plz explain when we are using pre-query,post-query,pre-insert and post-insert?p

plz explain when we are using
pre-query,post-query,pre-insert and post-insert?plz explain
with one example

Question Posted / eswarsure

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plz explain when we are using pre-query,post-query,pre-insert and post-insert?plz explain with one..

Pre-Query is Used For Doing Proper Validation Before Any Query Related Operation .
Example:=

DECLARE
V_Where VARCHAR2(50);
V_OrderBy VARCHAR(100);
BEGIN
V_Where := 'Deptno = '||:CONTROLBLOCK.QUERYDEPT;
V_OrderBy := :CONTROLBLOCK.DATASORTGROUP||' '||:CONTROLBLOCK.SORTORDERGROUP;
SET_BLOCK_PROPERTY ('EMPBLOCK', DEFAULT_WHERE, V_Where);
SET_BLOCK_PROPERTY ('EMPBLOCK', ORDER_BY, V_OrderBy);
END;

Post-Query is Used For Doing The Tax After validation is complete

Example:=
INSERT INTO SCOTT.QueryAudit@ORCL
VALUES(1, USER, USERENV('TERMINAL'), TO_DATE(TO_CHAR(SYSDATE, 'DD-MON-YYYY'), 'DD-MON-YYYY'), TO_DATE(TO_CHAR(SYSDATE, 'HH:MI:SS'), 'HH:MI:SS'));

Pre-Insert is doing the tax before insert into the database

Example:=
MESSAGE('Pre Insert Trigger Fired...');
MESSAGE(' ');
SELECT EmpIncr.NEXTVAL
INTO :EMPBLOCK.Empno
FROM SYS.DUAL;
:GLOBAL.GENEmpno := :EMPBLOCK.Empno;
Post-Insert is Fired After The Data Insert Into The database
The Pre-insert And Post-Insert Helps For No Null Value Taken Even We Take Any Sequence In my Coading Because If There is no Proper validation Then The Raise Form_Trigger_Failure Trigger Terminate The Application

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plz explain when we are using pre-query,post-query,pre-insert and post-insert?plz explain with one..

Answer / sudipta santra

PRE-QUERY: BEFORE PARSING OF QUERY THIS TRIGGER IS FIRED.

POST-QUERY: AFTER PARSING OF THE QUERY AND BEFORE POST TO
THE DB, IT IS FIRED.

NOTE: THE VALUE CAN BE CHANGED AFTER FIRING PRE-QUERY BUT
THE VALUE CAN NOT BE CHANGED AFTER FIRING POST-QUERY.

PRE-INSERT: BEFORE INSERT IN THE DATA-BLOCK, IT IS FIRED.

POST-INSERT: AFTER INSERT INTO THE DATA BLOCK AND BEFORE
POST INTO THE DB IT IS FIRED.

NOTE: THE VALUE CAN BE CHANGED IN PRE-INSERT BUT NOT
POSSIBLE IN POST-INSERT.