DML触发器--记录某张表的dml操作

CREATE TABLE logs(

LOG_ID NUMBER(10) PRIMARY KEY,

LOG_TABLE VARCHAR2(10) NOT NULL,

LOG_DML VARCHAR2(10),

LOG_KEY_ID NUMBER(10),

LOG_DATE DATE,

LOG_USER VARCHAR2(15),

LOG_TERMINAL varchar2(100),

LOG_IP_ADDRESS varchar2(20)

);

CREATE SEQUENCE logs_id_squ INCREMENT BY 1

START WITH 1 MAXVALUE 9999999 NOCYCLE NOCACHE;

CREATE OR REPLACE TRIGGER DML_LOG

BEFORE --触发时间为操作前

DELETE OR INSERT OR UPDATE -- 由三种事件触发

ON emp

FOR EACH ROW -- 行级触发器

BEGIN

IF INSERTING THEN

INSERT INTO logs VALUES(logs_id_squ.NEXTVAL,'EMP','INSERT',:new.empno,SYSDATE,USER,SYS_CONTEXT('USERENV','TERMINAL'),SYS_CONTEXT('USERENV','IP_ADDRESS'));

ELSIF DELETING THEN

INSERT INTO logs VALUES(logs_id_squ.NEXTVAL,'EMP','DELETE',:old.empno,SYSDATE,USER,SYS_CONTEXT('USERENV','TERMINAL'),SYS_CONTEXT('USERENV','IP_ADDRESS'));

ELSE

INSERT INTO logs VALUES(logs_id_squ.NEXTVAL,'EMP','UPDATE',:new.empno,SYSDATE,USER,SYS_CONTEXT('USERENV','TERMINAL'),SYS_CONTEXT('USERENV','IP_ADDRESS'));

END IF;

END;

/

/** 测试部分

insert into emp values(1234,'shawn','clerk',7902,sysdate,3000);

commit;

select * from emp;

select * from logs;

update emp set sal=5000 where empno=1234;

commit;

select * from emp;

select * from logs;

delete * from emp where empno=1234;

commit;

select * from emp;

select * from logs;

**/