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Re: Number of rows in a ResultSet ?

From: Michael Stephenson <mstephenson(at)tirin(dot)openworld(dot)co(dot)uk>
To: <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re: Number of rows in a ResultSet ?
Date: 2001-01-18 14:42:06
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces
> I need to know how many rows exist in a ResultSet. I've tried to use
> getFetchSize() method of ResultSet interface, but a message was
> displayed "this method is not yet implemented".
> Anyone can help me ?

You could use:
  int numberOfRows = ResultSet.getRow();

Now, my understanding of this area is a but sketchy, but I think that
most implementations of ResultSet do not get all of the results in one go
(like the PostgreSQL JDBC driver does), so getFetchSize() is not a safe
way of determining the number of results returned.

Or, you could do another query with count() in your sql..

Or (and I wouldn't do this without carefully looking at the jdbc spec),
you could just alter the getFetchSize() method
org.postgresql.jdbc2.ResultSet driver to look like:

    public int getFetchSize() throws SQLException
	return rows.size();

The choice is yours..

Michael Stephenson      mstephenson(at)openworld(dot)co(dot)uk
Developer   -    Web Applications    -   Open World
Tel: +44 1225 444 950         Fax: +44 1225 336 738

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