Mybatis中的like模糊查询功能

　　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>

<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>

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