delete from user where user_id=? and name=?
http://ask.csdn.net/questions/201580
delete FROM 表 WHERE 1 = 1
<if test="user.id != 0">
and id like concat('%',concat(#{user.id},'%') )
</if>
<if test="user.appid != null">
and appid like concat('%',concat(#{user.appid},'%') )
</if>
<if test="user.channel != null">
and channel = #{user.channel}
</if>
不知道你说的是不是这个,,,,
这个好像不是很难的把?关联好像比较难