Mybatis SQL转义字符与like 查询
Mybatis Sql语句里一些特殊符号是必须转义的，否则无法正常运行，有些会在静态语法检查上IDE会提示，有些则只会在运行时抛出异常。需要转义的符号如下
< <
> >
<> <>
& &
' '
" "
<sql id="getAllWhere">
<if test="condition != null">
<if test="condition.type >0">
<!-- 歌手类别 -->
and g.type = #{condition.type}
</if>
<if test="condition.mediaName != null">
<!-- 歌名汉字 ，下面三种写法都可以-->
and media_name like '%${condition.mediaName}%'
<!-- and media_name like '%${condition.mediaName}%' -->
<!-- and media_name like CONCAT(CONCAT('%',#{condition.mediaName}),'%') -->
</if>
<if test="condition.geQuLeng > 0">
<!-- 歌名字数，UTF-8一个汉字的长度为3 -->
<if test="condition.geQuLeng > 9"> and length(media_name) >= #{condition.geQuLeng} </if>
<if test="condition.geQuLeng < 10"> and length(media_name) = #{condition.geQuLeng} </if>
</if>
</if>
<!-- 时间排序 -->
<if test="sort != null ">
<if test="order != null"> order by #{sort} #{order} </if>
<if test="order == null"> order by #{sort} desc </if>
</if>
</sql>
