[fpc-pascal] Re: SQLDB/Firebird unable to open table with more than 128 fields

Funky Beast funkybeast at pacific.net.sg
Sun Mar 22 16:11:49 CET 2009

Joost van der Sluis wrote:
> Op zondag 22-03-2009 om 18:40 uur [tijdzone +0800], schreef Funky Beast:
>> Joost van der Sluis wrote:
>>> Op zondag 22-03-2009 om 17:37 uur [tijdzone +0800], schreef Funky Beast:
>>>> I found the culprit.
>>>> In TIBConnection.PrepareStatement's variable section, x was declared
>>>> as a shortint
>>>> which would cause problem when its used for allocating memmory for the
>>>> SQLVAR elements,
>>>> when there are more than 128 fields.
>>>> Also same as above in TIBConnection.FreeSQLDABuffer.
>>>> I changed var x in both location into smallint and everything worked
>>>> fine for me.
>>> You are sure that a smallint is large enough in all cases? 
>> I'm not sure, but according to:
>> http://www.firebirdsql.org/index.php?op=guide&id=techspec
>> the approximation of maximum 16,384 integer fields could be allowed per table,
>> and smallint has a range of -32768..32767, double of whats stated.
>> Unless someone has more columns of smaller size data.
>> Please let me know the ideal type before I prepare the patch.
> It's up to you to decide, but as you stated smallint seems ok.
>> Should the patch be created for trunk or fixes_22 (I was using fixes_22 to test).
> In principle all patches should be made against trunk. But in this case
> I don't suspect many differences so a patch against fixes will probably
> also work. And else I can convert it.
> Joost.
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Funky Beast

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