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| <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 (V0.9.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</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>4-Client</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.9.x/4-Client/1-Command Line Interface.html" class="sidebar-link">Command Line Interface</a></li><li><a href="/UserGuide/V0.9.x/4-Client/2-Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/UserGuide/V0.9.x/4-Client/3-Programming - Session.html" class="active sidebar-link">Session</a></li><li><a href="/UserGuide/V0.9.x/4-Client/4-Programming - Other Languages.html" class="sidebar-link">Other Languages</a></li><li><a href="/UserGuide/V0.9.x/4-Client/5-Programming - TsFile API.html" class="sidebar-link">TsFile API</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Design</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="programming-session"><a href="#programming-session" class="header-anchor">#</a> Programming - Session</h1> <h2 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h2> <h3 id="dependencies"><a href="#dependencies" class="header-anchor">#</a> Dependencies</h3> <ul><li>JDK >= 1.8</li> <li>Maven >= 3.1</li></ul> <h3 id="how-to-package-only-client-module"><a href="#how-to-package-only-client-module" class="header-anchor">#</a> How to package only client module</h3> <p>In root directory:</p> <blockquote><p>mvn clean package -pl client -am -Dmaven.test.skip=true</p></blockquote> <h3 id="how-to-install-in-local-maven-repository"><a href="#how-to-install-in-local-maven-repository" class="header-anchor">#</a> How to install in local maven repository</h3> <p>In root directory:</p> <blockquote><p>mvn clean install -pl client -am -Dmaven.test.skip=true</p></blockquote> <h3 id="using-iotdb-session-with-maven"><a href="#using-iotdb-session-with-maven" class="header-anchor">#</a> Using IoTDB Session with Maven</h3> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token generics"><span class="token punctuation"><</span>dependencies<span class="token punctuation">></span></span> |
| <span class="token generics"><span class="token punctuation"><</span>dependency<span class="token punctuation">></span></span> |
| <span class="token generics"><span class="token punctuation"><</span>groupId<span class="token punctuation">></span></span>org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token operator"><</span><span class="token operator">/</span>groupId<span class="token operator">></span> |
| <span class="token generics"><span class="token punctuation"><</span>artifactId<span class="token punctuation">></span></span>iotdb<span class="token operator">-</span>session<span class="token operator"><</span><span class="token operator">/</span>artifactId<span class="token operator">></span> |
| <span class="token generics"><span class="token punctuation"><</span>version<span class="token punctuation">></span></span><span class="token number">0.9</span><span class="token number">.3</span><span class="token operator"><</span><span class="token operator">/</span>version<span class="token operator">></span> |
| <span class="token operator"><</span><span class="token operator">/</span>dependency<span class="token operator">></span> |
| <span class="token operator"><</span><span class="token operator">/</span>dependencies<span class="token operator">></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></div></div><h3 id="examples-with-session-interfaces"><a href="#examples-with-session-interfaces" class="header-anchor">#</a> Examples with Session interfaces</h3> <p>Here we show the commonly used interfaces and their parameters in the Session:</p> <h4 id="run-the-session"><a href="#run-the-session" class="header-anchor">#</a> Run the Session</h4> <ul><li><p>Initialize a Session</p> <p>Session(String host, int port)</p> <p>Session(String host, String port, String username, String password)</p> <p>Session(String host, int port, String username, String password)</p></li> <li><p>Open a Session</p> <p> Session.open()</p></li> <li><p>Close a Session</p> <p> Session.close()</p></li></ul> <h4 id="operate-the-session"><a href="#operate-the-session" class="header-anchor">#</a> Operate the Session</h4> <ul><li><p>Set storage group</p> <p> TSStatus setStorageGroup(String storageGroupId)</p></li> <li><p>Delete one or several storage groups</p> <p> TSStatus deleteStorageGroup(String storageGroup)</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSStatus deleteStorageGroups(List<String> storageGroups) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Create one timeseries under a existing storage group</p> <p> TSStatus createTimeseries(String path, TSDataType dataType, TSEncoding encoding, CompressionType compressor)</p></li> <li><p>Delete one or several timeseries</p> <p> TSStatus deleteTimeseries(String path)</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSStatus deleteTimeseries(List<String> paths) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Delete one or several timeseries before a certain timestamp</p> <p> TSStatus deleteData(String path, long time)</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSStatus deleteData(List<String> paths, long time) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Insert data into existing timeseries</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSStatus insert(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Batch insertion into timeseries</p> <p> TSExecuteBatchStatementResp insertBatch(RowBatch rowBatch)</p></li></ul> <h4 id="sample-code"><a href="#sample-code" class="header-anchor">#</a> Sample code</h4> <p>To get more information of the following interfaces, please view session/src/main/java/org/apache/iotdb/session/Session.java</p> <p>The sample code of using these interfaces is in example/session/src/main/java/org/apache/iotdb/SessionExample.java，which provides an example of how to open an IoTDB session, execute a batch insertion.</p> <h1 id="session-pool-for-native-api"><a href="#session-pool-for-native-api" class="header-anchor">#</a> Session Pool for Native API</h1> <p>We provided a connection pool (`SessionPool) for Native API. |
| Using the interface, you need to define the pool size.</p> <p>If you can not get a session connection in 60 secondes, there is a warning log but the program will hang.</p> <p>If a session has finished an operation, it will be put back to the pool automatically. |
| If a session connection is broken, the session will be removed automatically and the pool will try |
| to create a new session and redo the operation.</p> <p>For query operations:</p> <ol><li>When using SessionPool to query data, the result set is <code>SessionDataSetWrapper</code>;</li> <li>Given a <code>SessionDataSetWrapper</code>, if you have not scanned all the data in it and stop to use it, |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li> <li>When you call <code>hasNext()</code> and <code>next()</code> of a <code>SessionDataSetWrapper</code> and there is an exception, then |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li></ol> <p>Examples: <code>session/src/test/java/org/apache/iotdb/session/pool/SessionPoolTest.java</code></p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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