Anyone know of a GENERIC (NOT DBCP SPECIFIC) algorithm for testing to
see if a connection needs to be reset before the pool hands it out
without making a query?
--Angus
-Original Message-
From: Andy Eastham [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 09, 2003 11:24 AM
To: Tomcat Users List
Subject: RE: [OFFTOPIC??] RE: dbcp connection and database restart
Angus,
You can call Conection.isClosed(), but the documentation
suggests that this
is not a reliable method of telling that it is _definitely_ closed.
However, if it does return true, you know that you should
reconnect before
attempting a call with the connection.
Andy
-Original Message-
From: Angus Mezick [mailto:[EMAIL PROTECTED]
Sent: 09 July 2003 15:53
To: Tomcat Users List
Subject: [OFFTOPIC??] RE: dbcp connection and database restart
Is there a better way of doing this? Even if I 'select 1
from TABLE' I
don't like the fact that there is an extra DB communication
for every
connection I get from the pool. I don't know if there are
alternatives
to this in DBCP but are there any other ways to ask if a
connection in a
pool is still valid besides just running a query and seeing
if it fails?
(in general, NOT in dbcp)
--Angus
-Original Message-
From: Raible, Matt [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 09, 2003 8:49 AM
To: 'Tomcat Users List'
Subject: RE: dbcp connection and database restart
Try adding a validation query, for example:
parameter
namevalidationQuery/name
valueSELECT * FROM USER_TABLE/value
/parameter
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 09, 2003 6:46 AM
To: [EMAIL PROTECTED]
Subject: dbcp connection and database restart
I've configured my jdbc datasource connection pool(using dbcp) in
Tomcat
4.1.18
server.xml file.
here is an extract of it.
ResourceParams name=jdbc/intranetMail
parameternameusername/namevalueXXX/value/parameter
parameternamepassword/namevalueXXX/value/parameter
parameternamedriverClassName/name
valuecom.sybase.jdbc2.jdbc.SybDriver/value/parameter
parameternameurl/name
valuejdbc:sybase:Tds:s198000SGD1:5000/intranet_mail/value
/parameter
/ResourceParams
Everything works fine. But
when our database server is restarted, I have to restart
Tomcat too
in order to aquire connections from my defined pool.
I wonder if there is a manner to avoid restarting Tomcat when
the database server is restarted.
I have added the parameters below to my pool config.
parameter
nameremoveAbandoned/name
valuetrue/value
/parameter
parameter
nameremoveAbandonedTimeout/name
value60/value
/parameter
I recognize ,I've added that quite blindly.
Can someone confirm me if this is a cure to my problem ?
any suggestion is greatly appreciated.
Meissa
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