Re: [PATCH] Provide rowcount for utility SELECTs

Tom Lane írta:
> Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
>
>> On mĂĽn, 2009-12-28 at 11:08 -0500, Tom Lane wrote:
>>
>>> And, by the same token, the scope for possibly breaking clients is nearly
>>> unlimited ...
>>>
>
>
>> Why is that? Are there programs out there that expect PQcmdTuples() to
>> return something that is *not* the tuple count for these commands and
>> will violently misbehave otherwise?
>>
>
> It's more the possibility of doing strcmp(tag, "SELECT") on the command
>

Actually it's strncmp(tag, "SELECT ", 7), so when you mix old server
with new clients or new server with old client, it will just work as
before, i.e.
return "".

> tag that worries me. Describing the API change here as being limited
> to PQcmdTuples misses the point rather completely: this is a protocol
> change, and could break both clients and non-libpq driver libraries.
>
> regards, tom lane
>
>

--
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Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
http://www.postgresql.at/