Re: Out of memory error on huge resultset

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От Barry Lind
Тема Re: Out of memory error on huge resultset
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Msg-id 3DA7978D.5090008@xythos.com
обсуждение исходный текст
Ответ на Re: Out of memory error on huge resultset  ("Simpson, Mike W" <mike.simpson@pbs.proquest.com>)
Ответы Re: Out of memory error on huge resultset  (Nic Ferrier <nferrier@tapsellferrier.co.uk>)
Список pgsql-jdbc

Nic Ferrier wrote:

> So I'm simply transforming querys from:
>
>
>     SELECT x FROM y WHERE z;
>
>
> into
>
>     DECLARE jdbcXX CURSOR FOR $query ;
>     FETCH FORWARD $fetchSize jdbcXX;
>

And when $query is:  "insert into foo values (...); select * from bar;"

You will get:
DECLARE jdbcXX CURSOR FOR insert into foo values (...);
select * from bar;
FETCH FORWARD $fetchSize jdbcXX;

Which clearly isn't what you want.

So like the discussion that we had on when we should/could use server
side prepared statements either the default needs to be not to use
cursors, or the sql string needs to be parsed looking for ';' and only
use cursors if no ';' is found.

thanks,
--Barry



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