Re: trigger program: can I fool a program into reading some select fi elds from another file?

Join won't work.

Any programs that update the old file will croak.  Join's are not 
updatable.

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 




Scott Klement <klemscot@xxxxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
10/13/2003 03:59 PM
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Re: trigger program: can I fool a program into reading some select fi elds 
from another file?








Unless I'm mistaken, you can do this with a join logical file...

Rename the old customer file, build a join logical over it and the new
customer file so that it pulls the address from one, and the remainder of
the data from the other...


On Mon, 13 Oct 2003, Stone, Joel wrote:

> I have 1000+ programs reading a customer master file (the old cust 
file).
> Can I add a trigger program which performs the following:
>
> Whenever a program which reads a record from the old customer master 
file:
>
> Read a different new customer file, get the customer's address from the 
new
> file, and place the new address field into the address field in the old
> customer record format.
>
> Using this method, I could add a new file and not have to change any of 
the
> many programs using the old customer master file.
>
> If not a trigger program, is there any other method to accomplish this 
on
> the Iseries?
>
> I am aware of OVRDBF, but that will not allow me to grab select fields 
from
> another file.
>
> Also I am familiar with OPNQRYF, but that would require CL changes and 
would
> limit the ease of implementation.  Also, OPNQRYF would not support any 
logic
> built into the record retrieval.
>
> If I could use a trigger program, in theory, I could make a database 
change
> which would require no changes to programs using the customer file.
>
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