Use user-defined function in trigger : After Insert Trigger « Trigger « Oracle PL / SQL






Use user-defined function in trigger

    
SQL>
SQL>
SQL>
SQL> CREATE TABLE EMP(
  2      EMPNO NUMBER(4) NOT NULL,
  3      ENAME VARCHAR2(10),
  4      JOB VARCHAR2(9),
  5      MGR NUMBER(4),
  6      HIREDATE DATE,
  7      SAL NUMBER(7, 2),
  8      COMM NUMBER(7, 2),
  9      DEPTNO NUMBER(2)
 10  );

Table created.

SQL>
SQL> INSERT INTO EMP VALUES(7369, 'SMITH', 'CLERK', 7902,TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7499, 'ALLEN', 'SALESMAN', 7698,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7521, 'WARD', 'SALESMAN', 7698,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7566, 'JONES', 'MANAGER', 7839,TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES(7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES(7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

1 row created.


SQL>
SQL> create or replace procedure sal_check( p_deptno in number)is
  2          pragma autonomous_transaction;
  3          avg_sal number;
  4          max_sal number;
  5  begin
  6          select avg(sal), max(sal)
  7            into avg_sal, max_sal
  8            from emp
  9          where deptno = p_deptno;
 10          if ( max_sal/2 > avg_sal )
 11          then
 12              raise_application_error(-20001,'Rule violated');
 13          end if;
 14  end;
 15  /
 
SQL>
SQL>
SQL> create or replace trigger sal_trigger
  2  after insert or update or delete on emp
  3  for each row
  4  begin
  5          if (inserting or updating) then
  6              sal_check(:new.deptno);
  7          end if;
  8          if (updating or deleting) then
  9              sal_check(:old.deptno);
 10          end if;
 11  end;
 12  /

Trigger created.

SQL>
SQL> update emp set sal = sal*1.1;
update emp set sal = sal*1.1
       *
ERROR at line 1:
ORA-04091: table JAVA2S.EMP is mutating, trigger/function may not see it
ORA-06512: at "JAVA2S.SAL_CHECK", line 5
ORA-06512: at "JAVA2S.SAL_TRIGGER", line 3
ORA-04088: error during execution of trigger 'JAVA2S.SAL_TRIGGER'


SQL>
SQL> drop table emp;

Table dropped.

   
    
    
    
  








Related examples in the same category

1.Create an 'AFTER INSERT' Trigger
2.Create an After Row Trigger
3.Create an After Statement Trigger