--實例1------------------------

--創建觸發器，當用戶對test表執行DML語句時，將相關信息記錄到日志表

--創建測試表

CREATE TABLE test

(

t_id?? NUMBER(4),

t_name VARCHAR2(20),

t_age? NUMBER(2),

t_sex? CHAR

);

--創建記錄測試表

CREATE TABLE test_log

(

l_user?? VARCHAR2(15),

l_type?? VARCHAR2(15),

l_date?? VARCHAR2(30)

);

--創建觸發器

CREATE OR REPLACE TRIGGER test_trigger

AFTER DELETE OR INSERT OR UPDATE ON test

DECLARE

v_type test_log.l_type%TYPE;

BEGIN

IF INSERTING THEN? --INSERT觸發

v_type := 'INSERT';

DBMS_OUTPUT.PUT_LINE('記錄已經成功插入，并已記錄到日志');

ELSIF UPDATING THEN? --UPDATE觸發

v_type := 'UPDATE';

DBMS_OUTPUT.PUT_LINE('記錄已經成功更新，并已記錄到日志');

ELSIF DELETING THEN

v_type := 'DELETE';

DBMS_OUTPUT.PUT_LINE('記錄已經成功刪除，并已記錄到日志');

END IF;

INSERT INTO test_log VALUES(user,v_type,

TO_CHAR(sysdate,'yyyy-mm-dd hh24:mi:ss'));

END;

/

--下面我們來分別執行DML語句

INSERT INTO test VALUES(101,'zhao',22,'M');

UPDATE test SET t_age = 30 WHERE t_id = 101;

DELETE test WHERE t_id = 101;

--然后查看效果

SELECT * FROM test;

SELECT * FROM test_log;

--實例2------------------------

--創建觸發器，它將映射emp表中每個部門的總人數和總工資

--創建映射表

CREATE TABLE dept_sal

AS

SELECT deptno,COUNT(empno) AS total_emp,SUM(sal) AS total_sal FROM emp GROUP BY deptno;

DESC dept_sal;

--創建觸發器

CREATE OR REPLACE TRIGGER emp_info

AFTER INSERT OR UPDATE OR DELETE ON emp

DECLARE

CURSOR cur_emp IS

SELECT deptno,COUNT(empno) AS total_emp,SUM(sal) AS total_sal FROM emp GROUP BY deptno;

BEGIN

DELETE dept_sal;? --觸發時首先刪除映射表信息

FOR v_emp IN cur_emp LOOP

--DBMS_OUTPUT.PUT_LINE(v_emp.deptno || v_emp.total_emp || v_emp.total_sal);

--插入數據

INSERT INTO dept_sal

VALUES(v_emp.deptno,v_emp.total_emp,v_emp.total_sal);

END LOOP;

END;

/

--對emp表進行DML操作

INSERT INTO emp(empno,deptno,sal) VALUES('123','10',10000);

SELECT * FROM dept_sal;

DELETE EMP WHERE empno=123;

SELECT * FROM dept_sal;

--實例3------------------------

--創建觸發器，它記錄表的刪除數據

--創建表

CREATE TABLE employee

(

id?? VARCHAR2(4)? NOT NULL,

name VARCHAR2(15) NOT NULL,

age? NUMBER(2)??? NOT NULL,

sex? CHAR???????? NOT NULL

);

DESC employee;

--插入數據

INSERT INTO employee VALUES('e101','zhao',23,'M');

INSERT INTO employee VALUES('e102','jian',21,'F');

--創建記錄表

CREATE TABLE old_employee AS

SELECT * FROM employee;

DESC old_employee;

--創建觸發器

CREATE OR REPLACE TRIGGER tig_old_emp

AFTER DELETE ON employee? --

FOR EACH ROW? --語句級觸發，即每一行觸發一次

BEGIN

INSERT INTO old_employee

VALUES(:old.id,:old.name,:old.age,:old.sex);? --:old代表舊值

END;

/

--下面進行測試

DELETE employee;

SELECT * FROM old_employee;

--實例4------------------------

--創建觸發器，利用視圖插入數據

--創建表

CREATE TABLE tab1 (tid NUMBER(4) PRIMARY KEY,tname VARCHAR2(20),tage NUMBER(2));

CREATE TABLE tab2 (tid NUMBER(4),ttel VARCHAR2(15),tadr VARCHAR2(30));

--插入數據

INSERT INTO tab1 VALUES(101,'zhao',22);

INSERT INTO tab1 VALUES(102,'yang',20);

INSERT INTO tab2 VALUES(101,'13761512841','AnHuiSuZhou');

INSERT INTO tab2 VALUES(102,'13563258514','AnHuiSuZhou');

--創建視圖連接兩張表

CREATE VIEW tab_view AS

SELECT tab1.tid,tname,ttel,tadr FROM tab1,tab2

WHERE tab1.tid = tab2.tid;

--創建觸發器

CREATE OR REPLACE TRIGGER tab_trigger

INSTEAD OF INSERT ON tab_view

BEGIN

INSERT INTO tab1(tid,tname) VALUES(:new.tid,:new.tname);

INSERT INTO tab2(ttel,tadr) VALUES(:new.ttel,:new.tadr);

END;

/

--現在就可以利用視圖插入數據

INSERT INTO tab_view VALUES(105,'zhaoyang','13886681288','beijing');

--查看效果

SELECT * FROM tab_view;

--實例5------------------------

--創建觸發器，比較emp表中更新的工資

CREATE OR REPLACE TRIGGER sal_emp

BEFORE UPDATE ON emp

FOR EACH ROW

BEGIN

IF :OLD.sal > :NEW.sal THEN

DBMS_OUTPUT.PUT_LINE('工資減少');

ELSIF :OLD.sal < :NEW.sal THEN

DBMS_OUTPUT.PUT_LINE('工資增加');

ELSE

DBMS_OUTPUT.PUT_LINE('工資未作任何變動');

END IF;

DBMS_OUTPUT.PUT_LINE('更新前工資 ：' || :OLD.sal);

DBMS_OUTPUT.PUT_LINE('更新后工資 ：' || :NEW.sal);

END;

/

--執行UPDATE查看效果

UPDATE emp SET sal = 3000 WHERE empno = '7788';

--實例6------------------------

--創建觸發器，將操作CREATE、DROP存儲在log_info表

--創建表

CREATE TABLE log_info

(

manager_user VARCHAR2(15),

manager_date VARCHAR2(15),

manager_type VARCHAR2(15),

obj_name???? VARCHAR2(15),

obj_type???? VARCHAR2(15)

);

--創建觸發器

CREATE OR REPLACE TRIGGER trig_log_info

AFTER CREATE OR DROP ON SCHEMA

BEGIN

INSERT INTO log_info

VALUES(USER,SYSDATE,SYS.DICTIONARY_OBJ_NAME,SYS.DICTIONARY_OBJ_OWNER,

SYS.DICTIONARY_OBJ_TYPE);

END;

/

--測試語句

CREATE TABLE a(id NUMBER);

CREATE TYPE aa AS OBJECT(id NUMBER);

/

DROP TABLE a;

DROP TYPE aa;

--查看效果

SELECT * FROM log_info;

--相關數據字典-----------------------------------------------------//

SELECT * FROM USER_TRIGGERS;

SELECT * FROM ALL_TRIGGERS;

SELECT * FROM DBA_TRIGGERS;? --必須以DBA身份登陸才能使用此數據字典

--啟用和禁用

ALTER TRIGGER trigger_name DISABLE;

ALTER TRIGGER trigger_name ENABLE;

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