Re: using CURSOR with PHP

* Marco Colombo <marco(at)esi(dot)it> [28 05 02 18:26]:

>On Tue, 28 May 2002, Eckhard Hoeffner wrote:
>
>> * Marco Colombo <marco(at)esi(dot)it> [28 05 02 17:32]:
>
>> >AFAIK, a CURSOR may be used only inside a single transaction, not a
>> >single session. So it can't be used to 'page' the output of a query,
>> >for example.
>> >
>> >And, also AFAIK, even with pconnect, each connect creates a different
>> >session. Only the (TCP) connection is re-used. I mean, nothing changes
>> >from the PHP script standpoint when you switch from pg_connect() to
>> >pg_pconnect().
>>
>> I think, you are right. The connection browser<->web server is cut
>> after the web server has send all TCP/IP-packages, no matter how
>> long it takes till they are received on the client side (browser).
>> If there ist a request for a new database connection, the web server
>> does not know whether this is the former user or a new user. For
>> this reason the result I wanted to acchive is not possible.
>
>Well, with HTTP keepalive, it may even keep the HTTP session open.
>But the problem is that you can't relay on it.
>Moreover, I suspect that PHP resets the SQL session when it performs
>an pconnect (that means, it asks the SQL backend to abort uncommitted
>transactions, drop TEMP relations, and so on).
>
>And, no matter what is the actual behaviour, the docs are clear:
>
> "An important summary. Persistent connections were designed to have
> one-to-one mapping to regular connections. That means that you should
> always be able to replace persistent connections with non-persistent
> connections, and it won't change the way your script behaves. It may
> (and probably will) change the efficiency of the script, but not its
> behavior!"
>
>so even if it worked, it's an undocumented feature... well, it's a bug,
I did not claim, that it worked and after having read the thread I
also think, it will not work, however, I will try this at home. If
it works, I will send the results.

--
--//--\\--
Eckhard Hoeffner
e-hoeffner(at)fifoost(dot)org
Tal 44
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