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160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#schema-模式定义">Schema(模式定义)</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#写入接口">写入接口</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#创建-关闭-tsfile-写入文件">创建/关闭 TsFile 写入文件</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#创建-关闭-tsfile-writer">创建/关闭 TsFile Writer</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#创建-关闭-插入数据-tablet">创建/关闭/插入数据 Tablet</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#将-tablet-写入-tsfile">将 Tablet 写入 TsFile</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#读取接口">读取接口</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#tsfile-reader-创建-关闭">TsFile Reader 创建/关闭</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#查询表-获取下一行">查询表 / 获取下一行</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#从结果集中获取数据">从结果集中获取数据</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#从-tsfile-reader-中获取表定义">从 TsFile Reader 中获取表定义</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--]--><!----></aside></div><!----><div class="theme-hope-content" vp-content><h1 id="接口定义-c" tabindex="-1"><a class="header-anchor" href="#接口定义-c"><span>接口定义 - C</span></a></h1><h2 id="schema-模式定义" tabindex="-1"><a class="header-anchor" href="#schema-模式定义"><span>Schema(模式定义)</span></a></h2><div class="language-c++ line-numbers-mode" data-highlighter="shiki" data-ext="c++" data-title="c++" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#C678DD;">typedef</span><span style="color:#C678DD;"> enum</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_BOOLEAN</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_INT32</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 1</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_INT64</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 2</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_FLOAT</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 3</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_DOUBLE</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 4</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_TEXT</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 5</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> TS_DATATYPE_STRING</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 11</span></span>
<span class="line"><span style="color:#ABB2BF;">} TSDataType;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">typedef</span><span style="color:#C678DD;"> enum</span><span style="color:#E5C07B;"> column_category</span><span style="color:#ABB2BF;"> { </span><span style="color:#E06C75;">TAG</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">, </span><span style="color:#E06C75;">FIELD</span><span style="color:#C678DD;"> =</span><span style="color:#D19A66;"> 1</span><span style="color:#ABB2BF;"> } ColumnCategory;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">// ColumnSchema:表示单个列的模式,包括列名、数据类型和分类。</span></span>
<span class="line"><span style="color:#C678DD;">typedef</span><span style="color:#C678DD;"> struct</span><span style="color:#E5C07B;"> column_schema</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> column_name;</span></span>
<span class="line"><span style="color:#ABB2BF;"> TSDataType data_type;</span></span>
<span class="line"><span style="color:#ABB2BF;"> ColumnCategory column_category;</span></span>
<span class="line"><span style="color:#ABB2BF;">} </span><span style="color:#E5C07B;">ColumnSchema</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">// TableSchema:定义一个表的模式,包括表名和列模式数组。</span></span>
<span class="line"><span style="color:#C678DD;">typedef</span><span style="color:#C678DD;"> struct</span><span style="color:#E5C07B;"> table_schema</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> table_name;</span></span>
<span class="line"><span style="color:#ABB2BF;"> ColumnSchema</span><span style="color:#C678DD;">*</span><span style="color:#ABB2BF;"> column_schemas;</span></span>
<span class="line"><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;"> column_num;</span></span>
<span class="line"><span style="color:#ABB2BF;">} </span><span style="color:#E5C07B;">TableSchema</span><span style="color:#ABB2BF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">// ResultSetMetaData:结果集的元数据,包括列名和数据类型。</span></span>
<span class="line"><span style="color:#C678DD;">typedef</span><span style="color:#C678DD;"> struct</span><span style="color:#E5C07B;"> result_set_meta_data</span><span style="color:#ABB2BF;"> {</span></span>
<span class="line"><span style="color:#C678DD;"> char**</span><span style="color:#ABB2BF;"> column_names;</span></span>
<span class="line"><span style="color:#ABB2BF;"> TSDataType</span><span style="color:#C678DD;">*</span><span style="color:#ABB2BF;"> data_types;</span></span>
<span class="line"><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;"> column_num;</span></span>
<span class="line"><span style="color:#ABB2BF;">} </span><span style="color:#E5C07B;">ResultSetMetaData</span><span style="color:#ABB2BF;">;</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="写入接口" tabindex="-1"><a class="header-anchor" href="#写入接口"><span>写入接口</span></a></h2><h3 id="创建-关闭-tsfile-写入文件" tabindex="-1"><a class="header-anchor" href="#创建-关闭-tsfile-写入文件"><span>创建/关闭 TsFile 写入文件</span></a></h3><div class="language-c++ line-numbers-mode" data-highlighter="shiki" data-ext="c++" data-title="c++" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 创建写入文件。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> pathname</span><span style="color:#7F848E;font-style:italic;"> 目标文件路径。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#7F848E;font-style:italic;"> [输出] RET_OK(0),或 errno_define_c.h 中的错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> WriteFile 成功返回有效句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用 free_write_file() 释放资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用 free_write_file() 前,需确保 TsFileWriter 已关闭。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#E5C07B;">WriteFile</span><span style="color:#61AFEF;"> write_file_new</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> pathname</span><span style="color:#ABB2BF;">, </span><span style="color:#E5C07B;">ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">void</span><span style="color:#61AFEF;"> free_write_file</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">WriteFile</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> write_file</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="创建-关闭-tsfile-writer" tabindex="-1"><a class="header-anchor" href="#创建-关闭-tsfile-writer"><span>创建/关闭 TsFile Writer</span></a></h3><p>在创建 TsFile Writer 时,需要指定 WriteFile 和 TableSchema。你可以使用 tsfile_writer_new_with_memory_threshold 设置内存阈值。</p><div class="language-c++ line-numbers-mode" data-highlighter="shiki" data-ext="c++" data-title="c++" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 创建 TsFileWriter。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> file</span><span style="color:#7F848E;font-style:italic;"> 写入目标文件。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> schema</span><span style="color:#7F848E;font-style:italic;"> 表结构定义。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * - 由调用者负责释放。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#7F848E;font-style:italic;"> [输出] RET_OK(0),或 errno_define_c.h 中的错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> TsFileWriter 成功返回有效句柄,失败返回 NULL。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 使用完毕后需调用 tsfile_writer_close() 释放资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#E5C07B;">TsFileWriter</span><span style="color:#61AFEF;"> tsfile_writer_new</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">WriteFile</span><span style="color:#E06C75;font-style:italic;"> file</span><span style="color:#ABB2BF;">, </span><span style="color:#E5C07B;">TableSchema</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> schema</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E5C07B;"> ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 创建 TsFileWriter,带内存阈值限制。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> file</span><span style="color:#7F848E;font-style:italic;"> 写入目标文件。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> schema</span><span style="color:#7F848E;font-style:italic;"> 表结构定义。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * - 由调用者负责释放。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> memory_threshold</span><span style="color:#7F848E;font-style:italic;"> 超过该内存阈值时会自动刷盘。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#7F848E;font-style:italic;"> [输出] RET_OK(0),或 errno_define_c.h 中的错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> TsFileWriter 成功返回有效句柄,失败返回 NULL。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 使用完毕后需调用 tsfile_writer_close() 释放资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#E5C07B;">TsFileWriter</span><span style="color:#61AFEF;"> tsfile_writer_new_with_memory_threshold</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">WriteFile</span><span style="color:#E06C75;font-style:italic;"> file</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E5C07B;"> TableSchema</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> schema</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint64_t</span><span style="color:#E06C75;font-style:italic;"> memory_threshold</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E5C07B;"> ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 释放 TsFileWriter 相关资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> writer</span><span style="color:#7F848E;font-style:italic;"> [输入] 来自 tsfile_writer_new() 的 Writer 句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * 调用后该句柄失效,不可重复使用。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> ERRNO - 成功返回 RET_OK(0),否则返回错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#E5C07B;">ERRNO</span><span style="color:#61AFEF;"> tsfile_writer_close</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">TsFileWriter</span><span style="color:#E06C75;font-style:italic;"> writer</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="创建-关闭-插入数据-tablet" tabindex="-1"><a class="header-anchor" href="#创建-关闭-插入数据-tablet"><span>创建/关闭/插入数据 Tablet</span></a></h3><p>可以使用 Tablet 批量插入数据。数据写入后需释放对应内存资源。</p><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 创建用于批量写入的 Tablet。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_name_list</span><span style="color:#7F848E;font-style:italic;"> [输入] 列名数组,长度为 column_num。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> data_types</span><span style="color:#7F848E;font-style:italic;"> [输入] 数据类型数组,长度为 column_num。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_num</span><span style="color:#7F848E;font-style:italic;"> [输入] 列数量,必须 ≥ 1。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> max_rows</span><span style="color:#7F848E;font-style:italic;"> [输入] 预分配的最大行数,必须 ≥ 1。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> Tablet 成功返回有效句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 使用完后需调用 free_tablet() 释放资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">Tablet </span><span style="color:#61AFEF;">tablet_new</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">char**</span><span style="color:#E06C75;font-style:italic;"> column_name_list</span><span style="color:#ABB2BF;">,</span><span style="color:#E06C75;"> TSDataType</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> data_types</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_num</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> max_rows</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 获取当前 Tablet 中的行数。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> tablet</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效 Tablet 句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> uint32_t 当前行数 (0 到 max_rows-1)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">uint32_t</span><span style="color:#61AFEF;"> tablet_get_cur_row_size</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 向指定行设置时间戳。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> tablet</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效 Tablet。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#7F848E;font-style:italic;"> [输入] 目标行号 (0 ≤ index &lt; max_rows)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> timestamp</span><span style="color:#7F848E;font-style:italic;"> [输入] 时间戳 (int64_t 类型)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> ERRNO - 成功返回 RET_OK(0),否则返回错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_timestamp</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> Timestamp </span><span style="color:#E06C75;font-style:italic;">timestamp</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 按列名为指定行添加字符串值。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#7F848E;font-style:italic;"> [输入] 以 &#39;\0&#39; 结尾的字符串,调用者保留所有权。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_name_string</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> // 支持多种数据类型插入</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#56B6C2;">tablet_add_value_by_name_int32_t</span><span style="color:#ABB2BF;">(Tablet tablet, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> row_index,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> column_name,</span></span>
<span class="line"><span style="color:#C678DD;"> int32_t</span><span style="color:#ABB2BF;"> value);</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#56B6C2;">tablet_add_value_by_name_int64_t</span><span style="color:#ABB2BF;">(Tablet tablet, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> row_index,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> column_name,</span></span>
<span class="line"><span style="color:#C678DD;"> int64_t</span><span style="color:#ABB2BF;"> value);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_name_double</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> double</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_name_float</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> float</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_name_bool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> bool</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 按列索引为指定行添加值(支持多种数据类型)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#7F848E;font-style:italic;"> [输入] 字符串会被内部复制。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_index_string</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#56B6C2;">tablet_add_value_by_index_int32_t</span><span style="color:#ABB2BF;">(Tablet tablet, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> row_index,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#ABB2BF;"> column_index,</span></span>
<span class="line"><span style="color:#C678DD;"> int32_t</span><span style="color:#ABB2BF;"> value);</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#56B6C2;">tablet_add_value_by_index_int64_t</span><span style="color:#ABB2BF;">(Tablet tablet, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> row_index,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#ABB2BF;"> column_index,</span></span>
<span class="line"><span style="color:#C678DD;"> int64_t</span><span style="color:#ABB2BF;"> value);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_index_double</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> double</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_index_float</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> float</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tablet_add_value_by_index_bool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> row_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> bool</span><span style="color:#E06C75;font-style:italic;"> value</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#C678DD;">void</span><span style="color:#61AFEF;"> free_tablet</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">Tablet</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> tablet</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="将-tablet-写入-tsfile" tabindex="-1"><a class="header-anchor" href="#将-tablet-写入-tsfile"><span>将 Tablet 写入 TsFile</span></a></h3><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 将 Tablet 中的数据写入 TsFile。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> writer</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的 TsFileWriter 句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> tablet</span><span style="color:#7F848E;font-style:italic;"> [输入] 含数据的 Tablet,写入后可释放。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tsfile_writer_write</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TsFileWriter </span><span style="color:#E06C75;font-style:italic;">writer</span><span style="color:#ABB2BF;">,</span><span style="color:#E06C75;"> Tablet </span><span style="color:#E06C75;font-style:italic;">tablet</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="读取接口" tabindex="-1"><a class="header-anchor" href="#读取接口"><span>读取接口</span></a></h2><h3 id="tsfile-reader-创建-关闭" tabindex="-1"><a class="header-anchor" href="#tsfile-reader-创建-关闭"><span>TsFile Reader 创建/关闭</span></a></h3><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 创建用于读取 TsFile 的 TsFileReader。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> pathname</span><span style="color:#7F848E;font-style:italic;"> [输入] TsFile 路径。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#7F848E;font-style:italic;"> [输出] RET_OK(0) 或错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> 成功时返回有效句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 使用 tsfile_reader_close() 释放资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">TsFileReader </span><span style="color:#61AFEF;">tsfile_reader_new</span><span style="color:#ABB2BF;">(</span><span style="color:#C678DD;">const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> pathname</span><span style="color:#ABB2BF;">,</span><span style="color:#E06C75;"> ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 释放 TsFileReader 占用的资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用后句柄失效,且由此句柄获得的结果集也失效。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ERRNO </span><span style="color:#61AFEF;">tsfile_reader_close</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TsFileReader </span><span style="color:#E06C75;font-style:italic;">reader</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查询表-获取下一行" tabindex="-1"><a class="header-anchor" href="#查询表-获取下一行"><span>查询表 / 获取下一行</span></a></h3><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 在指定时间范围内,从指定表和列中查询数据。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> reader</span><span style="color:#7F848E;font-style:italic;"> [输入] 通过 tsfile_reader_new() 获取的有效 TsFileReader 句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> table_name</span><span style="color:#7F848E;font-style:italic;"> [输入] 目标表名,必须存在于 TsFile 中。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> columns</span><span style="color:#7F848E;font-style:italic;"> [输入] 要查询的列名数组。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_num</span><span style="color:#7F848E;font-style:italic;"> [输入] 列名数组中的列数。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> start_time</span><span style="color:#7F848E;font-style:italic;"> [输入] 起始时间戳。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> end_time</span><span style="color:#7F848E;font-style:italic;"> [输入] 结束时间戳,必须大于等于 start_time。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#7F848E;font-style:italic;"> [输出] 成功返回 RET_OK(0),否则返回 errno_define_c.h 中定义的错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> ResultSet 查询结果集句柄。使用完成后必须通过 free_tsfile_result_set() 释放。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ResultSet </span><span style="color:#61AFEF;">tsfile_query_table</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TsFileReader </span><span style="color:#E06C75;font-style:italic;">reader</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> table_name</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> char**</span><span style="color:#E06C75;font-style:italic;"> columns</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_num</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> Timestamp </span><span style="color:#E06C75;font-style:italic;">start_time</span><span style="color:#ABB2BF;">,</span><span style="color:#E06C75;"> Timestamp </span><span style="color:#E06C75;font-style:italic;">end_time</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#E06C75;"> ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> err_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 检查并获取结果集中的下一行数据。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的 ResultSet 句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> error_code</span><span style="color:#7F848E;font-style:italic;"> [输出] 成功返回 RET_OK(0),否则返回 errno_define_c.h 中的错误码。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> bool - true:存在下一行数据,false:已到达末尾或发生错误。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">bool</span><span style="color:#61AFEF;"> tsfile_result_set_next</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#E06C75;"> ERRNO</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> error_code</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 释放结果集资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的 ResultSet 句柄指针。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">void</span><span style="color:#61AFEF;"> free_tsfile_result_set</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet</span><span style="color:#C678DD;">*</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="从结果集中获取数据" tabindex="-1"><a class="header-anchor" href="#从结果集中获取数据"><span>从结果集中获取数据</span></a></h3><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 判断当前行中指定列(按列名)对应的值是否为 NULL。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 当前处于有效行的 ResultSet(需在调用 next() 返回 true 之后)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#7F848E;font-style:italic;"> [输入] 结果集模式中存在的列名。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> bool - true:值为 NULL 或找不到该列,false:值有效。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">bool</span><span style="color:#61AFEF;"> tsfile_result_set_is_null_by_name</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 判断当前行中指定列(按列索引)对应的值是否为 NULL。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#7F848E;font-style:italic;"> [输入] 列的位置(1 &lt;= 索引 &lt;= 结果集列数)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> bool - true:值为 NULL 或索引超出范围,false:值有效。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">bool</span><span style="color:#61AFEF;"> tsfile_result_set_is_null_by_index</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 根据列名获取当前行中的字符串值。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#7F848E;font-style:italic;"> [输入] 要获取的列名。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> char* - 字符串指针。调用者在使用完后必须手动释放该指针。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">char*</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_name_string</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> column_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">bool</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_name_bool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#C678DD;">int32_t</span><span style="color:#56B6C2;"> tsfile_result_set_get_value_by_name_int32_t</span><span style="color:#ABB2BF;">(ResultSet result_set, </span><span style="color:#C678DD;">const</span><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;"> column_name);</span></span>
<span class="line"><span style="color:#C678DD;">int64_t</span><span style="color:#56B6C2;"> tsfile_result_set_get_value_by_name_int64_t</span><span style="color:#ABB2BF;">(ResultSet result_set, </span><span style="color:#C678DD;">const</span><span style="color:#C678DD;"> char*</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;"> column_name);</span></span>
<span class="line"><span style="color:#C678DD;">float</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_name_float</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#C678DD;">double</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_name_double</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 根据列索引获取当前行中的字符串值。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#7F848E;font-style:italic;"> [输入] 要获取的列索引(1 &lt;= 索引 &lt;= 列总数)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> char* - 字符串指针。调用者在使用完后必须手动释放该指针。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">char*</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_index_string</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">int32_t</span><span style="color:#56B6C2;"> tsfile_result_set_get_value_by_index_int32_t</span><span style="color:#ABB2BF;">(ResultSet result_set, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;"> column_index);</span></span>
<span class="line"><span style="color:#C678DD;">int64_t</span><span style="color:#56B6C2;"> tsfile_result_set_get_value_by_index_int64_t</span><span style="color:#ABB2BF;">(ResultSet result_set, </span><span style="color:#C678DD;">uint32_t</span><span style="color:#ABB2BF;"> </span></span>
<span class="line"><span style="color:#ABB2BF;"> column_index);</span></span>
<span class="line"><span style="color:#C678DD;">float</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_index_float</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#C678DD;">double</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_index_double</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#C678DD;">bool</span><span style="color:#61AFEF;"> tsfile_result_set_get_value_by_index_bool</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;"> </span></span>
<span class="line"><span style="color:#E06C75;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 获取描述结果集模式的元数据信息。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> ResultSetMetaData 元数据句柄。调用者在使用后应释放该元数据。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用该函数前应检查 result_set 是否为 NULL,NULL 可能表示查询执行失败。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">ResultSetMetaData </span><span style="color:#61AFEF;">tsfile_result_set_get_metadata</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSet </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 根据索引从元数据中获取列名。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set_meta_data</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集元数据句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#7F848E;font-style:italic;"> [输入] 列的位置(1 &lt;= 索引 &lt;= 列总数)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> const char* 只读字符串。如果索引无效则返回 NULL。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">char*</span><span style="color:#61AFEF;"> tsfile_result_set_metadata_get_column_name</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSetMetaData </span><span style="color:#E06C75;font-style:italic;">result_set_meta_data</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 根据索引从元数据中获取列的数据类型。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set_meta_data</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集元数据句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#7F848E;font-style:italic;"> [输入] 列的位置(1 &lt;= 索引 &lt;= 列总数)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> TSDataType 若索引无效则返回 TS_DATATYPE_INVALID(255)。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#ABB2BF;">TSDataType </span><span style="color:#61AFEF;">tsfile_result_set_metadata_get_data_type</span><span style="color:#ABB2BF;">(</span></span>
<span class="line"><span style="color:#E06C75;"> ResultSetMetaData </span><span style="color:#E06C75;font-style:italic;">result_set_meta_data</span><span style="color:#ABB2BF;">,</span><span style="color:#C678DD;"> uint32_t</span><span style="color:#E06C75;font-style:italic;"> column_index</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 获取结果集模式中的列总数。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> result_set_meta_data</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的结果集元数据句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> int 结果集中列的数量。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"><span style="color:#C678DD;">int</span><span style="color:#61AFEF;"> tsfile_result_set_metadata_get_column_num</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">ResultSetMetaData </span><span style="color:#E06C75;font-style:italic;">result_set</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="从-tsfile-reader-中获取表定义" tabindex="-1"><a class="header-anchor" href="#从-tsfile-reader-中获取表定义"><span>从 TsFile Reader 中获取表定义</span></a></h3><div class="language-c line-numbers-mode" data-highlighter="shiki" data-ext="c" data-title="c" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 获取 TsFile 中指定表的模式信息。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> reader</span><span style="color:#7F848E;font-style:italic;"> [输入] 有效的读取器句柄。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> table_name</span><span style="color:#7F848E;font-style:italic;"> [输入] 目标表名,必须存在于 TsFile 中。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> TableSchema 包含表及其列的信息。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用者应调用 free_table_schema 释放返回的 TableSchema 资源。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">TableSchema </span><span style="color:#61AFEF;">tsfile_reader_get_table_schema</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TsFileReader </span><span style="color:#E06C75;font-style:italic;">reader</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> const</span><span style="color:#C678DD;"> char*</span><span style="color:#E06C75;font-style:italic;"> table_name</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 获取 TsFile 中所有表的模式信息。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> size</span><span style="color:#7F848E;font-style:italic;"> [输出] 返回的表模式数组中的元素数量。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@return</span><span style="color:#7F848E;font-style:italic;"> TableSchema* 表模式数组指针。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@note</span><span style="color:#7F848E;font-style:italic;"> 调用者必须对数组中的每个元素调用 free_table_schema(),</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * 并对整个数组指针调用 free() 进行释放。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#ABB2BF;">TableSchema</span><span style="color:#C678DD;">*</span><span style="color:#61AFEF;"> tsfile_reader_get_all_table_schemas</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TsFileReader </span><span style="color:#E06C75;font-style:italic;">reader</span><span style="color:#ABB2BF;">,</span></span>
<span class="line"><span style="color:#C678DD;"> uint32_t*</span><span style="color:#E06C75;font-style:italic;"> size</span><span style="color:#ABB2BF;">);</span></span>
<span class="line"></span>
<span class="line"><span style="color:#7F848E;font-style:italic;">/**</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@brief</span><span style="color:#7F848E;font-style:italic;"> 释放 TableSchema 占用的内存空间。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> *</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> * </span><span style="color:#C678DD;font-style:italic;">@param</span><span style="color:#E06C75;font-style:italic;"> schema</span><span style="color:#7F848E;font-style:italic;"> [输入] 需要释放的表模式结构。</span></span>
<span class="line"><span style="color:#7F848E;font-style:italic;"> */</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C678DD;">void</span><span style="color:#61AFEF;"> free_table_schema</span><span style="color:#ABB2BF;">(</span><span style="color:#E06C75;">TableSchema </span><span style="color:#E06C75;font-style:italic;">schema</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></div><!----><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link vp-meta-label" href="https://github.com/apache/tsfile/edit/docs/dev/src/zh/UserGuide/latest/QuickStart/InterfaceDefinition/InterfaceDefinition-C.md" aria-label="发现错误?在 GitHub 上编辑此页" rel="noopener noreferrer" target="_blank" iconsizing="both"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon" name="edit"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误?在 GitHub 上编辑此页<!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">上次编辑于: </span><span class="vp-meta-info" data-allow-mismatch="text">2025/12/30 03:29:28</span></div><!----></div></footer><nav class="vp-page-nav"><!----><a class="route-link auto-link next" href="/zh/UserGuide/latest/QuickStart/InterfaceDefinition/InterfaceDefinition-CPP.html" aria-label="接口定义-C++" iconsizing="both"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">接口定义-C++<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:1rem;padding-top:1rem;"><span id="doc-version" style="display:none;">latest</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2025 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on issues. </p></footer></div><!--]--><!--]--><!--[--><!----><!--[--><!--]--><!--]--><!--]--></div>
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