怎样基于多表视图进行更新操作

[windylu]

如上

[ljian_mail]

三千兄，佩服。有没有学 oracle的秘诀呀

[jaderiver]

可以用instead of触发器。

[KingSunSha]

oracle的sql reference文档中的例子，非常经典地回答了instead of触发器的用法和实际用途（就是本贴所要求的）。
INSTEAD OF Trigger Example: In this example, customer data is stored in two tables. The object view ALL_CUSTOMERS is created as a UNION of the two tables, CUSTOMERS_SJ and CUSTOMERS_PA. An INSTEAD OF trigger is used to insert values.

CREATE TABLE customers_sj
( cust NUMBER(6),
address VARCHAR2(50),
credit NUMBER(9,2) );

CREATE TABLE customers_pa
( cust NUMBER(6),
address VARCHAR2(50),
credit NUMBER(9,2) );

CREATE TYPE customer_t AS OBJECT
( cust NUMBER(6),
address VARCHAR2(50),
credit NUMBER(9,2),
location VARCHAR2(20) );

CREATE VIEW all_customers (cust) AS
SELECT customer_t (cust, address, credit, ’SAN_JOSE’)
FROM customers_sj
UNION ALL
SELECT customer_t (cust, address, credit, ’PALO_ALTO’)
FROM customers_pa;

CREATE TRIGGER instrig INSTEAD OF INSERT ON all_customers
FOR EACH ROW
BEGIN
IF (:new.cust.location = ’SAN_JOSE’) THEN
INSERT INTO customers_sj
VALUES (:new.cust.cust, :new.cust.address,:new.cust.credit);
ELSE
INSERT INTO customers_pa
VALUES (:new.cust.cust, :new.cust.address, :new.cust.credit);
END IF;
END;

[teng]

gz