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sidebar-page" aria-label="Session And TsFile API"><!---->Session And TsFile API<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/UserGuide/V1.1.x/Syntax-Conventions/Detailed-Grammar.html" class="nav-link sidebar-link sidebar-page" aria-label="Detailed Definitions of Lexical and Grammar"><!---->Detailed Definitions of Lexical and Grammar<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li></ul></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">API</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Operate Metadata</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Write Data (Update Data)</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Delete Data</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Query Data</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Operators and Functions</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Trigger</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Monitor and Alert</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Administration Management</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Maintenance Tools</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Collaboration of Edge and Cloud</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Ecosystem Integration</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Cluster</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">FAQ</span><span class="arrow end"></span></button><!----></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Reference</span><span class="arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main class="page" id="main-content"><!--[--><!----><nav class="breadcrumb disable"></nav><div class="page-title"><h1><!---->Key-Value Pair</h1><div class="page-info"><!----><!----><!----><!----><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 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| --><h1 id="key-value-pair" tabindex="-1"><a class="header-anchor" href="#key-value-pair" aria-hidden="true">#</a> Key-Value Pair</h1><p><strong>The key/value of an attribute can be constant(including string) and identifier.</strong></p><p>Below are usage scenarios of key-value pair:</p><ul><li>Attributes fields of trigger. See the attributes after <code>With</code> clause in the example below:</li></ul><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># 以字符串形式表示键值对</span> |
| <span class="token keyword">CREATE</span> <span class="token keyword">TRIGGER</span> <span class="token identifier"><span class="token punctuation">`</span>alert-listener-sg1d1s1<span class="token punctuation">`</span></span> |
| <span class="token keyword">AFTER</span> <span class="token keyword">INSERT</span> |
| <span class="token keyword">ON</span> root<span class="token punctuation">.</span>sg1<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 |
| <span class="token keyword">AS</span> <span class="token string">'org.apache.iotdb.db.engine.trigger.example.AlertListener'</span> |
| <span class="token keyword">WITH</span> <span class="token punctuation">(</span> |
| <span class="token string">'lo'</span> <span class="token operator">=</span> <span class="token string">'0'</span><span class="token punctuation">,</span> |
| <span class="token string">'hi'</span> <span class="token operator">=</span> <span class="token string">'100.0'</span> |
| <span class="token punctuation">)</span> |
| |
| <span class="token comment"># 以标识符和常量形式表示键值对</span> |
| <span class="token keyword">CREATE</span> <span class="token keyword">TRIGGER</span> <span class="token identifier"><span class="token punctuation">`</span>alert-listener-sg1d1s1<span class="token punctuation">`</span></span> |
| <span class="token keyword">AFTER</span> <span class="token keyword">INSERT</span> |
| <span class="token keyword">ON</span> root<span class="token punctuation">.</span>sg1<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 |
| <span class="token keyword">AS</span> <span class="token string">'org.apache.iotdb.db.engine.trigger.example.AlertListener'</span> |
| <span class="token keyword">WITH</span> <span class="token punctuation">(</span> |
| lo <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> |
| hi <span class="token operator">=</span> <span class="token number">100.0</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 class="line-number"></div><div class="line-number"></div></div></div><ul><li>Key-value pair to represent tag/attributes in timeseries:</li></ul><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># create timeseries using string as key/value</span> |
| <span class="token keyword">CREATE</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1<span class="token punctuation">(</span>temprature<span class="token punctuation">)</span> |
| <span class="token keyword">WITH</span> datatype <span class="token operator">=</span> <span class="token keyword">FLOAT</span><span class="token punctuation">,</span> encoding <span class="token operator">=</span> RLE<span class="token punctuation">,</span> compression <span class="token operator">=</span> SNAPPY<span class="token punctuation">,</span> <span class="token string">'max_point_number'</span> <span class="token operator">=</span> <span class="token string">'5'</span> |
| TAGS<span class="token punctuation">(</span><span class="token string">'tag1'</span> <span class="token operator">=</span> <span class="token string">'v1'</span><span class="token punctuation">,</span> <span class="token string">'tag2'</span><span class="token operator">=</span> <span class="token string">'v2'</span><span class="token punctuation">)</span> ATTRIBUTES<span class="token punctuation">(</span><span class="token string">'attr1'</span> <span class="token operator">=</span> <span class="token string">'v1'</span><span class="token punctuation">,</span> <span class="token string">'attr2'</span> <span class="token operator">=</span> <span class="token string">'v2'</span><span class="token punctuation">)</span> |
| |
| <span class="token comment"># create timeseries using constant as key/value</span> |
| <span class="token keyword">CREATE</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1<span class="token punctuation">(</span>temprature<span class="token punctuation">)</span> |
| <span class="token keyword">WITH</span> datatype <span class="token operator">=</span> <span class="token keyword">FLOAT</span><span class="token punctuation">,</span> encoding <span class="token operator">=</span> RLE<span class="token punctuation">,</span> compression <span class="token operator">=</span> SNAPPY<span class="token punctuation">,</span> max_point_number <span class="token operator">=</span> <span class="token number">5</span> |
| TAGS<span class="token punctuation">(</span>tag1 <span class="token operator">=</span> v1<span class="token punctuation">,</span> tag2 <span class="token operator">=</span> v2<span class="token punctuation">)</span> ATTRIBUTES<span class="token punctuation">(</span>attr1 <span class="token operator">=</span> v1<span class="token punctuation">,</span> attr2 <span class="token operator">=</span> v2<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><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># alter tags and attributes of timeseries</span> |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">SET</span> <span class="token string">'newTag1'</span> <span class="token operator">=</span> <span class="token string">'newV1'</span><span class="token punctuation">,</span> <span class="token string">'attr1'</span> <span class="token operator">=</span> <span class="token string">'newV1'</span> |
| |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">SET</span> newTag1 <span class="token operator">=</span> newV1<span class="token punctuation">,</span> attr1 <span class="token operator">=</span> newV1 |
| </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><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># rename tag</span> |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">RENAME</span> <span class="token string">'tag1'</span> <span class="token keyword">TO</span> <span class="token string">'newTag1'</span> |
| |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">RENAME</span> tag1 <span class="token keyword">TO</span> newTag1 |
| </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><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># upsert alias, tags, attributes</span> |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 UPSERT |
| ALIAS<span class="token operator">=</span><span class="token string">'newAlias'</span> TAGS<span class="token punctuation">(</span><span class="token string">'tag2'</span> <span class="token operator">=</span> <span class="token string">'newV2'</span><span class="token punctuation">,</span> <span class="token string">'tag3'</span> <span class="token operator">=</span> <span class="token string">'v3'</span><span class="token punctuation">)</span> ATTRIBUTES<span class="token punctuation">(</span><span class="token string">'attr3'</span> <span class="token operator">=</span><span class="token string">'v3'</span><span class="token punctuation">,</span> <span class="token string">'attr4'</span><span class="token operator">=</span><span class="token string">'v4'</span><span class="token punctuation">)</span> |
| |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 UPSERT |
| ALIAS <span class="token operator">=</span> newAlias TAGS<span class="token punctuation">(</span>tag2 <span class="token operator">=</span> newV2<span class="token punctuation">,</span> tag3 <span class="token operator">=</span> v3<span class="token punctuation">)</span> ATTRIBUTES<span class="token punctuation">(</span>attr3 <span class="token operator">=</span> v3<span class="token punctuation">,</span> attr4 <span class="token operator">=</span> v4<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></div><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># add new tags</span> |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">ADD</span> TAGS <span class="token string">'tag3'</span> <span class="token operator">=</span> <span class="token string">'v3'</span><span class="token punctuation">,</span> <span class="token string">'tag4'</span> <span class="token operator">=</span> <span class="token string">'v4'</span> |
| |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">ADD</span> TAGS tag3 <span class="token operator">=</span> v3<span class="token punctuation">,</span> tag4 <span class="token operator">=</span> v4 |
| </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><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># add new attributes</span> |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">ADD</span> ATTRIBUTES <span class="token string">'attr3'</span> <span class="token operator">=</span> <span class="token string">'v3'</span><span class="token punctuation">,</span> <span class="token string">'attr4'</span> <span class="token operator">=</span> <span class="token string">'v4'</span> |
| |
| <span class="token keyword">ALTER</span> timeseries root<span class="token punctuation">.</span>turbine<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1 <span class="token keyword">ADD</span> ATTRIBUTES attr3 <span class="token operator">=</span> v3<span class="token punctuation">,</span> attr4 <span class="token operator">=</span> v4 |
| </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><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># query for timeseries</span> |
| <span class="token keyword">SHOW</span> timeseries root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> WHRER <span class="token string">'unit'</span> <span class="token operator">=</span> <span class="token string">'c'</span> |
| |
| <span class="token keyword">SHOW</span> timeseries root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span><span class="token operator">*</span><span class="token operator">*</span> WHRER unit <span class="token operator">=</span> c |
| </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><ul><li>Attributes fields of Pipe and PipeSink.</li></ul><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># PipeSink example </span> |
| <span class="token keyword">CREATE</span> PIPESINK my_iotdb <span class="token keyword">AS</span> IoTDB <span class="token punctuation">(</span><span class="token string">'ip'</span> <span class="token operator">=</span> <span class="token string">'输入你的IP'</span><span class="token punctuation">)</span> |
| |
| <span class="token comment"># Pipe example </span> |
| <span class="token keyword">CREATE</span> PIPE my_pipe <span class="token keyword">TO</span> my_iotdb <span class="token keyword">FROM</span> |
| <span class="token punctuation">(</span><span class="token keyword">select</span> <span class="token operator">*</span><span class="token operator">*</span> <span class="token keyword">from</span> root <span class="token keyword">WHERE</span> <span class="token keyword">time</span><span class="token operator">>=</span>yyyy<span class="token operator">-</span>mm<span class="token operator">-</span>dd HH:MM:SS<span class="token punctuation">)</span> <span class="token keyword">WITH</span> <span class="token string">'SyncDelOp'</span> <span class="token operator">=</span> <span class="token string">'true'</span> |
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