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class="page-info"><!----><!----><span class="page-date-info" aria-label="Writing Date📅" 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">7/10/23</span><meta property="datePublished" content="2023-07-10T03:11:17.000Z"></span><!----><span class="page-reading-time-info" aria-label="Reading Time⌛" 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>About 7 min</span><meta property="timeRequired" content="PT7M"></span><!----><!----></div><hr></div><!----><div class="" vp-content><!----><div id="markdown-content"><h1 id="go-native-api" tabindex="-1"><a class="header-anchor" href="#go-native-api"><span>Go Native API</span></a></h1><p>The Go Native API supports interaction with the database through both <code>Session</code> and <code>SessionPool</code> methods. Since <code>Session</code> is not thread-safe, using <code>SessionPool</code> is strongly recommended for programming. In multi-threaded concurrent scenarios, <code>SessionPool</code> can reasonably manage and allocate connection resources to enhance system performance and resource utilization efficiency.</p><p>This article focuses on the usage of <code>SessionPool</code>, covering the complete process from environment preparation and core operation steps to the full set of interfaces.</p><h2 id="_1-environment-preparation" tabindex="-1"><a class="header-anchor" href="#_1-environment-preparation"><span>1. Environment Preparation</span></a></h2><h3 id="_1-1-prerequisites" tabindex="-1"><a class="header-anchor" href="#_1-1-prerequisites"><span>1.1 Prerequisites</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, or other Unix-like systems</li><li>Windows + bash (Git is needed to download the IoTDB Go client; any one of WSL, cygwin, or Git Bash is acceptable)</li></ul><h3 id="_1-2-installation-methods" tabindex="-1"><a class="header-anchor" href="#_1-2-installation-methods"><span>1.2 Installation Methods</span></a></h3><ul><li><p><strong>Using go mod</strong></p><div class="language-bash line-numbers-mode" data-highlighter="shiki" data-ext="bash" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-bash"><span class="line"><span style="color:#7F848E;font-style:italic;"># Switch to the HOME path of GOPATH and enable the Go Modules feature</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;"># Configure the GOPROXY environment variable</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;"># Create a named folder or directory and switch to it</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;"># Save the file, which will automatically redirect to the new address</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;"># Initialize the go module environment</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;"># Download dependency packages</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;"># Compile and run the program</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></li><li><p><strong>Using GOPATH</strong></p><div class="language-bash line-numbers-mode" data-highlighter="shiki" data-ext="bash" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code class="language-bash"><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;"># Recursively create the directory</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;"># Switch to the current directory</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;"># Save the file, which will automatically redirect to the new address</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;"># Initialize the go module environment</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;"># Download dependency packages</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;"># Compile and run the program</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></li></ul><ul><li>Note: Do not use a newer client to connect to an older server, as this may cause connection failures or unexpected errors.</li></ul><h2 id="_2-core-steps" tabindex="-1"><a class="header-anchor" href="#_2-core-steps"><span>2. Core Steps</span></a></h2><p>The three core steps for using the Go native interface to operate IoTDB are as follows:</p><ol><li><strong>Create a connection pool instance</strong>: Initialize a <code>SessionPool</code> object, configuring connection parameters and pool size.</li><li><strong>Execute database operations</strong>: <code>GetSession()</code> from the pool, perform operations like data writing or querying, and <strong>must</strong> <code>PutBack(session)</code> upon completion.</li><li><strong>Close connection pool resources</strong>: Call <code>sessionPool.Close()</code> at the end of the program to release all connections.</li></ol><p>The following sections illustrate the core development workflow and do not demonstrate all parameters and interfaces. For the complete functionality and parameters, please refer to: <strong><a class="route-link" href="/UserGuide/latest/API/Programming-Go-Native-API.html#_3-full-interface-list">Full Interface Description</a></strong> or check: <strong><a href="https://github.com/apache/iotdb-client-go/blob/main/example/session_pool/session_pool_example.go" target="_blank" rel="noopener noreferrer">SessionPool Example Source Code</a></strong></p><h3 id="_2-1-create-connection-pool-instance" tabindex="-1"><a class="header-anchor" href="#_2-1-create-connection-pool-instance"><span>2.1 Create Connection Pool Instance</span></a></h3><ul><li><p><strong>Single Instance</strong></p><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:#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:#E06C75;">host</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">port</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">user</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">password</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;">NewSessionPool</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;">60000</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></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></div></li><li><p><strong>Distributed or Active-Active</strong></p><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:#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;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">user</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">password</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> NodeUrls</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">strings</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Split</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"127.0.0.1:6667,127.0.0.1:6668"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">","</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;">NewSessionPool</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;">60000</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></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></li></ul><h3 id="_2-2-database-operations" tabindex="-1"><a class="header-anchor" href="#_2-2-database-operations"><span>2.2 Database Operations</span></a></h3><h4 id="_2-2-1-data-insertion" tabindex="-1"><a class="header-anchor" href="#_2-2-1-data-insertion"><span>2.2.1 Data Insertion</span></a></h4><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:#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;">defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#E06C75;">status</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;">InsertTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">tablet</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</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;">Reset</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;">status</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</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></div><h4 id="_2-2-2-data-query" tabindex="-1"><a class="header-anchor" href="#_2-2-2-data-query"><span>2.2.2 Data Query</span></a></h4><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;">var</span><span style="color:#E06C75;"> timeout</span><span style="color:#C678DD;"> int64</span><span style="color:#E5C07B;"> =</span><span style="color:#D19A66;"> 1000</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;">defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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;">Print</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;">sessionDataSet</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:#E06C75;">sql</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;">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:#C678DD;"> defer</span><span style="color:#E06C75;"> sessionDataSet</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;"> printDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">sessionDataSet</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;">} </span><span style="color:#C678DD;">else</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:#E06C75;">err</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></div><h3 id="_2-3-usage-example" tabindex="-1"><a class="header-anchor" href="#_2-3-usage-example"><span>2.3 Usage Example</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;">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;"> "fmt"</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;"> "strings"</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:#98C379;"> "github.com/apache/iotdb-client-go/v2/common"</span></span> |
| <span class="line"><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;">var</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;"> user</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:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#C678DD;">var</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#E5C07B;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E5C07B;">SessionPool</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;">StringVar</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">host</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"host"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"127.0.0.1"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"--host=192.168.1.100"</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;">StringVar</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">port</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"port"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"6667"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"--port=6667"</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;">StringVar</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">user</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"user"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"--user=root"</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;">StringVar</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">&</span><span style="color:#E06C75;">password</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"password"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"root"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"--password=root"</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> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // 1. Create connection pool</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:#E06C75;">host</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Port</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">port</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> UserName</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">user</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#E06C75;"> Password</span><span style="color:#ABB2BF;">: </span><span style="color:#E06C75;">password</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;">NewSessionPool</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;">60000</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></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:#7F848E;font-style:italic;"> // 2. Create storage group</span></span> |
| <span class="line"><span style="color:#61AFEF;"> setStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"root.sg1"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // 3. Create time series</span></span> |
| <span class="line"><span style="color:#61AFEF;"> createTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"root.sg1.dev1.temperature"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // 4. Data insertion</span></span> |
| <span class="line"><span style="color:#61AFEF;"> insertTablet</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // 5. Data query</span></span> |
| <span class="line"><span style="color:#61AFEF;"> executeQueryStatement</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"select temperature from root.sg1.dev1"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // 6. Deletion</span></span> |
| <span class="line"><span style="color:#61AFEF;"> deleteTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"root.sg1.dev1.temperature"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#61AFEF;"> deleteStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"root.sg1"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Set storage group</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> setStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">sg</span><span style="color:#C678DD;"> string</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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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;"> session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">SetStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">sg</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Delete storage group</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> deleteStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">sg</span><span style="color:#C678DD;"> string</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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">DeleteStorageGroup</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">sg</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Create time series</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> createTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">path</span><span style="color:#C678DD;"> string</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> var</span><span style="color:#ABB2BF;"> (</span></span> |
| <span class="line"><span style="color:#E06C75;"> dataType</span><span style="color:#E5C07B;"> =</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">FLOAT</span></span> |
| <span class="line"><span style="color:#E06C75;"> encoding</span><span style="color:#E5C07B;"> =</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">PLAIN</span></span> |
| <span class="line"><span style="color:#E06C75;"> compressor</span><span style="color:#E5C07B;"> =</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#E06C75;">SNAPPY</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;"> 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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">CreateTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">path</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">dataType</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">encoding</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">compressor</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">nil</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">nil</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Delete time series</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> deleteTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">paths</span><span style="color:#ABB2BF;"> ...</span><span style="color:#C678DD;">string</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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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:#61AFEF;"> checkError</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">DeleteTimeseries</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">paths</span><span style="color:#ABB2BF;">))</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Insert Tablet data</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> insertTablet</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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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:#C678DD;"> if</span><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:#61AFEF;"> createTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">12</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;"> status</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;">InsertTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">tablet</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">false</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;">Reset</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;">status</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:#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> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Create Tablet</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> createTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">rowCount</span><span style="color:#C678DD;"> int</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;">Tablet</span><span style="color:#ABB2BF;">, </span><span style="color:#C678DD;">error</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;">NewTablet</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"root.sg1.dev1"</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;">"temperature"</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;">FLOAT</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:#E06C75;">rowCount</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"></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:#C678DD;"> return</span><span style="color:#D19A66;"> nil</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</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:#C678DD;"> int</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">rowCount</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:#E06C75;">rand</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Float32</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:#E06C75;">RowSize</span><span style="color:#56B6C2;">++</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#C678DD;"> return</span><span style="color:#E06C75;"> tablet</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">nil</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;">// Execute query statement</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><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> |
| <span class="line"><span style="color:#C678DD;"> var</span><span style="color:#E06C75;"> timeout</span><span style="color:#C678DD;"> int64</span><span style="color:#E5C07B;"> =</span><span style="color:#D19A66;"> 1000</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;"> defer</span><span style="color:#E06C75;"> sessionPool</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">PutBack</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">session</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;">Print</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;"> sessionDataSet</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:#E06C75;">sql</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;"> 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:#C678DD;"> defer</span><span style="color:#E06C75;"> sessionDataSet</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;"> printDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">sessionDataSet</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> } </span><span style="color:#C678DD;">else</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:#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> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Print query results</span></span> |
| <span class="line"><span style="color:#C678DD;">func</span><span style="color:#61AFEF;"> printDataSet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;font-style:italic;">sds</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> |
| <span class="line"><span style="color:#E06C75;"> columnNames</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sds</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">GetColumnNames</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> _</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">value</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> range</span><span style="color:#E06C75;"> columnNames</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> fmt</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;">%s</span><span style="color:#56B6C2;">\t</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:#E06C75;"> fmt</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#E06C75;"> next</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sds</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Next</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:#56B6C2;"> &&</span><span style="color:#E06C75;"> next</span><span style="color:#ABB2BF;">; </span><span style="color:#E06C75;">next</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">err</span><span style="color:#E5C07B;"> =</span><span style="color:#E06C75;"> sds</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;"> for</span><span style="color:#E06C75;"> _</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">columnName</span><span style="color:#E5C07B;"> :=</span><span style="color:#C678DD;"> range</span><span style="color:#E06C75;"> columnNames</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> isNull</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">_</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sds</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> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> isNull</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> fmt</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:#56B6C2;">\t\t</span><span style="color:#98C379;">"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"null"</span><span style="color:#ABB2BF;">)</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> } </span><span style="color:#C678DD;">else</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#E06C75;"> v</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">_</span><span style="color:#E5C07B;"> :=</span><span style="color:#E06C75;"> sds</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:#E06C75;"> fmt</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:#56B6C2;">\t\t</span><span style="color:#98C379;">"</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">v</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;"> fmt</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">Println</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;">}</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;">// Check error</span></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;">status</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 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> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#E06C75;"> status</span><span style="color:#56B6C2;"> !=</span><span style="color:#D19A66;"> nil</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:#E5C07B;"> =</span><span style="color:#E06C75;"> client</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">VerifySuccess</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">status</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;">Println</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> |
| <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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class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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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class="line-number"></div></div></div><h2 id="_3-full-interface-list" tabindex="-1"><a class="header-anchor" href="#_3-full-interface-list"><span>3. Full Interface List</span></a></h2><h3 id="_3-1-sessionpool-management-interfaces" tabindex="-1"><a class="header-anchor" href="#_3-1-sessionpool-management-interfaces"><span>3.1 SessionPool Management Interfaces</span></a></h3><table><thead><tr><th style="text-align:left;">Interface Name</th><th style="text-align:left;">Function Description</th><th style="text-align:left;">Parameter Description</th></tr></thead><tbody><tr><td style="text-align:left;"><code>NewSessionPool(config *PoolConfig, maxSize, connTimeoutMs, waitTimeoutMs int, enableComp bool) SessionPool</code></td><td style="text-align:left;">Creates and returns a Session connection pool instance.</td><td style="text-align:left;"><code>config</code>: Pool configuration<br> <code>maxSize</code>: Maximum connections (≤0 uses CPU count * 5)<br><code>connTimeoutMs</code>: TCP connection timeout (ms)<br><code>waitTimeoutMs</code>: Session acquisition wait timeout (ms)<br><code>enableComp</code>: Whether to enable compression</td></tr><tr><td style="text-align:left;"><code>GetSession() (Session, error)</code></td><td style="text-align:left;">Gets an available Session from the pool. Blocks if the pool is full, returns error on timeout. Must be paired with <code>PutBack</code>.</td><td style="text-align:left;">None</td></tr><tr><td style="text-align:left;"><code>PutBack(session Session)</code></td><td style="text-align:left;">Returns a used Session back to the connection pool.</td><td style="text-align:left;"><code>session</code>: The instance obtained from <code>GetSession</code></td></tr><tr><td style="text-align:left;"><code>Close()</code></td><td style="text-align:left;">Closes the connection pool, releasing all active connections. Must be called before program exit.</td><td style="text-align:left;">None</td></tr></tbody></table><h3 id="_3-2-data-insertion-interfaces" tabindex="-1"><a class="header-anchor" href="#_3-2-data-insertion-interfaces"><span>3.2 Data Insertion Interfaces</span></a></h3><p><em>The following interfaces are called via the obtained Session.</em></p><table><thead><tr><th style="text-align:left;">Interface Name</th><th style="text-align:left;">Function Description</th><th style="text-align:left;">Parameter Description</th></tr></thead><tbody><tr><td style="text-align:left;"><code>InsertRecord(deviceId string, measurements []string, dataTypes []TSDataType, values []interface{}, timestamp int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts a single record.</td><td style="text-align:left;"><code>deviceId</code>: Device ID <br><code>measurements</code>: Measurement list<br><code>dataTypes</code>: Data type list<br><code>values</code>: Value list<br><code>timestamp</code>: Timestamp</td></tr><tr><td style="text-align:left;"><code>InsertAlignedRecord(deviceId string, measurements []string, dataTypes []TSDataType, values []interface{}, timestamp int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts a single aligned record.</td><td style="text-align:left;"><code>deviceId</code>: Device ID<br><code>measurements</code>: Measurement list<br><code>dataTypes</code>: Data type list<br><code>values</code>: Value list<br><code>timestamp</code>: Timestamp</td></tr><tr><td style="text-align:left;"><code>InsertStringRecord(deviceId string, measurements []string, values []string, timestamp int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts a single record in string format.</td><td style="text-align:left;"><code>deviceId</code>: Device ID<br><code>measurements</code>: Measurement list<br><code>values</code>: String-type value list<br><code>timestamp</code>: Timestamp</td></tr><tr><td style="text-align:left;"><code>InsertRecords(deviceIds []string, measurements [][]string, dataTypes [][]TSDataType, values [][]interface{}, timestamps []int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts multiple records for multiple devices.</td><td style="text-align:left;"><code>deviceIds</code>: Device ID list<br><code>measurements</code>: 2D measurement list<br><code>dataTypes</code>: 2D data type list<br><code>values</code>: 2D value list<br><code>timestamps</code>: Timestamp list</td></tr><tr><td style="text-align:left;"><code>InsertAlignedRecords(deviceIds []string, measurements [][]string, dataTypes [][]TSDataType, values [][]interface{}, timestamps []int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts multiple records for multiple aligned devices.</td><td style="text-align:left;"><code>deviceIds</code>: Device ID list<br><code>measurements</code>: 2D measurement list<br><code>dataTypes</code>: 2D data type list<br><code>values</code>: 2D value list<br><code>timestamps</code>: Timestamp list</td></tr><tr><td style="text-align:left;"><code>InsertTablet(tablet Tablet, sorted bool) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts multiple rows of data for a single device.</td><td style="text-align:left;"><code>tablet</code>: The Tablet data to insert<br><code>sorted</code>: Whether the data is sorted</td></tr><tr><td style="text-align:left;"><code>InsertAlignedTablet(tablet Tablet, sorted bool) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Inserts multiple rows of data for a single aligned device.</td><td style="text-align:left;"><code>tablet</code>: The Tablet data to insert<br><code>sorted</code>: Whether the data is sorted</td></tr><tr><td style="text-align:left;"><code>InsertTablets(tablets []Tablet, sorted bool) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Batch inserts multiple Tablet data.</td><td style="text-align:left;"><code>tablets</code>: Multiple Tablet data to insert<br><code>sorted</code>: Whether the data is sorted</td></tr><tr><td style="text-align:left;"><code>InsertAlignedTablets(tablets []Tablet, sorted bool) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Batch inserts multiple aligned devices' data.</td><td style="text-align:left;"><code>tablets</code>: Multiple Tablet data to insert<br><code>sorted</code>: Whether the data is sorted</td></tr></tbody></table><h3 id="_3-3-sql-and-query-interfaces" tabindex="-1"><a class="header-anchor" href="#_3-3-sql-and-query-interfaces"><span>3.3 SQL and Query Interfaces</span></a></h3><p><em>The following interfaces are called via the obtained Session.</em></p><table><thead><tr><th style="text-align:left;">Interface Name</th><th style="text-align:left;">Function Description</th><th style="text-align:left;">Parameter Description</th></tr></thead><tbody><tr><td style="text-align:left;"><code>ExecuteStatement(sql string)(SessionDataSet, error)</code></td><td style="text-align:left;">Executes SQL (primarily for queries), returns a SessionDataSet.</td><td style="text-align:left;"><code>sql</code>: The SQL query statement to execute</td></tr><tr><td style="text-align:left;"><code>ExecuteQueryStatement(sql string, timeoutMs *int64) (SessionDataSet, error)</code></td><td style="text-align:left;">Executes a query SQL with optional timeout, returns a SessionDataSet.</td><td style="text-align:left;"><code>sql</code>: The SQL query statement to execute <br> <code>timeoutMs</code>: Query timeout time (milliseconds)</td></tr><tr><td style="text-align:left;"><code>ExecuteNonQueryStatement(sql string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Executes SQL that does not return a result set (e.g., INSERT, CREATE, DELETE).</td><td style="text-align:left;"><code>sql</code>: The SQL statement to execute</td></tr><tr><td style="text-align:left;"><code>ExecuteRawDataQuery(paths []string, startTime int64, endTime int64) (*SessionDataSet, error)</code></td><td style="text-align:left;">Queries raw data for specified time series within a time range.</td><td style="text-align:left;"><code>paths</code>: Query path list <br><code>startTime</code>: Start timestamp<br><code>endTime</code>: End timestamp</td></tr><tr><td style="text-align:left;"><code>ExecuteAggregationQuery(paths []string, aggregations []common.TAggregationType, startTime, endTime, interval, timeoutMs int64) (SessionDataSet, error)</code></td><td style="text-align:left;">Executes an aggregation query (COUNT, AVG, etc.).</td><td style="text-align:left;"><code>paths</code>: Query path list<br><code>aggregations</code>: Aggregation type list<br><code>startTime, endTime, interval</code>: Start time, end time, and interval<br><code>timeoutMs</code>: Query timeout time</td></tr><tr><td style="text-align:left;"><code>ExecuteBatchStatement(sqls []string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Executes multiple SQL statements in batch.</td><td style="text-align:left;"><code>sqls</code>: The SQL statements to execute</td></tr></tbody></table><h3 id="_3-4-metadata-operation-interfaces" tabindex="-1"><a class="header-anchor" href="#_3-4-metadata-operation-interfaces"><span>3.4 Metadata Operation Interfaces</span></a></h3><p><em>The following interfaces are called via the obtained Session.</em></p><table><thead><tr><th style="text-align:left;">Interface Name</th><th style="text-align:left;">Function Description</th><th style="text-align:left;">Parameter Description</th></tr></thead><tbody><tr><td style="text-align:left;"><code>SetStorageGroup(storageGroupId string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Creates a database (storage group).</td><td style="text-align:left;"><code>storageGroupId</code>: Database (storage group) name</td></tr><tr><td style="text-align:left;"><code>DeleteStorageGroup(storageGroupId string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Deletes a database (storage group).</td><td style="text-align:left;"><code>storageGroupId</code>: The database (storage group) name to delete</td></tr><tr><td style="text-align:left;"><code>DeleteStorageGroups(storageGroupIds ...string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Deletes multiple databases (storage groups).</td><td style="text-align:left;"><code>storageGroupIds</code>: The list of database (storage group) names to delete</td></tr><tr><td style="text-align:left;"><code>CreateTimeseries(path string, dataType TSDataType, encoding TSEncoding, compressor TSCompressionType, attributes map[string]string, tags map[string]string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Creates a non-aligned time series.</td><td style="text-align:left;"><code>path</code>: Time series path<br><code>dataType</code>: Data type<br><code>encoding</code>: Encoding method<br><code>compressor</code>: Compression algorithm<br><code>attributes</code>: (Optional) Series attributes<br><code>tags</code>: (Optional) Series tags</td></tr><tr><td style="text-align:left;"><code>CreateAlignedTimeseries(prefixPath string, measurements []string, dataTypes []TSDataType, encodings []TSEncoding, compressors []TSCompressionType, measurementAlias []string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Creates a group of aligned time series.</td><td style="text-align:left;"><code>prefixPath</code>: Time series path prefix <br><code>measurements</code>: Measurement name list<br><code>dataTypes, encodings, compressors</code>: Data type, encoding, and compressor list for each measurement<br><code>measurementAlias</code>: (Optional) Alias list for each measurement</td></tr><tr><td style="text-align:left;"><code>DeleteTimeseries(paths []string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Deletes multiple time series (including their data).</td><td style="text-align:left;"><code>paths</code>: The list of time series paths to delete</td></tr><tr><td style="text-align:left;"><code>DeleteData(paths []string, startTime int64, endTime int64) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Deletes data within a time period for specified time series (metadata is preserved).</td><td style="text-align:left;"><code>paths</code>: The list of time series paths<br><code>startTime</code>: Start timestamp<br><code>endTime</code>: End timestamp</td></tr><tr><td style="text-align:left;"><code>SetTimeZone(timeZone string) (r common.TSStatus, err error)</code></td><td style="text-align:left;">Sets the time zone for the current session.</td><td style="text-align:left;"><code>timeZone</code>: Time zone string, e.g., "UTC", "Asia/Shanghai", "GMT+8"</td></tr><tr><td style="text-align:left;"><code>GetTimeZone() (string, error)</code></td><td style="text-align:left;">Gets the time zone of the current session.</td><td style="text-align:left;">None</td></tr></tbody></table><h3 id="_3-5-key-configuration-structure-poolconfig" tabindex="-1"><a class="header-anchor" href="#_3-5-key-configuration-structure-poolconfig"><span>3.5 Key Configuration Structure (PoolConfig)</span></a></h3><table><thead><tr><th style="text-align:left;">Field</th><th style="text-align:left;">Type</th><th style="text-align:left;">Required</th><th style="text-align:left;">Description</th></tr></thead><tbody><tr><td style="text-align:left;"><code>Host</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">Choose one with <code>NodeUrls</code></td><td style="text-align:left;">Single-node host address.</td></tr><tr><td style="text-align:left;"><code>Port</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">Choose one with <code>NodeUrls</code></td><td style="text-align:left;">Single-node port.</td></tr><tr><td style="text-align:left;"><code>NodeUrls</code></td><td style="text-align:left;"><code>[]string</code></td><td style="text-align:left;">Choose one with <code>Host</code>/<code>Port</code></td><td style="text-align:left;">Cluster node address list, format: <code>"host:port"</code>.</td></tr><tr><td style="text-align:left;"><code>UserName</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">Yes</td><td style="text-align:left;">Username.</td></tr><tr><td style="text-align:left;"><code>Password</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">Yes</td><td style="text-align:left;">Password.</td></tr><tr><td style="text-align:left;"><code>FetchSize</code></td><td style="text-align:left;"><code>int32</code></td><td style="text-align:left;">No</td><td style="text-align:left;">Query result set fetch size, default 1024.</td></tr><tr><td style="text-align:left;"><code>TimeZone</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">No</td><td style="text-align:left;">Session time zone, e.g., "Asia/Shanghai". Default uses server time zone.</td></tr><tr><td style="text-align:left;"><code>Database</code></td><td style="text-align:left;"><code>string</code></td><td style="text-align:left;">No</td><td style="text-align:left;">For table mode; used to set the session's default database.</td></tr></tbody></table></div><!----><!----><!----></div><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/latest/API/Programming-Go-Native-API.md" aria-label="Found Error? 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