Mybatis中的like模糊查询四种方式

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}),'%')

4. “%”#{username}“%”

where username LIKE  “%”#{username}“%”