> Any link ? http://openjpa.apache.org/faq.html#FAQ-HowdoIenableconnectionpoolinginOpenJPA%253F
Jean-Baptiste BRIAUD -- Novlog wrote: > > Thanks. > > On Sep 28, 2009, at 16:18 , Rick Curtis wrote: > >> >> http://commons.apache.org/dbcp/configuration.html >> >> >> Jean-Baptiste BRIAUD -- Novlog wrote: >>> >>> OK, it works but I'd like to set more options in the persistence.xml >>> like the pool size. I didn't find how to set that up. Any link ? >>> >>> Thanks. >>> >>> On Sep 28, 2009, at 15:32 , Rick Curtis wrote: >>> >>>> I'd suggest using DBCP for connection pooling when not running in a >>>> JEE >>>> environment. Checkout this blog post [1] that I wrote about this >>>> very issue >>>> a few months back. >>>> >>>> -Rick >>>> >>>> [1] >>>> http://webspherepersistence.blogspot.com/2009/01/jpa-connection-pooling.html >>>> >>>> On Mon, Sep 28, 2009 at 3:53 AM, Jean-Baptiste BRIAUD -- Novlog < >>>> [email protected]> wrote: >>>> >>>>> OK, so is there a way to have add pool behavior with only JDBC >>>>> (without >>>>> J2EE) ? >>>>> >>>>> >>>>> >>>>> On Sep 28, 2009, at 05:04 , C N Davies wrote: >>>>> >>>>> The doc says: >>>>>> >>>>>> "EntityManagerFactory instances are heavyweight objects. Each >>>>>> factory >>>>>> might >>>>>> maintain a metadata cache, object state >>>>>> cache, EntityManager pool, connection pool, and more." >>>>>> >>>>>> "2.6.3. openjpa.jdbc.DriverDataSource >>>>>> Property name: openjpa.jdbc.DriverDataSource >>>>>> Configuration API: >>>>>> org.apache.openjpa.jdbc.conf.JDBCConfiguration.getDriverDataSource >>>>>> Resource adaptor config-property: DriverDataSource >>>>>> Default: pooling" >>>>>> >>>>>> "In its default configuration, OpenJPA obtains JDBC connections on >>>>>> an >>>>>> as-needed basis. OpenJPA EntityManagers do not retain >>>>>> a connection to the database unless they are in a datastore >>>>>> transaction or >>>>>> there are open Query results that are using a live >>>>>> JDBC result set. At all other times, including during optimistic >>>>>> transactions, EntityManagers request a connection for each >>>>>> query, then immediately release the connection back to the pool." >>>>>> >>>>>> >>>>>> -----Original Message----- >>>>>> From: Christopher Giblin [mailto:[email protected]] >>>>>> Sent: Monday, 28 September 2009 1:11 AM >>>>>> To: [email protected] >>>>>> Subject: relationship EntityManager and JDBC Connection? >>>>>> >>>>>> >>>>>> Hi, >>>>>> >>>>>> Does an EntityManager instance correspond one-to-one to a JDBC >>>>>> connection? >>>>>> When the EM is closed, is the JDBC connection closed? That is, by >>>>>> opening >>>>>> and closing EMs, is one also opening and closing JDBC connections? >>>>>> >>>>>> I am using OpenJPA with Derby. There is no connection pooling: >>>>>> >>>>>> <property name="openjpa.ConnectionDriverName" value= >>>>>> "org.apache.derby.jdbc.ClientDriver"/> >>>>>> >>>>>> Sorry if I overlooked in the excellent documentation. >>>>>> >>>>>> Thanks,chris >>>>>> >>>>>> >>>>>> >>>>> >>> >>> >>> >> >> -- >> View this message in context: >> http://n2.nabble.com/relationship-EntityManager-and-JDBC-Connection-tp3720848p3729669.html >> Sent from the OpenJPA Users mailing list archive at Nabble.com. >> > > > ----- Pinaki -- View this message in context: http://n2.nabble.com/relationship-EntityManager-and-JDBC-Connection-tp3720848p3740481.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
