Hi,
You could write your own ConnectionFactory
http://db.apache.org/ojb/docu/guides/connection.html
And execute the appropriate statement in the lookup method.
E.g.
public class MyConnectionManager extends ConnectionFactoryDBCPImpl {
public Connection lookupConnection(JdbcConnectionDescriptor jcd)
throws LookupException {
Connection con = super.lookupConnection(jcd);
if(con != null){
/* Execute the ALTER stataement here */
}
};
}
This would be executed every time a new connection was requested for the
Broker; this is probably overkill, but it is simple.
The more "correct" way of doing it would be to execute the SQL statement
when the connection is actually *created* - but where that is, depends
on which connection factory you are using.
Hope that's a pointer in the right direction for you...
Cheers,
Charles.
> -----Original Message-----
> From: Bruno CROS [mailto:[EMAIL PROTECTED]
> Sent: 10 October 2006 09:34
> To: OJB Users List
> Subject: Re: Monitoring DB cursor leaks
>
> http://oracleandy.blogspot.com/2006/03/vopencursor-find-cursor
> s-that-are.html
>
> Perhaps i found something to detect bad code, but i don't
> known how to set the session parameter in OJB connections.
> The equivalent of :
> alter session set "_close_cached_open_cursors" = TRUE
>
> Did someone already do ?
>
> Thanks
>
>
>
>
> On 10/10/06, Bruno CROS <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> >
> > Here is my connector, Oracle9i yet...
> >
> > May be i have to set the jdbc-level at 3.0 ?
> >
> > Referring to this article, it seems that it is a hard to
> resolve trouble.
> >
> > http://www.orafaq.com/node/758
> >
> > Except looking into code, how to check "real" cursors leak
> (if they are)?
> >
> > Regards
> >
> > <jdbc-connection-descriptor
> > jcd-alias="default"
> > default-connection="true"
> > platform="Oracle9i"
> > jdbc-level=" 2.0"
> > driver="oracle.jdbc.driver.OracleDriver"
> > protocol="jdbc"
> > subprotocol="oracle"
> > dbalias="thin:@XXXX:1521:ZZZZZ"
> > username="uuuuuuuuu"
> > password="pppppppp"
> > batch-mode="false"
> > useAutoCommit="1"
> > ignoreAutoCommitExceptions="false"
> > >
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: Danilo Tommasina <[EMAIL PROTECTED] >
> > Date: Oct 9, 2006 6:08 PM
> > Subject: Re: Monitoring DB cursor leaks
> > To: OJB Users List <[email protected]>
> >
> > Hi,
> >
> > we were having that problem too, long time ago. You should use the
> > 'Oracle9i' Platform setting in your
> jdbc-connection-descriptor instead
> > of the Oracle 'Platform', that should fix the problem. IIRC the
> > 'Oracle' Platform does a caching of PreparedStatements, however the
> > Oracle Driver has its own PreparedStatements cache, having
> this double
> > caching causes too many cursors to stay open.
> > The Oracle9i Platform should not make use of the local
> > PreparedStatements cache.
> > Furhtermore the 'Oracle9i' offers better performance and correct
> > handling for BLOBs > 4kB, for 9i or later Oracle versions.
> >
> > Good luck
> > cheers
> > Danilo
> >
> > Bruno CROS wrote:
> > > Hi all,
> > >
> > > Experiencing some MAX OPEN CURSOR oracle errors (ORA
> -01000) , i'm
> > looking
> > > for the cursors leaks ( unclosed ResultSet it seems) in code.
> > >
> > > I guess that broker queries well close the result set. So when
> > > report queries results iteration are closed ? on
> HasNext()==false ?
> > >
> > > Is it possible to check open cursors when releasing connections ?
> > > and by
> >
> > > the
> > > way, close them if needed ?
> > >
> > > Note : MAX_OPEN_CURSOR Oracle parameter is actually set at 500 by
> > > connection ( and 1000 sooner )
> > >
> > > Oracle 10, OJB 1.0.4 with some litle updates
> > >
> > > Regards.
> > >
> >
> >
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> >
> >
> >
>
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