cayenne-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Michael Gentry <>
Subject Re: Child Contexts
Date Tue, 21 Sep 2010 20:26:19 GMT
What are you using to provide your DB Connection Pool: JNDI, DBCP, or
Cayenne?  What version of Cayenne are you using?


On Tue, Sep 21, 2010 at 3:03 PM,  <> wrote:
> Hey Michael and Robert,
> Ok so i got the difference between context and connection. So how can i
> close all connections before closing an application, a servlet or a
> portlet? My main problem here is that on each deploy of a new web
> application the connections from former deployments stay on (like memory
> leaks), and i need to close them or at least use one pool for the whole
> site.
> I was thinking about putting the Context on the HTTPSession of the
> application server or making a context that is used permanently by the
> server... Any ideas how to do it on liferay or tomcat?
> Thank you
> Bruno
>> Hi Bruno,
>> The Child DataContext *might* share the same database connection as
>> the Parent DataContext.  In general, you don't care about this,
>> though.  The DataContext, on commitChanges(), will request a database
>> connection, use that connection for performing the commit, then return
>> the connection back to the pool.  It isn't required that the same
>> database connection be used between a performQuery() and a
>> commitChanges().
>> If you do commitChanges() on a Child DataContext, it pushes the
>> changes to the Parent DataContext and to the database.  If you only
>> want the changes to go to the Parent DataContext and *not* the
>> database, use commitChangesToParent().
>> mrg
>> On Tue, Sep 21, 2010 at 2:22 PM,  <> wrote:
>>> Hello all,
>>> Do Child Contexts share the connection of a parent connection? When i do
>>> a
>>> commitChanges on the child the change is made on the database or in the
>>> parent? I have already read the Nested Contexts page on the User Guide
>>> but
>>> this detail was confusing for me.
>>> Thank you
>>> Bruno

View raw message