1.無主外鍵級聯刪除,主表(tb_userinfo)用戶表
<!--刪除用戶那麼與之用戶相關聯的所有信息都將被刪除。根據用戶的unionid刪除所有相關數據 -->
<delete id="deleteUserinfoByid">
DELETE
tb_userinfo,
tb_attention,
tb_building,
tb_code,
tb_collection,
tb_information,
tb_recommend,
tb_records,
tb_forum
FROM
tb_userinfo
LEFT JOIN tb_attention ON (tb_userinfo.unionid = tb_attention.unionids)
LEFT JOIN tb_building ON (tb_userinfo.account = tb_building.account)
LEFT JOIN tb_code ON (tb_userinfo.unionid = tb_code.unionid)
LEFT JOIN tb_collection ON (tb_userinfo.unionid = tb_collection.unionid OR tb_building.id = tb_collection.bid)
LEFT JOIN tb_information ON (tb_userinfo.unionid = tb_information.unionid)
LEFT JOIN tb_recommend ON (tb_userinfo.unionid = tb_recommend.unionid)
LEFT JOIN tb_records ON (tb_userinfo.unionid = tb_records.unionid)
LEFT JOIN tb_forum ON (tb_userinfo.unionid = tb_forum.unionid)
WHERE
tb_userinfo.unionid = #{unionid}<!--條件,傳入的參數 -->
</delete>
2,無主外鍵級聯更新,主表(tb_userinfo)用戶表
UPDATE tb_userinfo u
LEFT JOIN tb_borrow b ON (u.id = b.bid)<!-- 關聯條件爲用戶ID -->
LEFT JOIN tb_borrow o ON (u.id = o.leid)
LEFT JOIN tb_credit c ON (u.id = c.userid)
LEFT JOIN tb_friend f ON (u.id = f.bid)
LEFT JOIN tb_receipt r ON (u.id = r.userid)
SET u.username = #{username},<!--用戶名 -->
b.borrower = u.username,
b.identitycard=u.identitycard,
o.lender = u.username,
o.identitycards=u.identitycard,
c.username=u.username,
f.username=u.username,
r.username=u.username
WHERE
u.id = #{id}<!-- 根據用戶id -->