我正在写一个Postgres函数,它应该从3个表中连续删除。如何检查表中的元素是否存在?
该关系从mobgroupdata - > mobilenums - >终端中删除,当我在mobgroupdata中没有元素时,我想从mobilenums中删除,然后从终端中删除。但是,应该是什么条件。我试过
IF mRec.id != 0
,但它没有工作,比我试过exists
,它也没有工作。另外,当我从数据库中创建我的select
声明并且mobgroupdata的id不存在时,代码就会中断,但是当我选择它包含在所有表中的元素时,它就会工作。是否有人知道应该如何使if语句有效?
CREATE OR REPLACE FUNCTION "Delete_From_Terminals_Casc_final12"(
"Id_list" bigint,
"Curuser_id" bigint)
RETURNS SETOF term_mgd_mobnums AS
$BODY$
declare
mRec "term_mgd_mobnums"%ROWTYPE;
BEGIN
for mRec in select mn."id_terminals", t.sn , t.imei ,t.les ,t.category ,t.model ,t.tswv ,t.status ,t.activation_date ,t.deactivation_date ,t.paytype ,t.ip_address ,t.pin1 ,t.pin2 ,t.puk1 ,t.puk2 ,t.notes ,t.units ,t.validtill, t.responsible_user,t.id_clients,t.currentuser, t.isn,
md.id_mobilenums, mn.current_status, mn.start_date ,mn.streason ,mn.unit ,mn.mobnumber ,mn.service ,mn.status as mn_status,mn.activator ,mn.responsible_department,mn.date_changed ,mn.reason ,mn.installed_on ,mn.usedby ,mn.regnumber ,mn.responsible_user as mn_responsible_user ,mn.description,
md.id,md.les1 ,md.les2,md.les3,md.les4,md.les5,md.member1 ,md.member2,md.member3,md.member4,md.member5,md.user1 ,md.user2,md.user3,md.user4,md.user5,md.pass1 ,md.pass2,md.pass3,md.pass4,md.pass5 from terminals t
inner join mobilenums mn on t."id" = mn."id_terminals"
inner join mobgroupdata md on md."id_mobilenums" = mn."id"
where mn."id_terminals" = $1
loop
IF exists THEN
PERFORM "Delete_From_Mobgroupdata2"(mRec.id,$2);
PERFORM "Delete_From_Mobilenums"(mRec.id_mobilenums::text,$2);
PERFORM "Delete_From_Terminals"(mRec.id_terminals::text,$2);
ELSE
PERFORM "Delete_From_Mobilenums"(mRec.id_mobilenums::text,$2);
PERFORM "Delete_From_Terminals"(mRec.id_terminals::text,$2);
END IF;
RETURN NEXT mRec;
end loop;
return;
end;$BODY$
LANGUAGE plpgsql VOLATILE
COST 100
ROWS 1000;
ALTER FUNCTION "Delete_From_Terminals_Casc_final12"(bigint, bigint)
OWNER TO postgres;
这可以优雅地解决,但我不清楚精确的算法应该是什么。如果你能澄清这个问题,你一定会得到答案。 –