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| gitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Client</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.11.x/Client/Command Line Interface.html" class="sidebar-link">Command Line Interface</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Native API.html" class="sidebar-link">Native API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - JDBC.html" class="active sidebar-link">JDBC</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Other Languages.html" class="sidebar-link">Other Languages</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - TsFile API.html" class="sidebar-link">TsFile API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - MQTT.html" class="sidebar-link">MQTT</a></li><li><a href="/UserGuide/V0.11.x/Client/Status Codes.html" class="sidebar-link">Status Codes</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="programming-jdbc"><a href="#programming-jdbc" class="header-anchor">#</a> Programming - JDBC</h1> <h2 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h2> <h2 id="dependencies"><a href="#dependencies" class="header-anchor">#</a> Dependencies</h2> <ul><li>JDK >= 1.8</li> <li>Maven >= 3.1</li></ul> <h2 id="package-only-jdbc-projects"><a href="#package-only-jdbc-projects" class="header-anchor">#</a> Package only JDBC projects</h2> <p>Execute the following command in the root directory:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean package -pl jdbc -am -DskipTests |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="install-in-local-maven-repository"><a href="#install-in-local-maven-repository" class="header-anchor">#</a> Install in local maven repository</h2> <p>In root directory:</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><h2 id="use-iotdb-jdbc-with-maven"><a href="#use-iotdb-jdbc-with-maven" class="header-anchor">#</a> Use IoTDB JDBC with Maven</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code><dependencies> |
| <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>iotdb-jdbc</artifactId> |
| <version>0.11.1</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><h2 id="examples"><a href="#examples" class="header-anchor">#</a> Examples</h2> <p>This chapter provides an example of how to open a database connection, execute a SQL query, and display the results.</p> <p>It requires including the packages containing the JDBC classes needed for database programming.</p> <p><strong>NOTE: For faster insertion, the insertTablet() in Session is recommended.</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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