch" href="/assets/js/258.f0e2ba7c.js"><link rel="prefetch" href="/assets/js/259.900dbd98.js"><link rel="prefetch" href="/assets/js/26.43f8ae34.js"><link rel="prefetch" href="/assets/js/260.f0433ae0.js"><link rel="prefetch" href="/assets/js/261.70f6156a.js"><link rel="prefetch" href="/assets/js/262.ecfa17a0.js"><link rel="prefetch" href="/assets/js/263.c5ce191f.js"><link rel="prefetch" href="/assets/js/264.9899f1fb.js"><link rel="prefetch" href="/assets/js/265.d386187b.js"><link rel="prefetch" href="/assets/js/266.51c31c58.js"><link rel="prefetch" href="/assets/js/267.7db005e7.js"><link rel="prefetch" href="/assets/js/268.04626859.js"><link rel="prefetch" href="/assets/js/269.d083cb4a.js"><link rel="prefetch" href="/assets/js/27.4c49f73e.js"><link rel="prefetch" href="/assets/js/270.f299404a.js"><link rel="prefetch" href="/assets/js/271.9e49eaab.js"><link rel="prefetch" href="/assets/js/272.ceb950ed.js"><link rel="prefetch" href="/assets/js/273.1b0d09da.js"><link rel="prefetch" href="/assets/js/274.8b5820c6.js"><link rel="prefetch" href="/assets/js/275.23196b37.js"><link rel="prefetch" href="/assets/js/276.9fad3dfc.js"><link rel="prefetch" href="/assets/js/277.13d2e020.js"><link rel="prefetch" href="/assets/js/278.9a733595.js"><link rel="prefetch" href="/assets/js/279.75adae13.js"><link rel="prefetch" href="/assets/js/28.4755c7f9.js"><link rel="prefetch" href="/assets/js/280.12acfcc1.js"><link rel="prefetch" href="/assets/js/281.e7552ef4.js"><link rel="prefetch" href="/assets/js/282.9f5d99fa.js"><link rel="prefetch" href="/assets/js/283.41c20184.js"><link rel="prefetch" href="/assets/js/284.0fad2c05.js"><link rel="prefetch" href="/assets/js/285.cdf43ae7.js"><link rel="prefetch" href="/assets/js/286.d993326a.js"><link rel="prefetch" href="/assets/js/287.f6146ea4.js"><link rel="prefetch" href="/assets/js/288.33516f72.js"><link rel="prefetch" href="/assets/js/289.06c8f3f0.js"><link rel="prefetch" href="/assets/js/29.069cf689.js"><link rel="prefetch" href="/assets/js/290.d7414dff.js"><link rel="prefetch" href="/assets/js/291.a46316a2.js"><link rel="prefetch" href="/assets/js/292.35ccdf37.js"><link rel="prefetch" href="/assets/js/293.13cab923.js"><link rel="prefetch" href="/assets/js/294.8108d183.js"><link rel="prefetch" href="/assets/js/295.097b59c4.js"><link rel="prefetch" href="/assets/js/296.979ba522.js"><link rel="prefetch" href="/assets/js/297.fe44e024.js"><link rel="prefetch" href="/assets/js/298.eef0fcd7.js"><link rel="prefetch" href="/assets/js/299.40c8107a.js"><link rel="prefetch" href="/assets/js/30.f2a3f0c4.js"><link rel="prefetch" href="/assets/js/300.5727420d.js"><link rel="prefetch" href="/assets/js/301.50bd366c.js"><link rel="prefetch" href="/assets/js/302.7b6d2802.js"><link rel="prefetch" href="/assets/js/303.b5c6b9c2.js"><link rel="prefetch" href="/assets/js/304.dc052fc1.js"><link rel="prefetch" href="/assets/js/305.91aab185.js"><link rel="prefetch" href="/assets/js/306.f129c652.js"><link rel="prefetch" href="/assets/js/307.a5f00175.js"><link rel="prefetch" href="/assets/js/308.42f8217f.js"><link rel="prefetch" href="/assets/js/309.2929fcc7.js"><link rel="prefetch" href="/assets/js/31.7aaaf22f.js"><link rel="prefetch" href="/assets/js/310.516b2376.js"><link rel="prefetch" href="/assets/js/311.906d493c.js"><link rel="prefetch" href="/assets/js/312.c121b9dc.js"><link rel="prefetch" href="/assets/js/313.2db3a3bc.js"><link rel="prefetch" href="/assets/js/314.b6182cf6.js"><link rel="prefetch" href="/assets/js/315.2776e0bb.js"><link rel="prefetch" href="/assets/js/316.253a9866.js"><link rel="prefetch" href="/assets/js/317.151d3ea5.js"><link rel="prefetch" href="/assets/js/318.fd46503b.js"><link rel="prefetch" href="/assets/js/319.3f12ded1.js"><link rel="prefetch" href="/assets/js/32.047996cb.js"><link rel="prefetch" href="/assets/js/320.f798f9e5.js"><link rel="prefetch" href="/assets/js/321.e68fbabd.js"><link rel="prefetch" href="/assets/js/322.7a725b7b.js"><link rel="prefetch" href="/assets/js/323.ab25ae74.js"><link rel="prefetch" href="/assets/js/324.39702467.js"><link rel="prefetch" href="/assets/js/325.2146fbf0.js"><link rel="prefetch" href="/assets/js/326.39149066.js"><link rel="prefetch" href="/assets/js/327.a56495d4.js"><link rel="prefetch" href="/assets/js/328.27d2b495.js"><link rel="prefetch" href="/assets/js/329.a3747311.js"><link rel="prefetch" href="/assets/js/33.7e3852b2.js"><link rel="prefetch" href="/assets/js/330.275d7940.js"><link rel="prefetch" href="/assets/js/331.480508ee.js"><link rel="prefetch" href="/assets/js/332.20919351.js"><link rel="prefetch" href="/assets/js/333.b77a5dc0.js"><link rel="prefetch" href="/assets/js/334.a945711e.js"><link rel="prefetch" href="/assets/js/335.364e1c87.js"><link rel="prefetch" href="/assets/js/336.596a94bc.js"><link rel="prefetch" href="/assets/js/337.bf3d4a63.js"><link rel="prefetch" href="/assets/js/338.b09a9cff.js"><link rel="prefetch" href="/assets/js/339.44aea7ae.js"><link rel="prefetch" href="/assets/js/34.8b617bc2.js"><link rel="prefetch" href="/assets/js/340.a5d7bde5.js"><link rel="prefetch" href="/assets/js/341.c2eb533d.js"><link rel="prefetch" href="/assets/js/342.15ebc005.js"><link rel="prefetch" href="/assets/js/343.960b7508.js"><link rel="prefetch" href="/assets/js/344.11e52cee.js"><link rel="prefetch" href="/assets/js/345.b1b28d60.js"><link rel="prefetch" href="/assets/js/346.a6ed89b5.js"><link rel="prefetch" href="/assets/js/347.63a9d29a.js"><link rel="prefetch" href="/assets/js/348.dd9b78f9.js"><link rel="prefetch" href="/assets/js/349.bd94c361.js"><link rel="prefetch" href="/assets/js/35.0cbeeddf.js"><link rel="prefetch" href="/assets/js/350.87665dc2.js"><link rel="prefetch" href="/assets/js/351.1b7b9f3e.js"><link rel="prefetch" href="/assets/js/352.94e8df5e.js"><link rel="prefetch" href="/assets/js/353.1b6e7af9.js"><link rel="prefetch" href="/assets/js/354.871e7755.js"><link rel="prefetch" href="/assets/js/355.bdcf1715.js"><link rel="prefetch" href="/assets/js/356.322f548a.js"><link rel="prefetch" href="/assets/js/357.2f2aa0b8.js"><link rel="prefetch" href="/assets/js/358.d969cfe2.js"><link rel="prefetch" href="/assets/js/359.2022ef16.js"><link rel="prefetch" href="/assets/js/36.acba8a95.js"><link rel="prefetch" href="/assets/js/360.077d9617.js"><link rel="prefetch" href="/assets/js/361.ef50624a.js"><link rel="prefetch" href="/assets/js/362.93de4f29.js"><link rel="prefetch" href="/assets/js/363.fca50e3b.js"><link rel="prefetch" href="/assets/js/364.7e7d3ba9.js"><link rel="prefetch" href="/assets/js/365.8a6c9674.js"><link rel="prefetch" href="/assets/js/366.6a3771ff.js"><link rel="prefetch" href="/assets/js/367.800c979a.js"><link rel="prefetch" href="/assets/js/368.f393b087.js"><link rel="prefetch" href="/assets/js/369.ad587237.js"><link rel="prefetch" href="/assets/js/37.6741f71b.js"><link rel="prefetch" href="/assets/js/370.2dff61a5.js"><link rel="prefetch" href="/assets/js/371.73b96348.js"><link rel="prefetch" href="/assets/js/372.e7fd06c9.js"><link rel="prefetch" href="/assets/js/373.0426b78b.js"><link rel="prefetch" href="/assets/js/374.3ffbf7bd.js"><link rel="prefetch" href="/assets/js/375.ee4b4f01.js"><link rel="prefetch" href="/assets/js/376.795ff584.js"><link rel="prefetch" href="/assets/js/377.c86dbefa.js"><link rel="prefetch" href="/assets/js/378.0ff0e64b.js"><link rel="prefetch" href="/assets/js/379.0b7d4a09.js"><link rel="prefetch" href="/assets/js/38.872948ca.js"><link rel="prefetch" href="/assets/js/380.1ccf60b1.js"><link rel="prefetch" href="/assets/js/381.2c473e49.js"><link rel="prefetch" href="/assets/js/382.74854259.js"><link rel="prefetch" href="/assets/js/383.380b26cd.js"><link rel="prefetch" href="/assets/js/384.d0e7b164.js"><link rel="prefetch" href="/assets/js/385.42d926b6.js"><link rel="prefetch" href="/assets/js/386.e83f4899.js"><link rel="prefetch" href="/assets/js/387.95032326.js"><link rel="prefetch" href="/assets/js/388.fa8f316d.js"><link rel="prefetch" href="/assets/js/389.ec4b5c1a.js"><link rel="prefetch" href="/assets/js/39.4c7ca432.js"><link rel="prefetch" href="/assets/js/390.dc0b7850.js"><link rel="prefetch" href="/assets/js/391.c6fb3694.js"><link rel="prefetch" href="/assets/js/392.a4d0a2e5.js"><link rel="prefetch" href="/assets/js/393.97737dd9.js"><link rel="prefetch" href="/assets/js/394.29e8d981.js"><link rel="prefetch" href="/assets/js/395.1c15eb16.js"><link rel="prefetch" href="/assets/js/396.808e0cd2.js"><link rel="prefetch" href="/assets/js/397.a90a815e.js"><link rel="prefetch" href="/assets/js/398.e3b312e5.js"><link rel="prefetch" href="/assets/js/399.664d6571.js"><link rel="prefetch" href="/assets/js/4.99e5432f.js"><link rel="prefetch" href="/assets/js/40.8b1b1448.js"><link rel="prefetch" href="/assets/js/400.ee648749.js"><link rel="prefetch" href="/assets/js/401.75eac689.js"><link rel="prefetch" href="/assets/js/402.2d1d459a.js"><link rel="prefetch" href="/assets/js/403.946b9341.js"><link rel="prefetch" href="/assets/js/404.4362745d.js"><link rel="prefetch" href="/assets/js/405.ad816b3a.js"><link rel="prefetch" href="/assets/js/406.b77cd48b.js"><link rel="prefetch" href="/assets/js/407.090539ef.js"><link rel="prefetch" href="/assets/js/408.1abe69f6.js"><link rel="prefetch" href="/assets/js/409.c40daa26.js"><link rel="prefetch" href="/assets/js/41.32e47875.js"><link rel="prefetch" href="/assets/js/410.f50d6bdb.js"><link rel="prefetch" href="/assets/js/411.5ff61183.js"><link rel="prefetch" href="/assets/js/412.0e5dc4dd.js"><link rel="prefetch" href="/assets/js/413.b645444c.js"><link rel="prefetch" href="/assets/js/414.a3696d87.js"><link rel="prefetch" href="/assets/js/415.345fd8d2.js"><link rel="prefetch" href="/assets/js/416.d48c69de.js"><link rel="prefetch" href="/assets/js/417.48df988f.js"><link rel="prefetch" href="/assets/js/418.decd8d51.js"><link rel="prefetch" href="/assets/js/419.f7758868.js"><link rel="prefetch" href="/assets/js/42.9a545fc9.js"><link rel="prefetch" href="/assets/js/420.d781a75e.js"><link rel="prefetch" href="/assets/js/421.7d09b20a.js"><link rel="prefetch" href="/assets/js/422.76ccb9f0.js"><link rel="prefetch" href="/assets/js/423.0e459de7.js"><link rel="prefetch" href="/assets/js/424.378823bc.js"><link rel="prefetch" href="/assets/js/425.4a8621b8.js"><link rel="prefetch" href="/assets/js/426.84f5273f.js"><link rel="prefetch" href="/assets/js/427.35337a85.js"><link rel="prefetch" href="/assets/js/428.ac53d000.js"><link rel="prefetch" href="/assets/js/429.31aa3c27.js"><link rel="prefetch" href="/assets/js/43.e3241155.js"><link rel="prefetch" href="/assets/js/430.f06156c6.js"><link rel="prefetch" href="/assets/js/431.e36da030.js"><link rel="prefetch" href="/assets/js/432.9966e328.js"><link rel="prefetch" href="/assets/js/433.91036833.js"><link rel="prefetch" href="/assets/js/434.5fecac87.js"><link rel="prefetch" href="/assets/js/435.6aa265c5.js"><link rel="prefetch" href="/assets/js/436.1d2ed591.js"><link rel="prefetch" href="/assets/js/437.d4ffb97d.js"><link rel="prefetch" href="/assets/js/438.9bc1c259.js"><link rel="prefetch" href="/assets/js/439.eb70778f.js"><link rel="prefetch" href="/assets/js/44.5c8e47a4.js"><link rel="prefetch" href="/assets/js/440.0d1afe9a.js"><link rel="prefetch" href="/assets/js/441.ea1ca320.js"><link rel="prefetch" href="/assets/js/442.2e8a7273.js"><link rel="prefetch" href="/assets/js/443.304263cb.js"><link rel="prefetch" href="/assets/js/444.e6a2f559.js"><link rel="prefetch" href="/assets/js/445.85c966a7.js"><link rel="prefetch" href="/assets/js/446.0f0ad473.js"><link rel="prefetch" href="/assets/js/447.db9e3059.js"><link rel="prefetch" href="/assets/js/448.e164d193.js"><link rel="prefetch" href="/assets/js/449.d837f327.js"><link rel="prefetch" href="/assets/js/45.0d3e1654.js"><link rel="prefetch" href="/assets/js/450.b5e27162.js"><link rel="prefetch" href="/assets/js/451.912eea61.js"><link rel="prefetch" href="/assets/js/452.48899981.js"><link rel="prefetch" href="/assets/js/453.7ae7e168.js"><link rel="prefetch" href="/assets/js/454.7f2fd0bc.js"><link rel="prefetch" href="/assets/js/455.5e5f9203.js"><link rel="prefetch" href="/assets/js/456.d40ccb43.js"><link rel="prefetch" href="/assets/js/457.0f67cf83.js"><link rel="prefetch" href="/assets/js/458.50b72d51.js"><link rel="prefetch" href="/assets/js/459.97db0e0d.js"><link rel="prefetch" href="/assets/js/46.733d682a.js"><link rel="prefetch" href="/assets/js/460.53e1416a.js"><link rel="prefetch" href="/assets/js/461.0ed7f49c.js"><link rel="prefetch" href="/assets/js/462.29a59885.js"><link rel="prefetch" href="/assets/js/463.338fbefa.js"><link rel="prefetch" href="/assets/js/464.7ba4014e.js"><link rel="prefetch" href="/assets/js/465.1e819f78.js"><link rel="prefetch" href="/assets/js/466.49848a3f.js"><link rel="prefetch" href="/assets/js/467.9795c650.js"><link rel="prefetch" href="/assets/js/468.6d5fe511.js"><link rel="prefetch" href="/assets/js/469.7f7dc954.js"><link rel="prefetch" href="/assets/js/47.7ded670f.js"><link rel="prefetch" href="/assets/js/470.b332d795.js"><link rel="prefetch" href="/assets/js/471.5331ec3d.js"><link rel="prefetch" href="/assets/js/472.5f71339d.js"><link rel="prefetch" href="/assets/js/473.c80a6948.js"><link rel="prefetch" href="/assets/js/474.6dbcb355.js"><link rel="prefetch" href="/assets/js/475.6a15f050.js"><link rel="prefetch" href="/assets/js/476.3843e81a.js"><link rel="prefetch" href="/assets/js/477.c039d005.js"><link rel="prefetch" href="/assets/js/478.840b628c.js"><link rel="prefetch" href="/assets/js/479.0c2e5b84.js"><link rel="prefetch" href="/assets/js/48.d6e61980.js"><link rel="prefetch" href="/assets/js/480.623a5aa9.js"><link rel="prefetch" href="/assets/js/481.567e307e.js"><link rel="prefetch" href="/assets/js/482.967b8baa.js"><link rel="prefetch" href="/assets/js/483.6237aef5.js"><link rel="prefetch" href="/assets/js/484.fac62c57.js"><link rel="prefetch" href="/assets/js/485.ce480c6e.js"><link rel="prefetch" href="/assets/js/486.88052326.js"><link rel="prefetch" href="/assets/js/487.3990c45a.js"><link rel="prefetch" href="/assets/js/488.625de369.js"><link rel="prefetch" href="/assets/js/489.9ba35403.js"><link rel="prefetch" href="/assets/js/49.3d53d16d.js"><link rel="prefetch" href="/assets/js/490.1ab37035.js"><link rel="prefetch" href="/assets/js/491.e1b0407f.js"><link rel="prefetch" href="/assets/js/492.92ee61c8.js"><link rel="prefetch" href="/assets/js/493.2ffeae09.js"><link rel="prefetch" href="/assets/js/494.abdd341d.js"><link rel="prefetch" href="/assets/js/495.6a60193b.js"><link rel="prefetch" href="/assets/js/496.74ae2f01.js"><link rel="prefetch" href="/assets/js/497.2e7c2448.js"><link rel="prefetch" href="/assets/js/498.06c31ba6.js"><link rel="prefetch" href="/assets/js/499.844a3d5a.js"><link rel="prefetch" href="/assets/js/5.2c66b9cb.js"><link rel="prefetch" href="/assets/js/50.84aee54d.js"><link rel="prefetch" href="/assets/js/500.588c9058.js"><link rel="prefetch" href="/assets/js/501.f8e6401a.js"><link rel="prefetch" href="/assets/js/502.e01619c5.js"><link rel="prefetch" href="/assets/js/503.2d39a7b3.js"><link rel="prefetch" href="/assets/js/504.29df9bd0.js"><link rel="prefetch" href="/assets/js/505.bf3f01b7.js"><link rel="prefetch" href="/assets/js/506.40be9cfb.js"><link rel="prefetch" href="/assets/js/507.2e4be034.js"><link rel="prefetch" href="/assets/js/508.9428cb66.js"><link rel="prefetch" href="/assets/js/509.348fb99e.js"><link rel="prefetch" href="/assets/js/51.7bee7688.js"><link rel="prefetch" href="/assets/js/510.915db7c6.js"><link rel="prefetch" href="/assets/js/511.ce3248a7.js"><link rel="prefetch" href="/assets/js/512.8cd57842.js"><link rel="prefetch" href="/assets/js/513.024de1d4.js"><link rel="prefetch" href="/assets/js/514.105ca9cd.js"><link rel="prefetch" href="/assets/js/515.6099749d.js"><link rel="prefetch" href="/assets/js/516.36e3e79c.js"><link rel="prefetch" href="/assets/js/517.cc27ee13.js"><link rel="prefetch" href="/assets/js/518.fb85f210.js"><link rel="prefetch" href="/assets/js/519.eae02e67.js"><link rel="prefetch" href="/assets/js/52.6d51118b.js"><link rel="prefetch" href="/assets/js/520.b2fe1484.js"><link rel="prefetch" href="/assets/js/521.42e2bea2.js"><link rel="prefetch" href="/assets/js/522.e04eb229.js"><link rel="prefetch" href="/assets/js/523.c7da0090.js"><link rel="prefetch" href="/assets/js/524.ce3de342.js"><link rel="prefetch" href="/assets/js/525.ae5041ab.js"><link rel="prefetch" href="/assets/js/53.6d9f67be.js"><link rel="prefetch" href="/assets/js/54.6a8f5546.js"><link rel="prefetch" href="/assets/js/55.f008d2fb.js"><link rel="prefetch" href="/assets/js/56.29e949ab.js"><link rel="prefetch" href="/assets/js/57.c53c39b8.js"><link rel="prefetch" href="/assets/js/58.82608a79.js"><link rel="prefetch" href="/assets/js/59.558bfbc3.js"><link rel="prefetch" href="/assets/js/6.db8c6d5d.js"><link rel="prefetch" href="/assets/js/60.02c808e3.js"><link rel="prefetch" href="/assets/js/61.32b5d473.js"><link rel="prefetch" href="/assets/js/62.341cae24.js"><link rel="prefetch" href="/assets/js/63.b598f424.js"><link rel="prefetch" href="/assets/js/64.e30d770e.js"><link rel="prefetch" href="/assets/js/65.28e5bacf.js"><link rel="prefetch" href="/assets/js/66.0557eb73.js"><link rel="prefetch" href="/assets/js/67.050c32a8.js"><link rel="prefetch" href="/assets/js/68.775d3316.js"><link rel="prefetch" href="/assets/js/69.aa6adcab.js"><link rel="prefetch" href="/assets/js/7.c4a32f95.js"><link rel="prefetch" href="/assets/js/70.844ce1c8.js"><link rel="prefetch" href="/assets/js/71.759eae1c.js"><link rel="prefetch" href="/assets/js/72.3c3ef83b.js"><link rel="prefetch" href="/assets/js/73.4694f012.js"><link rel="prefetch" href="/assets/js/74.feb92d1d.js"><link rel="prefetch" href="/assets/js/75.14da8734.js"><link rel="prefetch" href="/assets/js/76.a0c63761.js"><link rel="prefetch" href="/assets/js/77.2001f0a0.js"><link rel="prefetch" href="/assets/js/78.b250d25e.js"><link rel="prefetch" href="/assets/js/79.c46807c8.js"><link rel="prefetch" href="/assets/js/8.0d7c7c38.js"><link rel="prefetch" href="/assets/js/80.3a3a9451.js"><link rel="prefetch" href="/assets/js/81.ff75cbfb.js"><link rel="prefetch" href="/assets/js/82.a1a40237.js"><link rel="prefetch" href="/assets/js/83.4a49be4e.js"><link rel="prefetch" href="/assets/js/84.845ccb5e.js"><link rel="prefetch" href="/assets/js/85.d9ead868.js"><link rel="prefetch" href="/assets/js/86.98029c6c.js"><link rel="prefetch" href="/assets/js/87.781b02d0.js"><link rel="prefetch" href="/assets/js/88.14b79cff.js"><link rel="prefetch" href="/assets/js/89.530d5cf7.js"><link rel="prefetch" href="/assets/js/9.79f3dceb.js"><link rel="prefetch" href="/assets/js/90.a474cb71.js"><link rel="prefetch" href="/assets/js/91.73716c27.js"><link rel="prefetch" href="/assets/js/92.552b5a0d.js"><link rel="prefetch" href="/assets/js/93.392ece00.js"><link rel="prefetch" href="/assets/js/94.2af538c0.js"><link rel="prefetch" href="/assets/js/95.4f851b6b.js"><link rel="prefetch" href="/assets/js/96.4ed79b6a.js"><link rel="prefetch" href="/assets/js/97.5fe20bcf.js"><link rel="prefetch" href="/assets/js/98.f0b08288.js"><link rel="prefetch" href="/assets/js/99.6d805394.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.ac6383e3.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.679f71b6.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.0fe82a0a.js" defer></script><script src="/assets/js/3.80bccc99.js" defer></script><script src="/assets/js/158.d71d7a8e.js" defer></script> |
| </body> |
| </html> |