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end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">应用编程接口</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable active"><!----><span class="title">元数据操作</span><span class="arrow down"></span></button><ul class="sidebar-links"><li><!--[--><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/Storage-Group.html" class="nav-link sidebar-link sidebar-page" aria-label="存储组操作"><!---->存储组操作<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/Node.html" class="nav-link sidebar-link sidebar-page" aria-label="节点操作"><!---->节点操作<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/Timeseries.html" class="nav-link sidebar-link sidebar-page" aria-label="时间序列操作"><!---->时间序列操作<!----></a><ul 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nav-link sidebar-link heading" aria-label="卸载元数据模板"><!---->卸载元数据模板<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#删除元数据模板" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="删除元数据模板"><!---->删除元数据模板<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/TTL.html" class="nav-link sidebar-link sidebar-page" aria-label="TTL"><!---->TTL<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/Auto-Create-MetaData.html" class="nav-link sidebar-link sidebar-page" aria-label="自动创建元数据"><!---->自动创建元数据<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li></ul></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">数据写入和删除</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">数据查询</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">数据处理</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">权限管理</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">运维工具</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">系统集成</span><span class="arrow end"></span></button><!----></section></li><li><section 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href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#创建元数据模板" class="router-link-active router-link-exact-active toc-link level3">创建元数据模板</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#挂载元数据模板" class="router-link-active router-link-exact-active toc-link level3">挂载元数据模板</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#查看元数据模板" class="router-link-active router-link-exact-active toc-link level3">查看元数据模板</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#解除元数据模板" class="router-link-active router-link-exact-active toc-link level3">解除元数据模板</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#卸载元数据模板" class="router-link-active router-link-exact-active toc-link level3">卸载元数据模板</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/zh/UserGuide/V0.13.x/Operate-Metadata/Template.html#删除元数据模板" class="router-link-active router-link-exact-active toc-link level3">删除元数据模板</a></li><!----><!--]--></ul><!--]--></ul></div><!--[--><!----><!--]--></aside></div><!----><div class="theme-hope-content"><!-- |
| |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
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| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
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| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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| specific language governing permissions and limitations |
| under the License. |
| |
| --><h2 id="元数据模板" tabindex="-1"><a class="header-anchor" href="#元数据模板" aria-hidden="true">#</a> 元数据模板</h2><p>IoTDB 支持元数据模板功能，实现同类型不同实体的物理量元数据共享，减少元数据内存占用，同时简化同类型实体的管理。</p><p>注：以下语句中的 <code>schema</code> 关键字可以省略。</p><h3 id="创建元数据模板" tabindex="-1"><a class="header-anchor" href="#创建元数据模板" aria-hidden="true">#</a> 创建元数据模板</h3><p>创建元数据模板的 SQL 语法如下：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">CREATE</span> <span class="token keyword">SCHEMA</span>? TEMPLATE <span class="token operator"><</span>templateName<span class="token operator">></span> ALIGNED? <span class="token string">'('</span> <span class="token operator"><</span>measurementId<span class="token operator">></span> <span class="token operator"><</span>attributeClauses<span class="token operator">></span> <span class="token punctuation">[</span><span class="token string">','</span> <span class="token operator"><</span>measurementId<span class="token operator">></span> <span class="token operator"><</span>attributeClauses<span class="token operator">></span><span class="token punctuation">]</span><span class="token operator">+</span> <span class="token string">')'</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>示例1：</strong> 创建包含两个非对齐序列的元数据模板</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> create schema template t1 <span class="token punctuation">(</span>temperature FLOAT <span class="token assign-left variable">encoding</span><span class="token operator">=</span>RLE, status BOOLEAN <span class="token assign-left variable">encoding</span><span class="token operator">=</span>PLAIN <span class="token assign-left variable">compression</span><span class="token operator">=</span>SNAPPY<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>示例2：</strong> 创建包含一组对齐序列的元数据模板</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> create schema template t2 aligned <span class="token punctuation">(</span>lat FLOAT <span class="token assign-left variable">encoding</span><span class="token operator">=</span>Gorilla, lon FLOAT <span class="token assign-left variable">encoding</span><span class="token operator">=</span>Gorilla<span class="token punctuation">)</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>其中，物理量 <code>lat</code> 和 <code>lon</code> 是对齐的。</p><h3 id="挂载元数据模板" tabindex="-1"><a class="header-anchor" href="#挂载元数据模板" aria-hidden="true">#</a> 挂载元数据模板</h3><p><strong>为了更好地适配未来版本的更新及各模块的协作，我们强烈建议您将模板设置在存储组及存储组下层的节点中。</strong></p><p>挂载元数据模板的 SQL 语句如下所示：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> <span class="token builtin class-name">set</span> schema template t1 to root.sg1.d1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>挂载好元数据模板后，即可进行数据的写入。例如存储组为 root.sg1，模板 t1 被挂载到了节点 root.sg1.d1，那么可直接向时间序列（如 root.sg1.d1.temperature 和 root.sg1.d1.status）写入时间序列数据，该时间序列已可被当作正常创建的序列使用。</p><p><strong>注意</strong>：在插入数据之前，模板定义的时间序列不会被创建。可以使用如下SQL语句在插入数据前创建时间序列：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> create timeseries of schema template on root.sg1.d1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>示例：</strong> 执行以下语句</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code><span class="token builtin class-name">set</span> schema template t1 to root.sg1.d1 |
| <span class="token builtin class-name">set</span> schema template t2 to root.sg1.d2 |
| create timeseries of schema template on root.sg1.d1 |
| create timeseries of schema template on root.sg1.d2 |
| </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></div><p>查看此时的时间序列：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">show</span> timeseries root<span class="token punctuation">.</span>sg1<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+-----------------------+-----+-------------+--------+--------+-----------+----+----------+--------+-------------------+ |
| <span class="token operator">|</span> timeseries<span class="token operator">|</span><span class="token builtin class-name">alias</span><span class="token operator">|</span>storage group<span class="token operator">|</span>dataType<span class="token operator">|</span>encoding<span class="token operator">|</span>compression<span class="token operator">|</span>tags<span class="token operator">|</span>attributes<span class="token operator">|</span>deadband<span class="token operator">|</span>deadband parameters<span class="token operator">|</span> |
| +-----------------------+-----+-------------+--------+--------+-----------+----+----------+--------+-------------------+ |
| <span class="token operator">|</span>root.sg1.d1.temperature<span class="token operator">|</span> null<span class="token operator">|</span> root.sg1<span class="token operator">|</span> FLOAT<span class="token operator">|</span> RLE<span class="token operator">|</span> SNAPPY<span class="token operator">|</span>null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> |
| <span class="token operator">|</span> root.sg1.d1.status<span class="token operator">|</span> null<span class="token operator">|</span> root.sg1<span class="token operator">|</span> BOOLEAN<span class="token operator">|</span> PLAIN<span class="token operator">|</span> SNAPPY<span class="token operator">|</span>null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> |
| <span class="token operator">|</span> root.sg1.d2.lon<span class="token operator">|</span> null<span class="token operator">|</span> root.sg1<span class="token operator">|</span> FLOAT<span class="token operator">|</span> GORILLA<span class="token operator">|</span> SNAPPY<span class="token operator">|</span>null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> |
| <span class="token operator">|</span> root.sg1.d2.lat<span class="token operator">|</span> null<span class="token operator">|</span> root.sg1<span class="token operator">|</span> FLOAT<span class="token operator">|</span> GORILLA<span class="token operator">|</span> SNAPPY<span class="token operator">|</span>null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</span> null<span class="token operator">|</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><p>查看此时的设备：</p><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token keyword">show</span> devices root<span class="token punctuation">.</span>sg1<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+---------------+---------+ |
| <span class="token operator">|</span> devices<span class="token operator">|</span>isAligned<span class="token operator">|</span> |
| +---------------+---------+ |
| <span class="token operator">|</span> root.sg1.d1<span class="token operator">|</span> <span class="token boolean">false</span><span class="token operator">|</span> |
| <span class="token operator">|</span> root.sg1.d2<span class="token operator">|</span> <span class="token boolean">true</span><span class="token operator">|</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></div><h3 id="查看元数据模板" tabindex="-1"><a class="header-anchor" href="#查看元数据模板" aria-hidden="true">#</a> 查看元数据模板</h3><ul><li>查看所有元数据模板</li></ul><p>SQL 语句如下所示：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> show schema templates |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+-------------+ |
| <span class="token operator">|</span>template name<span class="token operator">|</span> |
| +-------------+ |
| <span class="token operator">|</span> t2<span class="token operator">|</span> |
| <span class="token operator">|</span> t1<span class="token operator">|</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></div><ul><li>查看某个元数据模板下的物理量</li></ul><p>SQL 语句如下所示：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> show nodes <span class="token keyword">in</span> schema template t1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+-----------+--------+--------+-----------+ |
| <span class="token operator">|</span>child nodes<span class="token operator">|</span>dataType<span class="token operator">|</span>encoding<span class="token operator">|</span>compression<span class="token operator">|</span> |
| +-----------+--------+--------+-----------+ |
| <span class="token operator">|</span>temperature<span class="token operator">|</span> FLOAT<span class="token operator">|</span> RLE<span class="token operator">|</span> SNAPPY<span class="token operator">|</span> |
| <span class="token operator">|</span> status<span class="token operator">|</span> BOOLEAN<span class="token operator">|</span> PLAIN<span class="token operator">|</span> SNAPPY<span class="token operator">|</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></div><ul><li>查看挂载了某个元数据模板的路径前缀</li></ul><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> show paths <span class="token builtin class-name">set</span> schema template t1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+-----------+ |
| <span class="token operator">|</span>child paths<span class="token operator">|</span> |
| +-----------+ |
| <span class="token operator">|</span>root.sg1.d1<span class="token operator">|</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><ul><li>查看使用了某个元数据模板（即序列已创建）的路径前缀</li></ul><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> show paths using schema template t1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>执行结果如下：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>+-----------+ |
| <span class="token operator">|</span>child paths<span class="token operator">|</span> |
| +-----------+ |
| <span class="token operator">|</span>root.sg1.d1<span class="token operator">|</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="解除元数据模板" tabindex="-1"><a class="header-anchor" href="#解除元数据模板" aria-hidden="true">#</a> 解除元数据模板</h3><p>对于挂载了元数据模板的节点或其孩子节点，如果：1）曾按模板中的序列写入了数据，或2）使用了 <code>create timeseries of schema template</code>，则在使用以下命令之前，不能够卸载或删除元数据模板：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> deactivate schema template t1 from root.sg.d1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>注意</strong>：这一操作会删除对应节点下按照模板中的序列写入的数据。</p><h3 id="卸载元数据模板" tabindex="-1"><a class="header-anchor" href="#卸载元数据模板" aria-hidden="true">#</a> 卸载元数据模板</h3><p>卸载元数据模板的 SQL 语句如下所示：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> <span class="token builtin class-name">unset</span> schema template t1 from root.sg1.d1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="删除元数据模板" tabindex="-1"><a class="header-anchor" href="#删除元数据模板" aria-hidden="true">#</a> 删除元数据模板</h3><p>删除元数据模板的 SQL 语句如下所示：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code>IoTDB<span class="token operator">></span> drop schema template t1 |
| </code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p><strong>注意</strong>：不能删除尚未卸载的模板。</p></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/0.13/docs/zh/UserGuide/Operate-Metadata/Template.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<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></div><div class="meta-item git-info"><!----><!----></div></footer><nav class="page-nav"><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/Timeseries.html" class="nav-link prev" aria-label="时间序列操作"><div class="hint"><span class="arrow start"></span>上一页</div><div class="link"><!---->时间序列操作</div></a><a href="/zh/UserGuide/V0.13.x/Operate-Metadata/TTL.html" class="nav-link next" aria-label="TTL"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">TTL<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/0.13</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2023 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"> We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. </p></footer></div><!--]--><!--]--><!----><!--]--></div> |
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