Subject | RE: [firebird-support] Re: What is the BEST method to find if a record exists? |
---|---|
Author | Michael L. Horne |
Post date | 2004-11-16T22:52:41Z |
yes, that should work.
Ok, should have mentioned this but what if I need some
values from the record if it exists?
Thanks
Ok, should have mentioned this but what if I need some
values from the record if it exists?
Thanks
> -----Original Message-----
> From: jjochoa75 [mailto:jochoa@...]
> Sent: Tuesday, November 16, 2004 5:29 PM
> To: firebird-support@yahoogroups.com
> Subject: [firebird-support] Re: What is the BEST method to
> find if a record exists?
>
>
> Try
>
> if exists(select 1 from testfile where testfield='xxxxx') then ...
>
>
> Juan Jose
>
> --- In firebird-support@yahoogroups.com, "Michael L. Horne"
> <guardian@p...> wrote:
> > Hello,
> >
> > I need to check to see if a record exists from inside a stored
> > procedure. What is the best code to use?
> >
> > The methods I know of are:
> >
> > 1.
> > NO_RECORD_EXISTS = 'FALSE';
> > select count(*) from testfile where testfield='xxxxx'
> into :numrecords;
> > if (numrecords = 0) then NO_RECORD_EXISTS = 'TRUE';
> >
> > 2.
> > NO_RECORD_EXISTS = 'FALSE';
> > for select testfield from testfile where testfield='xxxxx'
> into :testfield
> > do begin
> > NO_RECORD_EXISTS = 'TRUE';
> > end
> >
> > 3. /* this one doesn't seem to work correctly and I am not sure
> why */
> > NO_RECORD_EXISTS = 'FALSE';
> > select first 1 testfield from testfile where testfield='xxxxx' into
> > :testfield; if (testfield = null) then NO_RECORD_EXISTS = 'TRUE';
> >
> > -------
> > But these all seem like a difficult set of things to do to find
> out if a
> > record exists, so is there a better way and what is it?
> >
> > Thanks
> > Michael L. Horne
>
>
>
>
>
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