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disable"></nav><div class="vp-page-title"><h1><!---->Go 原生接口</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">2025/4/22</span><meta property="datePublished" content="2025-04-22T04:17:55.000Z"></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 8 分钟</span><meta property="timeRequired" content="PT8M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="go-原生接口" tabindex="-1"><a class="header-anchor" href="#go-原生接口"><span>Go 原生接口</span></a></h1><h2 id="_1-使用方法" tabindex="-1"><a class="header-anchor" href="#_1-使用方法"><span>1. 使用方法</span></a></h2><h3 id="_1-1-依赖" tabindex="-1"><a class="header-anchor" href="#_1-1-依赖"><span>1.1 依赖</span></a></h3><ul><li>golang >= 1.13</li><li>make >= 3.0</li><li>curl >= 7.1.1</li><li>thrift 0.15.0</li><li>Linux、Macos 或其他类 unix 系统</li><li>Windows+bash (下载 IoTDB Go client 需要 git ，通过 WSL、cygwin、Git Bash 任意一种方式均可)</li></ul><h3 id="_1-2-安装方法" tabindex="-1"><a class="header-anchor" href="#_1-2-安装方法"><span>1.2 安装方法</span></a></h3><ul><li>通过 go mod</li></ul><div class="language-sh line-numbers-mode" data-highlighter="shiki" data-ext="sh" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sh"><span class="line"><span style="color:#7F848E;font-style:italic;"># 切换到 GOPATH 的 HOME 路径，启用 Go Modules 功能</span></span> |
| <span class="line"><span style="color:#C678DD;">export</span><span style="color:#E06C75;"> GO111MODULE</span><span style="color:#56B6C2;">=</span><span style="color:#E06C75;">on</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 配置 GOPROXY 环境变量</span></span> |
| <span class="line"><span style="color:#C678DD;">export</span><span style="color:#E06C75;"> GOPROXY</span><span style="color:#56B6C2;">=</span><span style="color:#E06C75;">https</span><span style="color:#ABB2BF;">://</span><span style="color:#E06C75;">goproxy</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">io</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 创建命名的文件夹或目录，并切换当前目录</span></span> |
| <span class="line"><span style="color:#61AFEF;">mkdir</span><span style="color:#98C379;"> session_example</span><span style="color:#ABB2BF;"> && </span><span style="color:#56B6C2;">cd</span><span style="color:#98C379;"> session_example</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 保存文件，自动跳转到新的地址</span></span> |
| <span class="line"><span style="color:#61AFEF;">curl</span><span style="color:#D19A66;"> -o</span><span style="color:#98C379;"> session_example.go</span><span style="color:#D19A66;"> -L</span><span style="color:#98C379;"> https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 初始化 go module 环境</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> mod</span><span style="color:#98C379;"> init</span><span style="color:#98C379;"> session_example</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 下载依赖包</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> mod</span><span style="color:#98C379;"> tidy</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 编译并运行程序</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> run</span><span style="color:#98C379;"> session_example.go</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></div><ul><li>通过 GOPATH</li></ul><div class="language-sh line-numbers-mode" data-highlighter="shiki" data-ext="sh" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-sh"><span class="line"><span style="color:#7F848E;font-style:italic;"># get thrift 0.13.0</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> get</span><span style="color:#98C379;"> github.com/apache/thrift@0.13.0</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 递归创建目录</span></span> |
| <span class="line"><span style="color:#61AFEF;">mkdir</span><span style="color:#D19A66;"> -p</span><span style="color:#E06C75;"> $GOPATH</span><span style="color:#98C379;">/src/iotdb-client-go-example/session_example</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 切换到当前目录</span></span> |
| <span class="line"><span style="color:#56B6C2;">cd</span><span style="color:#E06C75;"> $GOPATH</span><span style="color:#98C379;">/src/iotdb-client-go-example/session_example</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 保存文件，自动跳转到新的地址</span></span> |
| <span class="line"><span style="color:#61AFEF;">curl</span><span style="color:#D19A66;"> -o</span><span style="color:#98C379;"> session_example.go</span><span style="color:#D19A66;"> -L</span><span style="color:#98C379;"> https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 初始化 go module 环境</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> mod</span><span style="color:#98C379;"> init</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 下载依赖包</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> mod</span><span style="color:#98C379;"> tidy</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"># 编译并运行程序</span></span> |
| <span class="line"><span style="color:#61AFEF;">go</span><span style="color:#98C379;"> run</span><span style="color:#98C379;"> session_example.go</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></div><ul><li>注意：请勿使用高版本客户端连接低版本服务。</li></ul><h2 id="_2-itablesession-接口" tabindex="-1"><a class="header-anchor" href="#_2-itablesession-接口"><span>2. ITableSession 接口</span></a></h2><h3 id="_2-1-功能描述" tabindex="-1"><a class="header-anchor" href="#_2-1-功能描述"><span>2.1 功能描述</span></a></h3><p>ITableSession 接口定义了与 IoTDB 交互的基本操作，可以执行数据插入、查询操作以及关闭会话等，非线程安全。</p><h3 id="_2-2-方法列表" tabindex="-1"><a class="header-anchor" href="#_2-2-方法列表"><span>2.2 方法列表</span></a></h3><p>以下是 ITableSession 接口中定义的方法及其详细说明：</p><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><th><strong>返回异常</strong></th></tr></thead><tbody><tr><td><code>Insert(tablet *Tablet)</code></td><td>将一个包含时间序列数据的Tablet 插入到数据库中</td><td><code>tablet</code>: 要插入的<code>Tablet</code></td><td><code>TSStatus</code>：执行结果的状态，由 common 包定义。</td><td><code>errer</code>：操作过程中的错误（如连接失败）。</td></tr><tr><td><code>xecuteNonQueryStatement(sql string)</code></td><td>执行非查询 SQL 语句，如 DDL (数据定义语言)或 DML (数据操作语言）命令</td><td><code>sql</code>: 要执行的 SQL 语句。</td><td>同上</td><td>同上</td></tr><tr><td><code>ExecuteQueryStatement (sql string, timeoutInMs *int64)</code></td><td>执行查询 SQL 语句，并返回查询结果集</td><td><code>sql</code>: 要执行的查询 SQL 语句。<code>timeoutInMs</code>: 查询超时时间（毫秒）</td><td><code>SessionDataSet</code>：查询结果数据集。</td><td><code>errer</code>：操作过程中的错误（如连接失败）。</td></tr><tr><td><code>Close()</code></td><td>关闭会话，释放所持有的资源</td><td>无</td><td>无</td><td><code>errer</code>：关闭连接过程中的错误</td></tr></tbody></table><h3 id="_2-3-接口展示" tabindex="-1"><a class="header-anchor" href="#_2-3-接口展示"><span>2.3 接口展示</span></a></h3><ol><li>ITableSession</li></ol><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#7F848E;font-style:italic;">// ITableSession defines an interface for interacting with IoTDB tables.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// It supports operations such as data insertion, executing queries, and closing the session.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Implementations of this interface are expected to manage connections and ensure</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// proper resource cleanup.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Each method may return an error to indicate issues such as connection errors</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// or execution failures.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Since this interface includes a Close method, it is recommended to use</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// defer to ensure the session is properly closed.</span></span> |
| <span class="line"><span style="color:#C678DD;">type</span><span style="color:#E5C07B;"> ITableSession</span><span style="color:#C678DD;"> interface</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Insert inserts a Tablet into the database.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - tablet: A pointer to a Tablet containing time-series data to be inserted.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - r: A pointer to TSStatus indicating the execution result.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - err: An error if an issue occurs during the operation, such as a connection error or execution failure.</span></span> |
| <span class="line"><span style="color:#61AFEF;"> Insert</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">Tablet</span><span style="color:#ABB2BF;">) (</span><span style="color:#E06C75;font-style:italic;">r</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">common</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">TSStatus</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">err</span><span style="color:#C678DD;"> error</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // ExecuteNonQueryStatement executes a non-query SQL statement, such as a DDL or DML command.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - sql: The SQL statement to execute.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - r: A pointer to TSStatus indicating the execution result.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - err: An error if an issue occurs during the operation, such as a connection error or execution failure.</span></span> |
| <span class="line"><span style="color:#61AFEF;"> ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">sql</span><span style="color:#C678DD;"> string</span><span style="color:#ABB2BF;">) (</span><span style="color:#E06C75;font-style:italic;">r</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">common</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">TSStatus</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">err</span><span style="color:#C678DD;"> error</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // ExecuteQueryStatement executes a query SQL statement and returns the result set.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - sql: The SQL query statement to execute.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - timeoutInMs: A pointer to the timeout duration in milliseconds for the query execution. </span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - result: A pointer to SessionDataSet containing the query results.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - err: An error if an issue occurs during the operation, such as a connection error or execution failure.</span></span> |
| <span class="line"><span style="color:#61AFEF;"> ExecuteQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">sql</span><span style="color:#C678DD;"> string</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">timeoutInMs</span><span style="color:#C678DD;"> *int64</span><span style="color:#ABB2BF;">) (</span><span style="color:#C678DD;">*</span><span style="color:#E5C07B;">SessionDataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">error</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Close closes the session, releasing any held resources.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> //</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // - err: An error if there is an issue with closing the IoTDB connection.</span></span> |
| <span class="line"><span style="color:#61AFEF;"> Close</span><span style="color:#ABB2BF;">() (</span><span style="color:#E06C75;font-style:italic;">err</span><span style="color:#C678DD;"> error</span><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 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></div><ol start="2"><li>构造 TableSession</li></ol><ul><li>Config 中不需要手动设置 sqlDialect，使用时只需要使用对应的 NewSession 函数</li></ul><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#C678DD;">type</span><span style="color:#E5C07B;"> Config</span><span style="color:#C678DD;"> struct</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> FetchSize</span><span style="color:#C678DD;"> int32</span></span> |
| <span class="line"><span style="color:#E06C75;"> TimeZone</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> ConnectRetryMax</span><span style="color:#C678DD;"> int</span></span> |
| <span class="line"><span style="color:#E06C75;"> sqlDialect</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Version</span><span style="color:#E5C07B;"> Version</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">type</span><span style="color:#E5C07B;"> ClusterConfig</span><span style="color:#C678DD;"> struct</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> NodeUrls</span><span style="color:#ABB2BF;"> []</span><span style="color:#C678DD;">string</span><span style="color:#7F848E;font-style:italic;"> //ip:port</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> FetchSize</span><span style="color:#C678DD;"> int32</span></span> |
| <span class="line"><span style="color:#E06C75;"> TimeZone</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> ConnectRetryMax</span><span style="color:#C678DD;"> int</span></span> |
| <span class="line"><span style="color:#E06C75;"> sqlDialect</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#C678DD;"> string</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;">// NewTableSession creates a new TableSession instance using the provided configuration.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - config: The configuration for the session.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - enableRPCCompression: A boolean indicating whether RPC compression is enabled.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - connectionTimeoutInMs: The timeout in milliseconds for establishing a connection.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - An ITableSession instance if the session is successfully created.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - An error if there is an issue during session initialization.</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> NewTableSession</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">config</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">Config</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">enableRPCCompression</span><span style="color:#C678DD;"> bool</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">connectionTimeoutInMs</span><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;">) (</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">error</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// NewClusterTableSession creates a new TableSession instance for a cluster setup.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - clusterConfig: The configuration for the cluster session.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - enableRPCCompression: A boolean indicating whether RPC compression is enabled.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - An ITableSession instance if the session is successfully created.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - An error if there is an issue during session initialization.</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> NewClusterTableSession</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">clusterConfig</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">ClusterConfig</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">enableRPCCompression</span><span style="color:#C678DD;"> bool</span><span style="color:#ABB2BF;">) (</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">error</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 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 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></div><blockquote><p>注意：</p><p>通过 <em>NewTableSession 或 NewClusterTableSession</em> 得到的 TableSession，连接已经建立，不需要额外的 open 操作。</p></blockquote><h3 id="_2-4-示例代码" tabindex="-1"><a class="header-anchor" href="#_2-4-示例代码"><span>2.4 示例代码</span></a></h3><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#C678DD;">package</span><span style="color:#E5C07B;"> main</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">import</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#98C379;"> "flag"</span></span> |
| <span class="line"><span style="color:#98C379;"> "log"</span></span> |
| <span class="line"><span style="color:#98C379;"> "math/rand"</span></span> |
| <span class="line"><span style="color:#98C379;"> "strconv"</span></span> |
| <span class="line"><span style="color:#98C379;"> "time"</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#98C379;"> "github.com/apache/iotdb-client-go/v2/client"</span></span> |
| <span class="line"><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> main</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#E06C75;"> flag</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Parse</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> config</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> &</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">Config</span><span style="color:#ABB2BF;">{</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"127.0.0.1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"6667"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"test_session"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">NewTableSession</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">config</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create database test_db"</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"use test_db"</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create table t1 (tag1 string tag, tag2 string tag, s1 text field, s2 text field)"</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> insertRelationalTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#61AFEF;"> showTables</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#61AFEF;"> query</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> getTextValueFromDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">dataSet</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">SessionDataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">columnName</span><span style="color:#C678DD;"> string</span><span style="color:#ABB2BF;">) </span><span style="color:#C678DD;">string</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> isNull</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">IsNull</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">columnName</span><span style="color:#ABB2BF;">); </span><span style="color:#E06C75;">err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> } </span><span style="color:#C678DD;">else</span><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> isNull</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span><span style="color:#98C379;"> "null"</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> v</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetString</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">columnName</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span><span style="color:#E06C75;"> v</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> insertRelationalTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">session</span><span style="color:#E5C07B;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">NewRelationalTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"t1"</span><span style="color:#ABB2BF;">, []</span><span style="color:#C678DD;">*</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">MeasurementSchema</span><span style="color:#ABB2BF;">{</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> Measurement</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"tag1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> DataType</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">STRING</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:#E06C75;"> Measurement</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"tag2"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> DataType</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">STRING</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:#E06C75;"> Measurement</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> DataType</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">TEXT</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:#E06C75;"> Measurement</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"s2"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> DataType</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">TEXT</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 style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">ColumnCategory</span><span style="color:#ABB2BF;">{</span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">TAG</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">TAG</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">FIELD</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">FIELD</span><span style="color:#ABB2BF;">}, </span><span style="color:#D19A66;">1024</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"Failed to create relational tablet {}"</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> ts</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> time</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Now</span><span style="color:#ABB2BF;">().</span><span style="color:#61AFEF;">UTC</span><span style="color:#ABB2BF;">().</span><span style="color:#61AFEF;">UnixNano</span><span style="color:#ABB2BF;">() </span><span style="color:#C678DD;">/</span><span style="color:#D19A66;"> 1000000</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> row</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">row</span><span style="color:#56B6C2;"> <</span><span style="color:#D19A66;"> 16</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">row</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> ts</span><span style="color:#56B6C2;">++</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetTimestamp</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ts</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"tag1_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"tag2_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s1_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s2_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">RowSize</span><span style="color:#56B6C2;">++</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Insert</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">tablet</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Reset</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> row</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">row</span><span style="color:#56B6C2;"> <</span><span style="color:#D19A66;"> 16</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">row</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> ts</span><span style="color:#56B6C2;">++</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetTimestamp</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ts</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"tag1_value_1"</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"tag2_value_1"</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s1_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">2</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s2_value_"</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">), </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#E06C75;"> nullValueColumn</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> rand</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Intn</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">4</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetValueAt</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">nil</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">nullValueColumn</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">row</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">RowSize</span><span style="color:#56B6C2;">++</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Insert</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">tablet</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> showTables</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">session</span><span style="color:#E5C07B;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#E06C75;"> timeout</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> int64</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2000</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"show tables"</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">timeout</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> hasNext</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Next</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#56B6C2;"> !</span><span style="color:#E06C75;">hasNext</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> value</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetString</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"TableName"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Printf</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"tableName is </span><span style="color:#D19A66;">%v</span><span style="color:#98C379;">"</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">value</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:#C678DD;">func</span><span style="color:#61AFEF;"> query</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">session</span><span style="color:#E5C07B;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#E06C75;"> timeout</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> int64</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">2000</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"select * from t1"</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">timeout</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> hasNext</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Next</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#56B6C2;"> !</span><span style="color:#E06C75;">hasNext</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Printf</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"</span><span style="color:#D19A66;">%v</span><span style="color:#D19A66;"> %v</span><span style="color:#D19A66;"> %v</span><span style="color:#D19A66;"> %v</span><span style="color:#98C379;">"</span><span style="color:#ABB2BF;">, </span><span style="color:#61AFEF;">getTextValueFromDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"tag1"</span><span style="color:#ABB2BF;">), </span><span style="color:#61AFEF;">getTextValueFromDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"tag2"</span><span style="color:#ABB2BF;">), </span><span style="color:#61AFEF;">getTextValueFromDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">), </span><span style="color:#61AFEF;">getTextValueFromDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"s2"</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:#C678DD;">func</span><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">err</span><span style="color:#C678DD;"> error</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</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></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 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 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 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 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 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></div><h2 id="_3-tablesessionpool-接口" tabindex="-1"><a class="header-anchor" href="#_3-tablesessionpool-接口"><span>3. TableSessionPool 接口</span></a></h2><h3 id="_3-1-功能描述" tabindex="-1"><a class="header-anchor" href="#_3-1-功能描述"><span>3.1 功能描述</span></a></h3><p>TableSessionPool 是一个用于管理 ITableSession 实例的池。这个池可以帮助我们高效地重用连接，并且在不需要时正确地清理资源, 该接口定义了如何从池中获取会话以及如何关闭池的基本操作。</p><h3 id="_3-2-方法列表" tabindex="-1"><a class="header-anchor" href="#_3-2-方法列表"><span>3.2 方法列表</span></a></h3><table><thead><tr><th><strong>方法名</strong></th><th><strong>描述</strong></th><th><strong>返回值</strong></th><th><strong>返回异常</strong></th></tr></thead><tbody><tr><td><code>GetSession()</code></td><td>从池中获取一个 ITableSession 实例，用于与 IoTDB 交互。</td><td><code>ITableSession </code>实例</td><td><code>error</code>：获取失败的错误原因</td></tr><tr><td><code>Close()</code></td><td>关闭会话池，释放任何持有的资源。关闭后，不能再从池中获取新的会话。</td><td>无</td><td>无</td></tr></tbody></table><h3 id="_3-3-接口展示" tabindex="-1"><a class="header-anchor" href="#_3-3-接口展示"><span>3.3 接口展示</span></a></h3><ol><li>TableSessionPool</li></ol><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#7F848E;font-style:italic;">// TableSessionPool manages a pool of ITableSession instances, enabling efficient</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// reuse and management of resources. It provides methods to acquire a session</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// from the pool and to close the pool, releasing all held resources.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// This implementation ensures proper lifecycle management of sessions,</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// including efficient reuse and cleanup of resources.</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// GetSession acquires an ITableSession instance from the pool.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - A usable ITableSession instance for interacting with IoTDB.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - An error if a session cannot be acquired.</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#ABB2BF;"> (</span><span style="color:#E06C75;font-style:italic;">spool </span><span style="color:#C678DD;">*</span><span style="color:#E5C07B;">TableSessionPool</span><span style="color:#ABB2BF;">) </span><span style="color:#61AFEF;">GetSession</span><span style="color:#ABB2BF;">() (</span><span style="color:#E5C07B;">ITableSession</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">error</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span><span style="color:#E06C75;"> spool</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">getTableSession</span><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;">// Close closes the TableSessionPool, releasing all held resources.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Once closed, no further sessions can be acquired from the pool.</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#ABB2BF;"> (</span><span style="color:#E06C75;font-style:italic;">spool </span><span style="color:#C678DD;">*</span><span style="color:#E5C07B;">TableSessionPool</span><span style="color:#ABB2BF;">) </span><span style="color:#61AFEF;">Close</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 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></div><ol start="2"><li>构造 TableSessionPool</li></ol><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#C678DD;">type</span><span style="color:#E5C07B;"> PoolConfig</span><span style="color:#C678DD;"> struct</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> NodeUrls</span><span style="color:#ABB2BF;"> []</span><span style="color:#C678DD;">string</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> FetchSize</span><span style="color:#C678DD;"> int32</span></span> |
| <span class="line"><span style="color:#E06C75;"> TimeZone</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> ConnectRetryMax</span><span style="color:#C678DD;"> int</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#C678DD;"> string</span></span> |
| <span class="line"><span style="color:#E06C75;"> sqlDialect</span><span style="color:#C678DD;"> string</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;">// NewTableSessionPool creates a new TableSessionPool with the specified configuration.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Parameters:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - conf: PoolConfig defining the configuration for the pool.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - maxSize: The maximum number of sessions the pool can hold.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - connectionTimeoutInMs: Timeout for establishing a connection in milliseconds.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - waitToGetSessionTimeoutInMs: Timeout for waiting to acquire a session in milliseconds.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - enableCompression: A boolean indicating whether to enable compression.</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">//</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Returns:</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// - A TableSessionPool instance.</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> NewTableSessionPool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">conf</span><span style="color:#C678DD;"> *</span><span style="color:#E5C07B;">PoolConfig</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">maxSize</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">connectionTimeoutInMs</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;font-style:italic;">waitToGetSessionTimeoutInMs</span><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;font-style:italic;"> enableCompression</span><span style="color:#C678DD;"> bool</span><span style="color:#ABB2BF;">) </span><span style="color:#E5C07B;">TableSessionPool</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></div><blockquote><p>注意：</p><ul><li>通过 TableSessionPool 得到的 TableSession，如果已经在创建 TableSessionPool 指定了 Database，使用时可以不再指定 Database。</li><li>如果使用过程中通过 use database 指定了其他 database，在 close 放回 TableSessionPool 时会自动恢复为 TableSessionPool 所用的 database。</li></ul></blockquote><h3 id="_3-4-示例代码" tabindex="-1"><a class="header-anchor" href="#_3-4-示例代码"><span>3.4 示例代码</span></a></h3><div class="language-go line-numbers-mode" data-highlighter="shiki" data-ext="go" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-go"><span class="line"><span style="color:#C678DD;">package</span><span style="color:#E5C07B;"> main</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">import</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#98C379;"> "log"</span></span> |
| <span class="line"><span style="color:#98C379;"> "strconv"</span></span> |
| <span class="line"><span style="color:#98C379;"> "sync"</span></span> |
| <span class="line"><span style="color:#98C379;"> "sync/atomic"</span></span> |
| <span class="line"><span style="color:#98C379;"> "time"</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#98C379;"> "github.com/apache/iotdb-client-go/v2/client"</span></span> |
| <span class="line"><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> main</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#61AFEF;"> sessionPoolWithSpecificDatabaseExample</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#61AFEF;"> sessionPoolWithoutSpecificDatabaseExample</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#61AFEF;"> putBackToSessionPoolExample</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> putBackToSessionPoolExample</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // should create database test_db before executing</span></span> |
| <span class="line"><span style="color:#E06C75;"> config</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> &</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">PoolConfig</span><span style="color:#ABB2BF;">{</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"127.0.0.1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"6667"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"test_db"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> sessionPool</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">NewTableSessionPool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">config</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">60000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">4000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#E06C75;"> num</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 4</span></span> |
| <span class="line"><span style="color:#E06C75;"> successGetSessionNum</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> int32</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> var</span><span style="color:#E06C75;"> wg</span><span style="color:#E5C07B;"> sync</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">WaitGroup</span></span> |
| <span class="line"><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Add</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">num</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> i</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;"> <</span><span style="color:#E06C75;"> num</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> dbName</span><span style="color:#E5C07B;"> :=</span><span style="color:#98C379;"> "db"</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">i</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> go</span><span style="color:#C678DD;"> func</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Done</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetSession</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"Failed to create database "</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">dbName</span><span style="color:#C678DD;">+</span><span style="color:#98C379;">"because "</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> atomic</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">AddInt32</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">successGetSessionNum</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#C678DD;"> func</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#E06C75;"> time</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Sleep</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">6</span><span style="color:#C678DD;"> *</span><span style="color:#E06C75;"> time</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">Second</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // put back to session pool</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }()</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create database "</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> dbName</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"use "</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> dbName</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create table table_of_"</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> dbName</span><span style="color:#C678DD;"> +</span><span style="color:#98C379;"> " (tag1 string tag, tag2 string tag, s1 text field, s2 text field)"</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:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Wait</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"success num is"</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">successGetSessionNum</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"All session's database have been reset."</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // the using database will automatically reset to session pool's database after the session closed</span></span> |
| <span class="line"><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Add</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">5</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> i</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;"> <</span><span style="color:#D19A66;"> 5</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> go</span><span style="color:#C678DD;"> func</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Done</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetSession</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"Failed to get session because "</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> timeout</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> int64</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">3000</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"show tables"</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">timeout</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> hasNext</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Next</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#56B6C2;"> !</span><span style="color:#E06C75;">hasNext</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> value</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetString</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"TableName"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"table is"</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">value</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> dataSet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</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:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Wait</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> sessionPoolWithSpecificDatabaseExample</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // should create database test_db before executing</span></span> |
| <span class="line"><span style="color:#E06C75;"> config</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> &</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">PoolConfig</span><span style="color:#ABB2BF;">{</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"127.0.0.1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"6667"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Database</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"test_db"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> sessionPool</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">NewTableSessionPool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">config</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">60000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">8000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> num</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 10</span></span> |
| <span class="line"><span style="color:#C678DD;"> var</span><span style="color:#E06C75;"> wg</span><span style="color:#E5C07B;"> sync</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">WaitGroup</span></span> |
| <span class="line"><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Add</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">num</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> i</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;"> <</span><span style="color:#E06C75;"> num</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> tableName</span><span style="color:#E5C07B;"> :=</span><span style="color:#98C379;"> "t"</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">i</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> go</span><span style="color:#C678DD;"> func</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Done</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetSession</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"Failed to create table "</span><span style="color:#C678DD;">+</span><span style="color:#E06C75;">tableName</span><span style="color:#C678DD;">+</span><span style="color:#98C379;">"because "</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create table "</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> tableName</span><span style="color:#C678DD;"> +</span><span style="color:#98C379;"> " (tag1 string tag, tag2 string tag, s1 text field, s2 text field)"</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:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Wait</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> sessionPoolWithoutSpecificDatabaseExample</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#E06C75;"> config</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> &</span><span style="color:#E5C07B;">client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">PoolConfig</span><span style="color:#ABB2BF;">{</span></span> |
| <span class="line"><span style="color:#E06C75;"> Host</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"127.0.0.1"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"6667"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#E06C75;"> sessionPool</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">NewTableSessionPool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">config</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">3</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">60000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">8000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> num</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 10</span></span> |
| <span class="line"><span style="color:#C678DD;"> var</span><span style="color:#E06C75;"> wg</span><span style="color:#E5C07B;"> sync</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">WaitGroup</span></span> |
| <span class="line"><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Add</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">num</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> i</span><span style="color:#E5C07B;"> :=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;"> <</span><span style="color:#E06C75;"> num</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">i</span><span style="color:#56B6C2;">++</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> dbName</span><span style="color:#E5C07B;"> :=</span><span style="color:#98C379;"> "db"</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> strconv</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Itoa</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">i</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> go</span><span style="color:#C678DD;"> func</span><span style="color:#ABB2BF;">() {</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Done</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetSession</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"Failed to create database "</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">dbName</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> defer</span><span style="color:#E06C75;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Close</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create database "</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> dbName</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"use "</span><span style="color:#C678DD;"> +</span><span style="color:#E06C75;"> dbName</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">ExecuteNonQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"create table t1 (tag1 string tag, tag2 string tag, s1 text field, s2 text field)"</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:#E06C75;"> wg</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Wait</span><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:#C678DD;">func</span><span style="color:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">err</span><span style="color:#C678DD;"> error</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> err</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> log</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Fatal</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">err</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></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 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