Subject RE: [firebird-support] Re: What is the BEST method to find if a record exists?
Author Ricardo Ag├╝ero Rodas
Just a little correction .... if you let me ....

if (exists(select 1 from testfile where testfield='xxxxx')) then

Ricardo.


-----Mensaje original-----
De: jjochoa75 [mailto:jochoa@...]
Enviado el: martes, 16 de noviembre de 2004 23:29
Para: firebird-support@yahoogroups.com
Asunto: [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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