mybatis+pagehelper like搜索报错 因为%%

<select id="searchByName" parameterType="com.mpn.model.TUser" resultMap="BaseResultMapRolename">
		Select u.*,r.RoleName 
		From t_user u 
		Left Join t_role r On u.UserRold = r.RoleId
		Where u.UserIsEnabled = 1
		<if test="userName != null">
			and u.username like '%#{userName,jdbcType=VARCHAR}%'
		</if>
	</select>

查找资料发现因为%%导致出错把它提到外面直接传参带%%

//like搜索条件加入
		String likestring="%"+tUser.getUserName()+"%";
		tUser.setUserName(likestring);