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<p>#resultType与resultMap</p>
<p>resultType：设置默认的映射关系</p>
<p>resultMap:设置自定义的映射关系</p>
<p>查询功能必须设置这两个其中的一个</p>
<p>在resources下面创建包，那么就得需要以斜线/的方式来进行分割，而不能用.</p>
<h1 id="一、搭建MyBatis"><a href="#一、搭建MyBatis" class="headerlink" title="一、搭建MyBatis"></a>一、搭建MyBatis</h1><h2 id="2-创建maven工程"><a href="#2-创建maven工程" class="headerlink" title="2.创建maven工程"></a>2.创建maven工程</h2><p><strong>a>打包方式：jar</strong><br><strong>b>引入依赖</strong></p>
<figure class="highlight xml"><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><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependencies</span>></span></span><br><span class="line"><span class="comment"><!-- Mybatis核心 --></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">groupId</span>></span>org.mybatis<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">artifactId</span>></span>mybatis<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">version</span>></span>3.5.7<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="comment"><!-- junit测试 --></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">groupId</span>></span>junit<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">artifactId</span>></span>junit<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">version</span>></span>4.12<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"><<span class="name">scope</span>></span>test<span class="tag"></<span class="name">scope</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="comment"><!-- MySQL驱动 --></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">groupId</span>></span>mysql<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">artifactId</span>></span>mysql-connector-java<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">version</span>></span>5.1.3<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependencies</span>></span></span><br></pre></td></tr></table></figure>
<h2 id="3、创建MyBatis的核心配置文件"><a href="#3、创建MyBatis的核心配置文件" class="headerlink" title="3、创建MyBatis的核心配置文件"></a>3、创建MyBatis的核心配置文件</h2>
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<p>#一、SpringMVC简介</p>
<h3 id="1、什么是MVC"><a href="#1、什么是MVC" class="headerlink" title="1、什么是MVC"></a>1、什么是MVC</h3><p>MVC是一种软件架构的思想，将软件按照模型、视图、控制器来划分</p>
<p>M：Model，模型层，指工程中的JavaBean，作用是处理数据</p>
<p>JavaBean分为两类：</p>
<ul>
<li>一类称为实体类Bean：专门存储业务数据的，如 Student、User 等</li>
<li>一类称为业务处理 Bean：指 Service 或 Dao 对象，专门用于处理业务逻辑和数据访问。</li>
</ul>
<p>V：View，视图层，指工程中的html或jsp等页面，作用是与用户进行交互，展示数据</p>
<p>C：Controller，控制层，指工程中的servlet，作用是接收请求和响应浏览器</p>
<p>MVC的工作流程：<br>用户通过视图层发送请求到服务器，在服务器中请求被Controller接收，Controller调用相应的Model层处理请求，处理完毕将结果返回到Controller，Controller再根据请求处理的结果找到相应的View视图，渲染数据后最终响应给浏览器</p>
<h3 id="2、什么是SpringMVC"><a href="#2、什么是SpringMVC" class="headerlink" title="2、什么是SpringMVC"></a>2、什么是SpringMVC</h3>
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<p>内层判断：如果内层不加if判断，当有多个进程进入第一个判断内,也就是（1）的地方，就会实例化多次.</p>
<p>外层判断：当线程1走完了内层判断，对象实例化了，线程3也调用了getInstace（）函数，如果没有加外层的判断线程3还是要继续等待线程2的完成，而加上外层判断，就不需要等待了，直接返回了实例化的对象，提高了效率。</p>
<p>外层的判断是为了提高效率，内层的判断就是保证只实例化一次实例。</p>
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