【转载】 mybatis入门系列四之动态SQL

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mybatis 详解(五)------动态SQL


  前面几篇博客我们通过实例讲解了用mybatis对一张表进行的CRUD操作,但是我们发现写的 SQL 语句都比较简单,如果有比较复杂的业务,我们需要写复杂的 SQL 语句,往往需要拼接,而拼接 SQL ,稍微不注意,由于引号,空格等缺失可能都会导致错误。

  那么怎么去解决这个问题呢?这就是本篇所讲的使用 mybatis 动态SQL,通过 if, choose, when, otherwise, trim, where, set, foreach等标签,可组合成非常灵活的SQL语句,从而在提高 SQL 语句的准确性的同时,也大大提高了开发人员的效率。

  我们以 User 表为例来说明:

  

1、动态SQL:if 语句

  根据 username 和 sex 来查询数据。如果username为空,那么将只根据sex来查询;反之只根据username来查询

  首先不使用 动态SQL 来书写

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<select id="selectUserByUsernameAndSex"
        resultType="user" parameterType="com.ys.po.User">
    <!-- 这里和普通的sql 查询语句差不多,对于只有一个参数,后面的 #{id}表示占位符,里面不一定要写id,
            写啥都可以,但是不要空着,如果有多个参数则必须写pojo类里面的属性 -->
    select * from user where username=#{username} and sex=#{sex}
</select>

  

  上面的查询语句,我们可以发现,如果 #{username} 为空,那么查询结果也是空,如何解决这个问题呢?使用 if 来判断

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<select id="selectUserByUsernameAndSex" resultType="user" parameterType="com.ys.po.User">
    select * from user where
        <if test="username != null">
           username=#{username}
        </if>
         
        <if test="username != null">
           and sex=#{sex}
        </if>
</select>

  这样写我们可以看到,如果 sex 等于 null,那么查询语句为 select * from user where username=#{username},但是如果usename 为空呢?那么查询语句为 select * from user where and sex=#{sex},这是错误的 SQL 语句,如何解决呢?请看下面的 where 语句

2、动态SQL:if+where 语句

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<select id="selectUserByUsernameAndSex" resultType="user" parameterType="com.ys.po.User">
    select * from user
    <where>
        <if test="username != null">
           username=#{username}
        </if>
         
        <if test="username != null">
           and sex=#{sex}
        </if>
    </where>
</select>

  这个“where”标签会知道如果它包含的标签中有返回值的话,它就插入一个‘where’。此外,如果标签返回的内容是以AND 或OR 开头的,则它会剔除掉。

  

3、动态SQL:if+set 语句

  同理,上面的对于查询 SQL 语句包含 where 关键字,如果在进行更新操作的时候,含有 set 关键词,我们怎么处理呢?

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<!-- 根据 id 更新 user 表的数据 -->
<update id="updateUserById" parameterType="com.ys.po.User">
    update user u
        <set>
            <if test="username != null and username != ''">
                u.username = #{username},
            </if>
            <if test="sex != null and sex != ''">
                u.sex = #{sex}
            </if>
        </set>
     
     where id=#{id}
</update>

  这样写,如果第一个条件 username 为空,那么 sql 语句为:update user u set u.sex=? where id=?

      如果第一个条件不为空,那么 sql 语句为:update user u set u.username = ? ,u.sex = ? where id=?

4、动态SQL:choose(when,otherwise) 语句

  有时候,我们不想用到所有的查询条件,只想选择其中的一个,查询条件有一个满足即可,使用 choose 标签可以解决此类问题,类似于 Java 的 switch 语句

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<select id="selectUserByChoose" resultType="com.ys.po.User" parameterType="com.ys.po.User">
      select * from user
      <where>
          <choose>
              <when test="id !='' and id != null">
                  id=#{id}
              </when>
              <when test="username !='' and username != null">
                  and username=#{username}
              </when>
              <otherwise>
                  and sex=#{sex}
              </otherwise>
          </choose>
      </where>
  </select>

  也就是说,这里我们有三个条件,id,username,sex,只能选择一个作为查询条件

    如果 id 不为空,那么查询语句为:select * from user where  id=?

    如果 id 为空,那么看username 是否为空,如果不为空,那么语句为 select * from user where  username=?;

          如果 username 为空,那么查询语句为 select * from user where sex=?

  

5、动态SQL:trim 语句

  trim标记是一个格式化的标记,可以完成set或者是where标记的功能

  ①、用 trim 改写上面第二点的 if+where 语句

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<select id="selectUserByUsernameAndSex" resultType="user" parameterType="com.ys.po.User">
        select * from user
        <!-- <where>
            <if test="username != null">
               username=#{username}
            </if>
             
            <if test="username != null">
               and sex=#{sex}
            </if>
        </where>  -->
        <trim prefix="where" prefixOverrides="and | or">
            <if test="username != null">
               and username=#{username}
            </if>
            <if test="sex != null">
               and sex=#{sex}
            </if>
        </trim>
    </select>

  prefix:前缀      

  prefixoverride:去掉第一个and或者是or

  ②、用 trim 改写上面第三点的 if+set 语句

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<!-- 根据 id 更新 user 表的数据 -->
    <update id="updateUserById" parameterType="com.ys.po.User">
        update user u
            <!-- <set>
                <if test="username != null and username != ''">
                    u.username = #{username},
                </if>
                <if test="sex != null and sex != ''">
                    u.sex = #{sex}
                </if>
            </set> -->
            <trim prefix="set" suffixOverrides=",">
                <if test="username != null and username != ''">
                    u.username = #{username},
                </if>
                <if test="sex != null and sex != ''">
                    u.sex = #{sex},
                </if>
            </trim>
         
         where id=#{id}
    </update>

  suffix:后缀  

  suffixoverride:去掉最后一个逗号(也可以是其他的标记,就像是上面前缀中的and一样)

6、动态SQL: SQL 片段

  有时候可能某个 sql 语句我们用的特别多,为了增加代码的重用性,简化代码,我们需要将这些代码抽取出来,然后使用时直接调用。

  比如:假如我们需要经常根据用户名和性别来进行联合查询,那么我们就把这个代码抽取出来,如下:

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<!-- 定义 sql 片段 -->
<sql id="selectUserByUserNameAndSexSQL">
    <if test="username != null and username != ''">
        AND username = #{username}
    </if>
    <if test="sex != null and sex != ''">
        AND sex = #{sex}
    </if>
</sql>

  引用 sql 片段

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<select id="selectUserByUsernameAndSex" resultType="user" parameterType="com.ys.po.User">
    select * from user
    <trim prefix="where" prefixOverrides="and | or">
        <!-- 引用 sql 片段,如果refid 指定的不在本文件中,那么需要在前面加上 namespace -->
        <include refid="selectUserByUserNameAndSexSQL"></include>
        <!-- 在这里还可以引用其他的 sql 片段 -->
    </trim>
</select>

  注意:①、最好基于 单表来定义 sql 片段,提高片段的可重用性

     ②、在 sql 片段中不要包括 where 

    

7、动态SQL: foreach 语句

  需求:我们需要查询 user 表中 id 分别为1,2,3的用户

  sql语句:select * from user where id=1 or id=2 or id=3

       select * from user where id in (1,2,3)

①、建立一个 UserVo 类,里面封装一个 List<Integer> ids 的属性

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package com.ys.vo;
 
import java.util.List;
 
public class UserVo {
    //封装多个用户的id
    private List<Integer> ids;
 
    public List<Integer> getIds() {
        return ids;
    }
 
    public void setIds(List<Integer> ids) {
        this.ids = ids;
    }
 
}  

②、我们用 foreach 来改写 select * from user where id=1 or id=2 or id=3

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<select id="selectUserByListId" parameterType="com.ys.vo.UserVo" resultType="com.ys.po.User">
    select * from user
    <where>
        <!--
            collection:指定输入对象中的集合属性
            item:每次遍历生成的对象
            open:开始遍历时的拼接字符串
            close:结束时拼接的字符串
            separator:遍历对象之间需要拼接的字符串
            select * from user where 1=1 and (id=1 or id=2 or id=3)
          -->
        <foreach collection="ids" item="id" open="and (" close=")" separator="or">
            id=#{id}
        </foreach>
    </where>
</select>

  测试:

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//根据id集合查询user表数据
@Test
public void testSelectUserByListId(){
    String statement = "com.ys.po.userMapper.selectUserByListId";
    UserVo uv = new UserVo();
    List<Integer> ids = new ArrayList<>();
    ids.add(1);
    ids.add(2);
    ids.add(3);
    uv.setIds(ids);
    List<User> listUser = session.selectList(statement, uv);
    for(User u : listUser){
        System.out.println(u);
    }
    session.close();
}

  

③、我们用 foreach 来改写 select * from user where id in (1,2,3)

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<select id="selectUserByListId" parameterType="com.ys.vo.UserVo" resultType="com.ys.po.User">
        select * from user
        <where>
            <!--
                collection:指定输入对象中的集合属性
                item:每次遍历生成的对象
                open:开始遍历时的拼接字符串
                close:结束时拼接的字符串
                separator:遍历对象之间需要拼接的字符串
                select * from user where 1=1 and id in (1,2,3)
              -->
            <foreach collection="ids" item="id" open="and id in (" close=") " separator=",">
                #{id}
            </foreach>
        </where>
    </select>

  

8、总结

  其实动态 sql 语句的编写往往就是一个拼接的问题,为了保证拼接准确,我们最好首先要写原生的 sql 语句出来,然后在通过 mybatis 动态sql 对照着改,防止出错。

  

作者:YSOcean
本文版权归作者所有,欢迎转载,但未经作者同意不能转载,否则保留追究法律责任的权利。
分类: JavaWeb
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			<a href="#3753906" class="layer">#2楼</a><a name="3753906" id="comment_anchor_3753906"></a>  <span class="comment_date">2017-08-09 16:20</span> <a id="a_comment_author_3753906" href="http://home.cnblogs.com/u/1212960/" target="_blank">晃悠人生</a> <a href="http://msg.cnblogs.com/send/%E6%99%83%E6%82%A0%E4%BA%BA%E7%94%9F" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<a href="#3901335" class="layer">#3楼</a><a name="3901335" id="comment_anchor_3901335"></a>  <span class="comment_date">2018-01-31 17:57</span> <a id="a_comment_author_3901335" href="http://home.cnblogs.com/u/1326862/" target="_blank">壹个菜鸟</a> <a href="http://msg.cnblogs.com/send/%E5%A3%B9%E4%B8%AA%E8%8F%9C%E9%B8%9F" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<a href="#3989996" class="layer">#4楼</a><a name="3989996" id="comment_anchor_3989996"></a>  <span class="comment_date">2018-06-04 16:04</span> <a id="a_comment_author_3989996" href="https://www.cnblogs.com/prayjourney/" target="_blank">带妳心菲</a> <a href="http://msg.cnblogs.com/send/%E5%B8%A6%E5%A6%B3%E5%BF%83%E8%8F%B2" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<div id="comment_body_3989996" class="blog_comment_body">写的很不错,有个疑问问一下,如下的&lt;script&gt;, &lt;CDATA&gt;的作用是什么,求解答<br>           "&lt;script&gt;" +<br>            "SELECT id,sn,user_id,<br>            "FROM oilcard "+<br>            "&lt;where&gt;" +<br>            "&lt;if test="createdStart !=null "&gt; and created &lt;![CDATA[ &gt; ]]&gt; #{createdStart}&lt;/if&gt;" +<br>            "&lt;if test="createdEnd !=null "&gt; and created &lt;![CDATA[ &lt; ]]&gt; #{createdEnd}&lt;/if&gt;" +<br>            "&lt;/where&gt;" +<br>            "order by order_time desc " +<br>            "&lt;/script&gt;"</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3989996,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3989996,'Bury',this)">反对(0)</a></div><span id="comment_3989996_avatar" style="display:none;">http://pic.cnblogs.com/face/637525/20150826135046.png</span>
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			<a href="#3990433" class="layer">#5楼</a><a name="3990433" id="comment_anchor_3990433"></a>[<span class="louzhu">楼主</span>]  <span class="comment_date">2018-06-05 09:19</span> <a id="a_comment_author_3990433" href="https://www.cnblogs.com/ysocean/" target="_blank">YSOcean</a> <a href="http://msg.cnblogs.com/send/YSOcean" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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带妳心菲
sql中有一些特殊的字符的话,在解析xml文件的时候会被转义,<CDATA>能避免被转义。
<script>这个标签到是没用过



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			<a href="#3990471" class="layer">#6楼</a><a name="3990471" id="comment_anchor_3990471"></a>  <span class="comment_date">2018-06-05 09:46</span> <a id="a_comment_author_3990471" href="https://www.cnblogs.com/prayjourney/" target="_blank">带妳心菲</a> <a href="http://msg.cnblogs.com/send/%E5%B8%A6%E5%A6%B3%E5%BF%83%E8%8F%B2" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<div id="comment_body_3990471" class="blog_comment_body">嗯嗯,多谢了,之前问过其他人,说&lt;script&gt;也是防止转义,&lt;CDATA&gt;倒是没有使用过,看来作用是一样的,但是感觉这样写很麻烦,一般使用注解在Mapper接口之中写SQL貌似也不需要这些&lt;script&gt;,&lt;CDATA&gt;吧</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3990471,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3990471,'Bury',this)">反对(0)</a></div><span id="comment_3990471_avatar" style="display:none;">http://pic.cnblogs.com/face/637525/20150826135046.png</span>
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			<a href="#4089902" class="layer">#7楼</a><a name="4089902" id="comment_anchor_4089902"></a>  <span class="comment_date">2018-10-15 14:51</span> <a id="a_comment_author_4089902" href="https://www.cnblogs.com/zuoxh/" target="_blank">帅的很耗cpu</a> <a href="http://msg.cnblogs.com/send/%E5%B8%85%E7%9A%84%E5%BE%88%E8%80%97cpu" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<div id="comment_body_4089902" class="blog_comment_body">多谢博主</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(4089902,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(4089902,'Bury',this)">反对(0)</a></div><span id="comment_4089902_avatar" style="display:none;">http://pic.cnblogs.com/face/1493070/20180929145724.png</span>
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			<a href="#4154107" class="layer">#8楼</a><a name="4154107" id="comment_anchor_4154107"></a>  <span class="comment_date">2019-01-02 20:14</span> <a id="a_comment_author_4154107" href="https://www.cnblogs.com/AdaiCoffee/" target="_blank">一杯热咖啡AAA</a> <a href="http://msg.cnblogs.com/send/%E4%B8%80%E6%9D%AF%E7%83%AD%E5%92%96%E5%95%A1AAA" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<div id="comment_body_4154107" class="blog_comment_body">师傅,看你一篇博客当看别人几篇博客,讲的真的很好,我要把你的博客看完!</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(4154107,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(4154107,'Bury',this)">反对(0)</a></div>
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			<a href="#4197935" class="layer">#9楼</a><a name="4197935" id="comment_anchor_4197935"></a><span id="comment-maxId" style="display:none;">4197935</span><span id="comment-maxDate" style="display:none;">2019/3/10 0:00:03</span>  <span class="comment_date">2019-03-10 00:00</span> <a id="a_comment_author_4197935" href="http://home.cnblogs.com/u/1460929/" target="_blank">一只小狼</a> <a href="http://msg.cnblogs.com/send/%E4%B8%80%E5%8F%AA%E5%B0%8F%E7%8B%BC" title="发送站内短消息" class="sendMsg2This">&nbsp;</a>
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			<div id="comment_body_4197935" class="blog_comment_body">真心不错,系统全面,清晰易懂,感觉跟教科书级别的一样!</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(4197935,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(4197935,'Bury',this)">反对(0)</a></div>
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原文地址:https://www.cnblogs.com/huanglf714/p/10782893.html