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| <svg xmlns="http://www.w3.org/2000/svg" aria-labelledby="outbound-link-title" role="img" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><title id="outbound-link-title">(opens new window)</title> <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用户手册 (V0.9.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-概览</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>4-客户端</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.9.x/4-Client/1-Command Line Interface.html" class="sidebar-link">命令行接口 (CLI)</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/2-Programming - JDBC.html" class="active sidebar-link">JDBC</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/3-Programming - Session.html" class="sidebar-link">Session</a></li><li><a href="/zh/UserGuide/V0.9.x/4-Client/4-Programming - Other Languages.html" class="sidebar-link">其他语言</a></li><li><a href="/zh/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-操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="编程-jdbc"><a href="#编程-jdbc" class="header-anchor">#</a> 编程 - JDBC</h1> <h2 id="使用"><a href="#使用" class="header-anchor">#</a> 使用</h2> <h2 id="依赖项"><a href="#依赖项" class="header-anchor">#</a> 依赖项</h2> <ul><li>JDK >= 1.8</li> <li>Maven >= 3.1</li></ul> <h3 id="只打包-jdbc-工程"><a href="#只打包-jdbc-工程" class="header-anchor">#</a> 只打包 JDBC 工程</h3> <p>在根目录下执行下面的命令:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean package -pl jdbc -am -Dmaven.test.skip=true |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="如何到本地-maven-仓库"><a href="#如何到本地-maven-仓库" class="header-anchor">#</a> 如何到本地 MAVEN 仓库</h3> <p>在根目录下执行下面的命令:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean install -pl jdbc -am -Dmaven.test.skip=true |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="如何在-maven-中使用-iotdb-jdbc"><a href="#如何在-maven-中使用-iotdb-jdbc" class="header-anchor">#</a> 如何在 MAVEN 中使用 IoTDB JDBC</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code><dependencies> |
| <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>iotdb-jdbc</artifactId> |
| <version>0.8.0</version> |
| </dependency> |
| </dependencies> |
| </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="示例"><a href="#示例" class="header-anchor">#</a> 示例</h3> <p>本章提供了如何建立数据库连接、执行 SQL 和显示查询结果的示例。</p> <p>要求您已经在工程中包含了数据库编程所需引入的包和 JDBC class.</p> <p><strong>注意:为了更快地插入，建议使用 insertBatch()</strong></p> <div class="language-Java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>sql<span class="token punctuation">.</span></span><span class="token operator">*</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>jdbc<span class="token punctuation">.</span></span><span class="token class-name">IoTDBSQLException</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">JDBCExample</span> <span class="token punctuation">{</span> |
| <span class="token comment">/** |
| * Before executing a SQL statement with a Statement object, you need to create a Statement object using the createStatement() method of the Connection object. |
| * After creating a Statement object, you can use its execute() method to execute a SQL statement |
| * Finally, remember to close the 'statement' and 'connection' objects by using their close() method |
| * For statements with query results, we can use the getResultSet() method of the Statement object to get the result set. |
| */</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">SQLException</span> <span class="token punctuation">{</span> |
| <span class="token class-name">Connection</span> connection <span class="token operator">=</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>connection <span class="token operator">==</span> <span class="token keyword">null</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">"get connection defeat"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">return</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token class-name">Statement</span> statement <span class="token operator">=</span> connection<span class="token punctuation">.</span><span class="token function">createStatement</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//Create storage group</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"SET STORAGE GROUP TO root.demo"</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">IoTDBSQLException</span> e<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 comment">//Show storage group</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"SHOW STORAGE GROUP"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Create time series</span> |
| <span class="token comment">//Different data type has different encoding methods. Here use INT32 as an example</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"CREATE TIMESERIES root.demo.s0 WITH DATATYPE=INT32,ENCODING=RLE;"</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">IoTDBSQLException</span> e<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 comment">//Show time series</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"SHOW TIMESERIES root.demo"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//Show devices</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"SHOW DEVICES"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//Count time series</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"COUNT TIMESERIES root"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//Count nodes at the given level</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"COUNT NODES root LEVEL=3"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//Count timeseries group by each node at the given level</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"COUNT TIMESERIES root GROUP BY LEVEL=3"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>statement<span class="token punctuation">.</span><span class="token function">getResultSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| |
| <span class="token comment">//Execute insert statements in batch</span> |
| statement<span class="token punctuation">.</span><span class="token function">addBatch</span><span class="token punctuation">(</span><span class="token string">"insert into root.demo(timestamp,s0) values(1,1);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">addBatch</span><span class="token punctuation">(</span><span class="token string">"insert into root.demo(timestamp,s0) values(1,1);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">addBatch</span><span class="token punctuation">(</span><span class="token string">"insert into root.demo(timestamp,s0) values(2,15);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">addBatch</span><span class="token punctuation">(</span><span class="token string">"insert into root.demo(timestamp,s0) values(2,17);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">addBatch</span><span class="token punctuation">(</span><span class="token string">"insert into root.demo(timestamp,s0) values(4,12);"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">executeBatch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| statement<span class="token punctuation">.</span><span class="token function">clearBatch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Full query statement</span> |
| <span class="token class-name">String</span> sql <span class="token operator">=</span> <span class="token string">"select * from root.demo"</span><span class="token punctuation">;</span> |
| <span class="token class-name">ResultSet</span> resultSet <span class="token operator">=</span> statement<span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span>sql<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">"sql: "</span> <span class="token operator">+</span> sql<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>resultSet<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Exact query statement</span> |
| sql <span class="token operator">=</span> <span class="token string">"select s0 from root.demo where time = 4;"</span><span class="token punctuation">;</span> |
| resultSet<span class="token operator">=</span> statement<span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span>sql<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">"sql: "</span> <span class="token operator">+</span> sql<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>resultSet<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Time range query</span> |
| sql <span class="token operator">=</span> <span class="token string">"select s0 from root.demo where time >= 2 and time < 5;"</span><span class="token punctuation">;</span> |
| resultSet <span class="token operator">=</span> statement<span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span>sql<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">"sql: "</span> <span class="token operator">+</span> sql<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>resultSet<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Aggregate query</span> |
| sql <span class="token operator">=</span> <span class="token string">"select count(s0) from root.demo;"</span><span class="token punctuation">;</span> |
| resultSet <span class="token operator">=</span> statement<span class="token punctuation">.</span><span class="token function">executeQuery</span><span class="token punctuation">(</span>sql<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">"sql: "</span> <span class="token operator">+</span> sql<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token function">outputResult</span><span class="token punctuation">(</span>resultSet<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//Delete time series</span> |
| statement<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token string">"delete timeseries root.demo.s0"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//close connection</span> |
| statement<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> |
| connection<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">public</span> <span class="token keyword">static</span> <span class="token class-name">Connection</span> <span class="token function">getConnection</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token comment">// JDBC driver name and database URL</span> |
| <span class="token class-name">String</span> driver <span class="token operator">=</span> <span class="token string">"org.apache.iotdb.jdbc.IoTDBDriver"</span><span class="token punctuation">;</span> |
| <span class="token class-name">String</span> url <span class="token operator">=</span> <span class="token string">"jdbc:iotdb://127.0.0.1:6667/"</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Database credentials</span> |
| <span class="token class-name">String</span> username <span class="token operator">=</span> <span class="token string">"root"</span><span class="token punctuation">;</span> |
| <span class="token class-name">String</span> password <span class="token operator">=</span> <span class="token string">"root"</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">Connection</span> connection <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| <span class="token class-name">Class</span><span class="token punctuation">.</span><span class="token function">forName</span><span class="token punctuation">(</span>driver<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| connection <span class="token operator">=</span> <span class="token class-name">DriverManager</span><span class="token punctuation">.</span><span class="token function">getConnection</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> username<span class="token punctuation">,</span> password<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">ClassNotFoundException</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 punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">SQLException</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 punctuation">}</span> |
| <span class="token keyword">return</span> connection<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token comment">/** |
| * This is an example of outputting the results in the ResultSet |
| */</span> |
| <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">outputResult</span><span class="token punctuation">(</span><span class="token class-name">ResultSet</span> resultSet<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SQLException</span> <span class="token punctuation">{</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>resultSet <span class="token operator">!=</span> <span class="token keyword">null</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 keyword">final</span> <span class="token class-name">ResultSetMetaData</span> metaData <span class="token operator">=</span> resultSet<span class="token punctuation">.</span><span class="token function">getMetaData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">final</span> <span class="token keyword">int</span> columnCount <span class="token operator">=</span> metaData<span class="token punctuation">.</span><span class="token function">getColumnCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> columnCount<span class="token punctuation">;</span> i<span class="token operator">++</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">print</span><span class="token punctuation">(</span>metaData<span class="token punctuation">.</span><span class="token function">getColumnLabel</span><span class="token punctuation">(</span>i <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" "</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 punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">while</span> <span class="token punctuation">(</span>resultSet<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 keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> <span class="token punctuation">;</span> i<span class="token operator">++</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">print</span><span class="token punctuation">(</span>resultSet<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator"><</span> columnCount<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">print</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">else</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 punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">break</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">"--------------------------\n"</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 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class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br><span class="line-number">136</span><br><span class="line-number">137</span><br><span class="line-number">138</span><br><span class="line-number">139</span><br><span class="line-number">140</span><br><span class="line-number">141</span><br><span class="line-number">142</span><br></div></div><h2 id="状态码"><a href="#状态码" class="header-anchor">#</a> 状态码</h2> <p>在最新版本中引入了<strong>状态码</strong>这一概念。例如，因为IoTDB需要在写入数据之前首先注册时间序列，一种可能的解决方案是：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>try { |
| writeData(); |
| } catch (SQLException e) { |
| // the most case is that the time series does not exist |
| if (e.getMessage().contains("exist")) { |
| //However, using the content of the error message is not so efficient |
| registerTimeSeries(); |
| //write data once again |
| writeData(); |
| } |
| } |
| |
| </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></div></div><p>利用状态码，我们就可以不必写诸如<code>if (e.getErrorMessage().contains("exist"))</code>的代码，只需要使用<code>e.getStatusType().getCode() == TSStatusCode.TIME_SERIES_NOT_EXIST_ERROR.getStatusCode()</code>。</p> <p>这里是状态码和相对应信息的列表：</p> <table><thead><tr><th style="text-align:left;">状态码</th> <th style="text-align:left;">状态类型</th> <th style="text-align:left;">状态信息</th></tr></thead> <tbody><tr><td style="text-align:left;">200</td> <td style="text-align:left;">SUCCESS_STATUS</td> <td style="text-align:left;"></td></tr> <tr><td style="text-align:left;">201</td> <td style="text-align:left;">STILL_EXECUTING_STATUS</td> <td style="text-align:left;"></td></tr> <tr><td style="text-align:left;">202</td> <td style="text-align:left;">INVALID_HANDLE_STATUS</td> <td style="text-align:left;"></td></tr> <tr><td style="text-align:left;">300</td> <td style="text-align:left;">TIMESERIES_ALREADY_EXIST_ERROR</td> <td style="text-align:left;">时间序列已经存在</td></tr> <tr><td style="text-align:left;">301</td> <td style="text-align:left;">TIMESERIES_NOT_EXIST_ERROR</td> <td style="text-align:left;">时间序列不存在</td></tr> <tr><td style="text-align:left;">302</td> <td style="text-align:left;">UNSUPPORTED_FETCH_METADATA_OPERATION_ERROR</td> <td style="text-align:left;">不支持的获取元数据操作</td></tr> <tr><td style="text-align:left;">303</td> <td style="text-align:left;">METADATA_ERROR</td> <td style="text-align:left;">处理元数据错误</td></tr> <tr><td style="text-align:left;">304</td> <td style="text-align:left;">CHECK_FILE_LEVEL_ERROR</td> <td style="text-align:left;">检查文件层级错误</td></tr> <tr><td style="text-align:left;">305</td> <td style="text-align:left;">OUT_OF_TTL_ERROR</td> <td style="text-align:left;">插入时间少于TTL时间边界</td></tr> <tr><td style="text-align:left;">306</td> <td style="text-align:left;">CONFIG_ADJUSTER</td> <td style="text-align:left;">IoTDB系统负载过大</td></tr> <tr><td style="text-align:left;">307</td> <td style="text-align:left;">MERGE_ERROR</td> <td style="text-align:left;">合并错误</td></tr> <tr><td style="text-align:left;">308</td> <td style="text-align:left;">SYSTEM_CHECK_ERROR</td> <td style="text-align:left;">系统检查错误</td></tr> <tr><td style="text-align:left;">309</td> <td style="text-align:left;">SYNC_DEVICE_OWNER_CONFLICT_ERROR</td> <td style="text-align:left;">回传设备冲突错误</td></tr> <tr><td style="text-align:left;">310</td> <td style="text-align:left;">SYNC_CONNECTION_EXCEPTION</td> <td style="text-align:left;">回传连接错误</td></tr> <tr><td style="text-align:left;">311</td> <td style="text-align:left;">STORAGE_GROUP_PROCESSOR_ERROR</td> <td style="text-align:left;">存储组处理器相关错误</td></tr> <tr><td style="text-align:left;">312</td> <td style="text-align:left;">STORAGE_GROUP_ERROR</td> <td style="text-align:left;">存储组相关错误</td></tr> <tr><td style="text-align:left;">313</td> <td style="text-align:left;">STORAGE_ENGINE_ERROR</td> <td style="text-align:left;">存储引擎相关错误</td></tr> <tr><td style="text-align:left;">400</td> <td style="text-align:left;">EXECUTE_STATEMENT_ERROR</td> <td style="text-align:left;">执行语句错误</td></tr> <tr><td style="text-align:left;">401</td> <td style="text-align:left;">SQL_PARSE_ERROR</td> <td style="text-align:left;">SQL语句分析错误</td></tr> <tr><td style="text-align:left;">402</td> <td style="text-align:left;">GENERATE_TIME_ZONE_ERROR</td> <td style="text-align:left;">生成时区错误</td></tr> <tr><td style="text-align:left;">403</td> <td style="text-align:left;">SET_TIME_ZONE_ERROR</td> <td style="text-align:left;">设置时区错误</td></tr> <tr><td style="text-align:left;">404</td> <td style="text-align:left;">NOT_STORAGE_GROUP_ERROR</td> <td style="text-align:left;">操作对象不是存储组</td></tr> <tr><td style="text-align:left;">405</td> <td style="text-align:left;">QUERY_NOT_ALLOWED</td> <td style="text-align:left;">查询语句不允许</td></tr> <tr><td style="text-align:left;">406</td> <td style="text-align:left;">AST_FORMAT_ERROR</td> <td style="text-align:left;">AST格式相关错误</td></tr> <tr><td style="text-align:left;">407</td> <td style="text-align:left;">LOGICAL_OPERATOR_ERROR</td> <td style="text-align:left;">逻辑符相关错误</td></tr> <tr><td style="text-align:left;">408</td> <td style="text-align:left;">LOGICAL_OPTIMIZE_ERROR</td> <td style="text-align:left;">逻辑优化相关错误</td></tr> <tr><td style="text-align:left;">409</td> <td style="text-align:left;">UNSUPPORTED_FILL_TYPE_ERROR</td> <td style="text-align:left;">不支持的填充类型</td></tr> <tr><td style="text-align:left;">410</td> <td style="text-align:left;">PATH_ERROR</td> <td style="text-align:left;">路径相关错误</td></tr> <tr><td style="text-align:left;">405</td> <td style="text-align:left;">READ_ONLY_SYSTEM_ERROR</td> <td style="text-align:left;">操作系统只读</td></tr> <tr><td style="text-align:left;">500</td> <td style="text-align:left;">INTERNAL_SERVER_ERROR</td> <td style="text-align:left;">服务器内部错误</td></tr> <tr><td style="text-align:left;">501</td> <td style="text-align:left;">CLOSE_OPERATION_ERROR</td> <td style="text-align:left;">关闭操作错误</td></tr> <tr><td style="text-align:left;">502</td> <td style="text-align:left;">READ_ONLY_SYSTEM_ERROR</td> <td style="text-align:left;">系统只读</td></tr> <tr><td style="text-align:left;">503</td> <td style="text-align:left;">DISK_SPACE_INSUFFICIENT_ERROR</td> <td style="text-align:left;">磁盘空间不足</td></tr> <tr><td style="text-align:left;">504</td> <td style="text-align:left;">START_UP_ERROR</td> <td style="text-align:left;">启动错误</td></tr> <tr><td style="text-align:left;">600</td> <td style="text-align:left;">WRONG_LOGIN_PASSWORD_ERROR</td> <td style="text-align:left;">用户名或密码错误</td></tr> <tr><td style="text-align:left;">601</td> <td style="text-align:left;">NOT_LOGIN_ERROR</td> <td style="text-align:left;">没有登录</td></tr> <tr><td style="text-align:left;">602</td> <td style="text-align:left;">NO_PERMISSION_ERROR</td> <td style="text-align:left;">没有操作权限</td></tr> <tr><td style="text-align:left;">603</td> <td style="text-align:left;">UNINITIALIZED_AUTH_ERROR</td> <td style="text-align:left;">授权人未初始化</td></tr></tbody></table> <blockquote><p>在最新版本中，我们重构了IoTDB的异常类。通过将错误信息统一提取到异常类中，并为所有异常添加不同的错误代码，从而当捕获到异常并引发更高级别的异常时，错误代码将保留并传递，以便用户了解详细的错误原因。 |
| 除此之外，我们添加了一个基础异常类“ProcessException”，由所有异常扩展。</p></blockquote></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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