Regd:- trigger.

Question

hi friends,
please help me on trigger..
i want Update the data on same table where insert in same table.
example.
i am inserting records on employee table same time i want to update same data on same same table.but its giving me Mutating error..
what is solution on this,pls help.
--rajnish                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

Read the below link :
http://www.oraclepassport.com/Triggers.html
In the Row level trigger we cannot update, insert or select from the mutating table. So we create a package with a collection type in it. Then in the Row level trigger store the values (to be used) into the Collection type. Then add a Statement level trigger to the same table which calls the Package uses the stored data to do the data manipulation.
create package pack1
is
arr VARRAY(100);
end;
create or replace trigger row_trg1
before update on table1
for each row
begin
pack1.arr(0):= :old.col1;
end;
create or replace trigger stmt_trg1
before update on table1
declare
v_col number;
begin
v_col:= pack1.arr(0);
<processing>
end;
thanks,
Vinodh
Edited by: Vinodh2 on Jun 18, 2010 3:49 AM