mybatis做like模糊查询

引言

mybatis是一个很好用的持久化框架，允许我们自己写一些复杂的sql，下面我们来说一下当我们要用like关键字进行模糊查询的时候的几种写法。

1、参数中直接加入%%

param.setUsername("%CD%");      param.setPassword("%11%");<select  id="selectPersons" resultType="person" parameterType="person">select id,sex,age,username,password from person where true <if test="username!=null"> AND username LIKE #{username}</if><if test="password!=null">AND password LIKE #{password}</if></select>

2 、bind标签

<select id="selectPersons" resultType="person" parameterType="person">  <bind name="pattern" value="'%' + _parameter.username + '%'" />  select id,sex,age,username,password   from person  where username LIKE #{pattern}</select>

3、CONCAT

where username LIKE concat(concat('%',#{username}),'%')