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class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/java/">java</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/Mybatis/">Mybatis</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">1.3k</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>4分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="mybatis延迟加载-缓存机制(六)"><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"></span></span></div></div></div><article class="post-content" id="article-container"><h2 id="延迟加载">延迟加载</h2>
<p>MyBatis中的延迟加载，也称为懒加载，是指在进行表的关联查询时，按照设置延迟规则推迟对关联对象的select查询。例如在进行一对多查询的时候，只查询出一方，当程序中需要多方的数据时，mybatis再发出sql语句进行查询，这样子延迟加载就可以的减少数据库压力。</p>
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<p>MyBatis 的延迟加载只是对关联对象的查询有迟延设置，对于主加载对象都是直接执行查询语句的。</p>
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<h3 id="加载时机">加载时机</h3>
<p>直接加载：执行完对主加载对象的 select 语句，马上执行对关联对象的 select 查询。</p>
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<p>侵入式延迟：执行对主加载对象的查询时，不会执行对关联对象的查询。但当要访问主加载对象的详情属性时，就会马上执行关联对象的select查询。</p>
<p>深度延迟：执行对主加载对象的查询时，不会执行对关联对象的查询。访问主加载对象的详情时也不会执行关联对象的select查询。只有当真正访问关联对象的详情时，才会执行对关联对象的 select 查询。</p>
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<div class="note info flat"><p>注意：延迟加载的应用要求：关联对象的查询与主加载对象的查询必须是分别进行的select语句，不能是使用多表连接所进行的select查询。<br>
因为，多表连接查询，实质是对一张表的查询，对由多个表连接后形成的一张表的查询。会一次性将多张表的所有信息查询出来。</p>
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</div>
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<h3 id="侵入式延迟加载">侵入式延迟加载</h3>
<ol>
<li>
<p>Mybatis-config.xml大配置文件，首先开启延迟加载，然后再配置侵入式加载</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></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--开启延迟加载--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;lazyLoadingEnabled&quot;</span> <span class="attr">value</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!--配置侵入式延迟加载   默认为false（深度加载）</span></span><br><span class="line"><span class="comment">    侵入式：默认只会执行主加载SQL，那么当访问主加载对象的详细信息时才会执行关联对象的SQL查询</span></span><br><span class="line"><span class="comment">    深度延迟：默认只执行主加载SQL，那么当调用到主加载对象中关联对象的信息时才会执行关联对象的SQL查询</span></span><br><span class="line"><span class="comment"> --&gt;</span>	</span><br><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;aggressiveLazyLoading&quot;</span> <span class="attr">value</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li>
<p>不调用主加载对象时只有一条SQL</p>
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<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231810.png" alt="img"></p>
<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231811.png" alt="img"></p>
</li>
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<li>
<p>调用主加载对象的信息时会产生两条SQL</p>
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<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231812.png" alt="img"></p>
<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231813.png" alt="img"></p>
</li>
</ol>
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<h3 id="深入式延迟加载">深入式延迟加载</h3>
<ol>
<li>
<p>Mybatis-config.xml大配置文件，首先开启延迟加载，然后再配置深度加载</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></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--开启延迟加载--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;lazyLoadingEnabled&quot;</span> <span class="attr">value</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!--配置侵入式延迟加载   默认为false（深度加载）</span></span><br><span class="line"><span class="comment">      侵入式：默认只会执行主加载SQL，那么当访问主加载对象的详细信息时才会执行关联对象的SQL查询</span></span><br><span class="line"><span class="comment">      深度延迟：默认只执行主加载SQL，那么当调用到主加载对象中关联对象的信息时才会执行关联对象的SQL查询</span></span><br><span class="line"><span class="comment">    --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;aggressiveLazyLoading&quot;</span> <span class="attr">value</span>=<span class="string">&quot;false&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li>
<p>调用主加载对象时不会执行第二条加载SQL</p>
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<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231814.png" alt="img"></p>
<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231915.png" alt="img"></p>
</li>
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<li>
<p>调用关联对象详细信息时会执行第二次查询</p>
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<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231916.png" alt="img"></p>
<p><img src="https://img.jbzj.com/file_images/article/201910/2019102414231917.png" alt="img"></p>
</li>
</ol>
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<h2 id="缓存">缓存</h2>
<p>MyBatis拥有自己的缓存结构，可以用来缓解数据库压力，加快查询速度。</p>
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<p>MyBatis提供一级缓存和二级缓存的机制。</p>
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<h3 id="一级缓存">一级缓存</h3>
<p>一级缓存是SqlSession级别的缓存(默认是支持一级缓存，不需要再配置文件中配置一级缓存)，在操作数据库时，每个SqlSession类的实例对象中有一个数据结构（HashMap）可以用来存储缓存数据，不同的SqlSession类的实例对象缓存的数据区域（HashMap）是互不影响的。</p>
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<p>当在同一个SqlSession中执行两次相同的sql语句时，第一次执行完毕会将数据写到内存中，第二次查询不执行sql直接从内存中获取。</p>
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<h3 id="二级缓存">二级缓存</h3>
<p>二级缓存是Mapper级别的缓存，多个SqlSession类的实例对象操作<u>同一个Mapper配置文件</u>中的sql语句，多个SqlSession类的实例对象可以共用二级缓存</p>
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<p>二级缓存是跨SqlSession的。</p>
<p>一个Mapper有一个自己的二级缓存区域（按照namespace划分），两个Mapper的namespace如果相同，那么这两个Mapper执行的sql查询会被缓存在同一个二级缓存中。</p>
<p>开启二级缓存：要开启二级缓存需要在mybatis配置文件中设置cacheEnabled属性为true</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></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">settings</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;cacheEnabled&quot;</span> <span class="attr">value</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">settings</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><img src="https://gitee.com/ajream/images/raw/master/img/20210829001748_image-20210829001744654.png" alt="image-20210829001744654"></p>
<p>MyBatis的缓存模式如图所示：</p>
<p><img src="https://gitee.com/ajream/images/raw/master/img/20210829001807_image-20210829001805748.png" alt="image-20210829001805748"></p>
<p>注意：有些时候在web工程中会将执行查询操作的方法封装在某个Service方法中，当查询万一次后，Service方法结束，此时SqlSession类的实例对下岗就会关闭，一级缓存就会被清空，测试若再次调用Service方法查询同一个信息，新打开一个SqlSession类的实例对象，由于一级缓存区域是空的，因而无法从缓存中获取信息；出现这种情况时，就可以使用二级缓存。</p>
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</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>mybatis延迟加载-缓存机制(六)</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://ajream.gitee.io/posts/3b32a20d.html">http://ajream.gitee.io/posts/3b32a20d.html</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a" style="display: inline-block;width: 120px"><h>作者</h><div class="post-copyright-cc-info"><h>aJream</h></div></div><div class="post-copyright-c" style="display: inline-block;width: 120px"><h>发布于</h><div class="post-copyright-cc-info"><h>2021-08-27</h></div></div><div class="post-copyright-u" style="display: inline-block;width: 120px"><h>更新于</h><div class="post-copyright-cc-info"><h>2021-08-30</h></div></div><div class="post-copyright-c" style="display: inline-block;width: 120px"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" 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})</script><script async data-pjax src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script></div><!-- hexo injector body_end start --> <script data-pjax>if(document.getElementById('recent-posts') && (location.pathname ==='/'|| '/' ==='all')){
    var parent = document.getElementById('recent-posts');
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    var child = '<div class="recent-post-item" style="width:100%;height: auto"><div id="catalog_magnet"><div class="magnet_item"><a class="magnet_link" href="/categories/java/"><div class="magnet_link_context" style=""><span style="font-weight:500;flex:1">📚 aJreamのJava全栈学习 (69)</span><span style="padding:0px 4px;border-radius: 8px;"><i class="fas fa-arrow-circle-right"></i></span></div></a></div><div class="magnet_item"><a class="magnet_link" href="/categories/Hexo/"><div class="magnet_link_context" style=""><span style="font-weight:500;flex:1">🎮 aJreamのHexo博客搭建&主题配置 (3)</span><span style="padding:0px 4px;border-radius: 8px;"><i class="fas fa-arrow-circle-right"></i></span></div></a></div><div class="magnet_item"><a class="magnet_link" href="/categories/win10/"><div class="magnet_link_context" style=""><span style="font-weight:500;flex:1">💻 aJreamのWin10主题配置 (3)</span><span style="padding:0px 4px;border-radius: 8px;"><i class="fas fa-arrow-circle-right"></i></span></div></a></div><div class="magnet_item"><a class="magnet_link" href="/categories/硬件学习/"><div class="magnet_link_context" style=""><span style="font-weight:500;flex:1">🔧 aJreamの硬件学习 (24)</span><span style="padding:0px 4px;border-radius: 8px;"><i class="fas fa-arrow-circle-right"></i></span></div></a></div><a class="magnet_link_more"  href="http://ajream.gitee.io/categories" style="flex:1;text-align: center;margin-bottom: 10px;">查看更多...</a></div></div>';
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    console.log('已挂载magnet')
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                        function butterfly_swiper_injector_config(){
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  </script><script src="https://pv.sohu.com/cityjson?ie=utf-8"></script><script data-pjax src="https://cdn.jsdelivr.net/npm/hexo-butterfly-clock/lib/clock.min.js"></script><div class="js-pjax"><script async="async">var arr = document.getElementsByClassName('recent-post-item');
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for(var i = 0;i<arr.length;i++){
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  <script data-pjax src="https://cdn.jsdelivr.net/gh/Zfour/hexo-github-calendar@1.16/hexo_githubcalendar.js"></script>
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