我编写了一个以 CUSTOMER_ID 作为输入的过程。然后该过程从表 CUSTOMERS 中删除相应的客户。
CREATE OR REPlACE PROCEDURE DELETE_CUSTOMER
(CUSTOMER_ID NUMBER) AS
TOT_CUSTOMERS NUMBER;
BEGIN
DELETE FROM CUSTOMERS
WHERE CUSTOMERS.CUSTOMER_ID = DELETE_CUSTOMER.CUSTOMER_ID;
TOT_CUSTOMERS := TOT_CUSTOMERS - 1;
END;
/
我必须执行删除 id 为 1 的客户的过程。
EXECUTE DELETE_CUSTOMER(01);
当我这样做时,我收到一个错误
Error starting at line : 120 in command -
BEGIN DELETE_CUSTOMER(01); END;
Error report -
ORA-02292: integrity constraint (TUG81959.ORDERS_FK_CUSTOMERS) violated - child record found
ORA-06512: at "TUG81959.DELETE_CUSTOMER", line 5
ORA-06512: at line 1
02292. 00000 - "integrity constraint (%s.%s) violated - child record found"
*Cause: attempted to delete a parent key value that had a foreign
dependency.
*Action: delete dependencies first then parent or disable constraint.
我知道这是因为ORDERS表上有一个CUSTOMER_ID的外键,这意味着客户不能被删除,因为他已经下了订单。 如何编写代码,以便我可以先删除相应的 ORDER_DETAILS,然后删除相应的 ORDERS,以便最终能够从 CUSTOMERS 中删除一条记录?
我尝试重写代码,但我现在迷失了:
CREATE OR REPlACE PROCEDURE DELETE_CUSTOMER
(CUSTOMER_ID_IN NUMBER) AS
TOT_CUSTOMERS NUMBER;
CURSOR C1 IS
DELETE FROM ORDERS
WHERE ORDERS.ORDER_ID = CUSTOMER_ID.ORDER_ID;
CURSOR C2 IS
DELETE FROM ORDER_DETAILS
WHERE ORDER_DETAILS.ORDER_ID = CUSTOMER_ID.ORDER_ID;
CURSOR C3 IS
DELETE FROM CUSTOMERS
WHERE CUSTOMERS.CUSTOMER_ID = DELETE_CUSTOMER.CUSTOMER_ID;
BEGIN
OPEN C1;
OPEN C2;
OPEN C3;
IF C1%FOUND AND C2%FOUND AND C3%FOUND
THEN TOT_CUSTOMERS := TOT_CUSTOMERS - 1;
END IF;
CLOSE C1;
CLOSE C2;
CLOSE C3;
END;
/
最佳答案
有两种方法可以实现此目的:
<小时/>You may use cascade on delete ( drop&create again ) :
drop constraint order_details_fk_orders;
alter table order_details add constraint order_details_fk_orders
foreign key(order_id) references orders(order_id)
on delete cascade;
delete orders where customer_id = &i_cust_id;
或
<小时/>You may delete your detail records first :
按照以下步骤:
CREATE OR REPLACE PROCEDURE PR_DELETE_CUSTOMER(
I_CUSTOMER_ID orders.customer_id%type,
O_TOT_CUSTOMERS out number
) IS
BEGIN
delete order_details where order_id in ( select order_id from orders where customer_id = I_CUSTOMER_ID );
delete orders where customer_id = I_CUSTOMER_ID;
delete customers where customer_id = I_CUSTOMER_ID;
select count(1) into O_TOT_CUSTOMERS from orders;
END;
然后
var v_tot_customers number;
execute pr_delete_customer(1,:v_tot_customers);
print v_tot_customers;
关于oracle - ORA-02292: 违反完整性约束 - 在 ORACLE SQL Developer 中创建过程时发现子记录?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46869873/