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cd tsfile/
mvn clean package -Dmaven.test.skip=true
</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>命令执行完成之后,所有的 jar 包都可以从 <code>target/</code> 目录下找到。之后您可以在自己的工程中倒入 <code>target/tsfile-0.10.0-jar-with-dependencies.jar</code>.</p></li></ul></li> <li><p>使用 Maven 依赖:</p> <p>编译源码并且部署到您的本地仓库中需要 3 步:</p> <ul><li><p>下载源码</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>git clone https://github.com/apache/incubator-iotdb.git
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>编译源码和部署到本地仓库</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>cd tsfile/
mvn clean install -Dmaven.test.skip=true
</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>在您自己的工程中增加依赖:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> &lt;dependency&gt;
&lt;groupId&gt;org.apache.iotdb&lt;/groupId&gt;
&lt;artifactId&gt;tsfile&lt;/artifactId&gt;
&lt;version&gt;0.10.0&lt;/version&gt;
&lt;/dependency&gt;
</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></div></div></li></ul> <p>或者,您可以直接使用官方的 Maven 仓库:</p> <ul><li><p>首先,在<code>hxd\.m2\settings.xml</code>目录下的<code>settings.xml</code>文件中<code>&lt;profiles&gt;</code>
节中增加<code>&lt;profile&gt;</code>,内容如下:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> &lt;profile&gt;
&lt;id&gt;allow-snapshots&lt;/id&gt;
&lt;activation&gt;&lt;activeByDefault&gt;true&lt;/activeByDefault&gt;&lt;/activation&gt;
&lt;repositories&gt;
&lt;repository&gt;
&lt;id&gt;apache.snapshots&lt;/id&gt;
&lt;name&gt;Apache Development Snapshot Repository&lt;/name&gt;
&lt;url&gt;https://repository.apache.org/content/repositories/snapshots/&lt;/url&gt;
&lt;releases&gt;
&lt;enabled&gt;false&lt;/enabled&gt;
&lt;/releases&gt;
&lt;snapshots&gt;
&lt;enabled&gt;true&lt;/enabled&gt;
&lt;/snapshots&gt;
&lt;/repository&gt;
&lt;/repositories&gt;
&lt;/profile&gt;
</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></div></div></li> <li><p>之后您可以在您的工程中增加如下依赖:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> &lt;dependency&gt;
&lt;groupId&gt;org.apache.iotdb&lt;/groupId&gt;
&lt;artifactId&gt;tsfile&lt;/artifactId&gt;
&lt;version&gt;0.10.0&lt;/version&gt;
&lt;/dependency&gt;
</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></div></div></li></ul></li></ul> <h2 id="tsfile-的使用"><a href="#tsfile-的使用" class="header-anchor">#</a> TSFile 的使用</h2> <p>本章节演示TsFile的详细用法。</p> <h3 id="时序数据-time-series-data"><a href="#时序数据-time-series-data" class="header-anchor">#</a> 时序数据(Time-series Data)</h3> <p>一个时序是由4个序列组成,分别是 device, measurement, time, value。</p> <ul><li><p><strong>measurement</strong>: 时间序列描述的是一个物理或者形式的测量(measurement),比如:城市的温度,一些商品的销售数量或者是火车在不同时间的速度。
传统的传感器(如温度计)也采用单次测量(measurement)并产生时间序列,我们将在下面交替使用测量(measurement)和传感器。</p></li> <li><p><strong>device</strong>: 一个设备指的是一个正在进行多次测量(产生多个时间序列)的实体,例如,
​ ​ ​ 一列正在运行的火车监控它的速度、油表、它已经运行的英里数,当前的乘客每个都被传送到一个时间序列。</p></li></ul> <p>表1描述了一组时间序列数据。下表中显示的集合包含一个名为 &quot;device_1&quot; 的设备,它有三个测量值(measurement)分别是
&quot;sensor_1&quot;, &quot;sensor_2&quot; 和 &quot;sensor_3&quot;.</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>单行数据</strong>: 在许多工业应用程序中,一个设备通常包含多个传感器,这些传感器可能同时具有多个值,这称为一行数据。</p> <p>在形式上,一行数据包含一个<code>device_id</code>,它是一个时间戳,表示从 1970年1月1日 00:00:00 开始的毫秒数,
以及由<code>measurement_id</code>和相应的<code>value</code>组成的几个数据对。一行中的所有数据对都属于这个<code>device_id</code>,并且具有相同的时间戳。
如果其中一个度量值<code>measurements</code>在某个时间戳<code>timestamp</code>没有值<code>value</code>,将使用一个空格表示(实际上 TsFile 并不存储 null 值)。
其格式如下:</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>示例数据如下所示。在本例中,两个度量值(measurement)的数据类型分别是<code>INT32</code><code>FLOAT</code></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><h3 id="写入-tsfile"><a href="#写入-tsfile" class="header-anchor">#</a> 写入 TsFile</h3> <h4 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</h4> <p>TsFile可以通过以下三个步骤生成,完整的代码参见&quot;写入 TsFile 示例&quot;章节。</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 schema</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>预定义 schema</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(File file, Schema schema) throws IOException
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这个是用于使用 HDFS 文件系统的。<code>TsFileOutput</code>可以是<code>HDFSOutput</code>类的一个实例。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(TsFileOutput output, Schema schema) throws IOException
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如果你想自己设置一些 TSFile 的配置,你可以使用<code>config</code>参数。比如:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig conf = new TSFileConfig();
conf.setTSFileStorageFs(&quot;HDFS&quot;);
TsFileWriter tsFileWriter = new TsFileWriter(file, schema, conf);
</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>在上面的例子中,数据文件将存储在 HDFS 中,而不是本地文件系统中。如果你想在本地文件系统中存储数据文件,你可以使用<code>conf.setTSFileStorageFs(&quot;LOCAL&quot;)</code>,这也是默认的配置。</p> <p>您还可以通过<code>config.setHdfsIp(...)</code><code>config.setHdfsPort(...)</code>来配置 HDFS 的 IP 和端口。默认的 IP是<code>localhost</code>,默认的端口是<code>9000</code>.</p> <p><strong>参数:</strong></p> <ul><li><p>file : 写入 TsFile 数据的文件</p></li> <li><p>schema : 文件的 schemas,将在下章进行介绍</p></li> <li><p>config : TsFile 的一些配置项</p></li></ul></li> <li><p>第二步,添加测量值(measurement)</p> <p>你也可以先创建一个<code>Schema</code>类的实例然后把它传递给<code>TsFileWriter</code>类的构造函数</p> <p><code>Schema</code>类保存的是一个映射关系,key 是一个 measurement 的名字,value 是 measurement schema.</p> <p>下面是一系列接口:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>// Create an empty Schema or from an existing map
public Schema()
public Schema(Map&lt;String, MeasurementSchema&gt; measurements)
// Use this two interfaces to add measurements
public void registerMeasurement(MeasurementSchema descriptor)
public void registerMeasurements(Map&lt;String, MeasurementSchema&gt; measurements)
// Some useful getter and checker
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></div></div><p>你可以在<code>TsFileWriter</code>类中使用以下接口来添加额外的测量(measurement):
</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>类保存了一个测量(measurement)的信息,有几个构造函数:</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></div></div><p><strong>参数:</strong>
</p> <ul><li><p>measurementID: 测量的名称,通常是传感器的名称。</p></li> <li><p>type: 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: 编码类型. 参见 <a href="/zh/UserGuide/Master/Concept/Encoding.html">Chapter 2-3</a>.</p></li> <li><p>compression: 压缩方式. 现在支持 <code>UNCOMPRESSED</code><code>SNAPPY</code>.</p></li> <li><p>props: 特殊数据类型的属性。比如说<code>FLOAT</code><code>DOUBLE</code>可以设置<code>max_point_number</code><code>TEXT</code>可以设置<code>max_string_length</code>
可以使用Map来保存键值对,比如(&quot;max_point_number&quot;, &quot;3&quot;)。</p></li></ul> <blockquote><p><strong>注意:</strong> 虽然一个测量(measurement)的名字可以被用在多个deltaObjects中, 但是它的参数是不允许被修改的。比如:
不允许多次为同一个测量(measurement)名添加不同类型的编码。下面是一个错误示例:</p></blockquote> <div class="language- extra-class"><pre><code> // The measurement &quot;sensor_1&quot; is float type
addMeasurement(new MeasurementSchema(&quot;sensor_1&quot;, TSDataType.FLOAT, TSEncoding.RLE));
// This call will throw a WriteProcessException exception
addMeasurement(new MeasurementSchema(&quot;sensor_1&quot;, TSDataType.INT32, TSEncoding.RLE));
</code></pre></div></li> <li><p>第三,插入和写入数据。</p> <p>使用这个接口创建一个新的<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>(度量(measurement)和值的对应),并使用 addTuple 方法将数据 DataPoint 添加正确的值到 TsRecord。</p> <p>用下面这种方法写</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>方法来完成写入过程。</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> <p>我们也支持将数据写入已关闭的 TsFile 文件中。</p> <ul><li>使用<code>ForceAppendTsFileWriter</code>打开已经关闭的文件。</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public ForceAppendTsFileWriter(File file) throws IOException
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li><p>调用 <code>doTruncate</code> 去掉文件的Metadata部分</p></li> <li><p>然后使用 <code>ForceAppendTsFileWriter</code> 构造另一个<code>TsFileWriter</code></p></li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>public TsFileWriter(TsFileIOWriter fileWriter) throws IOException
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>请注意 此时需要重新添加测量值(measurement) 再进行上述写入操作。</p> <h4 id="写入-tsfile-示例"><a href="#写入-tsfile-示例" class="header-anchor">#</a> 写入 TsFile 示例</h4> <p>您需要安装 TsFile 到本地的 Maven 仓库中。</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>如果存在<strong>非对齐</strong>的时序数据(比如:不是所有的传感器都有值),您可以通过构造<strong>TSRecord</strong>来写入。</p> <p>更详细的例子可以在<code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTSRecord.java</code>中查看</p> <p>如果所有时序数据都是<strong>对齐</strong>的,您可以通过构造<strong>Tablet</strong>来写入数据。</p> <p>更详细的例子可以在<code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTablet.java</code>中查看</p> <p>在已关闭的TsFile 文件中写入新数据的详细例子可以在<code>/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileForceAppendWrite.java</code>中查看</p> <h3 id="读取-tsfile-接口"><a href="#读取-tsfile-接口" class="header-anchor">#</a> 读取 TsFile 接口</h3> <h4 id="开始之前"><a href="#开始之前" class="header-anchor">#</a> 开始之前</h4> <p>&quot;时序数据&quot;章节中的数据集在本章节做具体的介绍。下表中显示的集合包含一个名为&quot;device_1&quot;的 deltaObject,包含了 3 个名为&quot;sensor_1&quot;,&quot;sensor_2&quot;和&quot;sensor_3&quot;的测量(measurement)。
测量值被简化成一个简单的例子,每条数据只包含 4 条时间和值的对应数据。</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> <h4 id="路径的定义"><a href="#路径的定义" class="header-anchor">#</a> 路径的定义</h4> <p>路径是一个点(.)分隔的字符串,它唯一地标识 TsFile 中的时间序列,例如:&quot;root.area_1.device_1.sensor_1&quot;。
最后一部分&quot;sensor_1&quot;称为&quot;measurementId&quot;,其余部分&quot;root.area_1.device_1&quot;称为deviceId。
正如之前提到的,不同设备中的相同测量(measurement)具有相同的数据类型和编码,设备也是唯一的。</p> <p>在read接口中,参数<code>paths</code>表示要选择的测量值(measurement)。
Path实例可以很容易地通过类<code>Path</code>来构造。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>我们可以为查询传递一个 ArrayList 路径,以支持多个路径查询。</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><strong>注意:</strong> 在构造路径时,参数的格式应该是一个点(.)分隔的字符串,最后一部分是measurement,其余部分确认为deviceId。</p></blockquote> <h4 id="定义-filter"><a href="#定义-filter" class="header-anchor">#</a> 定义 Filter</h4> <h5 id="使用条件过滤"><a href="#使用条件过滤" class="header-anchor">#</a> 使用条件过滤</h5> <p>在 TsFile 读取过程中使用 Filter 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,它将被传递给系统查询时调用。
我们创建一个或多个筛选器表达式,并且可以使用<code>Binary Filter Operators</code>将它们连接形成最终表达式。</p> <ul><li><p><strong>创建一个Filter表达式</strong></p> <p>有两种类型的过滤器。</p> <ul><li><p>TimeFilter: 使用时序数据中的<code>time</code>过滤。</p> <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><p>使用以下关系获得一个<code>TimeFilter</code>对象(值是一个 long 型变量)。
<center><table style="text-align:center;"><tr><th>Relationship</th><th>Description</th></tr> <tr><td>TimeFilter.eq(value)</td><td>选择时间等于值的数据</td></tr> <tr><td>TimeFilter.lt(value)</td><td>选择时间小于值的数据</td></tr> <tr><td>TimeFilter.gt(value)</td><td>选择时间大于值的数据</td></tr> <tr><td>TimeFilter.ltEq(value)</td><td>选择时间小于等于值的数据</td></tr> <tr><td>TimeFilter.gtEq(value)</td><td>选择时间大于等于值的数据</td></tr> <tr><td>TimeFilter.notEq(value)</td><td>选择时间不等于值的数据</td></tr> <tr><td>TimeFilter.not(TimeFilter)</td><td>选择时间不满足另一个时间过滤器的数据</td></tr></table></center></p></li> <li><p>ValueFilter: 使用时序数据中的<code>value</code>过滤。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IExpression valueFilterExpr = new SingleSeriesExpression(Path, ValueFilter);
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><code>ValueFilter</code>的用法与<code>TimeFilter</code>相同,只是需要确保值的类型等于measurement(在路径中定义)的类型。</p></li></ul></li> <li><p><strong>Binary Filter Operators</strong></p> <p>Binary filter operators 可以用来连接两个单独的表达式。</p> <ul><li>BinaryExpression.and(Expression, Expression): 选择同时满足两个表达式的数据。</li> <li>BinaryExpression.or(Expression, Expression): 选择满足任意一个表达式值的数据。</li></ul></li></ul> <h5 id="filter-expression-示例"><a href="#filter-expression-示例" class="header-anchor">#</a> Filter Expression 示例</h5> <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> <h4 id="读取接口"><a href="#读取接口" class="header-anchor">#</a> 读取接口</h4> <p>首先,我们打开 TsFile 并从文件路径<code>path</code>中获取一个<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,然后通过这个接口得到最终的<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类有两个<code>query</code>方法来执行查询。</p> <ul><li><p><strong>Method 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>Method 2</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>此方法是为高级应用(如 TsFile-Spark 连接器)设计的。</p> <ul><li><strong>参数</strong> : 对于 method 2,添加了两个额外的参数来支持部分查询(Partial Query):
<ul><li><code>partitionStartOffset</code>: TsFile 的开始偏移量</li> <li><code>partitionEndOffset</code>: TsFile 的结束偏移量
</li></ul> <blockquote><p><strong>什么是部分查询?</strong></p> <p>在一些分布式文件系统中(比如:HDFS), 文件被分成几个部分,这些部分被称为&quot;Blocks&quot;并存储在不同的节点中。在涉及的每个节点上并行执行查询可以提高效率。因此需要部分查询(Partial Query)。部分查询(Partial Query)仅支持查询 TsFile 中被<code>QueryConstant.PARTITION_START_OFFSET</code><code>QueryConstant.PARTITION_END_OFFSET</code>分割的部分。</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>下面是一些用户常用的接口:</p> <ul><li><p><code>bool hasNext();</code></p> <p>如果该数据集仍然有数据,则返回true。</p></li> <li><p><code>List&lt;Path&gt; getPaths()</code></p> <p>获取这个数据集中的路径。</p></li> <li><p><code>List&lt;TSDataType&gt; getDataTypes();</code></p> <p>获取数据类型。TSDataType 是一个 enum 类,其值如下:</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>类包含一个<code>long</code>类型的时间戳和一个<code>List&lt;Field&gt;</code>,用于不同传感器中的数据,我们可以使用两个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> <h4 id="读取现有-tsfile-示例"><a href="#读取现有-tsfile-示例" class="header-anchor">#</a> 读取现有 TsFile 示例</h4> <p>您需要安装 TsFile 到本地的 Maven 仓库中。</p> <p>有关查询语句的更详细示例,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">/**
* The class is to show how to read TsFile file named &quot;test.tsfile&quot;.
* The TsFile file &quot;test.tsfile&quot; is generated from class TsFileWrite.
* Run TsFileWrite to generate the test.tsfile first
*/</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">// file path</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">// create reader and get the readTsFile interface</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">// use these paths(all sensors) for all the queries</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">// no query statement</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">//close the reader when you left</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="修改-tsfile-配置项"><a href="#修改-tsfile-配置项" class="header-anchor">#</a> 修改 TsFile 配置项</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>TSFileConfig config = TSFileDescriptor.getInstance().getConfig();
config.setXXX();
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev">
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Disclaimer: Apache IoTDB (incubating) is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
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