select id,name from tag where id = #{id} insert into tag values (#{id},#{name}); select * from tag select t.id tid, t.name, b.id bid, b.title from tag t, forum b, forum_tags bt where t.id = bt.tag_id and b.id = bt.forum_id select * from tag where name = #{name} select * from tag where id = #{id} select count(*) from tag delete from tag where id = #{id} update tag set name = #{name} where id = #{id};