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MyBatis动态SQL详解

时间：2021-07-01 10:21:17 帮助过：1人阅读

这条语句的意思非常简单，如果你提供了title参数，那么就要满足title=#{title}，同样如果你提供了Content和Owner的时候，它们也需要满足相应的条件，之后就是返回满足这些条件的所有Blog，这是非常有用的一个功能，以往我们使用其他类型框架或者直接使用JDBC的时候，如果我们要达到同样的选择效果的时候，我们就需要拼SQL语句，这是极其麻烦的，比起来，上述的动态SQL就要简单多了。

choose元素的作用就相当于JAVA中的switch语句，基本上跟JSTL中的choose的作用和用法是一样的，通常都是与when和otherwise搭配的。看如下一个例子：

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicChooseTest"<span class="pln"> <span class="atn">parameterType<span class="pun">=<span class="atv">"Blog"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog where 1 = 1   
    <span class="tag"><choose><span class="pln">  
        <span class="tag"><when<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"title != null"<span class="tag">><span class="pln">  
            and title = #{title}  
        <span class="tag"></when><span class="pln">  
        <span class="tag"><when<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"content != null"<span class="tag">><span class="pln">  
            and content = #{content}  
        <span class="tag"></when><span class="pln">  
        <span class="tag"><otherwise><span class="pln">  
            and owner = "owner1"  
        <span class="tag"></otherwise><span class="pln">  
    <span class="tag"></choose><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

when元素表示当when中的条件满足的时候就输出其中的内容，跟JAVA中的switch效果差不多的是按照条件的顺序，当when中有条件满足的时候，就会跳出choose，即所有的when和otherwise条件中，只有一个会输出，当所有的我很条件都不满足的时候就输出 otherwise中的内容。所以上述语句的意思非常简单，当title!=null的时候就输出and titlte = #{title}，不再往下判断条件，当title为空且content!=null的时候就输出and content = #{content}，当所有条件都不满足的时候就输出otherwise中的内容。

where语句的作用主要是简化SQL语句中where中的条件判断的，先看一个例子，再解释一下where的好处。

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicWhereTest"<span class="pln"> <span class="atn">parameterType<span class="pun">=<span class="atv">"Blog"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog   
    <span class="tag"><where><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"title != null"<span class="tag">><span class="pln">  
            title = #{title}  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"content != null"<span class="tag">><span class="pln">  
            and content = #{content}  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"owner != null"<span class="tag">><span class="pln">  
            and owner = #{owner}  
        <span class="tag"></if><span class="pln">  
    <span class="tag"></where><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

where元素的作用是会在写入where元素的地方输出一个where，另外一个好处是你不需要考虑where元素里面的条件输出是什么样子的，MyBatis会智能的帮你处理，如果所有的条件都不满足那么MyBatis就会查出所有的记录，如果输出后是and 开头的，MyBatis会把第一个and忽略，当然如果是or开头的，MyBatis也会把它忽略；此外，在where元素中你不需要考虑空格的问题，MyBatis会智能的帮你加上。像上述例子中，如果title=null，而content != null，那么输出的整个语句会是select * from t_blog where content = #{content}，而不是select * from t_blog where and content = #{content}，因为MyBatis会智能的把首个and 或 or 给忽略。

trim元素的主要功能是可以在自己包含的内容前加上某些前缀，也可以在其后加上某些后缀，与之对应的属性是prefix和suffix；可以把包含内容的首部某些内容覆盖，即忽略，也可以把尾部的某些内容覆盖，对应的属性是 prefixOverrides和suffixOverrides；正因为trim有这样的功能，所以我们也可以非常简单的利用trim来代替where 元素的功能，示例代码如下：

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicTrimTest"<span class="pln"> <span class="atn">parameterType<span class="pun">=<span class="atv">"Blog"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog   
    <span class="tag"><trim<span class="pln"> <span class="atn">prefix<span class="pun">=<span class="atv">"where"<span class="pln"> <span class="atn">prefixOverrides<span class="pun">=<span class="atv">"and |or"<span class="tag">><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"title != null"<span class="tag">><span class="pln">  
            title = #{title}  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"content != null"<span class="tag">><span class="pln">  
            and content = #{content}  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"owner != null"<span class="tag">><span class="pln">  
            or owner = #{owner}  
        <span class="tag"></if><span class="pln">  
    <span class="tag"></trim><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br><strong>set</strong>元素主要是用在更新操作的时候，它的主要功能和where元素其实是差不多的，主要是在包含的语句前输出一个 set，然后如果包含的语句是以逗号结束的话将会把该逗号忽略，如果set包含的内容为空的话则会出错。有了set元素我们就可以动态的更新那些修改了的 字段。下面是一段示例代码：

<span class="tag"><update<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicSetTest"<span class="pln"> <span class="atn">parameterType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    update t_blog  
    <span class="tag"><set><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"title != null"<span class="tag">><span class="pln">  
            title = #{title},  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"content != null"<span class="tag">><span class="pln">  
            content = #{content},  
        <span class="tag"></if><span class="pln">  
        <span class="tag"><if<span class="pln"> <span class="atn">test<span class="pun">=<span class="atv">"owner != null"<span class="tag">><span class="pln">  
            owner = #{owner}  
        <span class="tag"></if><span class="pln">  
    <span class="tag"></set><span class="pln">  
    where id = #{id}  
<span class="tag"></update><br></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

上述示例代码中，如果set中一个条件都不满足，即set中包含的内容为空的时候就会报错。

foreach的主要用在构建in条件中，它可以在SQL语句中进行迭代一个集合。foreach元素的属性主要有item，index，collection，open，separator，close。item表示集合中每一个元素进行迭代时的别名，index指定一个名字，用于表示在迭代过程中，每次迭代到的位置，open表示该语句以什么开始，separator表示在每次进行迭代之间以什么符号作为分隔符，close表示以什么结束，在使用foreach的时候最关键的也是最容易出错的就是collection属性，该属性是必须指定的，但是在不同情况下，该属性的值是不一样的，主要有一下3种情况：

如果传入的是单参数且参数类型是一个List的时候，collection属性值为list
如果传入的是单参数且参数类型是一个array数组的时候，collection的属性值为array
如果传入的参数是多个的时候，我们就需要把它们封装成一个Map了，当然单参数也可以封装成map，实际上如果你在传入参数的时候，在MyBatis里面也是会把它封装成一个Map的，map的key就是参数名，所以这个时候collection属性值就是传入的List或array对象在自己封装的map里面的key

下面分别来看看上述三种情况的示例代码：

<span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag">1.单参数List的类型：<br></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicForeachTest"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog where id in  
    <span class="tag"><foreach<span class="pln"> <span class="atn">collection<span class="pun">=<span class="atv">"list"<span class="pln"> <span class="atn">index<span class="pun">=<span class="atv">"index"<span class="pln"> <span class="atn">item<span class="pun">=<span class="atv">"item"<span class="pln"> <span class="atn">open<span class="pun">=<span class="atv">"("<span class="pln"> <span class="atn">separator<span class="pun">=<span class="atv">","<span class="pln"> <span class="atn">close<span class="pun">=<span class="atv">")"<span class="tag">><span class="pln">  
        #{item}  
    <span class="tag"></foreach><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br>上述collection的值为list，对应的Mapper是这样的<br><strong><span class="kwd">public<span class="pln"> <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> dynamicForeachTest<span class="pun">(<span class="typ">List<span class="pun"><<span class="typ">Integer<span class="pun">><span class="pln"> ids<span class="pun">);</span></span></span></span></span></span></span></span></span></span></span></span></span></span><br>测试代码：<br></strong>

<span class="lit">@Test<span class="pln">  
<span class="kwd">public<span class="pln"> <span class="kwd">void<span class="pln"> dynamicForeachTest<span class="pun">()<span class="pln"> <span class="pun">{<span class="pln">  
    <span class="typ">SqlSession<span class="pln"> session <span class="pun">=<span class="pln"> <span class="typ">Util<span class="pun">.<span class="pln">getSqlSessionFactory<span class="pun">().<span class="pln">openSession<span class="pun">();<span class="pln">  
    <span class="typ">BlogMapper<span class="pln"> blogMapper <span class="pun">=<span class="pln"> session<span class="pun">.<span class="pln">getMapper<span class="pun">(<span class="typ">BlogMapper<span class="pun">.<span class="kwd">class<span class="pun">);<span class="pln">  
    <span class="typ">List<span class="pun"><<span class="typ">Integer<span class="pun">><span class="pln"> ids <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln"> <span class="typ">ArrayList<span class="pun"><<span class="typ">Integer<span class="pun">>();<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">1<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">3<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">6<span class="pun">);<span class="pln">  
    <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> blogs <span class="pun">=<span class="pln"> blogMapper<span class="pun">.<span class="pln">dynamicForeachTest<span class="pun">(<span class="pln">ids<span class="pun">);<span class="pln">  
    <span class="kwd">for<span class="pln"> <span class="pun">(<span class="typ">Blog<span class="pln"> blog <span class="pun">:<span class="pln"> blogs<span class="pun">)<span class="pln">  
        <span class="typ">System<span class="pun">.<span class="kwd">out<span class="pun">.<span class="pln">println<span class="pun">(<span class="pln">blog<span class="pun">);<span class="pln">  
    session<span class="pun">.<span class="pln">close<span class="pun">();<span class="pln">  
<span class="pun">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>2.单参数array数组的类型：

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicForeach2Test"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog where id in  
    <span class="tag"><foreach<span class="pln"> <span class="atn">collection<span class="pun">=<span class="atv">"array"<span class="pln"> <span class="atn">index<span class="pun">=<span class="atv">"index"<span class="pln"> <span class="atn">item<span class="pun">=<span class="atv">"item"<span class="pln"> <span class="atn">open<span class="pun">=<span class="atv">"("<span class="pln"> <span class="atn">separator<span class="pun">=<span class="atv">","<span class="pln"> <span class="atn">close<span class="pun">=<span class="atv">")"<span class="tag">><span class="pln">  
        #{item}  
    <span class="tag"></foreach><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>上述collection为array，对应的Mapper代码：<br><span class="kwd">public<span class="pln"> <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> dynamicForeach2Test<span class="pun">(<span class="kwd">int<span class="pun">[]<span class="pln"> ids<span class="pun">);</span></span></span></span></span></span></span></span></span></span></span></span><br>对应的测试代码：

<span class="lit">@Test<span class="pln">  
<span class="kwd">public<span class="pln"> <span class="kwd">void<span class="pln"> dynamicForeach2Test<span class="pun">()<span class="pln"> <span class="pun">{<span class="pln">  
    <span class="typ">SqlSession<span class="pln"> session <span class="pun">=<span class="pln"> <span class="typ">Util<span class="pun">.<span class="pln">getSqlSessionFactory<span class="pun">().<span class="pln">openSession<span class="pun">();<span class="pln">  
    <span class="typ">BlogMapper<span class="pln"> blogMapper <span class="pun">=<span class="pln"> session<span class="pun">.<span class="pln">getMapper<span class="pun">(<span class="typ">BlogMapper<span class="pun">.<span class="kwd">class<span class="pun">);<span class="pln">  
    <span class="kwd">int<span class="pun">[]<span class="pln"> ids <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln"> <span class="kwd">int<span class="pun">[]<span class="pln"> <span class="pun">{<span class="lit">1<span class="pun">,<span class="lit">3<span class="pun">,<span class="lit">6<span class="pun">,<span class="lit">9<span class="pun">};<span class="pln">  
    <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> blogs <span class="pun">=<span class="pln"> blogMapper<span class="pun">.<span class="pln">dynamicForeach2Test<span class="pun">(<span class="pln">ids<span class="pun">);<span class="pln">  
    <span class="kwd">for<span class="pln"> <span class="pun">(<span class="typ">Blog<span class="pln"> blog <span class="pun">:<span class="pln"> blogs<span class="pun">)<span class="pln">  
        <span class="typ">System<span class="pun">.<span class="kwd">out<span class="pun">.<span class="pln">println<span class="pun">(<span class="pln">blog<span class="pun">);<span class="pln">  
    session<span class="pun">.<span class="pln">close<span class="pun">();<span class="pln">  
<span class="pun">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>3.自己把参数封装成Map的类型

<span class="tag"><select<span class="pln"> <span class="atn">id<span class="pun">=<span class="atv">"dynamicForeach3Test"<span class="pln"> <span class="atn">resultType<span class="pun">=<span class="atv">"Blog"<span class="tag">><span class="pln">  
    select * from t_blog where title like "%"#{title}"%" and id in  
    <span class="tag"><foreach<span class="pln"> <span class="atn">collection<span class="pun">=<span class="atv">"ids"<span class="pln"> <span class="atn">index<span class="pun">=<span class="atv">"index"<span class="pln"> <span class="atn">item<span class="pun">=<span class="atv">"item"<span class="pln"> <span class="atn">open<span class="pun">=<span class="atv">"("<span class="pln"> <span class="atn">separator<span class="pun">=<span class="atv">","<span class="pln"> <span class="atn">close<span class="pun">=<span class="atv">")"<span class="tag">><span class="pln">  
        #{item}  
    <span class="tag"></foreach><span class="pln">  
<span class="tag"></select></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>上述collection的值为ids，是传入的参数Map的key，对应的Mapper代码：

<span class="kwd">public<span class="pln"> <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> dynamicForeach3Test<span class="pun">(<span class="typ">Map<span class="pun"><<span class="typ">String<span class="pun">,<span class="pln"> <span class="typ">Object<span class="pun">><span class="pln"> <span class="kwd">params<span class="pun">);</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>对应测试代码：

<span class="lit">@Test<span class="pln">  
<span class="kwd">public<span class="pln"> <span class="kwd">void<span class="pln"> dynamicForeach3Test<span class="pun">()<span class="pln"> <span class="pun">{<span class="pln">  
    <span class="typ">SqlSession<span class="pln"> session <span class="pun">=<span class="pln"> <span class="typ">Util<span class="pun">.<span class="pln">getSqlSessionFactory<span class="pun">().<span class="pln">openSession<span class="pun">();<span class="pln">  
    <span class="typ">BlogMapper<span class="pln"> blogMapper <span class="pun">=<span class="pln"> session<span class="pun">.<span class="pln">getMapper<span class="pun">(<span class="typ">BlogMapper<span class="pun">.<span class="kwd">class<span class="pun">);<span class="pln">  
    <span class="kwd">final<span class="pln"> <span class="typ">List<span class="pun"><<span class="typ">Integer<span class="pun">><span class="pln"> ids <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln"> <span class="typ">ArrayList<span class="pun"><<span class="typ">Integer<span class="pun">>();<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">1<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">2<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">3<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">6<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">7<span class="pun">);<span class="pln">  
    ids<span class="pun">.<span class="pln">add<span class="pun">(<span class="lit">9<span class="pun">);<span class="pln">  
    <span class="typ">Map<span class="pun"><<span class="typ">String<span class="pun">,<span class="pln"> <span class="typ">Object<span class="pun">><span class="pln"> <span class="kwd">params<span class="pln"> <span class="pun">=<span class="pln"> <span class="kwd">new<span class="pln"> <span class="typ">HashMap<span class="pun"><<span class="typ">String<span class="pun">,<span class="pln"> <span class="typ">Object<span class="pun">>();<span class="pln">  
    <span class="kwd">params<span class="pun">.<span class="pln">put<span class="pun">(<span class="str">"ids"<span class="pun">,<span class="pln"> ids<span class="pun">);<span class="pln">  
    <span class="kwd">params<span class="pun">.<span class="pln">put<span class="pun">(<span class="str">"title"<span class="pun">,<span class="pln"> <span class="str">"中国"<span class="pun">);<span class="pln">  
    <span class="typ">List<span class="pun"><<span class="typ">Blog<span class="pun">><span class="pln"> blogs <span class="pun">=<span class="pln"> blogMapper<span class="pun">.<span class="pln">dynamicForeach3Test<span class="pun">(<span class="kwd">params<span class="pun">);<span class="pln">  
    <span class="kwd">for<span class="pln"> <span class="pun">(<span class="typ">Blog<span class="pln"> blog <span class="pun">:<span class="pln"> blogs<span class="pun">)<span class="pln">  
        <span class="typ">System<span class="pun">.<span class="kwd">out<span class="pun">.<span class="pln">println<span class="pun">(<span class="pln">blog<span class="pun">);<span class="pln">  
    session<span class="pun">.<span class="pln">close<span class="pun">();<span class="pln">  
<span class="pun">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><br>

<span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="atn"><span class="pun"><span class="atv"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"><span class="pln"><span class="tag"> </span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

MyBatis动态SQL详解

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MyBatis动态SQL详解

人气教程排行