import{_ as t,r as p,o as c,c as l,b as n,d as s,a as o,w as i,e as a}from"./app-CZ10EDbW.js";const u={},d=a(`<h1 id="应用编程接口" tabindex="-1"><a class="header-anchor" href="#应用编程接口"><span>应用编程接口</span></a></h1><h2 id="java-原生接口" tabindex="-1"><a class="header-anchor" href="#java-原生接口"><span>Java 原生接口</span></a></h2><h3 id="安装" tabindex="-1"><a class="header-anchor" href="#安装"><span>安装</span></a></h3><h3 id="依赖" tabindex="-1"><a class="header-anchor" href="#依赖"><span>依赖</span></a></h3><ul><li>JDK &gt;= 1.8</li><li>Maven &gt;= 3.6</li></ul><h3 id="安装方法" tabindex="-1"><a class="header-anchor" href="#安装方法"><span>安装方法</span></a></h3><p>在根目录下运行：</p><div class="language-bash line-numbers-mode" data-ext="sh" data-title="sh"><pre class="language-bash"><code>mvn clean <span class="token function">install</span> <span class="token parameter variable">-pl</span> session <span class="token parameter variable">-am</span> <span class="token parameter variable">-Dmaven.test.skip</span><span class="token operator">=</span>true
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="在-maven-中使用原生接口" tabindex="-1"><a class="header-anchor" href="#在-maven-中使用原生接口"><span>在 MAVEN 中使用原生接口</span></a></h3><div class="language-xml line-numbers-mode" data-ext="xml" data-title="xml"><pre class="language-xml"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependencies</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">&gt;</span></span>org.apache.iotdb<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">&gt;</span></span>iotdb-session<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">&gt;</span></span>0.13.0-SNAPSHOT<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependencies</span><span class="token punctuation">&gt;</span></span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="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="语法说明" tabindex="-1"><a class="header-anchor" href="#语法说明"><span>语法说明</span></a></h3>`,11),k=n("li",null,[s("对于其他接口： "),n("ul",null,[n("li",null,[s("经参数传入的路径或路径前缀中的节点： "),n("ul",null,[n("li",null,"在 SQL 语句中需要使用反引号（`）进行转义的，此处均不需要进行转义。"),n("li",null,"使用单引号或双引号括起的节点，仍需要使用单引号或双引号括起，并且要针对 JAVA 字符串进行反转义。"),n("li",null,[s("对于 "),n("code",null,"checkTimeseriesExists"),s(" 接口，由于内部调用了 IoTDB-SQL 接口，因此需要和 SQL 语法规范保持一致，并且针对 JAVA 字符串进行反转义。")])])]),n("li",null,"经参数传入的标识符（如模板名）：在 SQL 语句中需要使用反引号（`）进行转义的，此处均不需要进行转义。")])],-1),r=a(`<h3 id="基本接口说明" tabindex="-1"><a class="header-anchor" href="#基本接口说明"><span>基本接口说明</span></a></h3><p>下面将给出 Session 对应的接口的简要介绍和对应参数：</p><h4 id="初始化" tabindex="-1"><a class="header-anchor" href="#初始化"><span>初始化</span></a></h4><ul><li>初始化 Session</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token comment">// 全部使用默认配置</span>
session <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 指定一个可连接节点</span>
session <span class="token operator">=</span> 
    <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">host</span><span class="token punctuation">(</span><span class="token class-name">String</span> host<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">port</span><span class="token punctuation">(</span><span class="token keyword">int</span> port<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 指定多个可连接节点</span>
session <span class="token operator">=</span> 
    <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">nodeUrls</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> nodeUrls<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 其他配置项</span>
session <span class="token operator">=</span> 
    <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">fetchSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> fetchSize<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">username</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">password</span><span class="token punctuation">(</span><span class="token class-name">String</span> password<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">thriftDefaultBufferSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> thriftDefaultBufferSize<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">thriftMaxFrameSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> thriftMaxFrameSize<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">enableCacheLeader</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> enableCacheLeader<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">version</span><span class="token punctuation">(</span><span class="token class-name">Version</span> version<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>其中，version 表示客户端使用的 SQL 语义版本，用于升级 0.13 时兼容 0.12 的 SQL 语义，可能取值有：<code>V_0_12</code>、<code>V_0_13</code>。</p><ul><li>开启 Session</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token keyword">open</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>开启 Session，并决定是否开启 RPC 压缩</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token keyword">open</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> enableRPCCompression<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>注意: 客户端的 RPC 压缩开启状态需和服务端一致</p><ul><li>关闭 Session</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="数据定义接口-ddl" tabindex="-1"><a class="header-anchor" href="#数据定义接口-ddl"><span>数据定义接口 DDL</span></a></h4><h5 id="存储组管理" tabindex="-1"><a class="header-anchor" href="#存储组管理"><span>存储组管理</span></a></h5><ul><li>设置存储组</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">setStorageGroup</span><span class="token punctuation">(</span><span class="token class-name">String</span> storageGroupId<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>删除单个或多个存储组</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteStorageGroup</span><span class="token punctuation">(</span><span class="token class-name">String</span> storageGroup<span class="token punctuation">)</span>
<span class="token keyword">void</span> <span class="token function">deleteStorageGroups</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> storageGroups<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h5 id="时间序列管理" tabindex="-1"><a class="header-anchor" href="#时间序列管理"><span>时间序列管理</span></a></h5><ul><li>创建单个或多个时间序列</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">createTimeseries</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">,</span> <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span>
      <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span> <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">,</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> props<span class="token punctuation">,</span>
      <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> tags<span class="token punctuation">,</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> attributes<span class="token punctuation">,</span> <span class="token class-name">String</span> measurementAlias<span class="token punctuation">)</span>
      
<span class="token keyword">void</span> <span class="token function">createMultiTimeseries</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span></span> dataTypes<span class="token punctuation">,</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">TSEncoding</span><span class="token punctuation">&gt;</span></span> encodings<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">CompressionType</span><span class="token punctuation">&gt;</span></span> compressors<span class="token punctuation">,</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> propsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> tagsList<span class="token punctuation">,</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> attributesList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurementAliasList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>创建对齐时间序列</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>void createAlignedTimeseries(String prefixPath, List&lt;String&gt; measurements,
      List&lt;TSDataType&gt; dataTypes, List&lt;TSEncoding&gt; encodings,
      CompressionType compressor, List&lt;String&gt; measurementAliasList);
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>注意：目前<strong>暂不支持</strong>使用传感器别名。</p><ul><li>删除一个或多个时间序列</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteTimeseries</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">)</span>
<span class="token keyword">void</span> <span class="token function">deleteTimeseries</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>检测时间序列是否存在</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">boolean</span> <span class="token function">checkTimeseriesExists</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h5 id="元数据模版" tabindex="-1"><a class="header-anchor" href="#元数据模版"><span>元数据模版</span></a></h5><ul><li>创建元数据模板，可以通过先后创建<code>Template</code>、<code>MeasurementNode</code>的对象，描述模板内物理量结构与类型、编码方式、压缩方式等信息，并通过以下接口创建模板</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">createSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">Template</span> template<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token class-name">Class</span> <span class="token class-name">Template</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">boolean</span> directShareTime<span class="token punctuation">;</span>
    <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Node</span><span class="token punctuation">&gt;</span></span> children<span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token class-name">Template</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token keyword">boolean</span> isShareTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
    
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addToTemplate</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteFromTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setShareTime</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> shareTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token class-name">Abstract</span> <span class="token class-name">Class</span> <span class="token class-name">Node</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addChild</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteChild</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token class-name">Class</span> <span class="token class-name">MeasurementNode</span> <span class="token keyword">extends</span> <span class="token class-name">Node</span> <span class="token punctuation">{</span>
    <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">;</span>
    <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">;</span>
    <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> 
                           <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span> 
                           <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span>
                          <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>通过上述类的实例描述模板时，<code>Template</code>内应当仅能包含单层的<code>MeasurementNode</code>，具体可以参见如下示例：</p><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token class-name">MeasurementNode</span> nodeX <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">&quot;x&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span><span class="token constant">FLOAT</span><span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span><span class="token constant">RLE</span><span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span><span class="token constant">SNAPPY</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">MeasurementNode</span> nodeY <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">&quot;y&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span><span class="token constant">FLOAT</span><span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span><span class="token constant">RLE</span><span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span><span class="token constant">SNAPPY</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">MeasurementNode</span> nodeSpeed <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">&quot;speed&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span><span class="token constant">DOUBLE</span><span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span><span class="token constant">GORILLA</span><span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span><span class="token constant">SNAPPY</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// This is the template we suggest to implement</span>
<span class="token class-name">Template</span> flatTemplate <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Template</span><span class="token punctuation">(</span><span class="token string">&quot;flatTemplate&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeX<span class="token punctuation">)</span><span class="token punctuation">;</span>
template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeY<span class="token punctuation">)</span><span class="token punctuation">;</span>
template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeSpeed<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">createSchemaTemplate</span><span class="token punctuation">(</span>flatTemplate<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>在创建概念元数据模板以后，还可以通过以下接口增加或删除模板内的物理量。请注意，已经挂载的模板不能删除内部的物理量。</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token comment">// 为指定模板新增一组对齐的物理量，若其父节点在模板中已经存在，且不要求对齐，则报错</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addAlignedMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span>
    						  <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> measurementsPath<span class="token punctuation">,</span>
                              <span class="token class-name">TSDataType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> dataTypes<span class="token punctuation">,</span>
                              <span class="token class-name">TSEncoding</span><span class="token punctuation">[</span><span class="token punctuation">]</span> encodings<span class="token punctuation">,</span>
                              <span class="token class-name">CompressionType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> compressors<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 为指定模板新增一个对齐物理量, 若其父节点在模板中已经存在，且不要求对齐，则报错</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addAlignedMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span>
                                <span class="token class-name">String</span> measurementPath<span class="token punctuation">,</span>
                                <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span>
                                <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span>
                                <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span>


<span class="token comment">// 为指定模板新增一个不对齐物理量, 若其父节在模板中已经存在，且要求对齐，则报错</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addUnalignedMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span>
                                <span class="token class-name">String</span> measurementPath<span class="token punctuation">,</span>
                                <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span>
                                <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span>
                                <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span>
                                
<span class="token comment">// 为指定模板新增一组不对齐的物理量, 若其父节在模板中已经存在，且要求对齐，则报错</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addUnalignedMeasurementsIntemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span>
                                <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> measurementPaths<span class="token punctuation">,</span>
                                <span class="token class-name">TSDataType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> dataTypes<span class="token punctuation">,</span>
                                <span class="token class-name">TSEncoding</span><span class="token punctuation">[</span><span class="token punctuation">]</span> encodings<span class="token punctuation">,</span>
                                <span class="token class-name">CompressionType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> compressors<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 从指定模板中删除一个节点</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteNodeInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>对于已经创建的元数据模板，还可以通过以下接口查询模板信息：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token comment">// 查询返回目前模板中所有物理量的数量</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">countMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 检查模板内指定路径是否为物理量</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 检查在指定模板内是否存在某路径</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isPathExistInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 返回指定模板内所有物理量的路径</span>
<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">showMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 返回指定模板内某前缀路径下的所有物理量的路径</span>
<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">showMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> pattern<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>将名为<code>templateName</code>的元数据模板挂载到&#39;prefixPath&#39;路径下，在执行这一步之前，你需要创建名为<code>templateName</code>的元数据模板</li><li><strong>请注意，我们强烈建议您将模板设置在存储组或存储组下层的节点中，以更好地适配未来版本更新及各模块的协作</strong></li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">setSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>将模板挂载到 MTree 上之后，你可以随时查询所有模板的名称、某模板被设置到 MTree 的所有路径、所有正在使用某模板的所有路径，即如下接口：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token doc-comment comment">/** <span class="token keyword">@return</span> All template names. */</span>
<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">showAllTemplates</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token doc-comment comment">/** <span class="token keyword">@return</span> All paths have been set to designated template. */</span>
<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">showPathsTemplateSetOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token doc-comment comment">/** <span class="token keyword">@return</span> All paths are using designated template. */</span>
<span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">showPathsTemplateUsingOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>如果你需要删除某一个模板，请确保在进行删除之前，MTree 上已经没有节点被挂载了模板，对于已经被挂载模板的节点，可以用如下接口卸载模板；</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">unsetSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> prefixPath<span class="token punctuation">,</span> <span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">dropSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>请注意，如果一个子树中有多个孩子节点需要使用模板，可以在其共同父母节点上使用 <code>setSchemaTemplate</code> 。而只有在已有数据点插入模板对应的物理量，或使用以下接口激活模板，模板才会被设置为激活状态，进而被 <code>show timeseries</code> 等查询访问到。</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">createTimeseriesOfTemplateOnPath</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>卸载&#39;prefixPath&#39;路径下的名为<code>templateName</code>的元数据模板。你需要保证给定的路径<code>prefixPath</code>下需要有名为<code>templateName</code>的元数据模板。</li><li>如果在挂载模板后，曾经在<code>prefixPath</code>路径及其后代节点使用模板插入数据后，或者使用了激活模板命令，那么在卸载模板之前，还要对所有已激活模板的节点使用以下接口解除模板：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deactivateTemplateOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>以上解除模板接口中，参数<code>prefixPath</code>如果含有通配符（<code>*</code>或<code>**</code>）则按 PathPattern 匹配目标路径，否则仅表达其字面量对应的路径。</li><li>解除模板接口会删除对应节点按照模板中的序列写入的数据。</li></ul><h4 id="数据操作接口-dml" tabindex="-1"><a class="header-anchor" href="#数据操作接口-dml"><span>数据操作接口 DML</span></a></h4><h5 id="数据写入" tabindex="-1"><a class="header-anchor" href="#数据写入"><span>数据写入</span></a></h5><p>推荐使用 insertTablet 帮助提高写入效率</p><ul><li>插入一个 Tablet，Tablet 是一个设备若干行数据块，每一行的列都相同 <ul><li><strong>写入效率高</strong></li><li><strong>支持批量写入</strong></li><li><strong>支持写入空值</strong>：空值处可以填入任意值，然后通过 BitMap 标记空值</li></ul></li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertTablet</span><span class="token punctuation">(</span><span class="token class-name">Tablet</span> tablet<span class="token punctuation">)</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Tablet</span> <span class="token punctuation">{</span>
  <span class="token doc-comment comment">/** deviceId of this tablet */</span>
  <span class="token keyword">public</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** the list of measurement schemas for creating the tablet */</span>
  <span class="token keyword">private</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">&gt;</span></span> schemas<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** timestamps in this tablet */</span>
  <span class="token keyword">public</span> <span class="token keyword">long</span><span class="token punctuation">[</span><span class="token punctuation">]</span> timestamps<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** each object is a primitive type array, which represents values of one measurement */</span>
  <span class="token keyword">public</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> values<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** each bitmap represents the existence of each value in the current column. */</span>
  <span class="token keyword">public</span> <span class="token class-name">BitMap</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bitMaps<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** the number of rows to include in this tablet */</span>
  <span class="token keyword">public</span> <span class="token keyword">int</span> rowSize<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** the maximum number of rows for this tablet */</span>
  <span class="token keyword">private</span> <span class="token keyword">int</span> maxRowNumber<span class="token punctuation">;</span>
  <span class="token doc-comment comment">/** whether this tablet store data of aligned timeseries or not */</span>
  <span class="token keyword">private</span> <span class="token keyword">boolean</span> isAligned<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="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>插入多个 Tablet</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertTablets</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Tablet</span><span class="token punctuation">&gt;</span></span> tablets<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li><p>插入一个 Record，一个 Record 是一个设备一个时间戳下多个测点的数据。这里的 value 是 Object 类型，相当于提供了一个公用接口，后面可以通过 TSDataType 将 value 强转为原类型</p><p>其中，Object 类型与 TSDataType 类型的对应关系如下表所示：</p><table><thead><tr><th>TSDataType</th><th>Object</th></tr></thead><tbody><tr><td>BOOLEAN</td><td>Boolean</td></tr><tr><td>INT32</td><td>Integer</td></tr><tr><td>INT64</td><td>Long</td></tr><tr><td>FLOAT</td><td>Float</td></tr><tr><td>DOUBLE</td><td>Double</td></tr><tr><td>TEXT</td><td>String, Binary</td></tr></tbody></table></li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> prefixPath<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurements<span class="token punctuation">,</span>
   <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span></span> types<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> values<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>插入多个 Record</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> deviceIds<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> typesList<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="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>插入同属于一个 device 的多个 Record</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecordsOfOneDevice</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> typesList<span class="token punctuation">,</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h5 id="带有类型推断的写入" tabindex="-1"><a class="header-anchor" href="#带有类型推断的写入"><span>带有类型推断的写入</span></a></h5><p>当数据均是 String 类型时，我们可以使用如下接口，根据 value 的值进行类型推断。例如：value 为 &quot;true&quot; ，就可以自动推断为布尔类型。value 为 &quot;3.2&quot; ，就可以自动推断为数值类型。服务器需要做类型推断，可能会有额外耗时，速度较无需类型推断的写入慢</p><ul><li>插入一个 Record，一个 Record 是一个设备一个时间戳下多个测点的数据</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> prefixPath<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurements<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> values<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>插入多个 Record</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
   <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>插入同属于一个 device 的多个 Record</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertStringRecordsOfOneDevice</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h5 id="对齐时间序列的写入" tabindex="-1"><a class="header-anchor" href="#对齐时间序列的写入"><span>对齐时间序列的写入</span></a></h5><p>对齐时间序列的写入使用 insertAlignedXXX 接口，其余与上述接口类似：</p><ul><li>insertAlignedRecord</li><li>insertAlignedRecords</li><li>insertAlignedRecordsOfOneDevice</li><li>insertAlignedStringRecordsOfOneDevice</li><li>insertAlignedTablet</li><li>insertAlignedTablets</li></ul><h5 id="数据删除" tabindex="-1"><a class="header-anchor" href="#数据删除"><span>数据删除</span></a></h5><ul><li>删除一个或多个时间序列在某个时间点前或这个时间点的数据</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteData</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">,</span> <span class="token keyword">long</span> endTime<span class="token punctuation">)</span>
<span class="token keyword">void</span> <span class="token function">deleteData</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> endTime<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h5 id="数据查询" tabindex="-1"><a class="header-anchor" href="#数据查询"><span>数据查询</span></a></h5><ul><li>原始数据查询。时间间隔包含开始时间，不包含结束时间</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeRawDataQuery</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> startTime<span class="token punctuation">,</span> <span class="token keyword">long</span> endTime<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>查询最后一条时间戳大于等于某个时间点的数据</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeLastDataQuery</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> <span class="token class-name">LastTime</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="iotdb-sql-接口" tabindex="-1"><a class="header-anchor" href="#iotdb-sql-接口"><span>IoTDB-SQL 接口</span></a></h4><ul><li>执行查询语句</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>执行非查询语句</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">executeNonQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h4 id="写入测试接口-用于分析网络带宽" tabindex="-1"><a class="header-anchor" href="#写入测试接口-用于分析网络带宽"><span>写入测试接口 (用于分析网络带宽)</span></a></h4><p>不实际写入数据，只将数据传输到 server 即返回</p><ul><li>测试 insertRecord</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurements<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> values<span class="token punctuation">)</span>

<span class="token keyword">void</span> <span class="token function">testInsertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurements<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span></span> types<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> values<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>测试 testInsertRecords</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>

<span class="token keyword">void</span> <span class="token function">testInsertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> typesList<span class="token punctuation">,</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="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>测试 insertTablet</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertTablet</span><span class="token punctuation">(</span><span class="token class-name">Tablet</span> tablet<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>测试 insertTablets</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertTablets</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Tablet</span><span class="token punctuation">&gt;</span></span> tablets<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h5 id="示例代码" tabindex="-1"><a class="header-anchor" href="#示例代码"><span>示例代码</span></a></h5><p>浏览上述接口的详细信息，请参阅代码 <code>session/src/main/java/org/apache/iotdb/session/Session.java</code></p><p>使用上述接口的示例代码在 <code>example/session/src/main/java/org/apache/iotdb/SessionExample.java</code></p><p>使用对齐时间序列和元数据模板的示例可以参见 <code>example/session/src/main/java/org/apache/iotdb/AlignedTimeseriesSessionExample.java</code></p><h6 id="针对原生接口的连接池" tabindex="-1"><a class="header-anchor" href="#针对原生接口的连接池"><span>针对原生接口的连接池</span></a></h6><p>我们提供了一个针对原生接口的连接池 (<code>SessionPool</code>)，使用该接口时，你只需要指定连接池的大小，就可以在使用时从池中获取连接。<br> 如果超过 60s 都没得到一个连接的话，那么会打印一条警告日志，但是程序仍将继续等待。</p><p>当一个连接被用完后，他会自动返回池中等待下次被使用；<br> 当一个连接损坏后，他会从池中被删除，并重建一个连接重新执行用户的操作；<br> 你还可以像创建 Session 那样在创建 SessionPool 时指定多个可连接节点的 url，以保证分布式集群中客户端的高可用性。</p><p>对于查询操作：</p><ol><li>使用 SessionPool 进行查询时，得到的结果集是<code>SessionDataSet</code>的封装类<code>SessionDataSetWrapper</code>;</li><li>若对于一个查询的结果集，用户并没有遍历完且不再想继续遍历时，需要手动调用释放连接的操作<code>closeResultSet</code>;</li><li>若对一个查询的结果集遍历时出现异常，也需要手动调用释放连接的操作<code>closeResultSet</code>.</li><li>可以调用 <code>SessionDataSetWrapper</code> 的 <code>getColumnNames()</code> 方法得到结果集列名</li></ol><p>使用示例可以参见 <code>session/src/test/java/org/apache/iotdb/session/pool/SessionPoolTest.java</code></p><p>或 <code>example/session/src/main/java/org/apache/iotdb/SessionPoolExample.java</code></p><h6 id="集群信息相关的接口-仅在集群模式下可用" tabindex="-1"><a class="header-anchor" href="#集群信息相关的接口-仅在集群模式下可用"><span>集群信息相关的接口 （仅在集群模式下可用）</span></a></h6><p>集群信息相关的接口允许用户获取如数据分区情况、节点是否当机等信息。<br> 要使用该 API，需要增加依赖：</p><div class="language-xml line-numbers-mode" data-ext="xml" data-title="xml"><pre class="language-xml"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependencies</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">&gt;</span></span>org.apache.iotdb<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">&gt;</span></span>iotdb-thrift-cluster<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">&gt;</span></span>0.13.0-SNAPSHOT<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependencies</span><span class="token punctuation">&gt;</span></span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>建立连接与关闭连接的示例：</p><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>protocol<span class="token punctuation">.</span></span><span class="token class-name">TBinaryProtocol</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TSocket</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TTransport</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TTransportException</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>rpc<span class="token punctuation">.</span></span><span class="token class-name">RpcTransportFactory</span></span><span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">CluserInfoClient</span> <span class="token punctuation">{</span>
  <span class="token class-name">TTransport</span> transport<span class="token punctuation">;</span>
  <span class="token class-name">ClusterInfoService<span class="token punctuation">.</span>Client</span> client<span class="token punctuation">;</span>
  <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">connect</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    transport <span class="token operator">=</span>
      <span class="token class-name">RpcTransportFactory</span><span class="token punctuation">.</span><span class="token constant">INSTANCE</span><span class="token punctuation">.</span><span class="token function">getTransport</span><span class="token punctuation">(</span>
        <span class="token keyword">new</span> <span class="token class-name">TSocket</span><span class="token punctuation">(</span>
          <span class="token comment">// the RPC address</span>
          <span class="token class-name">IoTDBDescriptor</span><span class="token punctuation">.</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getRpcAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token comment">// the RPC port</span>
          <span class="token class-name">ClusterDescriptor</span><span class="token punctuation">.</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getClusterRpcPort</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
      transport<span class="token punctuation">.</span><span class="token keyword">open</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">TTransportException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token class-name">Assert</span><span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token comment">//get the client</span>
    client <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ClusterInfoService<span class="token punctuation">.</span>Client</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">TBinaryProtocol</span><span class="token punctuation">(</span>transport<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
  <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    transport<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>  
<span class="token punctuation">}</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>API 列表：</p><ul><li>获取集群中的各个节点的信息（构成哈希环）</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code>list<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Node</span><span class="token punctuation">&gt;</span></span> <span class="token function">getRing</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>给定一个路径（应包括一个 SG 作为前缀）和起止时间，获取其覆盖的数据分区情况：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token doc-comment comment">/**
 * <span class="token keyword">@param</span> <span class="token parameter">path</span> input path (should contains a Storage group name as its prefix)
 * <span class="token keyword">@return</span> the data partition info. If the time range only covers one data partition, the the size
 * of the list is one.
 */</span>
list<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">DataPartitionEntry</span><span class="token punctuation">&gt;</span></span> <span class="token function">getDataPartition</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token operator">:</span>string path<span class="token punctuation">,</span> <span class="token number">2</span><span class="token operator">:</span><span class="token keyword">long</span> startTime<span class="token punctuation">,</span> <span class="token number">3</span><span class="token operator">:</span><span class="token keyword">long</span> endTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="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>给定一个路径（应包括一个 SG 作为前缀），获取其被分到了哪个节点上：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token doc-comment comment">/**
 * <span class="token keyword">@param</span> <span class="token parameter">path</span> input path (should contains a Storage group name as its prefix)
 * <span class="token keyword">@return</span> metadata partition information
 */</span>
list<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Node</span><span class="token punctuation">&gt;</span></span> <span class="token function">getMetaPartition</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token operator">:</span>string path<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="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>获取所有节点的死活状态：</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token doc-comment comment">/**
 * <span class="token keyword">@return</span> key: node, value: live or not
 */</span>
map<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Node</span><span class="token punctuation">,</span> bool<span class="token punctuation">&gt;</span></span> <span class="token function">getAllNodeStatus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>获取当前连接节点的 Raft 组信息（投票编号等）（一般用户无需使用该接口）:</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token doc-comment comment">/**
 * <span class="token keyword">@return</span> A multi-line string with each line representing the total time consumption, invocation
 *     number, and average time consumption.
 */</span>
string <span class="token function">getInstrumentingInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="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>`,123);function m(v,g){const e=p("RouteLink");return c(),l("div",null,[d,n("ul",null,[n("li",null,[s("对于 IoTDB-SQL 接口：传入的 SQL 参数需要符合 "),o(e,{to:"/zh/UserGuide/V0.13.x/Reference/Syntax-Conventions.html"},{default:i(()=>[s("语法规范")]),_:1}),s(" ，并且针对 JAVA 字符串进行反转义，如双引号前需要加反斜杠。（即：经 JAVA 转义之后与命令行执行的 SQL 语句一致。）")]),k]),r])}const h=t(u,[["render",m],["__file","Programming-Java-Native-API.html.vue"]]),S=JSON.parse('{"path":"/zh/UserGuide/V0.13.x/API/Programming-Java-Native-API.html","title":"应用编程接口","lang":"zh-CN","frontmatter":{"description":"应用编程接口 Java 原生接口 安装 依赖 JDK >= 1.8 Maven >= 3.6 安装方法 在根目录下运行： 在 MAVEN 中使用原生接口 语法说明 对于 IoTDB-SQL 接口：传入的 SQL 参数需要符合 ，并且针对 JAVA 字符串进行反转义，如双引号前需要加反斜杠。（即：经 JAVA 转义之后与命令行执行的 SQL 语句一致。）...","head":[["link",{"rel":"alternate","hreflang":"en-us","href":"https://iotdb.apache.org/UserGuide/V0.13.x/API/Programming-Java-Native-API.html"}],["meta",{"property":"og:url","content":"https://iotdb.apache.org/zh/UserGuide/V0.13.x/API/Programming-Java-Native-API.html"}],["meta",{"property":"og:site_name","content":"IoTDB Website"}],["meta",{"property":"og:title","content":"应用编程接口"}],["meta",{"property":"og:description","content":"应用编程接口 Java 原生接口 安装 依赖 JDK >= 1.8 Maven >= 3.6 安装方法 在根目录下运行： 在 MAVEN 中使用原生接口 语法说明 对于 IoTDB-SQL 接口：传入的 SQL 参数需要符合 ，并且针对 JAVA 字符串进行反转义，如双引号前需要加反斜杠。（即：经 JAVA 转义之后与命令行执行的 SQL 语句一致。）..."}],["meta",{"property":"og:type","content":"article"}],["meta",{"property":"og:locale","content":"zh-CN"}],["meta",{"property":"og:locale:alternate","content":"en-US"}],["meta",{"property":"og:updated_time","content":"2023-07-31T08:42:16.000Z"}],["meta",{"property":"article:modified_time","content":"2023-07-31T08:42:16.000Z"}],["script",{"type":"application/ld+json"},"{\\"@context\\":\\"https://schema.org\\",\\"@type\\":\\"Article\\",\\"headline\\":\\"应用编程接口\\",\\"image\\":[\\"\\"],\\"dateModified\\":\\"2023-07-31T08:42:16.000Z\\",\\"author\\":[]}"]]},"headers":[{"level":2,"title":"Java 原生接口","slug":"java-原生接口","link":"#java-原生接口","children":[{"level":3,"title":"安装","slug":"安装","link":"#安装","children":[]},{"level":3,"title":"依赖","slug":"依赖","link":"#依赖","children":[]},{"level":3,"title":"安装方法","slug":"安装方法","link":"#安装方法","children":[]},{"level":3,"title":"在 MAVEN 中使用原生接口","slug":"在-maven-中使用原生接口","link":"#在-maven-中使用原生接口","children":[]},{"level":3,"title":"语法说明","slug":"语法说明","link":"#语法说明","children":[]},{"level":3,"title":"基本接口说明","slug":"基本接口说明","link":"#基本接口说明","children":[]}]}],"git":{"createdTime":1688958677000,"updatedTime":1690792936000,"contributors":[{"name":"CritasWang","email":"critas@outlook.com","commits":1},{"name":"Summer","email":"43237967+2b3c511@users.noreply.github.com","commits":1}]},"readingTime":{"minutes":12.17,"words":3651},"filePathRelative":"zh/UserGuide/V0.13.x/API/Programming-Java-Native-API.md","localizedDate":"2023年7月10日","autoDesc":true}');export{h as comp,S as data};