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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
1 2 3 4 5 6 | <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
1 2 3 4 5 6 7 8 9 10 | <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
1 2 3 4 5 6 7 8 9 10 11 12 | <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?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <!-- 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <!-- 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:
1 2 3 4 5 6 7 8 9 | <!-- 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
1 2 3 4 5 6 7 8 | <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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | //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)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <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。
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<div class="postDesc">posted @ <span id="post-date">2017-08-09 09:03</span> <a href="https://www.cnblogs.com/ysocean/">YSOcean</a> 阅读(<span id="post_view_count">49263</span>) 评论(<span id="post_comment_count">9</span>) <a href="https://i.cnblogs.com/EditPosts.aspx?postid=7289529" rel="nofollow">编辑</a> <a href="#" onclick="AddToWz(7289529);return false;">收藏</a></div>
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<a href="#3753751" class="layer">#1楼</a><a name="3753751" id="comment_anchor_3753751"></a> <span class="comment_date">2017-08-09 14:27</span> <a id="a_comment_author_3753751" href="https://www.cnblogs.com/PPBoy/" target="_blank">PPBoy</a> <a href="http://msg.cnblogs.com/send/PPBoy" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3753751" class="blog_comment_body">写的不错啊,启蒙教材。</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3753751,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3753751,'Bury',this)">反对(0)</a></div>
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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"> </a>
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<div id="comment_body_3753906" class="blog_comment_body">不错</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3753906,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3753906,'Bury',this)">反对(0)</a></div>
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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"> </a>
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<div id="comment_body_3901335" class="blog_comment_body">学习了,收获很大</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3901335,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3901335,'Bury',this)">反对(0)</a></div>
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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"> </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<script>, <CDATA>的作用是什么,求解答<br> "<script>" +<br> "SELECT id,sn,user_id,<br> "FROM oilcard "+<br> "<where>" +<br> "<if test="createdStart !=null "> and created <![CDATA[ > ]]> #{createdStart}</if>" +<br> "<if test="createdEnd !=null "> and created <![CDATA[ < ]]> #{createdEnd}</if>" +<br> "</where>" +<br> "order by order_time desc " +<br> "</script>"</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"> </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"> </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<script>也是防止转义,<CDATA>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<script>,<CDATA>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"> </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"> </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"> </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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