mybatis做like模糊查询

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}),'%')