我想编写禁用和启用 Foriegn KEY 约束的脚本。
我正在使用以下设置进行测试。正如您从下面看到的那样,我能够成功禁用约束,但我似乎无法使启用部分工作,因为它没有显示任何输出。
下面是我的测试案例和一些示例数据。
CREATE TABLE customers
(CUSTOMER_ID, FIRST_NAME, LAST_NAME) AS
SELECT 1, 'Faith', 'Mazzarone' FROM DUAL UNION ALL
SELECT 2, 'Lisa', 'Saladino' FROM DUAL UNION ALL
SELECT 3, 'Micheal', 'Palmice' FROM DUAL UNION ALL
SELECT 4, 'Joseph', 'Zaza' FROM DUAL UNION ALL
SELECT 5, 'Jerry', 'Torchiano' FROM DUAL;
ALTER TABLE customers
ADD CONSTRAINT customers_pk PRIMARY KEY (customer_id);
CREATE TABLE items
(PRODUCT_ID, PRODUCT_NAME, PRICE) AS
SELECT 100, 'Black Shoes', 79.99 FROM DUAL UNION ALL
SELECT 101, 'Brown Pants', 111.99 FROM DUAL UNION ALL
SELECT 102, 'White Shirt', 10.99 FROM DUAL;
ALTER TABLE items
ADD CONSTRAINT items_pk PRIMARY KEY (product_id);
create table purchases(
ORDER_ID NUMBER GENERATED BY DEFAULT AS IDENTITY (START WITH 1) NOT NULL,
customer_id number,
PRODUCT_ID NUMBER,
QUANTITY NUMBER,
purchase_date timestamp
);
ALTER TABLE purchases
ADD CONSTRAINT order_pk PRIMARY KEY (order_id);
ALTER TABLE purchases ADD CONSTRAINT customers_fk FOREIGN KEY (customer_id) REFERENCES customers(customer_id);
ALTER TABLE purchases ADD CONSTRAINT items_fk FOREIGN KEY (PRODUCT_ID) REFERENCES items(product_id);
insert into purchases (customer_id, product_id, quantity, purchase_date)
SELECT 3, 102, 4,TIMESTAMP '2022-12-22 21:44:35' + NUMTODSINTERVAL ( LEVEL * 2, 'DAY') FROM dual
CONNECT BY LEVEL <= 15 UNION ALL
select 1, 101,3, date '2023-03-29' + level * interval '2' day from dual
connect by level <= 12
union all
select 2, 101,2, date '2023-01-15' + level * interval '8' hour from dual
connect by level <= 15
union all
select 2, 102,2,date '2023-04-13' + level * interval '1 1' day to hour from dual
connect by level <= 11
union all
select 3, 101,2, date '2023-02-01' + level * interval '1 05:03' day to minute from dual
connect by level <= 10
union all
select 3, 101,1, date '2023-04-22' + level * interval '23' hour from dual
connect by level <= 23
union all
select 3, 100,1, date '2022-03-01' + level * interval '1 00:23:05' day to second from dual
connect by level <= 15
union all
select 4, 102,1, date '2023-01-01' + level * interval '5' hour from dual
connect by level <= 60;
BEGIN
FOR c IN
(SELECT c.owner,c.table_name,c.constraint_name
FROM user_constraints c,user_tables t
WHERE c.table_name=t.table_name
AND c.status='ENABLED'
ORDER BY c.constraint_type DESC,c.last_change DESC
)
LOOP
FOR D IN
(SELECT P.Table_Name Parent_Table,C1.Table_Name Child_Table,C1.Owner,P.Constraint_Name Parent_Constraint,
c1.constraint_name Child_Constraint
FROM user_constraints p
JOIN user_constraints c1 ON(p.constraint_name=c1.r_constraint_name)
WHERE(p.constraint_type='P'
OR p.constraint_type='U')
AND c1.constraint_type='R'
AND p.table_name=UPPER(c.table_name)
)
LOOP
dbms_output.put_line(' Disable the constraint ' || d.Child_Constraint ||' (on table '||d.owner || '.' ||
d.Child_Table || ')') ;
dbms_utility.exec_ddl_statement('alter table ' || d.owner || '.' ||d.Child_Table || ' disable constraint ' ||
d.Child_Constraint) ;
END LOOP;
END LOOP;
END;
/
Statement processed.
Disable the constraint ITEMS_FK (on table XXX.PURCHASES).
Disable the constraint CUSTOMERS_FK (on table XXX.PURCHASES).
/* no output GENERATED*/
BEGIN
FOR c IN
(SELECT c.owner,c.table_name,c.constraint_name
FROM user_constraints c,user_tables t
WHERE c.table_name=t.table_name
AND c.status='DISABLED'
ORDER BY c.constraint_type DESC,c.last_change DESC
)
LOOP
FOR D IN
(SELECT P.Table_Name Parent_Table,C1.Table_Name Child_Table,C1.Owner,P.Constraint_Name Parent_Constraint,
c1.constraint_name Child_Constraint
FROM user_constraints p
JOIN user_constraints c1 ON(p.constraint_name=c1.r_constraint_name)
WHERE(p.constraint_type='P'
OR p.constraint_type='U')
AND c1.constraint_type='R'
AND p.table_name=UPPER(c.table_name)
)
LOOP
dbms_output.put_line(' Enable the constraint ' || d.Child_Constraint ||' (on table '||d.owner || '.' ||
d.Child_Table || ')') ;
dbms_utility.exec_ddl_statement('alter table ' || d.owner || '.' ||d.Child_Table || ' enable constraint ' ||
d.Child_Constraint) ;
END LOOP;
END LOOP;
END;
/