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Message-ID: <a97c77030612110901j3e826675o56e23dfd175ddce4@mail.gmail.com>
Date: Mon, 11 Dec 2006 22:31:08 +0530
From: "Rajesh Kumar Mallah" <mallah.rajesh@gmail.com>
To: "Jens Schipkowski" <jens.schipkowski@apus.co.at>
Subject: Re: really quick multiple inserts can use COPY?
Cc: pgsql-performance@postgresql.org
In-Reply-To: <op.tkekypo381rjf6@xjens.apus.local>
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References: <op.tkekypo381rjf6@xjens.apus.local>

> So, my questions:
> Is it possible to use COPY FROM STDIN with JDBC?

Should be. Its at least possible using DBI and DBD::Pg (perl)


 my $copy_sth = $dbh -> prepare( "COPY
general.datamining_mailing_lists (query_id,email_key) FROM STDIN;") ;
  $copy_sth -> execute();
  while (my ($email_key ) = $fetch_sth -> fetchrow_array ()) {
          $dbh -> func("$query_id\t$email_key\n", 'putline');
  }
  $fetch_sth -> finish();
  $dbh -> func("\\.\n", 'putline');
  $dbh -> func('endcopy');
  $copy_sth->finish();

Some JDBC expert would tell better how its done with JDBC.


> Will it bring performance improvement compared to SELECT UNION solution?

COPY is quite faast.

Regds
mallah.

>
> many thanks in advance,
> Jens Schipkowski
>
> --
> **
> APUS Software GmbH
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