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电影</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友情链接</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Mybaits 架构原理</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-10-01T05:24:18.000Z" title="发表于 2022-10-01 13:24:18">2022-10-01</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-10-09T05:56:31.363Z" title="更新于 2022-10-09 13:56:31">2022-10-09</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">Java 学习笔记</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/Mybatis-%E6%A1%86%E6%9E%B6/">Mybatis 框架</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">635</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>2分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Mybaits 架构原理"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Mybaits-架构原理"><a href="#Mybaits-架构原理" class="headerlink" title="Mybaits 架构原理"></a>Mybaits 架构原理</h1><p>使用到的测试类：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">selectAllTest</span><span class="params">()</span> <span class="keyword">throws</span> IOException {</span><br><span class="line"> <span class="comment">// 1. 将配置文件读取成输入流</span></span><br><span class="line"> <span class="type">InputStream</span> <span class="variable">resourceAsStream</span> <span class="operator">=</span> Resources.getResourceAsStream(<span class="string">"SqlMapConfig.xml"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 2. 解析配置文件，封装为 Configuration 对象。创建 DefaultSqlSessionFactory 对象返回</span></span><br><span class="line"> <span class="type">SqlSessionFactory</span> <span class="variable">factory</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SqlSessionFactoryBuilder</span>().build(resourceAsStream);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 3.1 生产了 DefaultSqlSession 对象，设置了事务不自动提交</span></span><br><span class="line"> <span class="comment">// 3.2 生产了 SimpleExecutor（extends BaseExecutor） 执行器，如果开启了缓存就包装成为 CachingExecutor 执行器</span></span><br><span class="line"> <span class="type">SqlSession</span> <span class="variable">sqlSession</span> <span class="operator">=</span> factory.openSession();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 4. 根据 statementId 从 Configuration 中获取指定的 MappedStatement，将查询任务委派给 executor（调用 executor 的 query 方法）</span></span><br><span class="line"> List<User> users = sqlSession.selectList(<span class="string">"com.example.dao.UserDao.findAll"</span>);</span><br><span class="line"> <span class="keyword">for</span> (User user : users) {</span><br><span class="line"> System.out.println(user);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> sqlSession.close();</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="主要构件及其相互关系"><a href="#主要构件及其相互关系" class="headerlink" title="主要构件及其相互关系"></a>主要构件及其相互关系</h2><table>
<thead>
<tr>
<th align="center">构件</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td align="center">SqlSession</td>
<td>作为MyBatis工作的主要顶层API，表示和数据库交互的会话，完成必要数据库增删改查功能。</td>
</tr>
<tr>
<td align="center">Executor</td>
<td>MyBatis执行器，是MyBatis调度的核心，负责SQL语句的生成和查询缓 存的维护。</td>
</tr>
<tr>
<td align="center">StatementHandler</td>
<td>封装了JDBC Statement操作，负责对JDBC statement的操作，如设置参数、将Statement结果集转换成List集合。</td>
</tr>
<tr>
<td align="center">ParameterHandler</td>
<td>负责对用户传递的参数转换成JDBC Statement所需要的参数。</td>
</tr>
<tr>
<td align="center">ResultSetHandler</td>
<td>负责将JDBC返回的ResultSet结果集对象转换成List类型的集合。</td>
</tr>
<tr>
<td align="center">TypeHandler</td>
<td>负责java数据类型和jdbc数据类型之间的映射和转换。</td>
</tr>
<tr>
<td align="center">MappedStatement</td>
<td>MappedStatement维护了一条<select、update、delete、insert>节点的封装。</td>
</tr>
<tr>
<td align="center">SqlSource</td>
<td>负责根据用户传递的parameterObject，动态地生成SQL语句，将信息封装到BoundSql对象中，并返回。</td>
</tr>
<tr>
<td align="center">BoundSql</td>
<td>表示动态生成的SQL语句以及相应的参数信息</td>
</tr>
</tbody></table>
<h3 id="关系依赖"><a href="#关系依赖" class="headerlink" title="关系依赖"></a>关系依赖</h3><p><img src="https://s2.loli.net/2022/10/01/46p5Emr3uRMd7vo.png"></p>
<h2 id="“-”-和-“-”-的区别"><a href="#“-”-和-“-”-的区别" class="headerlink" title="“${}” 和 “#{}” 的区别"></a>“${}” 和 “#{}” 的区别</h2><p>SqlSource 会直接替换 sql 中的 “${}” 这种参数（相当于文本替换，会有 sql 注入的风险）。而 “#{}” 则替换为 “?” 生成 jdbc 可以运行的占位符 sql，同时 “#{}” 中的内容保存到 parameterMappings 中，封装到 BoundSql 对象中返回。</p>
<h2 id="Mybatis-的查询流程"><a href="#Mybatis-的查询流程" class="headerlink" title="Mybatis 的查询流程"></a>Mybatis 的查询流程</h2><p><img src="https://s2.loli.net/2022/10/01/MPuBImNc5wDxS26.png"></p>
<h2 id="导入源码遇到的问题："><a href="#导入源码遇到的问题：" class="headerlink" title="导入源码遇到的问题："></a>导入源码遇到的问题：</h2><p>如果引入了 javassist 依赖，但是遇到了 Cannot find class: javassist.util.proxy.ProxyFactory，将引入的依赖的 optional 改成 false。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><dependency></span><br><span class="line"> <groupId>org.javassist</groupId></span><br><span class="line"> <artifactId>javassist</artifactId></span><br><span class="line"> <version><span class="number">3.28</span><span class="number">.0</span>-GA</version></span><br><span class="line"> <scope>compile</scope></span><br><span class="line"> <optional><span class="literal">false</span></optional></span><br><span class="line"></dependency></span><br></pre></td></tr></table></figure>
<p>报错 java.lang.NoClassDefFoundError: ognl/PropertyAccessor 也是同样处理</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><dependency></span><br><span class="line"> <groupId>ognl</groupId></span><br><span class="line"> <artifactId>ognl</artifactId></span><br><span class="line"> <version><span class="number">3.3</span><span class="number">.2</span></version></span><br><span class="line"> <scope>compile</scope></span><br><span class="line"> <optional><span class="literal">false</span></optional></span><br><span class="line"></dependency></span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a 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