Trigger and Functions

Question

Hi All,
I am new to PL/SQL. In my projeect i came thru a requirement.
My table has a column called time and the type of column is char(4).
data will look like 1100. The new table has time as char(5), Now i want to write a trigger for each row inserted to change time col data to 11:00
for that i wrote a trigger and function. The function compiled well, i get errors compiling trigger.
Here is the code for trigger and the function. Any help is appriciated. any code that will meet my requirements is helpfull.
create or replace TRIGGER "PACER"."TimeTrigger"
AFTER INSERT
ON PACER.TIMETEST2
BEGIN
UPDATE TimeTrigger
     SET TIME1 = ChangeTime(TIME1);
     SET TIME2 = ChangeTime(TIME2);
END;
Error(9,2): PL/SQL: SQL Statement ignored
Error(9,6): PL/SQL: ORA-00922: missing or invalid option
create or replace FUNCTION ChangeTime(ChTime VarChar2) RETURN Varchar2 IS
     Len NUMBER;
     ChHours CHAR(2);
     ChMinutes CHAR(2);
     ChSec CHAR(2);
     ChColun CHAR(1);
     ChTimeFormat CHAR(5);
BEGIN
     Len := LENGTH(ChTime);
     ChColun := ':';
     IF Len = 4 THEN
          ChHours := SUBSTR(ChTime,1,2);
          ChMinutes := SUBSTR(ChTime,3,4);
          ChTimeFormat := ChHours||ChColun||ChMinutes;
     END IF;
     RETURN ChTimeFormat;
END ChangeTime;
Thanks.

Answer 1

Hi,
Here's something you can try. It should give you ideas.
CREATE TABLE     table_x
(     empno          NUMBER
,     ename          VARCHAR2 (10)
,     status_cd     VARCHAR2 (1)
CREATE TABLE     table_y
(     id          NUMBER
,     name          VARCHAR2 (15)
,     status_cd     VARCHAR2 (1)
CREATE OR REPLACE TRIGGER     table_x_aiu
AFTER INSERT OR UPDATE ON     table_x
FOR EACH ROW
BEGIN
--     This trigger keeps a copy of table_x's
--     empno, ename and status_cd columns in table_y's
--     id,    name  and status_cd columns.
--     The strings in table_x be any combination of UPPER
--     and lower case, but the copies in table_y are always
--     UPPER.
     MERGE INTO     table_y     y
     USING     (
          SELECT     :NEW.empno          AS empno
          ,     UPPER (:NEW.ename)     AS ename
          ,     UPPER (:NEW.status_cd)     AS status_cd
          FROM     dual
          )          x
     ON     (x.empno = y.id)
     WHEN MATCHED          THEN
     UPDATE     SET     y.name          = x.ename
          ,     y.status_cd     = x.status_cd
     WHEN NOT MATCHED     THEN
     INSERT     (y.id,          y.name,          y.status_cd)
     VALUES     (x.empno,     x.ename,     x.status_cd);
END     table_x_aiu;
SHOW ERRORS
PROMPT  ***** Testing INSERT  *****
INSERT INTO table_x (empno, ename, status_cd) VALUES (1, 'Agatha',     'A');
INSERT INTO table_x (empno, ename, status_cd) VALUES (2, 'Lucy',     'b');
PROMPT     ***** table_y should have two rows  *****
SELECT     *
FROM     table_y
ORDER BY     id;
PROMPT  ***** Testing UPDATE  *****
UPDATE     table_x
SET     ename     = 'Agnes'
WHERE     empno     = 1;
PROMPT     ***** ID=1 should have name='AGNES' and status_cd='A'  *****
SELECT     *
FROM     table_y
ORDER BY     id;The names I give to triggers are usually similar to, but not exactly the same as, the name of the table to which they are attached. The last part of the trigger name, "_aiu", is a reminder that this trigger fires After Insert or Update.
Avoid using double-quotes when naming things.