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class="vp-page"><!--[--><!----><!----><nav class="vp-breadcrumb disable"></nav><div class="vp-page-title"><h1><!---->JDBC</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="写作日期📅" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon" name="calendar"><path d="M716.4 110.137c0-18.753-14.72-33.473-33.472-33.473-18.753 0-33.473 14.72-33.473 33.473v33.473h66.993v-33.473zm-334.87 0c0-18.753-14.72-33.473-33.473-33.473s-33.52 14.72-33.52 33.473v33.473h66.993v-33.473zm468.81 33.52H716.4v100.465c0 18.753-14.72 33.473-33.472 33.473a33.145 33.145 0 01-33.473-33.473V143.657H381.53v100.465c0 18.753-14.72 33.473-33.473 33.473a33.145 33.145 0 01-33.473-33.473V143.657H180.6A134.314 134.314 0 0046.66 277.595v535.756A134.314 134.314 0 00180.6 947.289h669.74a134.36 134.36 0 00133.94-133.938V277.595a134.314 134.314 0 00-133.94-133.938zm33.473 267.877H147.126a33.145 33.145 0 01-33.473-33.473c0-18.752 14.72-33.473 33.473-33.473h736.687c18.752 0 33.472 14.72 33.472 33.473a33.145 33.145 0 01-33.472 33.473z"></path></svg><span data-allow-mismatch="text">2025/1/3</span><meta property="datePublished" content="2025-01-03T10:29:25.000Z"></span><!----><span class="page-reading-time-info" aria-label="阅读时间⌛" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon" name="timer"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>大约 3 分钟</span><meta property="timeRequired" content="PT3M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="jdbc" tabindex="-1"><a class="header-anchor" href="#jdbc"><span>JDBC</span></a></h1><h2 id="_1-功能介绍" tabindex="-1"><a class="header-anchor" href="#_1-功能介绍"><span>1. 功能介绍</span></a></h2><p>IoTDB JDBC接口提供了一种标准的方式来与IoTDB数据库进行交互,允许用户通过Java程序执行SQL语句来管理数据库和时间序列数据。它支持数据库的连接、创建、查询、更新和删除操作,以及时间序列数据的批量插入和查询。</p><p><strong>注意</strong>: 目前的JDBC实现仅是为与第三方工具连接使用的。使用JDBC(执行插入语句时)无法提供高性能写入。</p><p>对于Java应用,我们推荐使用Java 原生接口。</p><h2 id="_2-使用方式" tabindex="-1"><a class="header-anchor" href="#_2-使用方式"><span>2. 使用方式</span></a></h2><p><strong>环境要求:</strong></p><ul><li>JDK &gt;= 1.8</li><li>Maven &gt;= 3.6</li></ul><p><strong>在maven中添加依赖:</strong></p><div class="language-xml line-numbers-mode" data-highlighter="shiki" data-ext="xml" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-xml"><span class="line"><span style="color:#ABB2BF;">&lt;</span><span style="color:#E06C75;">dependencies</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;"> &lt;</span><span style="color:#E06C75;">dependency</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;"> &lt;</span><span style="color:#E06C75;">groupId</span><span style="color:#ABB2BF;">&gt;org.apache.iotdb&lt;/</span><span style="color:#E06C75;">groupId</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;"> &lt;</span><span style="color:#E06C75;">artifactId</span><span style="color:#ABB2BF;">&gt;iotdb-jdbc&lt;/</span><span style="color:#E06C75;">artifactId</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;"> &lt;</span><span style="color:#E06C75;">version</span><span style="color:#ABB2BF;">&gt;2.0.1-beta&lt;/</span><span style="color:#E06C75;">version</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;"> &lt;/</span><span style="color:#E06C75;">dependency</span><span style="color:#ABB2BF;">&gt;</span></span>
<span class="line"><span style="color:#ABB2BF;">&lt;/</span><span style="color:#E06C75;">dependencies</span><span style="color:#ABB2BF;">&gt;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>注意:请勿使用高版本客户端连接低版本服务。</p><h2 id="_3-读写操作" tabindex="-1"><a class="header-anchor" href="#_3-读写操作"><span>3. 读写操作</span></a></h2><h3 id="_3-1-功能说明" tabindex="-1"><a class="header-anchor" href="#_3-1-功能说明"><span>3.1 功能说明</span></a></h3><ul><li><strong>写操作</strong>:通过execute方法执行插入、创建数据库、创建时间序列等操作。</li><li><strong>读操作</strong>:通过executeQuery方法执行查询操作,并使用ResultSet对象获取查询结果。</li></ul><h3 id="_3-2-方法列表" tabindex="-1"><a class="header-anchor" href="#_3-2-方法列表"><span>3.2 <strong>方法列表</strong></span></a></h3><table><thead><tr><th><strong>方法名</strong></th><th><strong>描述</strong></th><th><strong>参数</strong></th><th><strong>返回值</strong></th></tr></thead><tbody><tr><td>Class.forName(String driver)</td><td>加载JDBC驱动类</td><td>driver: JDBC驱动类的名称</td><td>Class: 加载的类对象</td></tr><tr><td>DriverManager.getConnection(String url, String username, String password)</td><td>建立数据库连接</td><td>url: 数据库的URLusername: 数据库用户名password: 数据库密码</td><td>Connection: 数据库连接对象</td></tr><tr><td>Connection.createStatement()</td><td>创建Statement对象,用于执行SQL语句</td><td></td><td>Statement: SQL语句执行对象</td></tr><tr><td>Statement.execute(String sql)</td><td>执行SQL语句,对于非查询语句</td><td>sql: 要执行的SQL语句</td><td>boolean: 指示是否返回ResultSet对象</td></tr><tr><td>Statement.executeQuery(String sql)</td><td>执行查询SQL语句并返回结果集</td><td>sql: 要执行的查询SQL语句</td><td>ResultSet: 查询结果集</td></tr><tr><td>ResultSet.getMetaData()</td><td>获取结果集的元数据</td><td></td><td>ResultSetMetaData: 结果集元数据对象</td></tr><tr><td>ResultSet.next()</td><td>移动到结果集的下一行</td><td></td><td>boolean: 是否成功移动到下一行</td></tr><tr><td>ResultSet.getString(int columnIndex)</td><td>获取指定列的字符串值</td><td>columnIndex: 列索引(从1开始)</td><td>String: 列的字符串值</td></tr></tbody></table><h2 id="_4-示例代码" tabindex="-1"><a class="header-anchor" href="#_4-示例代码"><span>4. 示例代码</span></a></h2><p><strong>注意:使用表模型,必须在 url 中指定 sql_dialect 参数为 table。</strong></p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="color:#E5C07B;">String</span><span style="color:#E06C75;"> url </span><span style="color:#56B6C2;">=</span><span style="color:#98C379;"> &quot;jdbc:iotdb://127.0.0.1:6667?sql_dialect=table&quot;</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>JDBC接口示例代码:<a href="https://github.com/apache/iotdb/blob/rc/2.0.1/example/jdbc/src/main/java/org/apache/iotdb/TableModelJDBCExample.java" target="_blank" rel="noopener noreferrer">src/main/java/org/apache/iotdb/TableModelJDBCExample.java</a></p><div class="language-java line-numbers-mode" data-highlighter="shiki" data-ext="java" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-java"><span class="line"><span style="color:#7F848E;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * Licensed to the Apache Software Foundation (ASF) under one</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * or more contributor license agreements. See the NOTICE file</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * distributed with this work for additional information</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * regarding copyright ownership. The ASF licenses this file</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * to you under the Apache License, Version 2.0 (the</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * &quot;License&quot;); you may not use this file except in compliance</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * with the License. You may obtain a copy of the License at</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * http://www.apache.org/licenses/LICENSE-2.0</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * Unless required by applicable law or agreed to in writing,</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * software distributed under the License is distributed on an</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * KIND, either express or implied. See the License for the</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * specific language governing permissions and limitations</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * under the License.</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">package</span><span style="color:#C678DD;"> org.apache.iotdb</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> org.apache.iotdb.jdbc.IoTDBSQLException</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> org.slf4j.Logger</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> org.slf4j.LoggerFactory</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.Connection</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.DriverManager</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.ResultSet</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.ResultSetMetaData</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.SQLException</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"><span style="color:#C678DD;">import</span><span style="color:#E5C07B;"> java.sql.Statement</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">public</span><span style="color:#C678DD;"> class</span><span style="color:#E5C07B;"> TableModelJDBCExample</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;"> private</span><span style="color:#C678DD;"> static</span><span style="color:#C678DD;"> final</span><span style="color:#E5C07B;"> Logger</span><span style="color:#E06C75;"> LOGGER </span><span style="color:#56B6C2;">=</span><span style="color:#E5C07B;"> LoggerFactory</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getLogger</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">TableModelJDBCExample</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">class</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;"> public</span><span style="color:#C678DD;"> static</span><span style="color:#C678DD;"> void</span><span style="color:#61AFEF;"> main</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">String</span><span style="color:#ABB2BF;">[] </span><span style="color:#E06C75;font-style:italic;">args</span><span style="color:#ABB2BF;">)</span><span style="color:#C678DD;"> throws</span><span style="color:#E5C07B;"> ClassNotFoundException</span><span style="color:#ABB2BF;">,</span><span style="color:#E5C07B;"> SQLException</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"><span style="color:#E5C07B;"> Class</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">forName</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;org.apache.iotdb.jdbc.IoTDBDriver&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // don&#39;t specify database in url</span></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">Connection</span><span style="color:#E06C75;"> connection</span><span style="color:#56B6C2;"> =</span></span>
<span class="line"><span style="color:#E5C07B;"> DriverManager</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getConnection</span><span style="color:#ABB2BF;">(</span></span>
<span class="line"><span style="color:#98C379;"> &quot;jdbc:iotdb://127.0.0.1:6667?sql_dialect=table&quot;</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">&quot;root&quot;</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">&quot;root&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#E5C07B;"> Statement</span><span style="color:#E06C75;"> statement</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> connection</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">createStatement</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;CREATE DATABASE test1&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;CREATE DATABASE test2&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;use test2&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // or use full qualified table name</span></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span></span>
<span class="line"><span style="color:#98C379;"> &quot;create table test1.table1(region_id STRING TAG, plant_id STRING TAG, device_id STRING TAG, model STRING ATTRIBUTE, temperature FLOAT FIELD, humidity DOUBLE FIELD) with (TTL=3600000)&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span></span>
<span class="line"><span style="color:#98C379;"> &quot;create table table2(region_id STRING TAG, plant_id STRING TAG, color STRING ATTRIBUTE, temperature FLOAT FIELD, speed DOUBLE FIELD) with (TTL=6600000)&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // show tables from current database</span></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">ResultSet</span><span style="color:#E06C75;"> resultSet</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">executeQuery</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;SHOW TABLES&quot;</span><span style="color:#ABB2BF;">)) {</span></span>
<span class="line"><span style="color:#E5C07B;"> ResultSetMetaData</span><span style="color:#E06C75;"> metaData</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getMetaData</span><span style="color:#ABB2BF;">();</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">metaData</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getColumnCount</span><span style="color:#ABB2BF;">());</span></span>
<span class="line"><span style="color:#C678DD;"> while</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">next</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getString</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">) </span><span style="color:#56B6C2;">+</span><span style="color:#98C379;"> &quot;, &quot;</span><span style="color:#56B6C2;"> +</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getInt</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">));</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // show tables by specifying another database</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // using SHOW tables FROM</span></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">ResultSet</span><span style="color:#E06C75;"> resultSet</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">executeQuery</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;SHOW TABLES FROM test1&quot;</span><span style="color:#ABB2BF;">)) {</span></span>
<span class="line"><span style="color:#E5C07B;"> ResultSetMetaData</span><span style="color:#E06C75;"> metaData</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getMetaData</span><span style="color:#ABB2BF;">();</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">metaData</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getColumnCount</span><span style="color:#ABB2BF;">());</span></span>
<span class="line"><span style="color:#C678DD;"> while</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">next</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getString</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">) </span><span style="color:#56B6C2;">+</span><span style="color:#98C379;"> &quot;, &quot;</span><span style="color:#56B6C2;"> +</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getInt</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">));</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;"> } </span><span style="color:#C678DD;">catch</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">IoTDBSQLException</span><span style="color:#E06C75;font-style:italic;"> e</span><span style="color:#ABB2BF;">) {</span></span>
<span class="line"><span style="color:#E5C07B;"> LOGGER</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">error</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;IoTDB Jdbc example error&quot;</span><span style="color:#ABB2BF;">, e);</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // specify database in url</span></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">Connection</span><span style="color:#E06C75;"> connection</span><span style="color:#56B6C2;"> =</span></span>
<span class="line"><span style="color:#E5C07B;"> DriverManager</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getConnection</span><span style="color:#ABB2BF;">(</span></span>
<span class="line"><span style="color:#98C379;"> &quot;jdbc:iotdb://127.0.0.1:6667/test1?sql_dialect=table&quot;</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">&quot;root&quot;</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">&quot;root&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#E5C07B;"> Statement</span><span style="color:#E06C75;"> statement</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> connection</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">createStatement</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // show tables from current database test1</span></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">ResultSet</span><span style="color:#E06C75;"> resultSet</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">executeQuery</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;SHOW TABLES&quot;</span><span style="color:#ABB2BF;">)) {</span></span>
<span class="line"><span style="color:#E5C07B;"> ResultSetMetaData</span><span style="color:#E06C75;"> metaData</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getMetaData</span><span style="color:#ABB2BF;">();</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">metaData</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getColumnCount</span><span style="color:#ABB2BF;">());</span></span>
<span class="line"><span style="color:#C678DD;"> while</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">next</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getString</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">) </span><span style="color:#56B6C2;">+</span><span style="color:#98C379;"> &quot;, &quot;</span><span style="color:#56B6C2;"> +</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getInt</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">));</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // change database to test2</span></span>
<span class="line"><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">execute</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;use test2&quot;</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;"> try</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">ResultSet</span><span style="color:#E06C75;"> resultSet</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> statement</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">executeQuery</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">&quot;SHOW TABLES&quot;</span><span style="color:#ABB2BF;">)) {</span></span>
<span class="line"><span style="color:#E5C07B;"> ResultSetMetaData</span><span style="color:#E06C75;"> metaData</span><span style="color:#56B6C2;"> =</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getMetaData</span><span style="color:#ABB2BF;">();</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">metaData</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getColumnCount</span><span style="color:#ABB2BF;">());</span></span>
<span class="line"><span style="color:#C678DD;"> while</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">next</span><span style="color:#ABB2BF;">()) {</span></span>
<span class="line"><span style="color:#E5C07B;"> System</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">out</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">println</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getString</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">) </span><span style="color:#56B6C2;">+</span><span style="color:#98C379;"> &quot;, &quot;</span><span style="color:#56B6C2;"> +</span><span style="color:#E5C07B;"> resultSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getInt</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">));</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;"> }</span></span>
<span class="line"><span style="color:#ABB2BF;">}</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div 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