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class="vp-page-title"><h1><!---->Quick Start - C++</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="Writing Date📅" data-balloon-pos="up"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon" name="calendar"><path d="M716.4 110.137c0-18.753-14.72-33.473-33.472-33.473-18.753 0-33.473 14.72-33.473 33.473v33.473h66.993v-33.473zm-334.87 0c0-18.753-14.72-33.473-33.473-33.473s-33.52 14.72-33.52 33.473v33.473h66.993v-33.473zm468.81 33.52H716.4v100.465c0 18.753-14.72 33.473-33.472 33.473a33.145 33.145 0 01-33.473-33.473V143.657H381.53v100.465c0 18.753-14.72 33.473-33.473 33.473a33.145 33.145 0 01-33.473-33.473V143.657H180.6A134.314 134.314 0 0046.66 277.595v535.756A134.314 134.314 0 00180.6 947.289h669.74a134.36 134.36 0 00133.94-133.938V277.595a134.314 134.314 0 00-133.94-133.938zm33.473 267.877H147.126a33.145 33.145 0 01-33.473-33.473c0-18.752 14.72-33.473 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88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 2 min</span><meta property="timeRequired" content="PT2M"></span><!----><!----></div><hr></div><div class="vp-toc-placeholder"><aside id="toc" vp-toc><!----><!--[--><div class="vp-toc-header">On This Page<button type="button" class="print-button" title="Print"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon" name="print"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 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href="#cmake-integration">CMake Integration</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#writing-process">Writing Process</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#construct-tsfilewriter">Construct TsFileWriter</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#write-data">Write Data</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#close-file">Close File</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#sample-code">Sample Code</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#query-process">Query Process</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#construct-tsfilereader">Construct TsFileReader</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#construct-query-request">Construct Query Request</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#query-data">Query Data</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#close-file-1">Close File</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#sample-code-1">Sample Code</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="quick-start-c" tabindex="-1"><a class="header-anchor" href="#quick-start-c"><span>Quick Start - C++</span></a></h1><h2 id="dependencies" tabindex="-1"><a class="header-anchor" href="#dependencies"><span>Dependencies</span></a></h2><ul><li>CMake >=3.11</li><li>Maven >=3.9.6</li><li>GCC >=4.8.5</li><li>Make >=4.3</li></ul><h2 id="installation-method" tabindex="-1"><a class="header-anchor" href="#installation-method"><span>Installation Method</span></a></h2><p>Clone the source code from git:</p><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" data-title="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#61AFEF;">git</span><span style="color:#98C379;"> clone</span><span style="color:#98C379;"> https://github.com/apache/tsfile.git</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>Run Maven to compile in the TsFile root directory:</p><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" data-title="shell" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#61AFEF;">mvn</span><span style="color:#98C379;"> clean</span><span style="color:#98C379;"> install</span><span style="color:#D19A66;"> -P</span><span style="color:#98C379;"> with-cpp</span><span style="color:#D19A66;"> -DskipTests</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>Note: If Maven is not installed, you can use mvnw on Linux or mvnw.cmd on Windows.</p><h3 id="directory-structure" tabindex="-1"><a class="header-anchor" href="#directory-structure"><span>Directory Structure</span></a></h3><p>• <strong>Include Directory</strong>: Located at <code>tsfile/cpp/target/build/include</code>, it contains header files for integration. Add this path to the compiler's include path (e.g., using <code>-I</code> flag).</p><p>• <strong>Lib Directory</strong>: At <code>tsfile/cpp/target/build/lib</code>, it holds compiled library files. Specify this path and library name when linking (e.g., using <code>-L</code> and <code>-l</code> flags).</p><h3 id="cmake-integration" tabindex="-1"><a class="header-anchor" href="#cmake-integration"><span>CMake Integration</span></a></h3><p>Add to your CMakeLists.txt:</p><div class="language-cmake line-numbers-mode" data-highlighter="shiki" data-ext="cmake" data-title="cmake" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#C678DD;">find_library</span><span style="color:#ABB2BF;">(TSFILE_LIB </span><span style="color:#C678DD;">NAMES</span><span style="color:#ABB2BF;"> tsfile </span><span style="color:#C678DD;">PATHS</span><span style="color:#C678DD;"> ${SDK_LIB}</span><span style="color:#ABB2BF;"> REQUIRED)</span></span> |
| <span class="line"><span style="color:#C678DD;">target_link_libraries</span><span style="color:#ABB2BF;">(your_target </span><span style="color:#C678DD;">${TSFILE_LIB}</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></div><p>Note: Set ${SDK_LIB} to your TSFile library directory.</p><h2 id="writing-process" tabindex="-1"><a class="header-anchor" href="#writing-process"><span>Writing Process</span></a></h2><h3 id="construct-tsfilewriter" tabindex="-1"><a class="header-anchor" href="#construct-tsfilewriter"><span>Construct TsFileWriter</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#ABB2BF;"> std::string file_name </span><span style="color:#C678DD;">=</span><span style="color:#98C379;"> "test.tsfile"</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::</span><span style="color:#61AFEF;">libtsfile_init</span><span style="color:#ABB2BF;">();</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::string table_name </span><span style="color:#C678DD;">=</span><span style="color:#98C379;"> "table1"</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Create a file with specify path to write tsfile.</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::WriteFile file;</span></span> |
| <span class="line"><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;"> flags </span><span style="color:#C678DD;">=</span><span style="color:#ABB2BF;"> O_WRONLY </span><span style="color:#56B6C2;">|</span><span style="color:#ABB2BF;"> O_CREAT </span><span style="color:#56B6C2;">|</span><span style="color:#ABB2BF;"> O_TRUNC;</span></span> |
| <span class="line"><span style="color:#C678DD;">#ifdef</span><span style="color:#ABB2BF;"> _WIN32</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> flags </span><span style="color:#C678DD;">|=</span><span style="color:#ABB2BF;"> O_BINARY;</span></span> |
| <span class="line"><span style="color:#C678DD;">#endif</span></span> |
| <span class="line"><span style="color:#C678DD;"> mode_t</span><span style="color:#ABB2BF;"> mode </span><span style="color:#C678DD;">=</span><span style="color:#E06C75;"> 0</span><span style="color:#D19A66;">666</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#E5C07B;"> file</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">create</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"test_cpp.tsfile"</span><span style="color:#ABB2BF;">, flags, mode);</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Create table schema to describe a table in a tsfile.</span></span> |
| <span class="line"><span style="color:#C678DD;"> auto*</span><span style="color:#ABB2BF;"> schema </span><span style="color:#C678DD;">=</span><span style="color:#C678DD;"> new</span><span style="color:#ABB2BF;"> storage::</span><span style="color:#61AFEF;">TableSchema</span><span style="color:#ABB2BF;">(</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> table_name,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::</span><span style="color:#61AFEF;">ColumnSchema</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"id1"</span><span style="color:#ABB2BF;">, common::STRING, common::UNCOMPRESSED,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::PLAIN, common::ColumnCategory::TAG),</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::</span><span style="color:#61AFEF;">ColumnSchema</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"id2"</span><span style="color:#ABB2BF;">, common::STRING, common::UNCOMPRESSED,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::PLAIN, common::ColumnCategory::TAG),</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::</span><span style="color:#61AFEF;">ColumnSchema</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">, common::INT64, common::UNCOMPRESSED,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::PLAIN, common::ColumnCategory::FIELD),</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> });</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Create a file with specify path to write tsfile.</span></span> |
| <span class="line"><span style="color:#C678DD;"> auto*</span><span style="color:#ABB2BF;"> writer </span><span style="color:#C678DD;">=</span><span style="color:#C678DD;"> new</span><span style="color:#ABB2BF;"> storage::</span><span style="color:#61AFEF;">TsFileTableWriter</span><span style="color:#ABB2BF;">(</span><span style="color:#56B6C2;">&</span><span style="color:#ABB2BF;">file, schema);</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></div><h3 id="write-data" tabindex="-1"><a class="header-anchor" href="#write-data"><span>Write Data</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" 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;"> // Create tablet to insert data.</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::</span><span style="color:#E5C07B;">Tablet</span><span style="color:#61AFEF;"> tablet</span><span style="color:#ABB2BF;">(</span></span> |
| <span class="line"><span style="color:#E5C07B;"> table_name</span><span style="color:#ABB2BF;">, {</span><span style="color:#98C379;">"id1"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"id2"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">},</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> {common::</span><span style="color:#E5C07B;">STRING</span><span style="color:#ABB2BF;">, common::</span><span style="color:#E5C07B;">STRING</span><span style="color:#ABB2BF;">, common::</span><span style="color:#E5C07B;">INT64</span><span style="color:#ABB2BF;">},</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> {common::ColumnCategory::</span><span style="color:#E5C07B;">TAG</span><span style="color:#ABB2BF;">, common::ColumnCategory::</span><span style="color:#E5C07B;">TAG</span><span style="color:#ABB2BF;">,</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> common::ColumnCategory::</span><span style="color:#E5C07B;">FIELD</span><span style="color:#ABB2BF;">},</span></span> |
| <span class="line"><span style="color:#D19A66;"> 10</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">int</span><span style="color:#ABB2BF;"> row </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">; row </span><span style="color:#C678DD;"><</span><span style="color:#D19A66;"> 5</span><span style="color:#ABB2BF;">; row</span><span style="color:#C678DD;">++</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> long</span><span style="color:#ABB2BF;"> timestamp </span><span style="color:#C678DD;">=</span><span style="color:#ABB2BF;"> row;</span></span> |
| <span class="line"><span style="color:#E5C07B;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">add_timestamp</span><span style="color:#ABB2BF;">(row, timestamp);</span></span> |
| <span class="line"><span style="color:#E5C07B;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">add_value</span><span style="color:#ABB2BF;">(row, </span><span style="color:#98C379;">"id1"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"id1_filed_1"</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#E5C07B;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">add_value</span><span style="color:#ABB2BF;">(row, </span><span style="color:#98C379;">"id2"</span><span style="color:#ABB2BF;">, </span><span style="color:#98C379;">"id1_filed_2"</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#E5C07B;"> tablet</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">add_value</span><span style="color:#ABB2BF;">(row, </span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">, static_cast</span><span style="color:#C678DD;"><int64_t></span><span style="color:#ABB2BF;">(row));</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Write tablet data.</span></span> |
| <span class="line"><span style="color:#E5C07B;"> writer</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">write_table</span><span style="color:#ABB2BF;">(tablet);</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Flush data</span></span> |
| <span class="line"><span style="color:#E5C07B;"> writer</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">flush</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></div><h3 id="close-file" tabindex="-1"><a class="header-anchor" href="#close-file"><span>Close File</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#E5C07B;"> writer</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">close</span><span style="color:#ABB2BF;">()</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h3 id="sample-code" tabindex="-1"><a class="header-anchor" href="#sample-code"><span>Sample Code</span></a></h3><p>The sample code of using these interfaces is in <a href="https://github.com/apache/tsfile/blob/develop/cpp/examples/cpp_examples/demo_write.cpp" target="_blank" rel="noopener noreferrer">https://github.com/apache/tsfile/blob/develop/cpp/examples/cpp_examples/demo_write.cpp</a></p><h2 id="query-process" tabindex="-1"><a class="header-anchor" href="#query-process"><span>Query Process</span></a></h2><h3 id="construct-tsfilereader" tabindex="-1"><a class="header-anchor" href="#construct-tsfilereader"><span>Construct TsFileReader</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" style="background-color:#282c34;color:#abb2bf;"><pre class="shiki one-dark-pro vp-code"><code><span class="line"><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;"> code </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> 0</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::</span><span style="color:#61AFEF;">libtsfile_init</span><span style="color:#ABB2BF;">();</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::string table_name </span><span style="color:#C678DD;">=</span><span style="color:#98C379;"> "table1"</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Create tsfile reader and open tsfile with specify path.</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::TsFileReader reader;</span></span> |
| <span class="line"><span style="color:#E5C07B;"> reader</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">open</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"test_cpp.tsfile"</span><span style="color:#ABB2BF;">);</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="construct-query-request" tabindex="-1"><a class="header-anchor" href="#construct-query-request"><span>Construct Query Request</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" 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;"> // Query data with tsfile reader.</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> storage::ResultSet</span><span style="color:#C678DD;">*</span><span style="color:#ABB2BF;"> temp_ret </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> nullptr</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::vector</span><span style="color:#C678DD;"><</span><span style="color:#ABB2BF;">std::string</span><span style="color:#C678DD;">></span><span style="color:#ABB2BF;"> columns;</span></span> |
| <span class="line"><span style="color:#E5C07B;"> columns</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">emplace_back</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"id1"</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#E5C07B;"> columns</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">emplace_back</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"id2"</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#E5C07B;"> columns</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">emplace_back</span><span style="color:#ABB2BF;">(</span><span style="color:#98C379;">"s1"</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Column vector contains the columns you want to select.</span></span> |
| <span class="line"><span style="color:#E5C07B;"> reader</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">query</span><span style="color:#ABB2BF;">(table_name, columns, </span><span style="color:#D19A66;">0</span><span style="color:#ABB2BF;">, </span><span style="color:#D19A66;">100</span><span style="color:#ABB2BF;">, temp_ret);</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></div><h3 id="query-data" tabindex="-1"><a class="header-anchor" href="#query-data"><span>Query Data</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" 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;"> // Get query handler.</span></span> |
| <span class="line"><span style="color:#C678DD;"> auto</span><span style="color:#ABB2BF;"> ret </span><span style="color:#C678DD;">=</span><span style="color:#ABB2BF;"> dynamic_cast</span><span style="color:#C678DD;"><</span><span style="color:#ABB2BF;">storage::TableResultSet</span><span style="color:#C678DD;">*></span><span style="color:#ABB2BF;">(temp_ret);</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Metadata in query handler.</span></span> |
| <span class="line"><span style="color:#C678DD;"> auto</span><span style="color:#ABB2BF;"> metadata </span><span style="color:#C678DD;">=</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">get_metadata</span><span style="color:#ABB2BF;">();</span></span> |
| <span class="line"><span style="color:#C678DD;"> int</span><span style="color:#ABB2BF;"> column_num </span><span style="color:#C678DD;">=</span><span style="color:#E5C07B;"> metadata</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">get_column_count</span><span style="color:#ABB2BF;">();</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">int</span><span style="color:#ABB2BF;"> i </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> 1</span><span style="color:#ABB2BF;">; i </span><span style="color:#C678DD;"><=</span><span style="color:#ABB2BF;"> column_num; i</span><span style="color:#C678DD;">++</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#98C379;"> "column name: "</span><span style="color:#C678DD;"> <<</span><span style="color:#E5C07B;"> metadata</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">get_column_name</span><span style="color:#ABB2BF;">(i)</span></span> |
| <span class="line"><span style="color:#C678DD;"> <<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#98C379;"> "column type: "</span></span> |
| <span class="line"><span style="color:#C678DD;"> <<</span><span style="color:#ABB2BF;"> std::</span><span style="color:#61AFEF;">to_string</span><span style="color:#ABB2BF;">(</span><span style="color:#E5C07B;">metadata</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">get_column_type</span><span style="color:#ABB2BF;">(i)) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Check and get next data.</span></span> |
| <span class="line"><span style="color:#C678DD;"> bool</span><span style="color:#ABB2BF;"> has_next </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> false</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> while</span><span style="color:#ABB2BF;"> ((code </span><span style="color:#C678DD;">=</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">next</span><span style="color:#ABB2BF;">(has_next)) </span><span style="color:#C678DD;">==</span><span style="color:#ABB2BF;"> common::E_OK </span><span style="color:#56B6C2;">&&</span><span style="color:#ABB2BF;"> has_next) {</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Timestamp at column 1 and column index begin from 1.</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> Timestamp timestamp </span><span style="color:#C678DD;">=</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><</span><span style="color:#ABB2BF;">Timestamp</span><span style="color:#C678DD;">></span><span style="color:#ABB2BF;">(</span><span style="color:#D19A66;">1</span><span style="color:#ABB2BF;">);</span></span> |
| <span class="line"><span style="color:#C678DD;"> for</span><span style="color:#ABB2BF;"> (</span><span style="color:#C678DD;">int</span><span style="color:#ABB2BF;"> i </span><span style="color:#C678DD;">=</span><span style="color:#D19A66;"> 1</span><span style="color:#ABB2BF;">; i </span><span style="color:#C678DD;"><=</span><span style="color:#ABB2BF;"> column_num; i</span><span style="color:#C678DD;">++</span><span style="color:#ABB2BF;">) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> if</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">ret</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">is_null</span><span style="color:#ABB2BF;">(i)) {</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#98C379;"> "null"</span><span style="color:#C678DD;"> <<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> } </span><span style="color:#C678DD;">else</span><span style="color:#ABB2BF;"> {</span></span> |
| <span class="line"><span style="color:#C678DD;"> switch</span><span style="color:#ABB2BF;"> (</span><span style="color:#E5C07B;">metadata</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">get_column_type</span><span style="color:#ABB2BF;">(i)) {</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::BOOLEAN:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><bool></span><span style="color:#ABB2BF;">(i) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::INT32:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><int32_t></span><span style="color:#ABB2BF;">(i) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::INT64:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><int64_t></span><span style="color:#ABB2BF;">(i) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::FLOAT:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><float></span><span style="color:#ABB2BF;">(i) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::DOUBLE:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><double></span><span style="color:#ABB2BF;">(i) </span><span style="color:#C678DD;"><<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> case</span><span style="color:#ABB2BF;"> common::STRING:</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> std::cout </span><span style="color:#C678DD;"><<</span><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#E06C75;">get_value</span><span style="color:#C678DD;"><</span><span style="color:#ABB2BF;">common::String</span><span style="color:#C678DD;">*></span><span style="color:#ABB2BF;">(i)</span></span> |
| <span class="line"><span style="color:#C678DD;"> -></span><span style="color:#61AFEF;">to_std_string</span><span style="color:#ABB2BF;">()</span></span> |
| <span class="line"><span style="color:#C678DD;"> <<</span><span style="color:#ABB2BF;"> std::endl;</span></span> |
| <span class="line"><span style="color:#C678DD;"> break</span><span style="color:#ABB2BF;">;</span></span> |
| <span class="line"><span style="color:#C678DD;"> default</span><span style="color:#ABB2BF;">:;</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span style="color:#ABB2BF;"> }</span></span> |
| <span class="line"><span 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></div><h3 id="close-file-1" tabindex="-1"><a class="header-anchor" href="#close-file-1"><span>Close File</span></a></h3><div class="language-cpp line-numbers-mode" data-highlighter="shiki" data-ext="cpp" data-title="cpp" 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;"> // Close query result set.</span></span> |
| <span class="line"><span style="color:#E5C07B;"> ret</span><span style="color:#ABB2BF;">-></span><span style="color:#61AFEF;">close</span><span style="color:#ABB2BF;">();</span></span> |
| <span class="line"><span style="color:#7F848E;font-style:italic;"> // Close reader.</span></span> |
| <span class="line"><span style="color:#E5C07B;"> reader</span><span style="color:#ABB2BF;">.</span><span style="color:#61AFEF;">close</span><span style="color:#ABB2BF;">();</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="sample-code-1" tabindex="-1"><a class="header-anchor" href="#sample-code-1"><span>Sample Code</span></a></h3><p>The sample code of using these interfaces is in <a href="https://github.com/apache/tsfile/blob/develop/cpp/examples/cpp_examples/demo_read.cpp" target="_blank" rel="noopener noreferrer">https://github.com/apache/tsfile/blob/develop/cpp/examples/cpp_examples/demo_read.cpp</a></p></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/UserGuide/latest/QuickStart/QuickStart-CPP.md" aria-label="Found Error? Edit this page on GitHub" 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><!--]-->Found Error? Edit this page on GitHub<!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">Last update: </span><span class="vp-meta-info" data-allow-mismatch="text">11/22/2025, 6:23:57 AM</span></div><!----></div></footer><nav class="vp-page-nav"><a class="route-link auto-link prev" href="/UserGuide/latest/QuickStart/QuickStart-C.html" aria-label="QuickStart-C" iconsizing="both"><div class="hint"><span class="arrow start"></span>Prev</div><div class="link"><!---->QuickStart-C</div></a><a class="route-link auto-link next" href="/UserGuide/latest/QuickStart/QuickStart.html" aria-label="QuickStart-JAVA" iconsizing="both"><div class="hint">Next<span class="arrow end"></span></div><div class="link">QuickStart-JAVA<!----></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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