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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 33.473-33.473h736.687c18.752 0 33.472 14.72 33.472 33.473a33.145 33.145 0 01-33.472 33.473z"></path></svg><span><!----></span><meta property="datePublished" content="2024-01-28T08:52:08.000Z"></span><!----><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 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 8 min</span><meta property="timeRequired" content="PT8M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="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"><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 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 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><div class="toc-wrapper"><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#how-to-use-example">How to use (Example)</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#initialization">Initialization</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#managing-session-through-sessionpool">Managing Session through SessionPool</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#create-sessionpool">Create SessionPool</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#create-a-sessionpool-using-distributed-nodes">Create a SessionPool using distributed nodes</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#acquiring-a-session-through-sessionpool-and-manually-calling-putback-after-use">Acquiring a session through SessionPool and manually calling PutBack after use</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#data-definition-interface-ddi">Data Definition Interface (DDI)</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#database-management">Database Management</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#timeseries-management">Timeseries Management</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#data-manipulation-interface-dml-interface">Data Manipulation Interface (DML Interface)</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#insert">Insert</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#insert-with-type-inference">Insert with type inference</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#insert-of-aligned-timeseries">Insert of Aligned Timeseries</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#iotdb-sql-interface">IoTDB-SQL Interface</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#schema-template">Schema Template</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#create-schema-template">Create Schema Template</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#modify-schema-template-measurements">Modify Schema Template measurements</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#set-schema-template">Set Schema Template</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#uset-schema-template">Uset Schema Template</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#show-schema-template">Show Schema Template</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#drop-schema-template">Drop Schema Template</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#pandas-support">Pandas Support</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#iotdb-testcontainer">IoTDB Testcontainer</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#iotdb-dbapi">IoTDB DBAPI</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#examples">Examples</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#iotdb-sqlalchemy-dialect-experimental">IoTDB SQLAlchemy Dialect (Experimental)</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#mapping-of-the-metadata">Mapping of the metadata</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#data-type-mapping">Data type mapping</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#example">Example</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#developers">Developers</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#introduction">Introduction</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#prerequisites">Prerequisites</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#compile-the-thrift-library-and-debug">Compile the thrift library and Debug</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#session-client-example">Session Client & Example</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#tests">Tests</a></li><!----><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#futher-tools">Futher Tools</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="toc-item"><a class="vp-link toc-link level2 toc-link level2" href="#releasing">Releasing</a></li><li><ul class="toc-list"><!--[--><li class="toc-item"><a class="vp-link toc-link level3 toc-link level3" href="#preparing-your-environment">Preparing your environment</a></li><!----><!--]--><!--[--><li 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| --><h1 id="python-native-api" tabindex="-1"><a class="header-anchor" href="#python-native-api" aria-hidden="true">#</a> Python Native API</h1><h2 id="how-to-use-example" tabindex="-1"><a class="header-anchor" href="#how-to-use-example" aria-hidden="true">#</a> How to use (Example)</h2><p>First, download the package: <code>pip3 install apache-iotdb</code></p><p>You can see an example of how to use the package to read and write data here: <a href="https://github.com/apache/iotdb/blob/master/client-py/SessionExample.py" target="_blank" rel="noopener noreferrer">Example<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><p>An example of aligned timeseries: <a href="https://github.com/apache/iotdb/blob/master/client-py/SessionAlignedTimeseriesExample.py" target="_blank" rel="noopener noreferrer">Aligned Timeseries Session Example<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><p>(you need to add <code>import iotdb</code> in the head of the file)</p><p>Or:</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> iotdb<span class="token punctuation">.</span>Session <span class="token keyword">import</span> Session |
| |
| ip <span class="token operator">=</span> <span class="token string">"127.0.0.1"</span> |
| port_ <span class="token operator">=</span> <span class="token string">"6667"</span> |
| username_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| password_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| session <span class="token operator">=</span> Session<span class="token punctuation">(</span>ip<span class="token punctuation">,</span> port_<span class="token punctuation">,</span> username_<span class="token punctuation">,</span> password_<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token builtin">open</span><span class="token punctuation">(</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| zone <span class="token operator">=</span> session<span class="token punctuation">.</span>get_time_zone<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="initialization" tabindex="-1"><a class="header-anchor" href="#initialization" aria-hidden="true">#</a> Initialization</h2><ul><li>Initialize a Session</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session <span class="token operator">=</span> Session<span class="token punctuation">(</span> |
| ip<span class="token operator">=</span><span class="token string">"127.0.0.1"</span><span class="token punctuation">,</span> |
| port<span class="token operator">=</span><span class="token string">"6667"</span><span class="token punctuation">,</span> |
| user<span class="token operator">=</span><span class="token string">"root"</span><span class="token punctuation">,</span> |
| password<span class="token operator">=</span><span class="token string">"root"</span><span class="token punctuation">,</span> |
| fetch_size<span class="token operator">=</span><span class="token number">1024</span><span class="token punctuation">,</span> |
| zone_id<span class="token operator">=</span><span class="token string">"UTC+8"</span><span class="token punctuation">,</span> |
| enable_redirection<span class="token operator">=</span><span class="token boolean">True</span> |
| <span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Initialize a Session to connect multiple nodes</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session <span class="token operator">=</span> Session<span class="token punctuation">.</span>init_from_node_urls<span class="token punctuation">(</span> |
| node_urls<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"127.0.0.1:6667"</span><span class="token punctuation">,</span> <span class="token string">"127.0.0.1:6668"</span><span class="token punctuation">,</span> <span class="token string">"127.0.0.1:6669"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| user<span class="token operator">=</span><span class="token string">"root"</span><span class="token punctuation">,</span> |
| password<span class="token operator">=</span><span class="token string">"root"</span><span class="token punctuation">,</span> |
| fetch_size<span class="token operator">=</span><span class="token number">1024</span><span class="token punctuation">,</span> |
| zone_id<span class="token operator">=</span><span class="token string">"UTC+8"</span><span class="token punctuation">,</span> |
| enable_redirection<span class="token operator">=</span><span class="token boolean">True</span> |
| <span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Open a session, with a parameter to specify whether to enable RPC compression</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span><span class="token builtin">open</span><span class="token punctuation">(</span>enable_rpc_compression<span class="token operator">=</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Notice: The RPC compression setting of the client is required to match that of the IoTDB server</p><ul><li>Close a Session</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="managing-session-through-sessionpool" tabindex="-1"><a class="header-anchor" href="#managing-session-through-sessionpool" aria-hidden="true">#</a> Managing Session through SessionPool</h2><p>Utilizing <code>SessionPool</code> to manage sessions eliminates the need to worry about session reuse.<br> When the number of session connections reaches the maximum capacity of the pool, requests for acquiring a session will block.<br> You can set a timeout after which new requests are considered unsuccessful.</p><p>After using a session, it should always be returned to the SessionPool using the <code>putBack</code> method for proper management.</p><h3 id="create-sessionpool" tabindex="-1"><a class="header-anchor" href="#create-sessionpool" aria-hidden="true">#</a> Create SessionPool</h3><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>pool_config <span class="token operator">=</span> PoolConfig<span class="token punctuation">(</span>host<span class="token operator">=</span>ip<span class="token punctuation">,</span>port<span class="token operator">=</span>port<span class="token punctuation">,</span> user_name<span class="token operator">=</span>username<span class="token punctuation">,</span> |
| password<span class="token operator">=</span>password<span class="token punctuation">,</span> fetch_size<span class="token operator">=</span><span class="token number">1024</span><span class="token punctuation">,</span> |
| time_zone<span class="token operator">=</span><span class="token string">"UTC+8"</span><span class="token punctuation">,</span> max_retry<span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">)</span> |
| max_pool_size <span class="token operator">=</span> <span class="token number">5</span> |
| wait_timeout_in_ms <span class="token operator">=</span> <span class="token number">3000</span> |
| |
| <span class="token comment"># # Create the connection pool</span> |
| session_pool <span class="token operator">=</span> SessionPool<span class="token punctuation">(</span>pool_config<span class="token punctuation">,</span> max_pool_size<span class="token punctuation">,</span> wait_timeout_in_ms<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="create-a-sessionpool-using-distributed-nodes" tabindex="-1"><a class="header-anchor" href="#create-a-sessionpool-using-distributed-nodes" aria-hidden="true">#</a> Create a SessionPool using distributed nodes</h3><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>pool_config <span class="token operator">=</span> PoolConfig<span class="token punctuation">(</span>node_urls<span class="token operator">=</span>node_urls<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"127.0.0.1:6667"</span><span class="token punctuation">,</span> <span class="token string">"127.0.0.1:6668"</span><span class="token punctuation">,</span> <span class="token string">"127.0.0.1:6669"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> user_name<span class="token operator">=</span>username<span class="token punctuation">,</span> |
| password<span class="token operator">=</span>password<span class="token punctuation">,</span> fetch_size<span class="token operator">=</span><span class="token number">1024</span><span class="token punctuation">,</span> |
| time_zone<span class="token operator">=</span><span class="token string">"UTC+8"</span><span class="token punctuation">,</span> max_retry<span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">)</span> |
| max_pool_size <span class="token operator">=</span> <span class="token number">5</span> |
| wait_timeout_in_ms <span class="token operator">=</span> <span class="token number">3000</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="acquiring-a-session-through-sessionpool-and-manually-calling-putback-after-use" tabindex="-1"><a class="header-anchor" href="#acquiring-a-session-through-sessionpool-and-manually-calling-putback-after-use" aria-hidden="true">#</a> Acquiring a session through SessionPool and manually calling PutBack after use</h3><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session <span class="token operator">=</span> session_pool<span class="token punctuation">.</span>get_session<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>set_storage_group<span class="token punctuation">(</span>STORAGE_GROUP_NAME<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>create_time_series<span class="token punctuation">(</span> |
| TIMESERIES_PATH<span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>BOOLEAN<span class="token punctuation">,</span> TSEncoding<span class="token punctuation">.</span>PLAIN<span class="token punctuation">,</span> Compressor<span class="token punctuation">.</span>SNAPPY |
| <span class="token punctuation">)</span> |
| <span class="token comment"># After usage, return the session using putBack</span> |
| session_pool<span class="token punctuation">.</span>put_back<span class="token punctuation">(</span>session<span class="token punctuation">)</span> |
| <span class="token comment"># When closing the sessionPool, all managed sessions will be closed as well</span> |
| session_pool<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="data-definition-interface-ddi" tabindex="-1"><a class="header-anchor" href="#data-definition-interface-ddi" aria-hidden="true">#</a> Data Definition Interface (DDI)</h2><h3 id="database-management" tabindex="-1"><a class="header-anchor" href="#database-management" aria-hidden="true">#</a> Database Management</h3><ul><li>CREATE DATABASE</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>set_storage_group<span class="token punctuation">(</span>group_name<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Delete one or several databases</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>delete_storage_group<span class="token punctuation">(</span>group_name<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>delete_storage_groups<span class="token punctuation">(</span>group_name_lst<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="timeseries-management" tabindex="-1"><a class="header-anchor" href="#timeseries-management" aria-hidden="true">#</a> Timeseries Management</h3><ul><li>Create one or multiple timeseries</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>create_time_series<span class="token punctuation">(</span>ts_path<span class="token punctuation">,</span> data_type<span class="token punctuation">,</span> encoding<span class="token punctuation">,</span> compressor<span class="token punctuation">,</span> |
| props<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> tags<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> attributes<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> alias<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">)</span> |
| |
| session<span class="token punctuation">.</span>create_multi_time_series<span class="token punctuation">(</span> |
| ts_path_lst<span class="token punctuation">,</span> data_type_lst<span class="token punctuation">,</span> encoding_lst<span class="token punctuation">,</span> compressor_lst<span class="token punctuation">,</span> |
| props_lst<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> tags_lst<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> attributes_lst<span class="token operator">=</span><span class="token boolean">None</span><span class="token punctuation">,</span> alias_lst<span class="token operator">=</span><span class="token boolean">None</span> |
| <span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Create aligned timeseries</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>create_aligned_time_series<span class="token punctuation">(</span> |
| device_id<span class="token punctuation">,</span> measurements_lst<span class="token punctuation">,</span> data_type_lst<span class="token punctuation">,</span> encoding_lst<span class="token punctuation">,</span> compressor_lst |
| <span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Attention: Alias of measurements are <strong>not supported</strong> currently.</p><ul><li>Delete one or several timeseries</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>delete_time_series<span class="token punctuation">(</span>paths_list<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Check whether the specific timeseries exists</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>check_time_series_exists<span class="token punctuation">(</span>path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="data-manipulation-interface-dml-interface" tabindex="-1"><a class="header-anchor" href="#data-manipulation-interface-dml-interface" aria-hidden="true">#</a> Data Manipulation Interface (DML Interface)</h2><h3 id="insert" tabindex="-1"><a class="header-anchor" href="#insert" aria-hidden="true">#</a> Insert</h3><p>It is recommended to use <code>insertTablet</code> to help improve write efficiency.</p><ul><li>Insert a Tablet，which is multiple rows of data for one device, each row has the same measurements <ul><li><strong>Better Write Performance</strong></li><li><strong>Support null values</strong>: fill the null value with any value, and then mark the null value via BitMap (from v0.13)</li></ul></li></ul><p>We have two implementations of Tablet in Python API.</p><ul><li>Normal Tablet</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>values_ <span class="token operator">=</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">[</span><span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">1.1</span><span class="token punctuation">,</span> <span class="token number">10011.1</span><span class="token punctuation">,</span> <span class="token string">"test01"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">11111</span><span class="token punctuation">,</span> <span class="token number">1.25</span><span class="token punctuation">,</span> <span class="token number">101.0</span><span class="token punctuation">,</span> <span class="token string">"test02"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">188.1</span><span class="token punctuation">,</span> <span class="token number">688.25</span><span class="token punctuation">,</span> <span class="token string">"test03"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">6.25</span><span class="token punctuation">,</span> <span class="token string">"test04"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| timestamps_ <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]</span> |
| tablet_ <span class="token operator">=</span> Tablet<span class="token punctuation">(</span> |
| device_id<span class="token punctuation">,</span> measurements_<span class="token punctuation">,</span> data_types_<span class="token punctuation">,</span> values_<span class="token punctuation">,</span> timestamps_ |
| <span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>insert_tablet<span class="token punctuation">(</span>tablet_<span class="token punctuation">)</span> |
| |
| values_ <span class="token operator">=</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">[</span><span class="token boolean">None</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">1.1</span><span class="token punctuation">,</span> <span class="token number">10011.1</span><span class="token punctuation">,</span> <span class="token string">"test01"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token boolean">None</span><span class="token punctuation">,</span> <span class="token number">11111</span><span class="token punctuation">,</span> <span class="token number">1.25</span><span class="token punctuation">,</span> <span class="token number">101.0</span><span class="token punctuation">,</span> <span class="token string">"test02"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token boolean">None</span><span class="token punctuation">,</span> <span class="token number">188.1</span><span class="token punctuation">,</span> <span class="token number">688.25</span><span class="token punctuation">,</span> <span class="token string">"test03"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">[</span><span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token boolean">None</span><span class="token punctuation">,</span> <span class="token boolean">None</span><span class="token punctuation">]</span><span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| timestamps_ <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">16</span><span class="token punctuation">,</span> <span class="token number">17</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">19</span><span class="token punctuation">]</span> |
| tablet_ <span class="token operator">=</span> Tablet<span class="token punctuation">(</span> |
| device_id<span class="token punctuation">,</span> measurements_<span class="token punctuation">,</span> data_types_<span class="token punctuation">,</span> values_<span class="token punctuation">,</span> timestamps_ |
| <span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>insert_tablet<span class="token punctuation">(</span>tablet_<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Numpy Tablet</li></ul><p>Comparing with Tablet, Numpy Tablet is using <a href="https://numpy.org/doc/stable/reference/generated/numpy.ndarray.html" target="_blank" rel="noopener noreferrer">numpy.ndarray<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> to record data.<br> With less memory footprint and time cost of serialization, therefore the insert performance will be better.</p><p><strong>Notice</strong></p><ol><li>time and numerical value columns in Tablet is <code>ndarray</code></li><li>recommended to use the specific <code>dtypes</code> to each <code>ndarray</code>, see the example below<br> (if not, the default <code>dtypes</code> are also ok).</li></ol><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">import</span> numpy <span class="token keyword">as</span> np |
| data_types_ <span class="token operator">=</span> <span class="token punctuation">[</span> |
| TSDataType<span class="token punctuation">.</span>BOOLEAN<span class="token punctuation">,</span> |
| TSDataType<span class="token punctuation">.</span>INT32<span class="token punctuation">,</span> |
| TSDataType<span class="token punctuation">.</span>INT64<span class="token punctuation">,</span> |
| TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> |
| TSDataType<span class="token punctuation">.</span>DOUBLE<span class="token punctuation">,</span> |
| TSDataType<span class="token punctuation">.</span>TEXT<span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| np_values_ <span class="token operator">=</span> <span class="token punctuation">[</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token boolean">True</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>BOOLEAN<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT32<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">11111</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT64<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1.1</span><span class="token punctuation">,</span> <span class="token number">1.25</span><span class="token punctuation">,</span> <span class="token number">188.1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">10011.1</span><span class="token punctuation">,</span> <span class="token number">101.0</span><span class="token punctuation">,</span> <span class="token number">688.25</span><span class="token punctuation">,</span> <span class="token number">6.25</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>DOUBLE<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">"test01"</span><span class="token punctuation">,</span> <span class="token string">"test02"</span><span class="token punctuation">,</span> <span class="token string">"test03"</span><span class="token punctuation">,</span> <span class="token string">"test04"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>TEXT<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| np_timestamps_ <span class="token operator">=</span> np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT64<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> |
| np_tablet_ <span class="token operator">=</span> NumpyTablet<span class="token punctuation">(</span> |
| device_id<span class="token punctuation">,</span> measurements_<span class="token punctuation">,</span> data_types_<span class="token punctuation">,</span> np_values_<span class="token punctuation">,</span> np_timestamps_ |
| <span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>insert_tablet<span class="token punctuation">(</span>np_tablet_<span class="token punctuation">)</span> |
| |
| <span class="token comment"># insert one numpy tablet with None into the database.</span> |
| np_values_ <span class="token operator">=</span> <span class="token punctuation">[</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token boolean">True</span><span class="token punctuation">,</span> <span class="token boolean">False</span><span class="token punctuation">,</span> <span class="token boolean">True</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>BOOLEAN<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT32<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">11111</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT64<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1.1</span><span class="token punctuation">,</span> <span class="token number">1.25</span><span class="token punctuation">,</span> <span class="token number">188.1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">10011.1</span><span class="token punctuation">,</span> <span class="token number">101.0</span><span class="token punctuation">,</span> <span class="token number">688.25</span><span class="token punctuation">,</span> <span class="token number">6.25</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>DOUBLE<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">"test01"</span><span class="token punctuation">,</span> <span class="token string">"test02"</span><span class="token punctuation">,</span> <span class="token string">"test03"</span><span class="token punctuation">,</span> <span class="token string">"test04"</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>TEXT<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| np_timestamps_ <span class="token operator">=</span> np<span class="token punctuation">.</span>array<span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">98</span><span class="token punctuation">,</span> <span class="token number">99</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">101</span><span class="token punctuation">]</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>INT64<span class="token punctuation">.</span>np_dtype<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> |
| np_bitmaps_ <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span> |
| <span class="token keyword">for</span> i <span class="token keyword">in</span> <span class="token builtin">range</span><span class="token punctuation">(</span><span class="token builtin">len</span><span class="token punctuation">(</span>measurements_<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">:</span> |
| np_bitmaps_<span class="token punctuation">.</span>append<span class="token punctuation">(</span>BitMap<span class="token punctuation">(</span><span class="token builtin">len</span><span class="token punctuation">(</span>np_timestamps_<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> |
| np_bitmaps_<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>mark<span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span> |
| np_bitmaps_<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>mark<span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> |
| np_bitmaps_<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">.</span>mark<span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span> |
| np_bitmaps_<span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">.</span>mark<span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span> |
| np_bitmaps_<span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">.</span>mark<span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span> |
| np_tablet_with_none <span class="token operator">=</span> NumpyTablet<span class="token punctuation">(</span> |
| device_id<span class="token punctuation">,</span> measurements_<span class="token punctuation">,</span> data_types_<span class="token punctuation">,</span> np_values_<span class="token punctuation">,</span> np_timestamps_<span class="token punctuation">,</span> np_bitmaps_ |
| <span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>insert_tablet<span class="token punctuation">(</span>np_tablet_with_none<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Insert multiple Tablets</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>insert_tablets<span class="token punctuation">(</span>tablet_lst<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Insert a Record</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>insert_record<span class="token punctuation">(</span>device_id<span class="token punctuation">,</span> timestamp<span class="token punctuation">,</span> measurements_<span class="token punctuation">,</span> data_types_<span class="token punctuation">,</span> values_<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Insert multiple Records</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>insert_records<span class="token punctuation">(</span> |
| device_ids_<span class="token punctuation">,</span> time_list_<span class="token punctuation">,</span> measurements_list_<span class="token punctuation">,</span> data_type_list_<span class="token punctuation">,</span> values_list_ |
| <span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>Insert multiple Records that belong to the same device.<br> With type info the server has no need to do type inference, which results in a better performance.</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>insert_records_of_one_device<span class="token punctuation">(</span>device_id<span class="token punctuation">,</span> time_list<span class="token punctuation">,</span> measurements_list<span class="token punctuation">,</span> data_types_list<span class="token punctuation">,</span> values_list<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="insert-with-type-inference" tabindex="-1"><a class="header-anchor" href="#insert-with-type-inference" aria-hidden="true">#</a> Insert with type inference</h3><p>If type-information is not present, all values will be converted to their <code>String</code> representation.<br> The server then performs type inference to guess the datatype, based on this string-representation.<br> For example, if value string equals "true", it can be automatically inferred to be a <code>Boolean</code> type. If string value is "3.2", it can be automatically inferred as a <code>Float</code> type.<br> However, please keep in mind, that this process of guessing the type for a given value comes at a performance cost.</p><ul><li>Insert a Record, which contains multiple measurement value of a device at a timestamp</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>insert_str_record<span class="token punctuation">(</span>device_id<span class="token punctuation">,</span> timestamp<span class="token punctuation">,</span> measurements<span class="token punctuation">,</span> string_values<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="insert-of-aligned-timeseries" tabindex="-1"><a class="header-anchor" href="#insert-of-aligned-timeseries" aria-hidden="true">#</a> Insert of Aligned Timeseries</h3><p>The insertion of aligned timeseries uses interfaces such as <code>insert_aligned_XXX</code>, and others are similar to the above interfaces:</p><ul><li>insert_aligned_record</li><li>insert_aligned_records</li><li>insert_aligned_records_of_one_device</li><li>insert_aligned_tablet</li><li>insert_aligned_tablets</li></ul><h2 id="iotdb-sql-interface" tabindex="-1"><a class="header-anchor" href="#iotdb-sql-interface" aria-hidden="true">#</a> IoTDB-SQL Interface</h2><ul><li>Execute query statement</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>execute_query_statement<span class="token punctuation">(</span>sql<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Execute non-query statement</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>execute_non_query_statement<span class="token punctuation">(</span>sql<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Execute statement</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>execute_statement<span class="token punctuation">(</span>sql<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="schema-template" tabindex="-1"><a class="header-anchor" href="#schema-template" aria-hidden="true">#</a> Schema Template</h2><h3 id="create-schema-template" tabindex="-1"><a class="header-anchor" href="#create-schema-template" aria-hidden="true">#</a> Create Schema Template</h3><p>The process of creating a schema template is as follows</p><ol><li>Create the template class</li><li>Adding MeasurementNode</li><li>Execute create schema template function</li></ol><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>template <span class="token operator">=</span> Template<span class="token punctuation">(</span>name<span class="token operator">=</span>template_name<span class="token punctuation">,</span> share_time<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span> |
| |
| m_node_x <span class="token operator">=</span> MeasurementNode<span class="token punctuation">(</span><span class="token string">"x"</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> TSEncoding<span class="token punctuation">.</span>RLE<span class="token punctuation">,</span> Compressor<span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span> |
| m_node_y <span class="token operator">=</span> MeasurementNode<span class="token punctuation">(</span><span class="token string">"y"</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> TSEncoding<span class="token punctuation">.</span>RLE<span class="token punctuation">,</span> Compressor<span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span> |
| m_node_z <span class="token operator">=</span> MeasurementNode<span class="token punctuation">(</span><span class="token string">"z"</span><span class="token punctuation">,</span> TSDataType<span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> TSEncoding<span class="token punctuation">.</span>RLE<span class="token punctuation">,</span> Compressor<span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span> |
| |
| template<span class="token punctuation">.</span>add_template<span class="token punctuation">(</span>m_node_x<span class="token punctuation">)</span> |
| template<span class="token punctuation">.</span>add_template<span class="token punctuation">(</span>m_node_y<span class="token punctuation">)</span> |
| template<span class="token punctuation">.</span>add_template<span class="token punctuation">(</span>m_node_z<span class="token punctuation">)</span> |
| |
| session<span class="token punctuation">.</span>create_schema_template<span class="token punctuation">(</span>template<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="modify-schema-template-measurements" tabindex="-1"><a class="header-anchor" href="#modify-schema-template-measurements" aria-hidden="true">#</a> Modify Schema Template measurements</h3><p>Modify measurements in a template, the template must be already created. These are functions that add or delete some measurement nodes.</p><ul><li>add node in template</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>add_measurements_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> measurements_path<span class="token punctuation">,</span> data_types<span class="token punctuation">,</span> encodings<span class="token punctuation">,</span> compressors<span class="token punctuation">,</span> is_aligned<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>delete node in template</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>delete_node_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="set-schema-template" tabindex="-1"><a class="header-anchor" href="#set-schema-template" aria-hidden="true">#</a> Set Schema Template</h3><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>set_schema_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> prefix_path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="uset-schema-template" tabindex="-1"><a class="header-anchor" href="#uset-schema-template" aria-hidden="true">#</a> Uset Schema Template</h3><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>unset_schema_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> prefix_path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="show-schema-template" tabindex="-1"><a class="header-anchor" href="#show-schema-template" aria-hidden="true">#</a> Show Schema Template</h3><ul><li>Show all schema templates</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>show_all_templates<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Count all measurements in templates</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>count_measurements_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Judge whether the path is measurement or not in templates, This measurement must be in the template</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>count_measurements_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Judge whether the path is exist or not in templates, This path may not belong to the template</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>is_path_exist_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">,</span> path<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Show nodes under in schema template</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>show_measurements_in_template<span class="token punctuation">(</span>template_name<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Show the path prefix where a schema template is set</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>show_paths_template_set_on<span class="token punctuation">(</span>template_name<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>Show the path prefix where a schema template is used (i.e. the time series has been created)</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>show_paths_template_using_on<span class="token punctuation">(</span>template_name<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="drop-schema-template" tabindex="-1"><a class="header-anchor" href="#drop-schema-template" aria-hidden="true">#</a> Drop Schema Template</h3><p>Delete an existing schema template，dropping an already set template is not supported</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>session<span class="token punctuation">.</span>drop_schema_template<span class="token punctuation">(</span><span class="token string">"template_python"</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="pandas-support" tabindex="-1"><a class="header-anchor" href="#pandas-support" aria-hidden="true">#</a> Pandas Support</h2><p>To easily transform a query result to a <a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.html" target="_blank" rel="noopener noreferrer">Pandas Dataframe<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> the <code>SessionDataSet</code> has a method <code>.todf()</code> which consumes the dataset and transforms it to a pandas dataframe.</p><p>Example:</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> iotdb<span class="token punctuation">.</span>Session <span class="token keyword">import</span> Session |
| |
| ip <span class="token operator">=</span> <span class="token string">"127.0.0.1"</span> |
| port_ <span class="token operator">=</span> <span class="token string">"6667"</span> |
| username_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| password_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| session <span class="token operator">=</span> Session<span class="token punctuation">(</span>ip<span class="token punctuation">,</span> port_<span class="token punctuation">,</span> username_<span class="token punctuation">,</span> password_<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token builtin">open</span><span class="token punctuation">(</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| result <span class="token operator">=</span> session<span class="token punctuation">.</span>execute_query_statement<span class="token punctuation">(</span><span class="token string">"SELECT * FROM root.*"</span><span class="token punctuation">)</span> |
| |
| <span class="token comment"># Transform to Pandas Dataset</span> |
| df <span class="token operator">=</span> result<span class="token punctuation">.</span>todf<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| |
| session<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| |
| <span class="token comment"># Now you can work with the dataframe</span> |
| df <span class="token operator">=</span> <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="iotdb-testcontainer" tabindex="-1"><a class="header-anchor" href="#iotdb-testcontainer" aria-hidden="true">#</a> IoTDB Testcontainer</h2><p>The Test Support is based on the lib <code>testcontainers</code> (<a href="https://testcontainers-python.readthedocs.io/en/latest/index.html" target="_blank" rel="noopener noreferrer">https://testcontainers-python.readthedocs.io/en/latest/index.html<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>) which you need to install in your project if you want to use this feature.</p><p>To start (and stop) an IoTDB Database in a Docker container simply do:</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">class</span> <span class="token class-name">MyTestCase</span><span class="token punctuation">(</span>unittest<span class="token punctuation">.</span>TestCase<span class="token punctuation">)</span><span class="token punctuation">:</span> |
| |
| <span class="token keyword">def</span> <span class="token function">test_something</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span> |
| <span class="token keyword">with</span> IoTDBContainer<span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">as</span> c<span class="token punctuation">:</span> |
| session <span class="token operator">=</span> Session<span class="token punctuation">(</span><span class="token string">"localhost"</span><span class="token punctuation">,</span> c<span class="token punctuation">.</span>get_exposed_port<span class="token punctuation">(</span><span class="token number">6667</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">"root"</span><span class="token punctuation">,</span> <span class="token string">"root"</span><span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token builtin">open</span><span class="token punctuation">(</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| result <span class="token operator">=</span> session<span class="token punctuation">.</span>execute_query_statement<span class="token punctuation">(</span><span class="token string">"SHOW TIMESERIES"</span><span class="token punctuation">)</span> |
| <span class="token keyword">print</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Per default, it will load the image <code>apache/iotdb:latest</code>, if you want a specific version just pass it like e.g. <code>IoTDBContainer("apache/iotdb:0.12.0")</code> to get version <code>0.12.0</code>.</p><h2 id="iotdb-dbapi" tabindex="-1"><a class="header-anchor" href="#iotdb-dbapi" aria-hidden="true">#</a> IoTDB DBAPI</h2><p>IoTDB DBAPI implements the <code>Python DB API 2.0</code> specification (<a href="https://peps.python.org/pep-0249/" target="_blank" rel="noopener noreferrer">https://peps.python.org/pep-0249/<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>), which defines a common interface for accessing databases in Python.</p><h3 id="examples" tabindex="-1"><a class="header-anchor" href="#examples" aria-hidden="true">#</a> Examples</h3><ul><li>Initialization</li></ul><p>The initialization parameters are consistent with the session part (except for the sqlalchemy_mode).</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> iotdb<span class="token punctuation">.</span>dbapi <span class="token keyword">import</span> connect |
| |
| ip <span class="token operator">=</span> <span class="token string">"127.0.0.1"</span> |
| port_ <span class="token operator">=</span> <span class="token string">"6667"</span> |
| username_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| password_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| conn <span class="token operator">=</span> connect<span class="token punctuation">(</span>ip<span class="token punctuation">,</span> port_<span class="token punctuation">,</span> username_<span class="token punctuation">,</span> password_<span class="token punctuation">,</span>fetch_size<span class="token operator">=</span><span class="token number">1024</span><span class="token punctuation">,</span>zone_id<span class="token operator">=</span><span class="token string">"UTC+8"</span><span class="token punctuation">,</span>sqlalchemy_mode<span class="token operator">=</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| cursor <span class="token operator">=</span> conn<span class="token punctuation">.</span>cursor<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>simple SQL statement execution</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>cursor<span class="token punctuation">.</span>execute<span class="token punctuation">(</span><span class="token string">"SELECT ** FROM root"</span><span class="token punctuation">)</span> |
| <span class="token keyword">for</span> row <span class="token keyword">in</span> cursor<span class="token punctuation">.</span>fetchall<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span> |
| <span class="token keyword">print</span><span class="token punctuation">(</span>row<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>execute SQL with parameter</li></ul><p>IoTDB DBAPI supports <code>pyformat</code> style parameters</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>cursor<span class="token punctuation">.</span>execute<span class="token punctuation">(</span><span class="token string">"SELECT ** FROM root WHERE time < %(time)s"</span><span class="token punctuation">,</span><span class="token punctuation">{</span><span class="token string">"time"</span><span class="token punctuation">:</span><span class="token string">"2017-11-01T00:08:00.000"</span><span class="token punctuation">}</span><span class="token punctuation">)</span> |
| <span class="token keyword">for</span> row <span class="token keyword">in</span> cursor<span class="token punctuation">.</span>fetchall<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span> |
| <span class="token keyword">print</span><span class="token punctuation">(</span>row<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>execute SQL with parameter sequences</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>seq_of_parameters <span class="token operator">=</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">{</span><span class="token string">"timestamp"</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">"temperature"</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token punctuation">{</span><span class="token string">"timestamp"</span><span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token string">"temperature"</span><span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token punctuation">{</span><span class="token string">"timestamp"</span><span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token string">"temperature"</span><span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token punctuation">{</span><span class="token string">"timestamp"</span><span class="token punctuation">:</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token string">"temperature"</span><span class="token punctuation">:</span> <span class="token number">4</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token punctuation">{</span><span class="token string">"timestamp"</span><span class="token punctuation">:</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token string">"temperature"</span><span class="token punctuation">:</span> <span class="token number">5</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token punctuation">]</span> |
| sql <span class="token operator">=</span> <span class="token string">"insert into root.cursor(timestamp,temperature) values(%(timestamp)s,%(temperature)s)"</span> |
| cursor<span class="token punctuation">.</span>executemany<span class="token punctuation">(</span>sql<span class="token punctuation">,</span>seq_of_parameters<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>close the connection and cursor</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code>cursor<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| conn<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="iotdb-sqlalchemy-dialect-experimental" tabindex="-1"><a class="header-anchor" href="#iotdb-sqlalchemy-dialect-experimental" aria-hidden="true">#</a> IoTDB SQLAlchemy Dialect (Experimental)</h2><p>The <code>SQLAlchemy</code> dialect of IoTDB is written to adapt to <code>Apache Superset</code>.</p><p>This part is still being improved.</p><p>Please do not use it in production environments!</p><h3 id="mapping-of-the-metadata" tabindex="-1"><a class="header-anchor" href="#mapping-of-the-metadata" aria-hidden="true">#</a> Mapping of the metadata</h3><p>The data model used by <code>SQLAlchemy</code> is a relational data model, which describes the relationships between different entities through tables.<br> In contrast to that the data model of IoTDB is a hierarchical data model, which organizes the data through a tree structure.</p><p>In order to adapt IoTDB to the dialect of SQLAlchemy, the original data model in IoTDB needs to be reorganized.</p><p>Converting the data model of IoTDB into the data model of SQLAlchemy.</p><p>The metadata in the IoTDB are：</p><ol><li>Database</li><li>Path</li><li>Entity</li><li>Measurement</li></ol><p>The metadata in the SQLAlchemy are：</p><ol><li>Schema</li><li>Table</li><li>Column</li></ol><p>The mapping relationship between them is：</p><table><thead><tr><th>The metadata in the SQLAlchemy</th><th>The metadata in the IoTDB</th></tr></thead><tbody><tr><td>Schema</td><td>Database</td></tr><tr><td>Table</td><td>Path ( from database to entity ) + Entity</td></tr><tr><td>Column</td><td>Measurement</td></tr></tbody></table><p>The following figure shows the relationship between the two more intuitively:</p><figure><img src="https://alioss.timecho.com/docs/img/UserGuide/API/IoTDB-SQLAlchemy/sqlalchemy-to-iotdb.png?raw=true" alt="sqlalchemy-to-iotdb" tabindex="0" loading="lazy"><figcaption>sqlalchemy-to-iotdb</figcaption></figure><h3 id="data-type-mapping" tabindex="-1"><a class="header-anchor" href="#data-type-mapping" aria-hidden="true">#</a> Data type mapping</h3><table><thead><tr><th>data type in IoTDB</th><th>data type in SQLAlchemy</th></tr></thead><tbody><tr><td>BOOLEAN</td><td>Boolean</td></tr><tr><td>INT32</td><td>Integer</td></tr><tr><td>INT64</td><td>BigInteger</td></tr><tr><td>FLOAT</td><td>Float</td></tr><tr><td>DOUBLE</td><td>Float</td></tr><tr><td>TEXT</td><td>Text</td></tr><tr><td>LONG</td><td>BigInteger</td></tr></tbody></table><h3 id="example" tabindex="-1"><a class="header-anchor" href="#example" aria-hidden="true">#</a> Example</h3><ul><li>execute statement</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> sqlalchemy <span class="token keyword">import</span> create_engine |
| |
| engine <span class="token operator">=</span> create_engine<span class="token punctuation">(</span><span class="token string">"iotdb://root:root@127.0.0.1:6667"</span><span class="token punctuation">)</span> |
| connect <span class="token operator">=</span> engine<span class="token punctuation">.</span>connect<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| result <span class="token operator">=</span> connect<span class="token punctuation">.</span>execute<span class="token punctuation">(</span><span class="token string">"SELECT ** FROM root"</span><span class="token punctuation">)</span> |
| <span class="token keyword">for</span> row <span class="token keyword">in</span> result<span class="token punctuation">.</span>fetchall<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span> |
| <span class="token keyword">print</span><span class="token punctuation">(</span>row<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>ORM (now only simple queries are supported)</li></ul><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> sqlalchemy <span class="token keyword">import</span> create_engine<span class="token punctuation">,</span> Column<span class="token punctuation">,</span> Float<span class="token punctuation">,</span> BigInteger<span class="token punctuation">,</span> MetaData |
| <span class="token keyword">from</span> sqlalchemy<span class="token punctuation">.</span>ext<span class="token punctuation">.</span>declarative <span class="token keyword">import</span> declarative_base |
| <span class="token keyword">from</span> sqlalchemy<span class="token punctuation">.</span>orm <span class="token keyword">import</span> sessionmaker |
| |
| metadata <span class="token operator">=</span> MetaData<span class="token punctuation">(</span> |
| schema<span class="token operator">=</span><span class="token string">'root.factory'</span> |
| <span class="token punctuation">)</span> |
| Base <span class="token operator">=</span> declarative_base<span class="token punctuation">(</span>metadata<span class="token operator">=</span>metadata<span class="token punctuation">)</span> |
| |
| |
| <span class="token keyword">class</span> <span class="token class-name">Device</span><span class="token punctuation">(</span>Base<span class="token punctuation">)</span><span class="token punctuation">:</span> |
| __tablename__ <span class="token operator">=</span> <span class="token string">"room2.device1"</span> |
| Time <span class="token operator">=</span> Column<span class="token punctuation">(</span>BigInteger<span class="token punctuation">,</span> primary_key<span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation">)</span> |
| temperature <span class="token operator">=</span> Column<span class="token punctuation">(</span>Float<span class="token punctuation">)</span> |
| status <span class="token operator">=</span> Column<span class="token punctuation">(</span>Float<span class="token punctuation">)</span> |
| |
| |
| engine <span class="token operator">=</span> create_engine<span class="token punctuation">(</span><span class="token string">"iotdb://root:root@127.0.0.1:6667"</span><span class="token punctuation">)</span> |
| |
| DbSession <span class="token operator">=</span> sessionmaker<span class="token punctuation">(</span>bind<span class="token operator">=</span>engine<span class="token punctuation">)</span> |
| session <span class="token operator">=</span> DbSession<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| |
| res <span class="token operator">=</span> session<span class="token punctuation">.</span>query<span class="token punctuation">(</span>Device<span class="token punctuation">.</span>status<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token builtin">filter</span><span class="token punctuation">(</span>Device<span class="token punctuation">.</span>temperature <span class="token operator">></span> <span class="token number">1</span><span class="token punctuation">)</span> |
| |
| <span class="token keyword">for</span> row <span class="token keyword">in</span> res<span class="token punctuation">:</span> |
| <span class="token keyword">print</span><span class="token punctuation">(</span>row<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="developers" tabindex="-1"><a class="header-anchor" href="#developers" aria-hidden="true">#</a> Developers</h2><h3 id="introduction" tabindex="-1"><a class="header-anchor" href="#introduction" aria-hidden="true">#</a> Introduction</h3><p>This is an example of how to connect to IoTDB with python, using the thrift rpc interfaces.<br> Things are almost the same on Windows or Linux, but pay attention to the difference like path separator.</p><h3 id="prerequisites" tabindex="-1"><a class="header-anchor" href="#prerequisites" aria-hidden="true">#</a> Prerequisites</h3><p>Python3.7 or later is preferred.</p><p>Before starting you need to install <code>requirements_dev.txt</code> in your python environment, e.g. by calling</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>pip <span class="token function">install</span> <span class="token parameter variable">-r</span> requirements_dev.txt |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="compile-the-thrift-library-and-debug" tabindex="-1"><a class="header-anchor" href="#compile-the-thrift-library-and-debug" aria-hidden="true">#</a> Compile the thrift library and Debug</h3><p>In the root of IoTDB´s source code folder, run <code>mvn clean generate-sources -pl iotdb-client/client-py -am</code>.</p><p>This will automatically delete and repopulate the folder <code>iotdb/thrift</code> with the generated thrift files.<br> This folder is ignored from git and should <strong>never be pushed to git!</strong></p><h3 id="session-client-example" tabindex="-1"><a class="header-anchor" href="#session-client-example" aria-hidden="true">#</a> Session Client & Example</h3><p>The IoTDB session-interface is available in <code>client-py/src/iotdb/Session.py</code> (similar to its Java counterpart).<br> We also provide an example in <code>client-py/src/SessionExample.py</code> which demonstrates how to use the session module.</p><p>Or, another simple example:</p><div class="language-python line-numbers-mode" data-ext="py"><pre class="language-python"><code><span class="token keyword">from</span> iotdb<span class="token punctuation">.</span>Session <span class="token keyword">import</span> Session |
| |
| ip <span class="token operator">=</span> <span class="token string">"127.0.0.1"</span> |
| port_ <span class="token operator">=</span> <span class="token string">"6667"</span> |
| username_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| password_ <span class="token operator">=</span> <span class="token string">"root"</span> |
| session <span class="token operator">=</span> Session<span class="token punctuation">(</span>ip<span class="token punctuation">,</span> port_<span class="token punctuation">,</span> username_<span class="token punctuation">,</span> password_<span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span><span class="token builtin">open</span><span class="token punctuation">(</span><span class="token boolean">False</span><span class="token punctuation">)</span> |
| zone <span class="token operator">=</span> session<span class="token punctuation">.</span>get_time_zone<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| session<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="tests" tabindex="-1"><a class="header-anchor" href="#tests" aria-hidden="true">#</a> Tests</h3><p>Please add your custom tests in <code>tests</code> folder.</p><p>To run all defined tests just type <code>pytest .</code> in the root folder.</p><p><strong>Notice</strong> Some tests need docker to be started on your system as a test instance is started in a docker container using <a href="https://testcontainers-python.readthedocs.io/en/latest/index.html" target="_blank" rel="noopener noreferrer">testcontainers<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>.</p><h3 id="futher-tools" tabindex="-1"><a class="header-anchor" href="#futher-tools" aria-hidden="true">#</a> Futher Tools</h3><p><a href="https://pypi.org/project/black/" target="_blank" rel="noopener noreferrer">black<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> and <a href="https://pypi.org/project/flake8/" target="_blank" rel="noopener noreferrer">flake8<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> are installed for autoformatting and linting.<br> Both can be run by <code>black .</code> or <code>flake8 .</code> respectively.</p><h2 id="releasing" tabindex="-1"><a class="header-anchor" href="#releasing" aria-hidden="true">#</a> Releasing</h2><p>To do a release just ensure that you have the right set of generated thrift files.<br> Then run <code>linting</code> and <code>auto-formatting</code>.<br> Then, ensure that all tests work (via <code>pytest .</code>).<br> Then you are good to go to do a release!</p><h3 id="preparing-your-environment" tabindex="-1"><a class="header-anchor" href="#preparing-your-environment" aria-hidden="true">#</a> Preparing your environment</h3><p>First, install all necessary dev dependencies via <code>pip install -r requirements_dev.txt</code>.</p><h3 id="doing-the-release" tabindex="-1"><a class="header-anchor" href="#doing-the-release" aria-hidden="true">#</a> Doing the Release</h3><p>There is a convenient script <code>release.sh</code> to do all steps for a release.<br> Namely, these are</p><ul><li>Remove all transient directories from last release (if exists)</li><li>(Re-)generate all generated sources via mvn</li><li>Run Linting (flake8)</li><li>Run Tests via pytest</li><li>Build</li><li>Release to pypi</li></ul></div><!--[--><!----><!--]--><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/UserGuide/Master/API/Programming-Python-Native-API.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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