| <!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 1.5.2"> |
| <link rel="icon" href="/favicon.ico"> |
| <meta name="description" content=" "> |
| <meta name="Description" content="Apache IoTDB: Time Series Database for IoT"> |
| <meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据"> |
| <meta name="baidu-site-verification" content="wfKETzB3OT"> |
| <meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo"> |
| <link rel="preload" href="/assets/css/0.styles.47c4181e.css" as="style"><link rel="preload" href="/assets/js/app.882d9a07.js" as="script"><link rel="preload" href="/assets/js/3.1dc302ea.js" as="script"><link rel="preload" href="/assets/js/127.17ab45fd.js" as="script"><link rel="prefetch" href="/assets/js/10.df7ec35f.js"><link rel="prefetch" href="/assets/js/100.46f902a0.js"><link rel="prefetch" href="/assets/js/101.ba2c5257.js"><link rel="prefetch" href="/assets/js/102.8cfa62ff.js"><link rel="prefetch" href="/assets/js/103.ce6083bd.js"><link rel="prefetch" href="/assets/js/104.2c7e306e.js"><link rel="prefetch" href="/assets/js/105.659f7d7c.js"><link rel="prefetch" href="/assets/js/106.44f523c6.js"><link rel="prefetch" href="/assets/js/107.aabb4e24.js"><link rel="prefetch" href="/assets/js/108.0b847ccb.js"><link rel="prefetch" href="/assets/js/109.0ecdc3e8.js"><link rel="prefetch" href="/assets/js/11.a86e49df.js"><link rel="prefetch" href="/assets/js/110.5cb485d3.js"><link rel="prefetch" href="/assets/js/111.f84f011d.js"><link rel="prefetch" href="/assets/js/112.d91219bd.js"><link rel="prefetch" href="/assets/js/113.802ff697.js"><link rel="prefetch" href="/assets/js/114.4dfa6fa4.js"><link rel="prefetch" href="/assets/js/115.3b84b03c.js"><link rel="prefetch" href="/assets/js/116.95c8cffd.js"><link rel="prefetch" href="/assets/js/117.75446827.js"><link rel="prefetch" href="/assets/js/118.97f15742.js"><link rel="prefetch" href="/assets/js/119.b6069f00.js"><link rel="prefetch" href="/assets/js/12.97a469f4.js"><link rel="prefetch" href="/assets/js/120.de4776ca.js"><link rel="prefetch" href="/assets/js/121.86b44edd.js"><link rel="prefetch" href="/assets/js/122.793976e9.js"><link rel="prefetch" href="/assets/js/123.138a7ccb.js"><link rel="prefetch" href="/assets/js/124.16a35af8.js"><link rel="prefetch" href="/assets/js/125.c481e922.js"><link rel="prefetch" href="/assets/js/126.fb82ff27.js"><link rel="prefetch" href="/assets/js/128.9656b085.js"><link rel="prefetch" href="/assets/js/129.0aa7aabb.js"><link rel="prefetch" href="/assets/js/13.ca512a7d.js"><link rel="prefetch" href="/assets/js/130.7d14bd29.js"><link rel="prefetch" href="/assets/js/131.e71f08bd.js"><link rel="prefetch" href="/assets/js/132.6ea6cdf1.js"><link rel="prefetch" href="/assets/js/133.a388baa8.js"><link rel="prefetch" href="/assets/js/134.54d48b3d.js"><link rel="prefetch" href="/assets/js/135.7a128f8f.js"><link rel="prefetch" href="/assets/js/136.00a01734.js"><link rel="prefetch" href="/assets/js/137.aa593fc2.js"><link rel="prefetch" href="/assets/js/138.31960a86.js"><link rel="prefetch" href="/assets/js/139.562e6302.js"><link rel="prefetch" href="/assets/js/14.f91f7aa3.js"><link rel="prefetch" href="/assets/js/140.5f453876.js"><link rel="prefetch" href="/assets/js/141.b32d4af3.js"><link rel="prefetch" href="/assets/js/142.585e2900.js"><link rel="prefetch" href="/assets/js/143.1deb8b59.js"><link rel="prefetch" href="/assets/js/144.e98c9234.js"><link rel="prefetch" href="/assets/js/145.69e3d8ba.js"><link rel="prefetch" href="/assets/js/146.854ca873.js"><link rel="prefetch" href="/assets/js/147.ce852530.js"><link rel="prefetch" href="/assets/js/148.4df7ad54.js"><link rel="prefetch" href="/assets/js/149.5885680e.js"><link rel="prefetch" href="/assets/js/15.35ce02ea.js"><link rel="prefetch" href="/assets/js/150.e77a1752.js"><link rel="prefetch" href="/assets/js/151.e256e236.js"><link rel="prefetch" href="/assets/js/152.2269a9f4.js"><link rel="prefetch" href="/assets/js/153.67177abf.js"><link rel="prefetch" href="/assets/js/154.4b8625b0.js"><link rel="prefetch" href="/assets/js/155.84ff10ab.js"><link rel="prefetch" href="/assets/js/156.bbce15cb.js"><link rel="prefetch" href="/assets/js/157.3b84194d.js"><link rel="prefetch" href="/assets/js/158.1fc4f128.js"><link rel="prefetch" href="/assets/js/159.e74da70a.js"><link rel="prefetch" href="/assets/js/16.d053c0dc.js"><link rel="prefetch" href="/assets/js/160.5757746b.js"><link rel="prefetch" href="/assets/js/161.0956a685.js"><link rel="prefetch" href="/assets/js/162.7bdbb2e8.js"><link rel="prefetch" href="/assets/js/163.caae3dd0.js"><link rel="prefetch" href="/assets/js/164.3d527296.js"><link rel="prefetch" href="/assets/js/165.9e2592b0.js"><link rel="prefetch" href="/assets/js/166.936aefc2.js"><link rel="prefetch" href="/assets/js/167.b715a39c.js"><link rel="prefetch" href="/assets/js/168.21c20463.js"><link rel="prefetch" href="/assets/js/169.0cea4d63.js"><link rel="prefetch" href="/assets/js/17.54956aa7.js"><link rel="prefetch" href="/assets/js/170.99755400.js"><link rel="prefetch" href="/assets/js/171.a503fe92.js"><link rel="prefetch" href="/assets/js/172.b62ff159.js"><link rel="prefetch" href="/assets/js/173.ad699d64.js"><link rel="prefetch" href="/assets/js/174.12971908.js"><link rel="prefetch" href="/assets/js/175.d260a942.js"><link rel="prefetch" href="/assets/js/176.15310578.js"><link rel="prefetch" href="/assets/js/177.dca59880.js"><link rel="prefetch" href="/assets/js/178.762b5655.js"><link rel="prefetch" href="/assets/js/179.8a2150fa.js"><link rel="prefetch" href="/assets/js/18.0e32b1ca.js"><link rel="prefetch" href="/assets/js/180.812eff50.js"><link rel="prefetch" href="/assets/js/181.25741a4f.js"><link rel="prefetch" href="/assets/js/182.be1ead30.js"><link rel="prefetch" href="/assets/js/183.65da99ac.js"><link rel="prefetch" href="/assets/js/184.19aa7b39.js"><link rel="prefetch" href="/assets/js/185.3b47818d.js"><link rel="prefetch" href="/assets/js/186.f17445b2.js"><link rel="prefetch" href="/assets/js/187.5ffa8fb7.js"><link rel="prefetch" href="/assets/js/188.985b2930.js"><link rel="prefetch" href="/assets/js/189.8a086656.js"><link rel="prefetch" href="/assets/js/19.e1031edc.js"><link rel="prefetch" href="/assets/js/190.e1795abc.js"><link rel="prefetch" href="/assets/js/191.ef63b7c9.js"><link rel="prefetch" href="/assets/js/192.9b54e8a1.js"><link rel="prefetch" href="/assets/js/193.b7730945.js"><link rel="prefetch" href="/assets/js/194.bdfd3b2a.js"><link rel="prefetch" href="/assets/js/195.a49577ce.js"><link rel="prefetch" href="/assets/js/196.d7d6ea08.js"><link rel="prefetch" href="/assets/js/197.0038edae.js"><link rel="prefetch" href="/assets/js/198.2b7feb5b.js"><link rel="prefetch" href="/assets/js/199.246f826f.js"><link rel="prefetch" href="/assets/js/20.6630eb9b.js"><link rel="prefetch" href="/assets/js/200.7dd47538.js"><link rel="prefetch" href="/assets/js/201.b9f3f3ba.js"><link rel="prefetch" href="/assets/js/202.88580a02.js"><link rel="prefetch" href="/assets/js/203.dc19a146.js"><link rel="prefetch" href="/assets/js/204.3ae4039b.js"><link rel="prefetch" href="/assets/js/205.11713f93.js"><link rel="prefetch" href="/assets/js/206.5009f186.js"><link rel="prefetch" href="/assets/js/207.02d308ce.js"><link rel="prefetch" href="/assets/js/208.e0d30f83.js"><link rel="prefetch" href="/assets/js/209.a189a8f5.js"><link rel="prefetch" href="/assets/js/21.6ba053c1.js"><link rel="prefetch" href="/assets/js/210.0ab50f1b.js"><link rel="prefetch" href="/assets/js/211.ba454b99.js"><link rel="prefetch" href="/assets/js/212.5ab320e9.js"><link rel="prefetch" href="/assets/js/213.0290b30c.js"><link rel="prefetch" href="/assets/js/214.05b80625.js"><link rel="prefetch" href="/assets/js/215.69f82d6d.js"><link rel="prefetch" href="/assets/js/216.ab905448.js"><link rel="prefetch" href="/assets/js/217.bde06399.js"><link rel="prefetch" href="/assets/js/218.c3d46cb2.js"><link rel="prefetch" href="/assets/js/219.cf09aab1.js"><link rel="prefetch" href="/assets/js/22.2cc6e418.js"><link rel="prefetch" href="/assets/js/220.acfa6385.js"><link rel="prefetch" href="/assets/js/221.85cade19.js"><link rel="prefetch" href="/assets/js/222.138988e9.js"><link rel="prefetch" href="/assets/js/223.33eb46d4.js"><link rel="prefetch" href="/assets/js/224.5b505a1a.js"><link rel="prefetch" href="/assets/js/225.a00c337a.js"><link rel="prefetch" href="/assets/js/226.40b7642d.js"><link rel="prefetch" href="/assets/js/227.5855e16b.js"><link rel="prefetch" href="/assets/js/228.510e8061.js"><link rel="prefetch" href="/assets/js/229.6c905504.js"><link rel="prefetch" href="/assets/js/23.44b5e587.js"><link rel="prefetch" href="/assets/js/230.80eec0cb.js"><link rel="prefetch" href="/assets/js/231.5353f9c0.js"><link rel="prefetch" href="/assets/js/232.7caab4ae.js"><link rel="prefetch" href="/assets/js/233.429eb9ac.js"><link rel="prefetch" href="/assets/js/234.92daf6aa.js"><link rel="prefetch" href="/assets/js/235.4f96a6d2.js"><link rel="prefetch" href="/assets/js/236.f6d1fcf4.js"><link rel="prefetch" href="/assets/js/237.c81eb221.js"><link rel="prefetch" href="/assets/js/238.4d0eb5a6.js"><link rel="prefetch" href="/assets/js/239.b5fea603.js"><link rel="prefetch" href="/assets/js/24.22d894b5.js"><link rel="prefetch" href="/assets/js/240.4b907e8d.js"><link rel="prefetch" href="/assets/js/241.509179a2.js"><link rel="prefetch" href="/assets/js/242.6204b29f.js"><link rel="prefetch" href="/assets/js/243.6557eaac.js"><link rel="prefetch" href="/assets/js/244.00ba8687.js"><link rel="prefetch" href="/assets/js/245.2bccaee6.js"><link rel="prefetch" href="/assets/js/246.f450dac3.js"><link rel="prefetch" href="/assets/js/247.f8bded05.js"><link rel="prefetch" href="/assets/js/248.079a3425.js"><link rel="prefetch" href="/assets/js/249.67bc3845.js"><link rel="prefetch" href="/assets/js/25.de046fce.js"><link rel="prefetch" href="/assets/js/250.205203eb.js"><link rel="prefetch" href="/assets/js/251.c02b55cc.js"><link rel="prefetch" href="/assets/js/252.4672e689.js"><link rel="prefetch" href="/assets/js/253.eb0e0af8.js"><link rel="prefetch" href="/assets/js/254.a4560c5d.js"><link rel="prefetch" href="/assets/js/255.7da81997.js"><link rel="prefetch" href="/assets/js/256.12d8ab80.js"><link rel="prefetch" href="/assets/js/257.f75acca0.js"><link rel="prefetch" href="/assets/js/258.e5a6c8e4.js"><link rel="prefetch" href="/assets/js/259.3ffb6bec.js"><link rel="prefetch" href="/assets/js/26.22388c67.js"><link rel="prefetch" href="/assets/js/260.67eed8b3.js"><link rel="prefetch" href="/assets/js/261.6f75c141.js"><link rel="prefetch" href="/assets/js/262.2931901b.js"><link rel="prefetch" href="/assets/js/263.16ee64cc.js"><link rel="prefetch" href="/assets/js/264.cd60d20b.js"><link rel="prefetch" href="/assets/js/265.77c31e29.js"><link rel="prefetch" href="/assets/js/266.a79ab7b3.js"><link rel="prefetch" href="/assets/js/267.1c871665.js"><link rel="prefetch" href="/assets/js/268.6b7edb39.js"><link rel="prefetch" href="/assets/js/269.623f7925.js"><link rel="prefetch" href="/assets/js/27.1092da6f.js"><link rel="prefetch" href="/assets/js/270.1588dc7e.js"><link rel="prefetch" href="/assets/js/271.9d8c84d1.js"><link rel="prefetch" href="/assets/js/272.62691b38.js"><link rel="prefetch" href="/assets/js/273.9edcbfec.js"><link rel="prefetch" href="/assets/js/274.adab5090.js"><link rel="prefetch" href="/assets/js/275.5d464f4c.js"><link rel="prefetch" href="/assets/js/276.56bc4fb1.js"><link rel="prefetch" href="/assets/js/277.560abb1e.js"><link rel="prefetch" href="/assets/js/278.200f23dd.js"><link rel="prefetch" href="/assets/js/279.85bb2707.js"><link rel="prefetch" href="/assets/js/28.6ac8124e.js"><link rel="prefetch" href="/assets/js/280.78cd815f.js"><link rel="prefetch" href="/assets/js/281.301cd53d.js"><link rel="prefetch" href="/assets/js/282.0efd5adf.js"><link rel="prefetch" href="/assets/js/283.cc93d532.js"><link rel="prefetch" href="/assets/js/284.813a0148.js"><link rel="prefetch" href="/assets/js/285.64d647b3.js"><link rel="prefetch" href="/assets/js/286.f08aee76.js"><link rel="prefetch" href="/assets/js/287.7b650265.js"><link rel="prefetch" href="/assets/js/288.987b1a1a.js"><link rel="prefetch" href="/assets/js/289.0a539872.js"><link rel="prefetch" href="/assets/js/29.066202c5.js"><link rel="prefetch" href="/assets/js/290.29960eb5.js"><link rel="prefetch" href="/assets/js/291.4e4d9067.js"><link rel="prefetch" href="/assets/js/292.12a67deb.js"><link rel="prefetch" href="/assets/js/293.40828f6a.js"><link rel="prefetch" href="/assets/js/294.fdd0a014.js"><link rel="prefetch" href="/assets/js/295.f9f2d91c.js"><link rel="prefetch" href="/assets/js/296.e8663dd1.js"><link rel="prefetch" href="/assets/js/297.fb8a6d71.js"><link rel="prefetch" href="/assets/js/298.caf7b822.js"><link rel="prefetch" href="/assets/js/299.6a130c21.js"><link rel="prefetch" href="/assets/js/30.f001d2e0.js"><link rel="prefetch" href="/assets/js/300.01e0caa1.js"><link rel="prefetch" href="/assets/js/301.f32807cc.js"><link rel="prefetch" href="/assets/js/302.779651c3.js"><link rel="prefetch" href="/assets/js/303.3bdd3fe3.js"><link rel="prefetch" href="/assets/js/304.f0f81199.js"><link rel="prefetch" href="/assets/js/305.193ac400.js"><link rel="prefetch" href="/assets/js/306.bdbfc571.js"><link rel="prefetch" href="/assets/js/307.e5ac5443.js"><link rel="prefetch" href="/assets/js/308.104d4362.js"><link rel="prefetch" href="/assets/js/309.93ff7c1d.js"><link rel="prefetch" href="/assets/js/31.51ef7648.js"><link rel="prefetch" href="/assets/js/310.a6f56aee.js"><link rel="prefetch" href="/assets/js/311.5bb6779a.js"><link rel="prefetch" href="/assets/js/312.d1f1032f.js"><link rel="prefetch" href="/assets/js/313.d5d7bcf5.js"><link rel="prefetch" href="/assets/js/314.6220e3b0.js"><link rel="prefetch" href="/assets/js/315.989f9c3b.js"><link rel="prefetch" href="/assets/js/316.5c6be00c.js"><link rel="prefetch" href="/assets/js/317.5f443eed.js"><link rel="prefetch" href="/assets/js/318.bc72ddf9.js"><link rel="prefetch" href="/assets/js/319.5d9d8194.js"><link rel="prefetch" href="/assets/js/32.7dba92e8.js"><link rel="prefetch" href="/assets/js/320.aee2114d.js"><link rel="prefetch" href="/assets/js/321.de477b38.js"><link rel="prefetch" href="/assets/js/322.aa9d4016.js"><link rel="prefetch" href="/assets/js/323.178065b6.js"><link rel="prefetch" href="/assets/js/324.51fb6a96.js"><link rel="prefetch" href="/assets/js/325.1d301881.js"><link rel="prefetch" href="/assets/js/326.42161b0a.js"><link rel="prefetch" href="/assets/js/327.28ab6252.js"><link rel="prefetch" href="/assets/js/328.f7cc4627.js"><link rel="prefetch" href="/assets/js/329.b5e1d8d1.js"><link rel="prefetch" href="/assets/js/33.38edc1ca.js"><link rel="prefetch" href="/assets/js/330.110568ed.js"><link rel="prefetch" href="/assets/js/331.e357336a.js"><link rel="prefetch" href="/assets/js/332.7246ff9a.js"><link rel="prefetch" href="/assets/js/34.09d75d60.js"><link rel="prefetch" href="/assets/js/35.28f77cc1.js"><link rel="prefetch" href="/assets/js/36.170a378d.js"><link rel="prefetch" href="/assets/js/37.8a712480.js"><link rel="prefetch" href="/assets/js/38.7ed5f5d7.js"><link rel="prefetch" href="/assets/js/39.9e375df7.js"><link rel="prefetch" href="/assets/js/4.cfbdbe89.js"><link rel="prefetch" href="/assets/js/40.ca86458f.js"><link rel="prefetch" href="/assets/js/41.0a8911c5.js"><link rel="prefetch" href="/assets/js/42.1f807061.js"><link rel="prefetch" href="/assets/js/43.2ef6f503.js"><link rel="prefetch" href="/assets/js/44.5e2c4992.js"><link rel="prefetch" href="/assets/js/45.90038f5d.js"><link rel="prefetch" href="/assets/js/46.b5efd5cf.js"><link rel="prefetch" href="/assets/js/47.0aa5076d.js"><link rel="prefetch" href="/assets/js/48.b5d02afd.js"><link rel="prefetch" href="/assets/js/49.f9d012fd.js"><link rel="prefetch" href="/assets/js/5.f601e2c6.js"><link rel="prefetch" href="/assets/js/50.63eccc09.js"><link rel="prefetch" href="/assets/js/51.53cfc462.js"><link rel="prefetch" href="/assets/js/52.e9807f0e.js"><link rel="prefetch" href="/assets/js/53.cb7ce425.js"><link rel="prefetch" href="/assets/js/54.b808d48c.js"><link rel="prefetch" href="/assets/js/55.f9ab930d.js"><link rel="prefetch" href="/assets/js/56.4ef6b77e.js"><link rel="prefetch" href="/assets/js/57.ec93b220.js"><link rel="prefetch" href="/assets/js/58.8e78043b.js"><link rel="prefetch" href="/assets/js/59.33e79866.js"><link rel="prefetch" href="/assets/js/6.4e244a8f.js"><link rel="prefetch" href="/assets/js/60.416039d7.js"><link rel="prefetch" href="/assets/js/61.31256bc1.js"><link rel="prefetch" href="/assets/js/62.4dd632ab.js"><link rel="prefetch" href="/assets/js/63.d3f67d18.js"><link rel="prefetch" href="/assets/js/64.d7e3c018.js"><link rel="prefetch" href="/assets/js/65.ba0437da.js"><link rel="prefetch" href="/assets/js/66.fbe062c4.js"><link rel="prefetch" href="/assets/js/67.8b6f0f48.js"><link rel="prefetch" href="/assets/js/68.4864757c.js"><link rel="prefetch" href="/assets/js/69.0adf4b5e.js"><link rel="prefetch" href="/assets/js/7.69014dd1.js"><link rel="prefetch" href="/assets/js/70.95a01842.js"><link rel="prefetch" href="/assets/js/71.ce3fd007.js"><link rel="prefetch" href="/assets/js/72.69b7729a.js"><link rel="prefetch" href="/assets/js/73.9ae8e1ec.js"><link rel="prefetch" href="/assets/js/74.0476bee6.js"><link rel="prefetch" href="/assets/js/75.b72d48e3.js"><link rel="prefetch" href="/assets/js/76.e914a404.js"><link rel="prefetch" href="/assets/js/77.97d4a82e.js"><link rel="prefetch" href="/assets/js/78.0ccf8bcf.js"><link rel="prefetch" href="/assets/js/79.aac64bb1.js"><link rel="prefetch" href="/assets/js/8.61bc0899.js"><link rel="prefetch" href="/assets/js/80.e392086a.js"><link rel="prefetch" href="/assets/js/81.97388622.js"><link rel="prefetch" href="/assets/js/82.9366dacf.js"><link rel="prefetch" href="/assets/js/83.5ed8acc4.js"><link rel="prefetch" href="/assets/js/84.d1d33d38.js"><link rel="prefetch" href="/assets/js/85.a3ef9d25.js"><link rel="prefetch" href="/assets/js/86.31ecbe2e.js"><link rel="prefetch" href="/assets/js/87.14070733.js"><link rel="prefetch" href="/assets/js/88.1c94e8e0.js"><link rel="prefetch" href="/assets/js/89.b59e84a7.js"><link rel="prefetch" href="/assets/js/9.4c1530ec.js"><link rel="prefetch" href="/assets/js/90.4b2949f4.js"><link rel="prefetch" href="/assets/js/91.6ef1ae99.js"><link rel="prefetch" href="/assets/js/92.c13a05d5.js"><link rel="prefetch" href="/assets/js/93.4f730b35.js"><link rel="prefetch" href="/assets/js/94.2cd2abae.js"><link rel="prefetch" href="/assets/js/95.03d94edd.js"><link rel="prefetch" href="/assets/js/96.5bcbc550.js"><link rel="prefetch" href="/assets/js/97.15877723.js"><link rel="prefetch" href="/assets/js/98.beef80df.js"><link rel="prefetch" href="/assets/js/99.3c55205c.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.3b3aacb0.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.47c4181e.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/V0.9.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/V0.8.x/7-TsFile/2-Usage.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/7-TsFile/2-Usage.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/incubator-iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| gitHub |
| <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" 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></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/V0.9.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/V0.8.x/7-TsFile/2-Usage.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.8.x/7-TsFile/2-Usage.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/incubator-iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link"> |
| gitHub |
| <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" 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></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept Key Concepts and Terminology</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-Deployment and Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-IoTDB SQL Documentation</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>7-TsFile</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.8.x/7-TsFile/1-Installation.html" class="sidebar-link">Installation</a></li><li><a href="/UserGuide/V0.8.x/7-TsFile/2-Usage.html" aria-current="page" class="active sidebar-link">Usage</a></li><li><a href="/UserGuide/V0.8.x/7-TsFile/3-Hierarchy.html" class="sidebar-link">Hierarchy</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Tools</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h1> <p>Now, you are ready to start doing some awesome things with TsFile. This section demonstrates the detailed usages of TsFile.</p> <h2 id="time-series-data"><a href="#time-series-data" class="header-anchor">#</a> Time-series Data</h2> <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><h2 id="writing-tsfile"><a href="#writing-tsfile" class="header-anchor">#</a> Writing TsFile</h2> <h3 id="generate-a-tsfile-file"><a href="#generate-a-tsfile-file" class="header-anchor">#</a> Generate a TsFile File.</h3> <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, FileSchema 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, FileSchema schema) throws IOException |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><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></ul></li> <li><p>Second, add measurements</p> <p>Or you can make an instance of class <code>FileSchema</code> first and pass this to the constructor of class <code>TsFileWriter</code></p> <p>The class <code>FileSchema</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 FileSchema or from an existing map |
| public FileSchema() |
| public FileSchema(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><span class="line-number">12</span><br><span class="line-number">13</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><span class="line-number">5</span><br><span class="line-number">6</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/V0.8.x/2-Concept Key Concepts and Terminology/3-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> <h3 id="example-for-writing-a-tsfile"><a href="#example-for-writing-a-tsfile" class="header-anchor">#</a> Example for writing a TsFile</h3> <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>A more thorough example can be found at <code>/tsfile/example/src/main/java/org/apache/iotdb/tsfile/TsFileWrite.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><span class="token punctuation">.</span><span class="token class-name">File</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums</span><span class="token punctuation">.</span><span class="token class-name">TSDataType</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums</span><span class="token punctuation">.</span><span class="token class-name">TSEncoding</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write</span><span class="token punctuation">.</span><span class="token class-name">TsFileWriter</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record</span><span class="token punctuation">.</span><span class="token class-name">TSRecord</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">DataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">FloatDataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">IntDataPoint</span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>schema</span><span class="token punctuation">.</span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">;</span> |
| <span class="token comment">/** |
| * An example of writing data to TsFile |
| * It uses the interface: |
| * public void addMeasurement(MeasurementSchema MeasurementSchema) throws WriteProcessException |
| */</span> |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileWrite</span> <span class="token punctuation">{</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span> args<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">"test.tsfile"</span><span class="token punctuation">;</span> |
| <span class="token class-name">File</span> f <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>f<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| f<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token class-name">TsFileWriter</span> tsFileWriter <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileWriter</span><span class="token punctuation">(</span>f<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// add measurements into file schema</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_1"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_2"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsFileWriter |
| <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">"sensor_3"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// construct TSRecord</span> |
| <span class="token class-name">TSRecord</span> tsRecord <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TSRecord</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">"device_1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_1"</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_2"</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">DataPoint</span> dPoint3 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">"sensor_3"</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint1<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint2<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint3<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// write TSRecord</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>tsRecord<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// close TsFile</span> |
| tsFileWriter<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br></div></div><h2 id="interface-for-reading-tsfile"><a href="#interface-for-reading-tsfile" class="header-anchor">#</a> Interface for Reading TsFile</h2> <h3 id="before-the-start"><a href="#before-the-start" class="header-anchor">#</a> Before the Start</h3> <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> <table><thead><tr><th style="text-align:center;">Relationship</th> <th style="text-align:center;">Description</th></tr></thead> <tbody><tr><td style="text-align:center;">TimeFilter.eq(value)</td> <td style="text-align:center;">Choose the time equal to the value</td></tr> <tr><td style="text-align:center;">TimeFilter.lt(value)</td> <td style="text-align:center;">Choose the time less than the value</td></tr> <tr><td style="text-align:center;">TimeFilter.gt(value)</td> <td style="text-align:center;">Choose the time greater than the value</td></tr> <tr><td style="text-align:center;">TimeFilter.ltEq(value)</td> <td style="text-align:center;">Choose the time less than or equal to the value</td></tr> <tr><td style="text-align:center;">TimeFilter.gtEq(value)</td> <td style="text-align:center;">Choose the time greater than or equal to the value</td></tr> <tr><td style="text-align:center;">TimeFilter.notEq(value)</td> <td style="text-align:center;">Choose the time not equal to the value</td></tr> <tr><td style="text-align:center;">TimeFilter.not(TimeFilter)</td> <td style="text-align:center;">Choose the time not satisfy another TimeFilter</td></tr></tbody></table> <h3 id="definition-of-path"><a href="#definition-of-path" class="header-anchor">#</a> Definition of Path</h3> <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> <h3 id="definition-of-filter"><a href="#definition-of-filter" class="header-anchor">#</a> Definition of Filter</h3> <h4 id="usage-scenario"><a href="#usage-scenario" class="header-anchor">#</a> Usage Scenario</h4> <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>TimeFilter: A filter for <code>time</code> in time-series data.<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></li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code> Use the following relationships to get a `TimeFilter` object (value is a long int variable). |
| |
| | Relationship | Description | |
| | :------------------------: | :------------------------------------------------: | |
| | TimeFilter.eq(value) | Choose the time equal to the value | |
| | TimeFilter.lt(value) | Choose the time less than the value | |
| | TimeFilter.gt(value) | Choose the time greater than the value | |
| | TimeFilter.ltEq(value) | Choose the time less than or equal to the value | |
| | TimeFilter.gtEq(value) | Choose the time greater than or equal to the value | |
| | TimeFilter.notEq(value) | Choose the time not equal to the value | |
| | TimeFilter.not(TimeFilter) | Choose the time not satisfy another TimeFilter | |
| |
| * ValueFilter: A filter for `value` in time-series data. |
| |
| </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></div></div><p>IExpression valueFilterExpr = new SingleSeriesExpression(Path, ValueFilter);</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> The usage of `ValueFilter` is the same as using `TimeFilter`, just to make sure that the type of the value |
| equal to the measurement's(defined in the path). |
| |
| </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></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> <h4 id="filter-expression-examples"><a href="#filter-expression-examples" class="header-anchor">#</a> Filter Expression Examples</h4> <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> <h3 id="read-interface"><a href="#read-interface" class="header-anchor">#</a> Read Interface</h3> <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> <h3 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</h3> <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>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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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><span class="token punctuation">.</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="user-specified-config-file-path"><a href="#user-specified-config-file-path" class="header-anchor">#</a> User-specified config file path</h2> <p>Default config file <code>tsfile-format.properties.template</code> is located at <code>/tsfile/src/main/resources</code> directory. If you want to use your own path, you can:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>System.setProperty(TsFileConstant.TSFILE_CONF, "your config file path"); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>and then call:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig config = TSFileDescriptor.getInstance().getConfig(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/UserGuide/V0.8.x/7-TsFile/1-Installation.html" class="prev"> |
| Installation |
| </a></span> <span class="next"><a href="/UserGuide/V0.8.x/7-TsFile/3-Hierarchy.html"> |
| Hierarchy |
| </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:justify!important;paddingLeft:10px;paddingRight:10px;"> |
| Disclaimer: Apache IoTDB (incubating) is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF. |
| </p></main></div><div class="global-ui"></div></div> |
| <script src="/assets/js/app.882d9a07.js" defer></script><script src="/assets/js/3.1dc302ea.js" defer></script><script src="/assets/js/127.17ab45fd.js" defer></script> |
| </body> |
| </html> |