| import{_ as s,O as n,P as a,ah as e,aW as t}from"./framework-e4340ccd.js";const p={},o=t(`<h1 id="键值对" tabindex="-1"><a class="header-anchor" href="#键值对" aria-hidden="true">#</a> 键值对</h1><p><strong>键值对的键和值可以被定义为标识符或者常量。</strong></p><p>下面将介绍键值对的使用场景。</p><ul><li>触发器中表示触发器属性的键值对。参考示例语句中 WITH 后的属性键值对。</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>时间序列中用于表示标签和属性的键值对。</li></ul><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># 创建时间序列时设定标签和属性,用字符串来表示键值对。</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"># 创建时间序列时设定标签和属性,用标识符和常量来表示键值对。</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"># 修改时间序列的标签和属性</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"># 修改标签名</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"># 插入别名、标签、属性</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"># 添加新的标签</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"># 添加新的属性</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"># 查询符合条件的时间序列信息</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>创建 Pipe 以及 PipeSink 时表示属性的键值对。</li></ul><div class="language-sql line-numbers-mode" data-ext="sql"><pre class="language-sql"><code><span class="token comment"># 创建 PipeSink 时表示属性</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"># 创建 Pipe 时在 WITH 子句中表示属性</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> |
| </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>`,15);function i(c,l){return n(),a("div",null,[e(` |
| |
| 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 |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| |
| `),o])}const u=s(p,[["render",i],["__file","KeyValue-Pair.html.vue"]]);export{u as default}; |