Oracle支持可为空字端的唯一约束呢?下面就是用触发器作出的限制语句,仅供参考:
CREATE OR REPLACE TRIGGER Tg_Completion_Test
BEFORE INSERT OR UPDATE ON bz_funds_voucher
FOR EACH ROW --行触发,没有本行则为语句级触发
DECLARE
Too_Many EXCEPTION;
PRAGMA EXCEPTION_INIT(Too_Many, -20001);
v_Exist_Count NUMBER := 0;
BEGIN
Select Count(*)
Into v_Exist_Count
From bz_funds_voucher t
Where t.document_code is not null
and t.territory_code = :new.territory_code
and t.document_code = :new.document_code ;
If v_Exist_Count > 0 Then
Raise_Application_Error(-20001, '数据重复存储!');
End If;
End;
CREATE OR REPLACE TRIGGER Tg_Bz_rent_payment_voucher
BEFORE INSERT OR UPDATE ON bz_rent_payment_voucher
FOR EACH ROW --行触发,没有本行则为语句级触发
DECLARE
Too_Many EXCEPTION;
PRAGMA EXCEPTION_INIT(Too_Many, -20002);
v_Exist_Count NUMBER := 0;
BEGIN
Select Count(*)
Into v_Exist_Count
From bz_rent_payment_voucher t
Where
t.collection_way not in ('转款', '优惠活动')
and t.create_date > to_date('2015-01-01', 'yyyy-mm-dd')
and t.serial_no is not null
and t.reserve_code is null
and t.serial_no = :new.serial_no ;
If v_Exist_Count > 0 Then
Raise_Application_Error(-20002, '同一流水收款单重复存储!');
End If;
End;