| <!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.180d01d9.js" as="script"><link rel="preload" href="/assets/js/3.80bccc99.js" as="script"><link rel="preload" href="/assets/js/115.debf1614.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/101.3c78fabe.js"><link rel="prefetch" href="/assets/js/102.37515932.js"><link rel="prefetch" href="/assets/js/103.011a72fd.js"><link rel="prefetch" href="/assets/js/104.7982a489.js"><link rel="prefetch" href="/assets/js/105.79aa611f.js"><link rel="prefetch" href="/assets/js/106.0caed9cb.js"><link rel="prefetch" href="/assets/js/107.6ba60b87.js"><link rel="prefetch" href="/assets/js/108.4723ff13.js"><link rel="prefetch" href="/assets/js/109.2a4af354.js"><link rel="prefetch" href="/assets/js/11.d8e8f747.js"><link rel="prefetch" href="/assets/js/110.deffb480.js"><link rel="prefetch" href="/assets/js/111.30347dd7.js"><link rel="prefetch" href="/assets/js/112.2eee35a9.js"><link rel="prefetch" href="/assets/js/113.c0799431.js"><link rel="prefetch" href="/assets/js/114.b18c6e29.js"><link rel="prefetch" href="/assets/js/116.79ce6096.js"><link rel="prefetch" href="/assets/js/117.9d5b9ad6.js"><link rel="prefetch" href="/assets/js/118.251519be.js"><link rel="prefetch" href="/assets/js/119.38a60ca3.js"><link rel="prefetch" href="/assets/js/12.f8574d3f.js"><link rel="prefetch" href="/assets/js/120.5c90ad93.js"><link rel="prefetch" href="/assets/js/121.f4289f72.js"><link rel="prefetch" href="/assets/js/122.1c822ac1.js"><link rel="prefetch" href="/assets/js/123.b7b0323c.js"><link rel="prefetch" href="/assets/js/124.0fa0a704.js"><link rel="prefetch" href="/assets/js/125.b005fc6b.js"><link rel="prefetch" href="/assets/js/126.3bbbad7d.js"><link rel="prefetch" href="/assets/js/127.393a9d4f.js"><link rel="prefetch" href="/assets/js/128.f99bc35c.js"><link rel="prefetch" href="/assets/js/129.cf617c22.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.e4ec79f6.js"><link rel="prefetch" href="/assets/js/133.4ea22c66.js"><link rel="prefetch" href="/assets/js/134.8e63839c.js"><link rel="prefetch" href="/assets/js/135.cf279fa0.js"><link rel="prefetch" href="/assets/js/136.bdc1a13f.js"><link rel="prefetch" href="/assets/js/137.e02bf420.js"><link rel="prefetch" href="/assets/js/138.5ca10fc6.js"><link rel="prefetch" href="/assets/js/139.25195c53.js"><link rel="prefetch" href="/assets/js/14.bdb05f70.js"><link rel="prefetch" href="/assets/js/140.48f8dce7.js"><link rel="prefetch" href="/assets/js/141.8af4bc46.js"><link rel="prefetch" href="/assets/js/142.c614b9c7.js"><link rel="prefetch" href="/assets/js/143.b49d50ea.js"><link rel="prefetch" href="/assets/js/144.9232bb52.js"><link rel="prefetch" href="/assets/js/145.e82176bd.js"><link rel="prefetch" href="/assets/js/146.d906e7cc.js"><link rel="prefetch" href="/assets/js/147.aa9addae.js"><link rel="prefetch" href="/assets/js/148.d21d7f4c.js"><link rel="prefetch" href="/assets/js/149.123490f8.js"><link rel="prefetch" href="/assets/js/15.0fca6080.js"><link rel="prefetch" href="/assets/js/150.fa33e60d.js"><link rel="prefetch" href="/assets/js/151.8c9717da.js"><link rel="prefetch" href="/assets/js/152.b0344944.js"><link rel="prefetch" href="/assets/js/153.a769d665.js"><link rel="prefetch" href="/assets/js/154.00eab60a.js"><link rel="prefetch" href="/assets/js/155.27040aba.js"><link rel="prefetch" href="/assets/js/156.9dfe9bcd.js"><link rel="prefetch" href="/assets/js/157.04dc052c.js"><link rel="prefetch" href="/assets/js/158.34c42aeb.js"><link rel="prefetch" href="/assets/js/159.cb580080.js"><link rel="prefetch" href="/assets/js/16.6088831f.js"><link rel="prefetch" href="/assets/js/160.1a0712bf.js"><link rel="prefetch" href="/assets/js/161.9220b7d6.js"><link rel="prefetch" href="/assets/js/162.fd3eadf3.js"><link rel="prefetch" href="/assets/js/163.7d0abfa9.js"><link rel="prefetch" href="/assets/js/164.d6765642.js"><link rel="prefetch" href="/assets/js/165.2ac725b7.js"><link rel="prefetch" href="/assets/js/166.77d622fb.js"><link rel="prefetch" href="/assets/js/167.48cb5261.js"><link rel="prefetch" href="/assets/js/168.7d0a64ff.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.f7383ec5.js"><link rel="prefetch" href="/assets/js/171.5dea7b78.js"><link rel="prefetch" href="/assets/js/172.c4d69e52.js"><link rel="prefetch" href="/assets/js/173.7b3813ef.js"><link rel="prefetch" href="/assets/js/174.e6e9e0c2.js"><link rel="prefetch" href="/assets/js/175.4117bbca.js"><link rel="prefetch" href="/assets/js/176.c8a65036.js"><link rel="prefetch" href="/assets/js/177.e3734f97.js"><link rel="prefetch" href="/assets/js/178.80164d9b.js"><link rel="prefetch" href="/assets/js/179.8a55a461.js"><link rel="prefetch" href="/assets/js/18.39a8fcd1.js"><link rel="prefetch" href="/assets/js/180.50cc533e.js"><link rel="prefetch" href="/assets/js/181.b20a8567.js"><link rel="prefetch" href="/assets/js/182.727c04fb.js"><link rel="prefetch" href="/assets/js/183.ea978fdc.js"><link rel="prefetch" href="/assets/js/184.060babb9.js"><link rel="prefetch" href="/assets/js/185.e75fb32f.js"><link rel="prefetch" href="/assets/js/186.afd970c1.js"><link rel="prefetch" href="/assets/js/187.bd5f8aae.js"><link rel="prefetch" href="/assets/js/188.0e3fd7e5.js"><link rel="prefetch" href="/assets/js/189.7eba223f.js"><link rel="prefetch" href="/assets/js/19.6c92832e.js"><link rel="prefetch" href="/assets/js/190.4651ae89.js"><link rel="prefetch" href="/assets/js/191.e9cd05c8.js"><link rel="prefetch" href="/assets/js/192.daed6250.js"><link rel="prefetch" href="/assets/js/193.464e27ed.js"><link rel="prefetch" href="/assets/js/194.5676de40.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/198.45f55157.js"><link rel="prefetch" href="/assets/js/199.24aba8b4.js"><link rel="prefetch" href="/assets/js/20.b7ce495c.js"><link rel="prefetch" href="/assets/js/200.8687a88a.js"><link rel="prefetch" href="/assets/js/201.fe9116ec.js"><link rel="prefetch" href="/assets/js/202.052f6433.js"><link rel="prefetch" href="/assets/js/203.4a6e39f1.js"><link rel="prefetch" href="/assets/js/204.3d563a59.js"><link rel="prefetch" href="/assets/js/205.1160e104.js"><link rel="prefetch" href="/assets/js/206.97b91108.js"><link rel="prefetch" href="/assets/js/207.c80b12cc.js"><link rel="prefetch" href="/assets/js/208.9b5d5cc8.js"><link rel="prefetch" href="/assets/js/209.ac5da696.js"><link rel="prefetch" href="/assets/js/21.4ea8a77c.js"><link rel="prefetch" href="/assets/js/210.66af6fa9.js"><link rel="prefetch" href="/assets/js/211.f9cfbdef.js"><link rel="prefetch" href="/assets/js/212.4ac4da6b.js"><link rel="prefetch" href="/assets/js/213.cc598362.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/217.3397c1e0.js"><link rel="prefetch" href="/assets/js/218.bb85acce.js"><link rel="prefetch" href="/assets/js/219.4365ec9c.js"><link rel="prefetch" href="/assets/js/22.b7f6fef5.js"><link rel="prefetch" href="/assets/js/220.682d5822.js"><link rel="prefetch" href="/assets/js/221.d370a4ec.js"><link rel="prefetch" href="/assets/js/222.a1408ba9.js"><link rel="prefetch" href="/assets/js/223.7b5c0a52.js"><link rel="prefetch" href="/assets/js/224.24593aad.js"><link rel="prefetch" href="/assets/js/225.f2bab70d.js"><link rel="prefetch" href="/assets/js/226.797af735.js"><link rel="prefetch" href="/assets/js/227.4da2beda.js"><link rel="prefetch" href="/assets/js/228.5f413b56.js"><link rel="prefetch" href="/assets/js/229.4ae34924.js"><link rel="prefetch" href="/assets/js/23.d6247dc8.js"><link rel="prefetch" href="/assets/js/230.ba26d1ad.js"><link rel="prefetch" href="/assets/js/231.60335583.js"><link rel="prefetch" href="/assets/js/232.0814df8e.js"><link rel="prefetch" href="/assets/js/233.c37da0c1.js"><link rel="prefetch" href="/assets/js/234.2272a43d.js"><link rel="prefetch" href="/assets/js/235.ebeb4ec6.js"><link rel="prefetch" href="/assets/js/236.5ce1c6d1.js"><link rel="prefetch" href="/assets/js/237.fa1d8a1d.js"><link rel="prefetch" href="/assets/js/238.ec71fa9d.js"><link rel="prefetch" href="/assets/js/239.b4fc8802.js"><link rel="prefetch" href="/assets/js/24.e0e8d4fd.js"><link rel="prefetch" href="/assets/js/240.d556e0f7.js"><link rel="prefetch" href="/assets/js/241.c869c7ff.js"><link rel="prefetch" href="/assets/js/242.fa0b27f5.js"><link rel="prefetch" href="/assets/js/243.fb61381c.js"><link rel="prefetch" href="/assets/js/244.a1351a9d.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.cb9a3ad5.js"><link rel="prefetch" href="/assets/js/249.c0d83a33.js"><link rel="prefetch" href="/assets/js/25.65867e2d.js"><link rel="prefetch" href="/assets/js/250.b87f9db7.js"><link rel="prefetch" href="/assets/js/251.e80e5746.js"><link rel="prefetch" href="/assets/js/252.b6a2d33e.js"><link rel="prefetch" href="/assets/js/253.07764dda.js"><link rel="prefetch" href="/assets/js/254.fb652588.js"><link rel="prefetch" href="/assets/js/255.39c08c69.js"><link rel="prefetch" href="/assets/js/256.8aabebf6.js"><link rel="prefetch" href="/assets/js/257.b8171800.js"><link rel="prefetch" href="/assets/js/258.7e9d00ab.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/260.97f41c1a.js"><link rel="prefetch" href="/assets/js/261.e93782f5.js"><link rel="prefetch" href="/assets/js/262.2e6c30f2.js"><link rel="prefetch" href="/assets/js/263.c5ce191f.js"><link rel="prefetch" href="/assets/js/264.7b5aeca6.js"><link rel="prefetch" href="/assets/js/265.5324a8e0.js"><link rel="prefetch" href="/assets/js/266.0c18e838.js"><link rel="prefetch" href="/assets/js/267.7eb073ed.js"><link rel="prefetch" href="/assets/js/268.579cc048.js"><link rel="prefetch" href="/assets/js/269.700494f3.js"><link rel="prefetch" href="/assets/js/27.35c06c5f.js"><link rel="prefetch" href="/assets/js/270.12c92935.js"><link rel="prefetch" href="/assets/js/271.708ed233.js"><link rel="prefetch" href="/assets/js/272.baead764.js"><link rel="prefetch" href="/assets/js/273.9d2a702e.js"><link rel="prefetch" href="/assets/js/274.460ff581.js"><link rel="prefetch" href="/assets/js/275.fbabaf72.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/278.30bd39fa.js"><link rel="prefetch" href="/assets/js/279.79f09838.js"><link rel="prefetch" href="/assets/js/28.dc177353.js"><link rel="prefetch" href="/assets/js/280.04190844.js"><link rel="prefetch" href="/assets/js/281.4bcc6cbc.js"><link rel="prefetch" href="/assets/js/282.c75baace.js"><link rel="prefetch" href="/assets/js/283.9e3878aa.js"><link rel="prefetch" href="/assets/js/284.0fad2c05.js"><link rel="prefetch" href="/assets/js/285.29463598.js"><link rel="prefetch" href="/assets/js/286.19542c3a.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/289.9d717a63.js"><link rel="prefetch" href="/assets/js/29.41efec7e.js"><link rel="prefetch" href="/assets/js/290.20bd76d8.js"><link rel="prefetch" href="/assets/js/291.7d6cb2ea.js"><link rel="prefetch" href="/assets/js/292.f3523127.js"><link rel="prefetch" href="/assets/js/293.e1c6922e.js"><link rel="prefetch" href="/assets/js/294.281e3acf.js"><link rel="prefetch" href="/assets/js/295.20f2357a.js"><link rel="prefetch" href="/assets/js/296.5f2858cb.js"><link rel="prefetch" href="/assets/js/297.baf23e66.js"><link rel="prefetch" href="/assets/js/298.fed91807.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/300.4425ae8c.js"><link rel="prefetch" href="/assets/js/301.7c341f63.js"><link rel="prefetch" href="/assets/js/302.8f3e48fd.js"><link rel="prefetch" href="/assets/js/303.339049dc.js"><link rel="prefetch" href="/assets/js/304.042b56b8.js"><link rel="prefetch" href="/assets/js/305.aa067d8b.js"><link rel="prefetch" href="/assets/js/306.f5fa1aa8.js"><link rel="prefetch" href="/assets/js/307.a5f00175.js"><link rel="prefetch" href="/assets/js/308.b68beb49.js"><link rel="prefetch" href="/assets/js/309.288abe02.js"><link rel="prefetch" href="/assets/js/31.bcb345d3.js"><link rel="prefetch" href="/assets/js/310.ef444659.js"><link rel="prefetch" href="/assets/js/311.43f64bac.js"><link rel="prefetch" href="/assets/js/312.c121b9dc.js"><link rel="prefetch" href="/assets/js/313.3ddf2e7b.js"><link rel="prefetch" href="/assets/js/314.b29ef147.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/317.87ac4d89.js"><link rel="prefetch" href="/assets/js/318.95d6cf37.js"><link rel="prefetch" href="/assets/js/319.4e4fd314.js"><link rel="prefetch" href="/assets/js/32.6d5895b9.js"><link rel="prefetch" href="/assets/js/320.13105b81.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.d665fbcc.js"><link rel="prefetch" href="/assets/js/324.85c2cc6a.js"><link rel="prefetch" href="/assets/js/325.b245f89e.js"><link rel="prefetch" href="/assets/js/326.f01ee63d.js"><link rel="prefetch" href="/assets/js/327.457712e2.js"><link rel="prefetch" href="/assets/js/328.f8fb15c5.js"><link rel="prefetch" href="/assets/js/329.0f0afbf2.js"><link rel="prefetch" href="/assets/js/33.15359fa6.js"><link rel="prefetch" href="/assets/js/330.275d7940.js"><link rel="prefetch" href="/assets/js/331.f6975143.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/335.7a34f5f7.js"><link rel="prefetch" href="/assets/js/336.75f32bdd.js"><link rel="prefetch" href="/assets/js/337.65b9e202.js"><link rel="prefetch" href="/assets/js/338.4e3e0237.js"><link rel="prefetch" href="/assets/js/339.b3b87712.js"><link rel="prefetch" href="/assets/js/34.47446ffe.js"><link rel="prefetch" href="/assets/js/340.9c330a3d.js"><link rel="prefetch" href="/assets/js/341.2b4a26ad.js"><link rel="prefetch" href="/assets/js/342.39fc6bdf.js"><link rel="prefetch" href="/assets/js/343.960b7508.js"><link rel="prefetch" href="/assets/js/344.2199c693.js"><link rel="prefetch" href="/assets/js/345.eea3f5bd.js"><link rel="prefetch" href="/assets/js/346.cced6d70.js"><link rel="prefetch" href="/assets/js/347.eb736633.js"><link rel="prefetch" href="/assets/js/348.56689d2d.js"><link rel="prefetch" href="/assets/js/349.d8280ba5.js"><link rel="prefetch" href="/assets/js/35.0cbeeddf.js"><link rel="prefetch" href="/assets/js/350.084e0aa3.js"><link rel="prefetch" href="/assets/js/351.d4476825.js"><link rel="prefetch" href="/assets/js/352.8726fe8d.js"><link rel="prefetch" href="/assets/js/353.59f38cac.js"><link rel="prefetch" href="/assets/js/354.e14d3894.js"><link rel="prefetch" href="/assets/js/355.bc1a4e09.js"><link rel="prefetch" href="/assets/js/356.ea573ec9.js"><link rel="prefetch" href="/assets/js/357.9439f6c0.js"><link rel="prefetch" href="/assets/js/358.bb7a2ce9.js"><link rel="prefetch" href="/assets/js/359.7f3ae50b.js"><link rel="prefetch" href="/assets/js/36.28c58a40.js"><link rel="prefetch" href="/assets/js/360.97401cea.js"><link rel="prefetch" href="/assets/js/361.e7b9dfb3.js"><link rel="prefetch" href="/assets/js/362.93de4f29.js"><link rel="prefetch" href="/assets/js/363.6d929781.js"><link rel="prefetch" href="/assets/js/364.48b922ef.js"><link rel="prefetch" href="/assets/js/365.29a1db61.js"><link rel="prefetch" href="/assets/js/366.a61d94c7.js"><link rel="prefetch" href="/assets/js/367.8f66cb9f.js"><link rel="prefetch" href="/assets/js/368.000b14b0.js"><link rel="prefetch" href="/assets/js/369.a2906c8a.js"><link rel="prefetch" href="/assets/js/37.2ee17004.js"><link rel="prefetch" href="/assets/js/370.7f8e7cae.js"><link rel="prefetch" href="/assets/js/371.cdc80fbe.js"><link rel="prefetch" href="/assets/js/372.6cc1d252.js"><link rel="prefetch" href="/assets/js/373.37429649.js"><link rel="prefetch" href="/assets/js/374.5ae3d5b1.js"><link rel="prefetch" href="/assets/js/375.797a45dd.js"><link rel="prefetch" href="/assets/js/376.920a5253.js"><link rel="prefetch" href="/assets/js/377.dec17054.js"><link rel="prefetch" href="/assets/js/378.a7a5e303.js"><link rel="prefetch" href="/assets/js/379.f1e6e491.js"><link rel="prefetch" href="/assets/js/38.1997b617.js"><link rel="prefetch" href="/assets/js/380.e1bf8eb0.js"><link rel="prefetch" href="/assets/js/381.738b140e.js"><link rel="prefetch" href="/assets/js/382.9e38bed5.js"><link rel="prefetch" href="/assets/js/383.ce2714c4.js"><link rel="prefetch" href="/assets/js/384.ed10c711.js"><link rel="prefetch" href="/assets/js/385.d8b4589c.js"><link rel="prefetch" href="/assets/js/386.31cc556d.js"><link rel="prefetch" href="/assets/js/387.ee1ace1f.js"><link rel="prefetch" href="/assets/js/388.bd0a1963.js"><link rel="prefetch" href="/assets/js/389.fe03f17f.js"><link rel="prefetch" href="/assets/js/39.4c7ca432.js"><link rel="prefetch" href="/assets/js/390.73e9eba3.js"><link rel="prefetch" href="/assets/js/391.d288dac1.js"><link rel="prefetch" href="/assets/js/392.a4d0a2e5.js"><link rel="prefetch" href="/assets/js/393.db3ede6f.js"><link rel="prefetch" href="/assets/js/394.02e90324.js"><link rel="prefetch" href="/assets/js/395.6e955fee.js"><link rel="prefetch" href="/assets/js/396.1209393f.js"><link rel="prefetch" href="/assets/js/397.ed53331d.js"><link rel="prefetch" href="/assets/js/398.981568d0.js"><link rel="prefetch" href="/assets/js/399.d3cff6fc.js"><link rel="prefetch" href="/assets/js/4.99e5432f.js"><link rel="prefetch" href="/assets/js/40.d9516828.js"><link rel="prefetch" href="/assets/js/400.eb62853a.js"><link rel="prefetch" href="/assets/js/401.8e7be19d.js"><link rel="prefetch" href="/assets/js/402.1b66d463.js"><link rel="prefetch" href="/assets/js/403.13f333fb.js"><link rel="prefetch" href="/assets/js/404.57df6bb5.js"><link rel="prefetch" href="/assets/js/405.0d8fa0ca.js"><link rel="prefetch" href="/assets/js/406.b386ab43.js"><link rel="prefetch" href="/assets/js/407.090539ef.js"><link rel="prefetch" href="/assets/js/408.0b6a3785.js"><link rel="prefetch" href="/assets/js/409.a8d63c8b.js"><link rel="prefetch" href="/assets/js/41.e9874039.js"><link rel="prefetch" href="/assets/js/410.212c0170.js"><link rel="prefetch" href="/assets/js/411.10398ac5.js"><link rel="prefetch" href="/assets/js/412.9548a419.js"><link rel="prefetch" href="/assets/js/413.9e9f83cd.js"><link rel="prefetch" href="/assets/js/414.0b480df8.js"><link rel="prefetch" href="/assets/js/415.345fd8d2.js"><link rel="prefetch" href="/assets/js/416.7adc28bb.js"><link rel="prefetch" href="/assets/js/417.5bc1237c.js"><link rel="prefetch" href="/assets/js/418.decd8d51.js"><link rel="prefetch" href="/assets/js/419.a129cf6b.js"><link rel="prefetch" href="/assets/js/42.9a545fc9.js"><link rel="prefetch" href="/assets/js/420.d8a1f8b8.js"><link rel="prefetch" href="/assets/js/421.93d852bb.js"><link rel="prefetch" href="/assets/js/422.b12ea703.js"><link rel="prefetch" href="/assets/js/423.9db4679d.js"><link rel="prefetch" href="/assets/js/424.31723163.js"><link rel="prefetch" href="/assets/js/425.6738b661.js"><link rel="prefetch" href="/assets/js/426.84f5273f.js"><link rel="prefetch" href="/assets/js/427.1a2ecba4.js"><link rel="prefetch" href="/assets/js/428.0178afc3.js"><link rel="prefetch" href="/assets/js/429.92254dff.js"><link rel="prefetch" href="/assets/js/43.46ad2155.js"><link rel="prefetch" href="/assets/js/430.89f9fe63.js"><link rel="prefetch" href="/assets/js/431.72792bc1.js"><link rel="prefetch" href="/assets/js/432.9966e328.js"><link rel="prefetch" href="/assets/js/433.4265c0c8.js"><link rel="prefetch" href="/assets/js/434.9e5eb21b.js"><link rel="prefetch" href="/assets/js/435.6aa265c5.js"><link rel="prefetch" href="/assets/js/436.cab95c09.js"><link rel="prefetch" href="/assets/js/437.f2675763.js"><link rel="prefetch" href="/assets/js/438.41ae21a2.js"><link rel="prefetch" href="/assets/js/439.ee41f52f.js"><link rel="prefetch" href="/assets/js/44.42a59cfd.js"><link rel="prefetch" href="/assets/js/440.e9bbd083.js"><link rel="prefetch" href="/assets/js/441.98ac6be1.js"><link rel="prefetch" href="/assets/js/442.74d38195.js"><link rel="prefetch" href="/assets/js/443.09afe046.js"><link rel="prefetch" href="/assets/js/444.4c46cb77.js"><link rel="prefetch" href="/assets/js/445.176da1b0.js"><link rel="prefetch" href="/assets/js/446.f9bb500c.js"><link rel="prefetch" href="/assets/js/447.6a3d060d.js"><link rel="prefetch" href="/assets/js/448.aeb59378.js"><link rel="prefetch" href="/assets/js/449.1cf773be.js"><link rel="prefetch" href="/assets/js/45.d7fa5ace.js"><link rel="prefetch" href="/assets/js/450.361cf280.js"><link rel="prefetch" href="/assets/js/451.fe1519c3.js"><link rel="prefetch" href="/assets/js/452.f6bd7fc6.js"><link rel="prefetch" href="/assets/js/453.9e082df2.js"><link rel="prefetch" href="/assets/js/454.0722597b.js"><link rel="prefetch" href="/assets/js/455.b626d9d7.js"><link rel="prefetch" href="/assets/js/456.1a7a0d86.js"><link rel="prefetch" href="/assets/js/457.aa81dd07.js"><link rel="prefetch" href="/assets/js/458.061d7995.js"><link rel="prefetch" href="/assets/js/459.483e0a56.js"><link rel="prefetch" href="/assets/js/46.050eaa3a.js"><link rel="prefetch" href="/assets/js/460.53e1416a.js"><link rel="prefetch" href="/assets/js/461.a70baeaa.js"><link rel="prefetch" href="/assets/js/462.de3ff733.js"><link rel="prefetch" href="/assets/js/463.5efa8e15.js"><link rel="prefetch" href="/assets/js/464.ac02df41.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/467.5248a18b.js"><link rel="prefetch" href="/assets/js/468.8189ef87.js"><link rel="prefetch" href="/assets/js/469.dd488356.js"><link rel="prefetch" href="/assets/js/47.e3eeebae.js"><link rel="prefetch" href="/assets/js/470.2a938456.js"><link rel="prefetch" href="/assets/js/471.5331ec3d.js"><link rel="prefetch" href="/assets/js/472.be600189.js"><link rel="prefetch" href="/assets/js/473.df848339.js"><link rel="prefetch" href="/assets/js/474.0764b048.js"><link rel="prefetch" href="/assets/js/475.a64bae3a.js"><link rel="prefetch" href="/assets/js/476.58cf0222.js"><link rel="prefetch" href="/assets/js/477.c039d005.js"><link rel="prefetch" href="/assets/js/478.9ffd59ed.js"><link rel="prefetch" href="/assets/js/479.1bc0ed5c.js"><link rel="prefetch" href="/assets/js/48.bfbfacec.js"><link rel="prefetch" href="/assets/js/480.5fcca5d5.js"><link rel="prefetch" href="/assets/js/481.efcad7ff.js"><link rel="prefetch" href="/assets/js/482.65b5f5bd.js"><link rel="prefetch" href="/assets/js/483.5912789f.js"><link rel="prefetch" href="/assets/js/484.f88e59a6.js"><link rel="prefetch" href="/assets/js/485.e6e32e45.js"><link rel="prefetch" href="/assets/js/486.b790aaab.js"><link rel="prefetch" href="/assets/js/487.fb67d1f1.js"><link rel="prefetch" href="/assets/js/488.c6a8b133.js"><link rel="prefetch" href="/assets/js/489.ea60c6a2.js"><link rel="prefetch" href="/assets/js/49.619260a9.js"><link rel="prefetch" href="/assets/js/490.6e883e15.js"><link rel="prefetch" href="/assets/js/491.c61ec0cd.js"><link rel="prefetch" href="/assets/js/492.c3bfa423.js"><link rel="prefetch" href="/assets/js/493.1af17ebb.js"><link rel="prefetch" href="/assets/js/494.b0edf830.js"><link rel="prefetch" href="/assets/js/495.c94166e3.js"><link rel="prefetch" href="/assets/js/496.cc919b3c.js"><link rel="prefetch" href="/assets/js/497.84a33762.js"><link rel="prefetch" href="/assets/js/498.99f03538.js"><link rel="prefetch" href="/assets/js/499.c1cd734a.js"><link rel="prefetch" href="/assets/js/5.2c66b9cb.js"><link rel="prefetch" href="/assets/js/50.71931b96.js"><link rel="prefetch" href="/assets/js/500.fa48e85a.js"><link rel="prefetch" href="/assets/js/501.e92c2e1e.js"><link rel="prefetch" href="/assets/js/502.ccab5039.js"><link rel="prefetch" href="/assets/js/503.f5069c1f.js"><link rel="prefetch" href="/assets/js/504.31e2cf1b.js"><link rel="prefetch" href="/assets/js/505.84829db9.js"><link rel="prefetch" href="/assets/js/506.609109ab.js"><link rel="prefetch" href="/assets/js/507.5c6beca4.js"><link rel="prefetch" href="/assets/js/508.cfcce0c4.js"><link rel="prefetch" href="/assets/js/509.348fb99e.js"><link rel="prefetch" href="/assets/js/51.c8927754.js"><link rel="prefetch" href="/assets/js/510.55f9c01c.js"><link rel="prefetch" href="/assets/js/511.c904f861.js"><link rel="prefetch" href="/assets/js/512.ec1ad6da.js"><link rel="prefetch" href="/assets/js/513.024de1d4.js"><link rel="prefetch" href="/assets/js/514.2aabc985.js"><link rel="prefetch" href="/assets/js/515.6099749d.js"><link rel="prefetch" href="/assets/js/516.7f472036.js"><link rel="prefetch" href="/assets/js/517.99b51654.js"><link rel="prefetch" href="/assets/js/518.c66423f8.js"><link rel="prefetch" href="/assets/js/519.b0d28a63.js"><link rel="prefetch" href="/assets/js/52.daf7f249.js"><link rel="prefetch" href="/assets/js/520.c0c5f121.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/524.8f770bb8.js"><link rel="prefetch" href="/assets/js/525.22aa0d44.js"><link rel="prefetch" href="/assets/js/53.6d9f67be.js"><link rel="prefetch" href="/assets/js/54.5bf15548.js"><link rel="prefetch" href="/assets/js/55.ea54c735.js"><link rel="prefetch" href="/assets/js/56.b45c956c.js"><link rel="prefetch" href="/assets/js/57.541d7792.js"><link rel="prefetch" href="/assets/js/58.03e701f5.js"><link rel="prefetch" href="/assets/js/59.5065d787.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.bb695fbb.js"><link rel="prefetch" href="/assets/js/63.d096bb0b.js"><link rel="prefetch" href="/assets/js/64.cd19837f.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/67.451611ce.js"><link rel="prefetch" href="/assets/js/68.a1714cf3.js"><link rel="prefetch" href="/assets/js/69.34d0cdde.js"><link rel="prefetch" href="/assets/js/7.c4a32f95.js"><link rel="prefetch" href="/assets/js/70.8b6ec4d3.js"><link rel="prefetch" href="/assets/js/71.a113da04.js"><link rel="prefetch" href="/assets/js/72.091260fb.js"><link rel="prefetch" href="/assets/js/73.c501e2be.js"><link rel="prefetch" href="/assets/js/74.bad05dfa.js"><link rel="prefetch" href="/assets/js/75.67534bb8.js"><link rel="prefetch" href="/assets/js/76.cb3532bd.js"><link rel="prefetch" href="/assets/js/77.618b7404.js"><link rel="prefetch" href="/assets/js/78.793171cd.js"><link rel="prefetch" href="/assets/js/79.fdf77efe.js"><link rel="prefetch" href="/assets/js/8.5901c1b1.js"><link rel="prefetch" href="/assets/js/80.4c23b530.js"><link rel="prefetch" href="/assets/js/81.f344d3f5.js"><link rel="prefetch" href="/assets/js/82.a1a40237.js"><link rel="prefetch" href="/assets/js/83.254e58ba.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/87.55b4c336.js"><link rel="prefetch" href="/assets/js/88.51040255.js"><link rel="prefetch" href="/assets/js/89.9540f1f4.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.d8e05f3c.js"><link rel="prefetch" href="/assets/js/92.552b5a0d.js"><link rel="prefetch" href="/assets/js/93.d76e2b9f.js"><link rel="prefetch" href="/assets/js/94.b450d42e.js"><link rel="prefetch" href="/assets/js/95.e336cfaa.js"><link rel="prefetch" href="/assets/js/96.92052b51.js"><link rel="prefetch" href="/assets/js/97.e226f406.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/V0.10.x/Client/Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.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/V0.10.x/Client/Programming - TsFile API.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.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 (V0.10.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/V0.10.x/Client/Command Line Interface.html" class="sidebar-link">Command Line Interface</a></li><li><a href="/UserGuide/V0.10.x/Client/Programming - Native API.html" class="sidebar-link">Native API</a></li><li><a href="/UserGuide/V0.10.x/Client/Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/UserGuide/V0.10.x/Client/Programming - Other Languages.html" class="sidebar-link">Other Languages</a></li><li><a href="/UserGuide/V0.10.x/Client/Programming - TsFile API.html" class="active sidebar-link">TsFile API</a></li><li><a href="/UserGuide/V0.10.x/Client/Programming - MQTT.html" class="sidebar-link">MQTT</a></li><li><a href="/UserGuide/V0.10.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></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 we used in IoTDB. In this section, we would like to introduce 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>Using 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/incubator-iotdb.git |
| cd tsfile/ |
| mvn clean package -Dmaven.test.skip=true |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>Then, all the jars can be get in folder named <code>target/</code>. Import <code>target/tsfile-0.10.1-jar-with-dependencies.jar</code> to your project.</p></li></ul></li> <li><p>Using 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/incubator-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>0.10.1</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>0.10.1</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>A time-series 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 is taking, 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 is taking 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.</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 a 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="writing-tsfile"><a href="#writing-tsfile" class="header-anchor">#</a> Writing 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 can be generated by following three steps and the complete code will be 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 port of your HDFS by <code>config.setHdfsIp(...)</code> and <code>config.setHdfsPort(...)</code>. The default ip is <code>localhost</code> and default 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/V0.10.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/V0.10.x/Client/Programming - Other Languages.html" class="prev"> |
| Other Languages |
| </a></span> <span class="next"><a href="/UserGuide/V0.10.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.180d01d9.js" defer></script><script src="/assets/js/3.80bccc99.js" defer></script><script src="/assets/js/115.debf1614.js" defer></script> |
| </body> |
| </html> |