trigger

trigger_ddl.sql

@@ -0,0 +1,22 @@
+USE Study
+GO
+
+-- 트리거 생성
+
+CREATE TRIGGER ROLLBACK_TRIGGER
+ON DATABASE
+FOR DROP_TABLE
+AS
+	BEGIN
+
+	PRINT('DDL trigger: rollback')
+
+	ROLLBACK TRANSACTION
+
+	END
+
+
+-- 테스트
+DROP TABLE EMPLOYEE
+
+SELECT * FROM EMPLOYEE

trigger_dml.sql

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+USE Study
+GO
+
+-- AFTER(FOR) 트리거 생성
+
+CREATE TRIGGER NEW_EMP_SAL
+ON EMPLOYEE
+FOR INSERT
+AS
+	BEGIN
+
+	PRINT('NEW_EMP_SAL Trigger is invoked.')
+
+	SELECT * FROM inserted
+
+	UPDATE EMPLOYEE SET SALARY = 100
+	FROM inserted, EMPLOYEE
+	WHERE inserted.ENO = EMPLOYEE.ENO
+
+	PRINT('Salary of new comer becomes 100')
+
+	SELECT * FROM inserted, EMPLOYEE WHERE inserted.ENO = EMPLOYEE.ENO
+
+	END
+
+
+-- 테스트
+INSERT INTO EMPLOYEE(ENO, ENAME) VALUES(300, 'newcommer')
+
+
+
+
+-- INSTEAD OF 트리거 생성
+
+CREATE TRIGGER NO_UPDATE
+ON DEPARTMENT
+INSTEAD OF UPDATE
+AS
+	BEGIN
+
+	PRINT('Update for the DEPARTMENT is prevented')
+
+	END
+
+-- 테스트
+SELECT * FROM DEPARTMENT
+UPDATE DEPARTMENT SET LOC='SEOUL'
+SELECT * FROM DEPARTMENT