| triggers [message #38411] |
Wed, 17 April 2002 02:14  |
krishna
Messages: 141
Registered: October 1998
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Senior Member |
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Hi!
I need your help, i want to create a trigger on a table before update, such that it should know which field(s) are updated. Once i got the field(s), i can feed other table having fields:
table_name,field_name,timestap.
I don't want to create a trigger on each field .
Best Regards
Krishna
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| Re: triggers [message #38414 is a reply to message #38411] |
Wed, 17 April 2002 04:00  |
Epe
Messages: 99
Registered: March 2002
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Member |
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Hello,
if I understand your problem correctly, you want to keep track of the updates of one particular table by populating the table with structure (table_name, field_name, timestamp), using a before update trigger.
==>
Suppose the table you want to update table_A(field1,field2), and put the tracking data in table_log with the structure mentioned above.
==>
create or replace trigger
before update on table_A
for each row
begin
if :new.field1 <> :old.field1
then
insert into table_log(table_name,field_name,timestamp)
values('table_A','field1',sysdate);
end if;
if :new.field2 <> :old.field2
then
insert into table_log(table_name,field_name,timestamp)
values('table_A','field2',sysdate);
end if;
end;
I hope this helps you, succes,
epe
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