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@meiMingle
meiMingle committed Mar 24, 2024
1 parent d112ea3 commit 3bd7da7
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2 changes: 1 addition & 1 deletion 2022/09/12/maven项目构建加速（一）命令参数篇/index.html
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Expand Up @@ -198,7 +198,7 @@ <h1>maven项目构建加速（一）命令参数篇</h1>

<span class="tag">

<a href="/tags/maven/" style="color: #00a596">maven</a>
<a href="/tags/maven/" style="color: #00bcd4">maven</a>
</span>

</span>
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2 changes: 1 addition & 1 deletion 2022/09/13/maven项目构建加速（二）辅助工具篇/index.html
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Expand Up @@ -198,7 +198,7 @@ <h1>maven项目构建加速（二）辅助工具篇</h1>

<span class="tag">

<a href="/tags/maven/" style="color: #03a9f4">maven</a>
<a href="/tags/maven/" style="color: #00bcd4">maven</a>
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61 changes: 4 additions & 57 deletions 2024/03/13/数据库批量INSERT优化/index.html
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Expand Up @@ -198,40 +198,21 @@ <h1>数据库批量Insert优化</h1>

<span class="tag">

<a href="/tags/SQL%E4%BC%98%E5%8C%96/" style="color: #00a596">SQL优化</a>
<a href="/tags/SQL%E4%BC%98%E5%8C%96/" style="color: #00bcd4">SQL优化</a>
</span>

<span class="tag">

<a href="/tags/SQL%E5%90%88%E5%B9%B6/" style="color: #ff7d73">SQL合并</a>
<a href="/tags/SQL%E5%90%88%E5%B9%B6/" style="color: #ffa2c4">SQL合并</a>
</span>

</span>

</div>

<div class="content" v-pre>
<p>最近在做数据备份恢复时，数据库有一个限制，就是每小时只能执行几万条SQL语句。为了提高效率，将多个INSERT语句合并。假设我有30000条数据，那么将x个INSERT语句合并成一条执行，x取值为多少时，插入效率最高呢？</p>
<h1 id="一、准备环境和数据"><a href="#一、准备环境和数据" class="headerlink" title="一、准备环境和数据"></a>一、准备环境和数据</h1><p>数据库：Mysql8.0.33</p>
<p>建表语句：</p>
<pre><code class="mysql">-- ----------------------------
-- Table structure for employees
-- ----------------------------
DROP TABLE IF EXISTS `employees`;
CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,
`last_name` varchar(16) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,
`gender` enum(&#39;M&#39;,&#39;F&#39;) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb3 COLLATE = utf8mb3_general_ci ROW_FORMAT = Dynamic;
</code></pre>
<p>INSERT 语句：</p>
<p><a href="./INSERT.sql">INSERT语句</a></p>
<p>以下是用来合并SQL的代码，使x分别取值<br>1、2、3、4、5、6、7、8、9、10、11、12、13、14、15、16、17、18、19、20、<br>21、22、23、24、25、26、27、28、29、30、31、32、33、34、35、36、37、38、39、40</p>
<p>得到40个SQL文件</p>
<h1 id="一、合并多条Insert语句"><a href="#一、合并多条Insert语句" class="headerlink" title="一、合并多条Insert语句"></a>一、合并多条Insert语句</h1><p>提高批量插入语句执行效率的办法之一就是将多条INSERT合并为一条，以下代码支把从Navicat导出的转储文件（结构和数据）自动合并INSERT语句，自动忽略非INSERT语句。</p>
<p>TODO：注释过滤</p>
<pre><code class="java">package org.example;

import cn.hutool.core.io.FileUtil;
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&#125;
</code></pre>
<h1 id="二、执行结果"><a href="#二、执行结果" class="headerlink" title="二、执行结果"></a>二、执行结果</h1><table>
<thead>
<tr>
<th></th>
<th></th>
<th></th>
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</thead>
<tbody><tr>
<td></td>
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</tbody></table>

</div>

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62 changes: 60 additions & 2 deletions 2024/03/16/Excel导入导出方案汇总/index.html
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Expand Up @@ -198,15 +198,73 @@ <h1>Excel导入导出方案汇总</h1>

<span class="tag">

<a href="/tags/excel/" style="color: #ff7d73">excel</a>
<a href="/tags/excel/" style="color: #00bcd4">excel</a>
</span>

</span>

</div>

<div class="content" v-pre>

<table>
<tr> <!-- 第一行数据 -->
<th>分类</th>
<th>库名</th> <!-- 表头，用于居中显示；合并 9 行为 CBW 数据封包 -->
<th>优点点</th>
<th>缺点</th>
<th>备注</th>
</tr>
<tr> <!-- 第二行数据 -->
<th rowspan="5"> POI系 </th> <!-- 表头，用于居中显示；合并 2 行为 字节 -->
</tr>
<tr> <!-- 一 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr> <!-- 二 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr> <!-- 三 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr> <!-- 四 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr>
<td rolspan="5"> 非POI系 </th> <!-- 表头，用于居中显示；合并 8 列 -->
</tr>
<tr> <!-- 一 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr> <!-- 二 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
<tr> <!-- 三 -->
<td> POI </td>
<td> 优 </td>
<td> 缺 </td>
<td> 其他 </td>
</tr>
</table>


</div>


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2 changes: 1 addition & 1 deletion 2024/03/16/解决导出文件中文名乱码/index.html
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Expand Up @@ -198,7 +198,7 @@ <h1>解决导出文件中文名乱码</h1>

<span class="tag">

<a href="/tags/%E7%BC%96%E7%A0%81/" style="color: #00bcd4">编码</a>
<a href="/tags/%E7%BC%96%E7%A0%81/" style="color: #ffa2c4">编码</a>
</span>

<span class="tag">
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