CREATE TABLE employees (
last_name VARCHAR2(100),
salary NUMBER,
department_id INTEGER)
BEGIN
INSERT INTO employees VALUES ('Polly', 1000, 10);
INSERT INTO employees VALUES ('Molly', 5673, 60);
INSERT INTO employees VALUES ('Golly', 23409, 60);
COMMIT;
END;
CREATE OR REPLACE PROCEDURE show_trigger_event
IS
BEGIN
DBMS_OUTPUT.put_line (CASE
WHEN UPDATING ('last_name') THEN 'UPDATE last_name'
WHEN UPDATING THEN 'UPDATE'
WHEN INSERTING THEN 'INSERT'
WHEN DELETING THEN 'DELETE'
ELSE 'Procedure not executed from DML trigger!'
END);
END;
更新或插入后触发器
CREATE OR REPLACE TRIGGER employee_changes_after
AFTER UPDATE OR INSERT
ON employees
BEGIN
show_trigger_event;
END;
CREATE OR REPLACE TRIGGER employee_changes_before
BEFORE DELETE
ON employees
BEGIN
show_trigger_event;
END;
测试一下
BEGIN
show_trigger_event;
UPDATE employees
SET last_name = UPPER (last_name);
UPDATE employees
SET salary = salary * 10
WHERE department_id = 10;
DELETE FROM employees WHERE department_id = 60;
INSERT INTO employees (last_name, salary, department_id)
VALUES ('Feuerstein', 1000000, 10);
END;
