Oracle中 delete、insert、update时触发器trigger的用法

insert:

create or replace trigger TRI_ADD_EMP

  after insert on emp for each row

declare

  pragma autonomous_transaction;

begin

  insert into emp_copy
  select :new.empno, :new.ename, :new.job, :new.mgr, :new.hiredate, :new.sal, :new.comm, :new.deptno, sysdate, 'insert', '' from dual;
  commit;

end TRI_ADD_EMP;

update:

create or replace trigger TRI_MOD_EMP

  after update on emp for each row

declare

  pragma autonomous_transaction;

begin

  insert into emp_copy
    select t.*, sysdate, 'update', 'SAL : 改变前 ' || :old.SAL || ' ==> 改变后' || :new.SAL
     from emp t where t.EMPNO = :old.EMPNO;
  commit;

end TRI_MOD_EMP;

delete:

create or replace trigger TRI_DEL_EMP

  after delete on emp for each row

declare

  pragma autonomous_transaction;

begin

  insert into emp_copy
    select t.*, sysdate, 'delete', '' from emp t where t.EMPNO = :old.EMPNO;
  commit;

end TRI_DEL_EMP;

基表数据：

CREATE TABLE "SCOTT"."EMP" 
   (	"EMPNO" NUMBER(4,0), 
	"ENAME" VARCHAR2(10), 
	"JOB" VARCHAR2(9), 
	"MGR" NUMBER(4,0), 
	"HIREDATE" DATE, 
	"SAL" NUMBER(7,2), 
	"COMM" NUMBER(7,2), 
	"DEPTNO" NUMBER(2,0), 
	 CONSTRAINT "PK_EMP" PRIMARY KEY ("EMPNO")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS"  ENABLE, 
	 CONSTRAINT "FK_DEPTNO" FOREIGN KEY ("DEPTNO")
	  REFERENCES "SCOTT"."DEPT" ("DEPTNO") ENABLE
   ) SEGMENT CREATION IMMEDIATE 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS" ;
 
  CREATE UNIQUE INDEX "SCOTT"."PK_EMP" ON "SCOTT"."EMP" ("EMPNO") 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS" ;
 
  ALTER TABLE "SCOTT"."EMP" ADD CONSTRAINT "PK_EMP" PRIMARY KEY ("EMPNO")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS"  ENABLE;

CREATE TABLE "SCOTT"."EMP_COPY" 
   (	"EMPNO" NUMBER(4,0), 
	"ENAME" VARCHAR2(10), 
	"JOB" VARCHAR2(9), 
	"MGR" NUMBER(4,0), 
	"HIREDATE" DATE, 
	"SAL" NUMBER(7,2), 
	"COMM" NUMBER(7,2), 
	"DEPTNO" NUMBER(2,0), 
	"ADD_TIME" DATE, 
	"ACTION" VARCHAR2(50), 
	"CHANGE" VARCHAR2(1000)
   ) SEGMENT CREATION IMMEDIATE 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 8192 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS" ;

prompt Importing table EMP...
set feedback off
set define off
insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (8000, 'JACK', 'SALESMAN', 7698, to_date('19-11-2020 15:25:53', 'dd-mm-yyyy hh24:mi:ss'), 2000.00, 500.00, 30, 'AAAR3sAAEAAAACWAAA');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7521, 'WARD', 'SALESMAN', 7698, to_date('22-02-1981', 'dd-mm-yyyy'), 1252.00, 500.00, 30, 'AAAR3sAAEAAAACXAAC');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7566, 'JONES', 'MANAGER', 7839, to_date('02-04-1981', 'dd-mm-yyyy'), 2975.00, null, 20, 'AAAR3sAAEAAAACXAAD');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7654, 'MARTIN', 'SALESMAN', 7698, to_date('28-09-1981', 'dd-mm-yyyy'), 1250.00, 1400.00, 30, 'AAAR3sAAEAAAACXAAE');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7698, 'BLAKE', 'MANAGER', 7839, to_date('01-05-1981', 'dd-mm-yyyy'), 2850.00, null, 30, 'AAAR3sAAEAAAACXAAF');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7782, 'CLARK', 'MANAGER', 7839, to_date('09-06-1981', 'dd-mm-yyyy'), 2450.00, null, 10, 'AAAR3sAAEAAAACXAAG');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7788, 'SCOTT', 'ANALYST', 7566, to_date('19-04-1987', 'dd-mm-yyyy'), 3000.00, null, 20, 'AAAR3sAAEAAAACXAAH');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981', 'dd-mm-yyyy'), 5000.00, null, 10, 'AAAR3sAAEAAAACXAAI');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7844, 'TURNER', 'SALESMAN', 7698, to_date('08-09-1981', 'dd-mm-yyyy'), 1500.00, 0.00, 30, 'AAAR3sAAEAAAACXAAJ');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7876, 'ADAMS', 'CLERK', 7788, to_date('23-05-1987', 'dd-mm-yyyy'), 1100.00, null, 20, 'AAAR3sAAEAAAACXAAK');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7900, 'JAMES', 'CLERK', 7698, to_date('03-12-1981', 'dd-mm-yyyy'), 950.00, null, 30, 'AAAR3sAAEAAAACXAAL');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7902, 'FORD', 'ANALYST', 7566, to_date('03-12-1981', 'dd-mm-yyyy'), 3000.00, null, 20, 'AAAR3sAAEAAAACXAAM');

insert into EMP (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO, ROWID)
values (7934, 'MILLER', 'CLERK', 7782, to_date('23-01-1982', 'dd-mm-yyyy'), 1300.00, null, 10, 'AAAR3sAAEAAAACXAAN');

prompt Done.