Yes, or you could use instead:
<valid-connection-checker-class- 
name 
 >org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</ 
valid-connection-checker-class-name>
See the JBoss docs about datasources.

Florent

On 29 Oct 2008, at 14:53, Xavier Pétard wrote:

> Hi,
>
> It took me some time to find the right configuration for the unified  
> datasource (NuxeoDS) using MySQL.
> In $JBOSS_HOME/server/default/deploy/nuxeo.ear/datasources/unified- 
> nuxeo-ds.xml, there is a commented out PostgresSQL configuration.
>
> To use MySQL, apart from the driver, I changed this line:
> <check-valid-connection-sql>;</check-valid-connection-sql>
> to <check-valid-connection-sql>select count(*) from dual</check- 
> valid-connection-sql>
>
> Without this, I had recurring  
> "com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Query was  
> empty."
>
> Hope this helps.
>
>
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-- 
Florent Guillaume, Head of R&D, Nuxeo
Open Source, Java EE based, Enterprise Content Management (ECM)
http://www.nuxeo.com   http://www.nuxeo.org   +33 1 40 33 79 87

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