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     <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-开始使用</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-基本概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-系统部署与管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-IoTDB SQL文档</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>7-TsFile</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/1-Installation.html" class="sidebar-link">安装</a></li><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/2-Usage.html" aria-current="page" class="active sidebar-link">用法</a></li><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/3-Hierarchy.html" class="sidebar-link">TsFile层次结构</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-系统工具</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="用法"><a href="#用法" class="header-anchor">#</a> 用法</h1> <p>现在，您准备开始使用TsFile做一些很棒的事情。 本节演示TsFile的详细用法。</p> <h2 id="时间序列数据"><a href="#时间序列数据" class="header-anchor">#</a> 时间序列数据</h2> <p>时间序列被视为四倍序列。 四元组定义为（设备，测量，时间，值）。</p> <ul><li><p><strong>测量</strong>: 时间序列进行的物理或形式测量，例如城市温度，某些商品的销售数量或火车在不同时间的速度。 由于传统的传感器（例如温度计）也需要进行一次测量并生成一个时间序列，因此我们将在下面互换使用测量和传感器。</p></li> <li><p><strong>设备</strong>: 设备是指正在执行多个测量（产生多个时间序列）的实体，例如，运行中的火车监视其速度，油表，行驶里程，当前乘客均被传送到一个时间序列。</p></li></ul> <p>表1说明了一组时间序列数据。 下表中显示的集合包含一个名为“ device_1”的设备以及三个名为“ sensor_1”，“ sensor_2”和“ sensor_3”的测量值。</p> <center><table style="text-align:center;"><tr><th colspan="6">device_1</th></tr> <tr><th colspan="2">sensor_1</th><th colspan="2">sensor_2</th><th colspan="2">sensor_3</th></tr> <tr><th>time</th><th>value</th><th>time</th><th>value</th><th>time</th><th>value</th></tr> <tr><td>1</td><td>1.2</td><td>1</td><td>20</td><td>2</td><td>50</td></tr> <tr><td>3</td><td>1.4</td><td>2</td><td>20</td><td>4</td><td>51</td></tr> <tr><td>5</td><td>1.1</td><td>3</td><td>21</td><td>6</td><td>52</td></tr> <tr><td>7</td><td>1.8</td><td>4</td><td>20</td><td>8</td><td>53</td></tr></table> <span>一组时间序列数据</span></center> <p><strong>一行数据</strong>: 在许多工业应用中，设备通常包含多个传感器，并且这些传感器可能在同一时间戳上具有值，这称为一行数据。</p> <p>形式上，一行数据由一个<code>device_id</code>，一个指示自1970年1月1日以来的毫秒数，00：00：00组成的时间戳，以及由<code>measurement_id</code>和对应的<code>value</code>组成的几对数据组成。 一行中的所有数据对都属于该<code>device_id</code>，并且具有相同的时间戳。 如果其中一个<code>measurements</code> 在<code>value</code> 中没有<code>value</code>，请改用空格（实际上，TsFile不存储空值）。 其格式如下所示：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>device_id, timestamp, &lt;measurement_id, value&gt;...
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>一个示例如下所示。 在此示例中，两个测量的数据类型分别为INT32和FLOAT。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>device_1, 1490860659000, m1, 10, m2, 12.12
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="编写tsfile"><a href="#编写tsfile" class="header-anchor">#</a> 编写TsFile</h2> <h3 id="生成一个tsfile文件。"><a href="#生成一个tsfile文件。" class="header-anchor">#</a> 生成一个TsFile文件。</h3> <p>可以通过以下三个步骤来生成TsFile，完整的代码将在“编写TsFile的示例”部分中给出。</p> <ul><li><p>首先，构造一个<code>TsFileWriter</code>实例。</p> <p>以下是可用的构造函数：</p> <ul><li>没有预定义的架构</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(File file) throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>使用预定义的架构</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(File file, FileSchema schema) throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这是用于使用HDFS文件系统的。  <code>TsFileOutput</code>可以是<code>HDFSOutput</code>类的实例。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(TsFileOutput output, FileSchema schema) throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><strong>参量:</strong></p> <ul><li><p>文件: 要写的TsFile</p></li> <li><p>模式: 文件模式将在下一部分中介绍。</p></li></ul></li> <li><p>二，添加测量</p> <p>或者，您可以先创建<code>FileSchema</code>类的实例，然后将其传递给<code>TsFileWriter</code>类的构造函数。</p> <p><code>FileSchema</code>类包含一个映射，该映射的键是一个测量模式的名称，而值是该模式本身。</p> <p>这里是接口：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>// 创建一个空的FileSchema或从现有的映射
 public FileSchema()
 public FileSchema(Map&lt;String, MeasurementSchema&gt; measurements)

 // 使用这两个界面添加测量
 public void registerMeasurement(MeasurementSchema descriptor)
 public void registerMeasurements(Map&lt;String, MeasurementSchema&gt; measurements)

 // 一些有用的吸气剂和检查剂
 public TSDataType getMeasurementDataType(String measurementId)
 public MeasurementSchema getMeasurementSchema(String measurementId)
 public Map&lt;String, MeasurementSchema&gt; getAllMeasurementSchema()
 public boolean hasMeasurement(String measurementId)
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p>您可以始终在<code>TsFileWriter</code>类中使用以下接口来添加其他度量：
 </p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void addMeasurement(MeasurementSchema measurementSchema) throws WriteProcessException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><code>MeasurementSchema</code>类包含一种度量的信息，有几种构造函数：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding)

 public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType)

 public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType,
 Map&lt;String, String&gt; props)
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p><strong>参数：</strong></p> <ul><li><p>measurementID：此测量的名称，通常是传感器的名称。</p></li> <li><p>类型：数据类型，现在支持六种类型：<code>BOOLEAN</code>，<code>INT32</code>，<code>INT64</code>，<code>FLOAT</code>，<code>DOUBLE</code>，<code>TEXT</code>。</p></li> <li><p>encoding：数据编码。 看到 <a href="/zh/UserGuide/V0.8.x/2-Concept Key Concepts and Terminology/3-Encoding.html">章节 2-3</a>.</p></li> <li><p>compression：数据压缩。 现在支持<code>UNCOMPRESSED</code>和<code>SNAPPY</code>。</p></li> <li><p>props：特殊数据类型的属性，例如<code>FLOAT</code>和<code>DOUBLE</code>的<code>max_point_number</code>，<code>TEXT</code>的<code>max_string_length</code>。 用作字符串对，例如（“ max_point_number”，“ 3”）。</p></li></ul> <blockquote><p>**注意：**尽管一个度量名称可以在多个deltaObject中使用，但是不能更改属性。 即    不允许多次使用不同的类型或编码添加一个测量名称。
 这是一个不好的例子：</p></blockquote> <div class="language- extra-class"><pre><code>  // 测量值“ sensor_1”为浮点型
   addMeasurement(new MeasurementSchema(&quot;sensor_1&quot;, TSDataType.FLOAT, TSEncoding.RLE));

   // 此调用将引发WriteProcessException异常
   addMeasurement(new MeasurementSchema(&quot;sensor_1&quot;, TSDataType.INT32, TSEncoding.RLE));
 </code></pre></div></li> <li><p>第三，连续插入和写入数据。</p> <p>使用此接口可以创建新的<code>TSRecord</code>（时间戳和设备对）。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TSRecord(long timestamp, String deviceId)
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>然后创建一个<code>DataPoint</code>（一个测量值和一个值对），并使用<code>addTuple</code>方法将<code>DataPoint</code>添加到正确的TsRecord。</p> <p>用这种方法写</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void write(TSRecord record) throws IOException, WriteProcessException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>最后，调用<code>close</code>完成此编写过程。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public void close() throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li></ul> <h3 id="编写tsfile的示例"><a href="#编写tsfile的示例" class="header-anchor">#</a> 编写TsFile的示例</h3> <p>您应该将TsFile安装到本地Maven存储库。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean install -pl tsfile -am -DskipTests
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>可以在以下位置找到更详尽的示例<code>/tsfile/example/src/main/java/org/apache/iotdb/tsfile/TsFileWrite.java</code></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile</span><span class="token punctuation">;</span>

 <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io</span><span class="token punctuation">.</span><span class="token class-name">File</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums</span><span class="token punctuation">.</span><span class="token class-name">TSDataType</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>file<span class="token punctuation">.</span>metadata<span class="token punctuation">.</span>enums</span><span class="token punctuation">.</span><span class="token class-name">TSEncoding</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write</span><span class="token punctuation">.</span><span class="token class-name">TsFileWriter</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record</span><span class="token punctuation">.</span><span class="token class-name">TSRecord</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">DataPoint</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">FloatDataPoint</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>record<span class="token punctuation">.</span>datapoint</span><span class="token punctuation">.</span><span class="token class-name">IntDataPoint</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>write<span class="token punctuation">.</span>schema</span><span class="token punctuation">.</span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">;</span>
 <span class="token comment">/**
  * 将数据写入TsFile的示例
  * 它使用以下接口：
  * 公共无效addMeasurement（MeasurementSchema MeasurementSchema）抛出WriteProcessException
  */</span>
 <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileWrite</span> <span class="token punctuation">{</span>

   <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span> args<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>
       <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">&quot;test.tsfile&quot;</span><span class="token punctuation">;</span>
       <span class="token class-name">File</span> f <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token keyword">if</span> <span class="token punctuation">(</span>f<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         f<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token punctuation">}</span>
       <span class="token class-name">TsFileWriter</span> tsFileWriter <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileWriter</span><span class="token punctuation">(</span>f<span class="token punctuation">)</span><span class="token punctuation">;</span>

       <span class="token comment">// 将度量添加到文件模式</span>
       tsFileWriter
           <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_1&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       tsFileWriter
           <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_2&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       tsFileWriter
           <span class="token punctuation">.</span><span class="token function">addMeasurement</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">MeasurementSchema</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_3&quot;</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

       <span class="token comment">// 构造TSRecord</span>
       <span class="token class-name">TSRecord</span> tsRecord <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TSRecord</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">&quot;device_1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token class-name">DataPoint</span> dPoint1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_1&quot;</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token class-name">DataPoint</span> dPoint2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_2&quot;</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token class-name">DataPoint</span> dPoint3 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LongDataPoint</span><span class="token punctuation">(</span><span class="token string">&quot;sensor_3&quot;</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint1<span class="token punctuation">)</span><span class="token punctuation">;</span>
       tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint2<span class="token punctuation">)</span><span class="token punctuation">;</span>
       tsRecord<span class="token punctuation">.</span><span class="token function">addTuple</span><span class="token punctuation">(</span>dPoint3<span class="token punctuation">)</span><span class="token punctuation">;</span>

       <span class="token comment">// 写TSRecord</span>
       tsFileWriter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>tsRecord<span class="token punctuation">)</span><span class="token punctuation">;</span>

       <span class="token comment">// 关闭TsFile</span>
       tsFileWriter<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
       e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token punctuation">}</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span>

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br></div></div><h2 id="读取tsfile的接口"><a href="#读取tsfile的接口" class="header-anchor">#</a> 读取TsFile的接口</h2> <h3 id="开始之前"><a href="#开始之前" class="header-anchor">#</a> 开始之前</h3> <p>“时间序列数据”部分中的时间序列数据集在此用于本节的具体介绍。 下表中显示的集合包含一个名为“ device \ _1”的deltaObject和三个名为“ sensor \ _1”，“ sensor \ _2”和“ sensor \ _3”的测量值。 并简化了测量以进行简单说明，每个仅包含4个时间值对。</p> <table><thead><tr><th style="text-align:center;">关系</th> <th style="text-align:center;">描述</th></tr></thead> <tbody><tr><td style="text-align:center;">TimeFilter.eq(value)</td> <td style="text-align:center;">选择等于值的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.lt(value)</td> <td style="text-align:center;">选择小于时间的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.gt(value)</td> <td style="text-align:center;">选择大于值的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.ltEq(value)</td> <td style="text-align:center;">选择小于或等于该值的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.gtEq(value)</td> <td style="text-align:center;">选择大于或等于该值的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.notEq(value)</td> <td style="text-align:center;">选择不等于该值的时间</td></tr> <tr><td style="text-align:center;">TimeFilter.not(TimeFilter)</td> <td style="text-align:center;">选择不满足另一个TimeFilter的时间</td></tr></tbody></table> <h3 id="路径定义"><a href="#路径定义" class="header-anchor">#</a> 路径定义</h3> <p>路径是用点分隔的字符串，该字符串在TsFile中唯一标识时间序列，例如“ root.area_1.device_1.sensor_1”。
 最后一部分“ sensor_1”称为“ measurementId”，其余部分“ root.area_1.device_1”称为deviceId。
 如上所述，不同设备中的相同测量具有相同的数据类型和编码，并且设备也是唯一的。</p> <p>在读取接口中，参数<code>paths</code>指示要选择的测量。</p> <p>路径实例可以通过<code>Path</code>类很容易地构造。 例如：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Path p = new Path(&quot;device_1.sensor_1&quot;);
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们将传递路径的ArrayList进行最终查询，以支持多个路径。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>List&lt;Path&gt; paths = new ArrayList&lt;Path&gt;();
 paths.add(new Path(&quot;device_1.sensor_1&quot;));
 paths.add(new Path(&quot;device_1.sensor_3&quot;));
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><blockquote><p>**注意：**在构造路径时，参数的格式应为点分隔的字符串，最后一部分将被识别为MeasurementId，而其余部分将被识别为deviceId。</p></blockquote> <h3 id="过滤器的定义"><a href="#过滤器的定义" class="header-anchor">#</a> 过滤器的定义</h3> <h4 id="使用场景"><a href="#使用场景" class="header-anchor">#</a> 使用场景</h4> <p>在TsFile读取过程中使用筛选器来选择满足一个或多个给定条件的数据。</p> <h4 id="iexpression"><a href="#iexpression" class="header-anchor">#</a> IExpression</h4> <p><code>IExpression</code>是一个过滤器表达式接口，它将传递给我们的最终查询调用。
 我们创建一个或多个过滤器表达式，并可以使用二进制过滤器运算符将它们链接到最终表达式。</p> <ul><li><p><strong>创建一个过滤器表达式</strong></p> <p>有两种类型的过滤器。</p> <ul><li>时间过滤器: 时间序列数据中时间的过滤器。<div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter);
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code> 	使用以下关系获取`TimeFilter`对象（值是一个long int变量）。

 |            关系            |               描述               |
 | :------------------------: | :------------------------------: |
 |    TimeFilter.eq(value)    |         选择等于值的时间         |
 |    TimeFilter.lt(value)    |        选择小于时间的时间        |
 |    TimeFilter.gt(value)    |         选择大于值的时间         |
 |   TimeFilter.ltEq(value)   |     选择小于或等于该值的时间     |
 |   TimeFilter.gtEq(value)   |     选择大于或等于该值的时间     |
 |  TimeFilter.notEq(value)   |       选择不等于该值的时间       |
 | TimeFilter.not(TimeFilter) | 选择不满足另一个TimeFilter的时间 |

 * ValueFilter：时间序列数据中`value`的过滤器。

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p>IExpression valueFilterExpr = new SingleSeriesExpression(Path, ValueFilter);</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>	`ValueFilter`的用法与使用`TimeFilter`的用法相同，只是要确保值的类型等于测量值（在路径中定义）。

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p><strong>二元滤波器运算符</strong></p> <p>二进制过滤器运算符可用于链接两个单个表达式。</p> <ul><li>BinaryExpression.and（Expression，Expression）：选择两个表达式都满足的值。</li> <li>BinaryExpression.or（Expression，Expression）：选择至少满足一个表达式的值。</li></ul></li></ul> <h4 id="过滤器表达式示例"><a href="#过滤器表达式示例" class="header-anchor">#</a> 过滤器表达式示例</h4> <ul><li><p><strong>TimeFilterExpression示例</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.eq(15)); // series time = 15

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.ltEq(15)); // series time &lt;= 15

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.lt(15)); // series time &lt; 15

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.gtEq(15)); // series time &gt;= 15

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter.notEq(15)); // series time != 15

 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = BinaryExpression.and(new GlobalTimeExpression(TimeFilter.gtEq(15L)),
                                          new GlobalTimeExpression(TimeFilter.lt(25L))); // 15 &lt;= series time &lt; 25
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression timeFilterExpr = BinaryExpression.or(new GlobalTimeExpression(TimeFilter.gtEq(15L)),
                                          new GlobalTimeExpression(TimeFilter.lt(25L))); // series time &gt;= 15 or series time &lt; 25
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li></ul> <h3 id="读取界面"><a href="#读取界面" class="header-anchor">#</a> 读取界面</h3> <p>首先，我们打开TsFile并从文件路径字符串<code>path</code>获取一个<code>ReadOnlyTsFile</code>实例。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TsFileSequenceReader reader = new TsFileSequenceReader(path);

 ReadOnlyTsFile readTsFile = new ReadOnlyTsFile(reader);
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>接下来，我们准备路径数组和查询表达式，然后通过此接口获取最终的<code>QueryExpression</code>对象：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>QueryExpression queryExpression = QueryExpression.create(paths, statement);
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>ReadOnlyTsFile类具有两个<code>query</code>方法来执行查询。</p> <ul><li><p><strong>方法1</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public QueryDataSet query(QueryExpression queryExpression) throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p><strong>方法二</strong></p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public QueryDataSet query(QueryExpression queryExpression, long partitionStartOffset, long partitionEndOffset) throws IOException
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>此方法设计用于高级应用程序，例如TsFile-Spark连接器。</p> <ul><li><p><strong>参数</strong>: 对于方法2，添加了两个附加参数以支持部分查询：</p> <ul><li><code>partitionStartOffset</code>:TsFile的起始偏移量</li> <li><code>partitionEndOffset</code>: TsFile的结束偏移量</li></ul> <blockquote><p>**什么是部分查询？**在某些分布式文件系统（例如HDFS）中，文件被分成几个部分，这些部分称为“块”，并存储在不同的节点中。 在涉及的每个节点中并行执行查询可以提高效率。 因此，需要部分查询。  Paritial Query只选择存储在零件中的结果，该零件由TsFile的<code>QueryConstant.PARTITION_START_OFFSET</code>和<code>QueryConstant.PARTITION_END_OFFSET</code>分开。</p></blockquote></li></ul></li></ul> <h3 id="querydataset接口"><a href="#querydataset接口" class="header-anchor">#</a> QueryDataset接口</h3> <p>上面执行的查询将返回一个<code>QueryDataset</code>对象。</p> <p>这是对用户有用的界面。</p> <ul><li><p><code>bool hasNext();</code></p> <p>如果此数据集仍包含元素，则返回true。</p></li> <li><p><code>List&lt;Path&gt; getPaths()</code></p> <p>获取此数据集中的路径。</p></li> <li><p><code>List&lt;TSDataType&gt; getDataTypes();</code></p> <p>获取数据类型。  <code>TSDataType</code>类是一个枚举类，值将是以下值之一：</p> <div class="language- extra-class"><pre><code> BOOLEAN,
  INT32,
  INT64,
  FLOAT,
  DOUBLE,
  TEXT;
 </code></pre></div></li> <li><p><code>RowRecord next() throws IOException;</code></p> <p>获取下一条记录。</p> <p><code>RowRecord</code>类由一个<code>long</code>时间戳和一个<code>List &lt;Field&gt;</code>组成，用于不同传感器中的数据，我们可以使用两种getter方法来获取它们。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>long getTimestamp();
 List&lt;Field&gt; getFields();
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>要从一个字段获取数据，请使用以下方法：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSDataType getDataType();
 Object getObjectValue();
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li></ul> <h3 id="读取现有tsfile的示例"><a href="#读取现有tsfile的示例" class="header-anchor">#</a> 读取现有TsFile的示例</h3> <p>您应该将TsFile安装到本地Maven存储库。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>mvn clean install -pl tsfile -am -DskipTests
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>有关查询语句的更详尽示例，请参见：
 <code>/tsfile/example/src/main/java/org/apache/iotdb/tsfile/TsFileRead.java</code></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io</span><span class="token punctuation">.</span><span class="token class-name">IOException</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util</span><span class="token punctuation">.</span><span class="token class-name">ArrayList</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read</span><span class="token punctuation">.</span><span class="token class-name">ReadOnlyTsFile</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read</span><span class="token punctuation">.</span><span class="token class-name">TsFileSequenceReader</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>common</span><span class="token punctuation">.</span><span class="token class-name">Path</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression</span><span class="token punctuation">.</span><span class="token class-name">IExpression</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression</span><span class="token punctuation">.</span><span class="token class-name">QueryExpression</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl</span><span class="token punctuation">.</span><span class="token class-name">BinaryExpression</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl</span><span class="token punctuation">.</span><span class="token class-name">GlobalTimeExpression</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>expression<span class="token punctuation">.</span>impl</span><span class="token punctuation">.</span><span class="token class-name">SingleSeriesExpression</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>filter</span><span class="token punctuation">.</span><span class="token class-name">TimeFilter</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>filter</span><span class="token punctuation">.</span><span class="token class-name">ValueFilter</span><span class="token punctuation">;</span>
 <span class="token keyword">import</span> <span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>tsfile<span class="token punctuation">.</span>read<span class="token punctuation">.</span>query<span class="token punctuation">.</span>dataset</span><span class="token punctuation">.</span><span class="token class-name">QueryDataSet</span><span class="token punctuation">;</span>

 <span class="token comment">/**
  * 该类将显示如何读取名为“ test.ts文件”的Ts文件文件。
  * TsFile文件“ test.tsfile”是从类TsFileWrite生成的。
  * 运行TsFileWrite首先生成test.tsfile
  */</span>
 <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TsFileRead</span> <span class="token punctuation">{</span>
   <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">queryAndPrint</span><span class="token punctuation">(</span><span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Path</span><span class="token punctuation">&gt;</span></span> paths<span class="token punctuation">,</span> <span class="token class-name">ReadOnlyTsFile</span> readTsFile<span class="token punctuation">,</span> <span class="token class-name">IExpression</span> statement<span class="token punctuation">)</span>
           <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
     <span class="token class-name">QueryExpression</span> queryExpression <span class="token operator">=</span> <span class="token class-name">QueryExpression</span><span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span>paths<span class="token punctuation">,</span> statement<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token class-name">QueryDataSet</span> queryDataSet <span class="token operator">=</span> readTsFile<span class="token punctuation">.</span><span class="token function">query</span><span class="token punctuation">(</span>queryExpression<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token keyword">while</span> <span class="token punctuation">(</span>queryDataSet<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
       <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>queryDataSet<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token punctuation">}</span>
     <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;------------&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>

     <span class="token comment">// 文件路径</span>
     <span class="token class-name">String</span> path <span class="token operator">=</span> <span class="token string">&quot;test.tsfile&quot;</span><span class="token punctuation">;</span>

     <span class="token comment">// 创建阅读器并获取readTsFile接口</span>
     <span class="token class-name">TsFileSequenceReader</span> reader <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TsFileSequenceReader</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token class-name">ReadOnlyTsFile</span> readTsFile <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReadOnlyTsFile</span><span class="token punctuation">(</span>reader<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 使用这些路径（所有传感器）进行所有查询</span>
     <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Path</span><span class="token punctuation">&gt;</span></span> paths <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">&quot;device_1.sensor_1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">&quot;device_1.sensor_2&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     paths<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Path</span><span class="token punctuation">(</span><span class="token string">&quot;device_1.sensor_3&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token comment">// 没有查询语句</span>
     <span class="token function">queryAndPrint</span><span class="token punctuation">(</span>paths<span class="token punctuation">,</span> readTsFile<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token comment">// 离开时关闭阅读器</span>
     reader<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-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br></div></div><h2 id="用户指定的配置文件路径"><a href="#用户指定的配置文件路径" class="header-anchor">#</a> 用户指定的配置文件路径</h2> <p>默认配置文件<code>tsfile-format.properties.template</code>位于<code>/ tsfile / src / main / resources</code>目录中。 如果要使用自己的路径，则可以：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>System.setProperty(TsFileConstant.TSFILE_CONF, &quot;your config file path&quot;);
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>然后调用：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig config = TSFileDescriptor.getInstance().getConfig();
 </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev">
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