select id, user_id, group_id from sys_agent
insert into sys_agent
user_id,group_id,#{userId},#{groupId},
update sys_agent
user_id = #{userId},group_id = #{groupId},
where id = #{id}
delete from sys_agent where id = #{id}
delete from sys_agent where id in
#{id}
delete from sys_agent
and user_id = #{userId} and group_id = #{groupId}