From: Sebastian Hennebrueder <usenet@laliluna.de>
To: pgsql-performance@postgresql.org
Subject: Re: effizient query with jdbc
Date: Fri, 06 Jan 2006 15:03:42 +0100
Message-ID: <43BE78BE.3070508@laliluna.de> (raw)
In-Reply-To: <20051215080714.03919654@malmo.geotask.ch>
References: <20051215080714.03919654@malmo.geotask.ch>
You could issue one query containing a
select uuid FROM MDM.KEYWORDS_INFO WHERE KEYWORDS_ID in (xy)
where xy is a large comma separated list of your values.
Best Regards / Viele Grüße
Sebastian Hennebrueder
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Johannes Bühler schrieb:
> Hi,
> I have a java.util.List of values (10000) which i wanted to use for a
> query in the where clause of an simple select statement. iterating
> over the list and and use an prepared Statement is quite slow. Is
> there a more efficient way to execute such a query. Thanks for any
> help. Johannes
> .....
> List ids = new ArrayList();
>
> .... List is filled with 10000 values ...
>
> List uuids = new ArrayList();
> PreparedStatement pstat = db.prepareStatement("SELECT UUID FROM
> MDM.KEYWORDS_INFO WHERE KEYWORDS_ID = ?"); for (Iterator iter =
> ids.iterator(); iter.hasNext();) { String id = (String) iter.next();
> pstat.setString(1, id);
> rs = pstat.executeQuery();
> if (rs.next()) {
> uuids.add(rs.getString(1));
> }
> rs.close();
> }
> ...
>
>
>
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To: pgsql-performance@postgresql.org
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Subject: Re: effizient query with jdbc
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