id,item_id,user_id #{id},#{itemId},#{userId} item_id = #{itemId}, user_id = #{userId}, and id = #{id} and item_id = #{itemId} and user_id = #{userId} insert into sc( ) values( ) delete from sc where id=#{id} delete from sc where 1=1 delete from sc where 1=1 update sc where 1=1 update sc where id=#{id} select from sc where 1=1 select from sc select from sc where 1=1 select from sc where id=#{id} select from sc where id=#{id} select from sc where 1=1 select from sc where 1=1 select from sc where 1=1 select from sc where 1=1 insert into sc( ) values (#{item.item_id},#{item.user_id}) update sc item_id = #{item.itemId}, user_id = #{item.userId}, where 1=1 and id = #{item.id} ${sql} ${sql} ${sql} ${sql} ${sql} ${sql} ${sql}