Обсуждение: Upgrading jdbc

Hello!

I'm trying to upgrade to the current jdbc.
I tried both jdbc3 and jdbc4.

Until now we've been using pg74.215.jdbc3.jar.
The code is using methods that need a ResultSet with a Type different than
TYPE_FORWARD_ONLY. In the 7.4-version this seems to be standard.

For the new one I need to do:
PreparedStatement stmnt =
connection.prepareStatement(JDBCEscSeq.convertEscSeq(sqlStmnt, objs),
java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,
java.sql.ResultSet.CONCUR_READ_ONLY);
for the code to function as before.

So far this works. Unfortunately the execution of some statements is
extremly slow.
I identified "org.postgresql.core.v3.QueryExecutorImpl.receiveFields()" as the
point where the time is spent.

I'm using JDK 1.6.

Are there any hints I'm missing, any settings I need to set?

Thanks for advise, H. Wurth

hw 'at' solvedirect.com writes:

> Hello!
>
> I'm trying to upgrade to the current jdbc.
> I tried both jdbc3 and jdbc4.
>
> Until now we've been using pg74.215.jdbc3.jar.
> The code is using methods that need a ResultSet with a Type different than
> TYPE_FORWARD_ONLY. In the 7.4-version this seems to be standard.
>
> For the new one I need to do:
> PreparedStatement stmnt =
> connection.prepareStatement(JDBCEscSeq.convertEscSeq(sqlStmnt, objs),
> java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,
> java.sql.ResultSet.CONCUR_READ_ONLY);
> for the code to function as before.
>
> So far this works. Unfortunately the execution of some statements is
> extremly slow.

You may hit a problem with the protocol version 3 and prepared
statements with variable parameters.

http://archives.postgresql.org/pgsql-jdbc/2009-03/msg00027.php

--
Guillaume Cottenceau