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="http://www.mamicode.com/‘%‘ + _parameter.username + ‘%‘" />  select id,sex,age,username,password   from person  where username LIKE #{pattern}</select>

3. CONCAT

where username LIKE CONCAT(‘%‘,‘username‘,‘%‘)---mysql数据库

where username LIKE CONCAT(‘%‘,CONCAT(#{name},‘%‘)) ---oracle

mybatis 模糊查询 like