Differences between JDBC vs. EE PMFs?

This is kind of a follow-up from my previous post on the LocalCache
problems I was having. It was suggested I should move from a EE PMF to
the JDBC pmf, since I was using JDO straight from Struts and manually
starting and closing transactions.
I was just wondering what are the main differences between the JDBC and
EE PMFs that could affect their behaviour?
I have noticed that when I have switched to using a
JDBCPersistenceManagerFactory, peformance degraded somewhat in my load
testing and I have been getting a large amount of dead locking
exceptions from SQL server (where previously these would never occur)?
I am using the LocalCache, and Kodo 2.3.4 in JBoss.
Kam

I was just wondering what are the main differences between the JDBC and
EE PMFs that could affect their behaviour?The only difference is that the EE PMF produces PersistenceManagers that
synchronize with the appserver's TransactionManager, whereas the JDBC PMF
just uses local JDBC transactions.

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What are the differences between javax.sql.datasource
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Is the datasource needed on in distributed databases
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>
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HusseinSawwan wrote:
Vijay.Cherukuri wrote:
Hi,
What is basic difference between JDBC and JRE?
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Message was edited by:
paulusazapakcom

Can you tell me what is Difference between Oracle9i
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please Reply me ASAP.
i am waiting for your replySuch lines are better avoided.

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In jdbc adapter what is the difference between insert and update insert

in jdbc adapter what is the difference between insert and update insert
Edited by: katru vijay on Mar 22, 2010 7:43 AM

Please refer to this Link [Document Formats for the Receiver JDBC Adapter|http://help.sap.com/saphelp_nw04/Helpdata/EN/22/b4d13b633f7748b4d34f3191529946/frameset.htm]
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Questions
=======
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2. What can be the impact of moving to Oracle drives from BEA on the overall application...?
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"1. What is the basic difference between these drivers and how do we decide which one to use."
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Thanks,
Raju

Hi Sree,
I have read literally ALL the online documents related to JDBC Data Source Factories
including the one you provided below, but I still do not understand what they
are for. I have also searched in Google but to no avail.
I will try to be more specific as to where my confusion lies.
1)Why would anyone ever choose a JDBCData Source Factory instead of a Tx Data
Source or plain vanilla (not XA) Data Source? EJBs connect just fine with the
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no where in the JNDI tree
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"Sree Bodapati" <[email protected]> wrote:
Hi Raju,
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Thanks
Please reply soon
amitindia

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Difference between connection = null and connection.close()

is it correct
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and f or
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"connection = null;" is just like any other similar Java statement, it removes that reference to the object. If that was the last reference to the object, then it becomes eligible for finalization and garbage collection, with no guarantee that either will actually occur. However, normal connection pool implementation will have a seperate reference to the connection and if the connection has not been returned, will most likely consider the connection to be "leaked" - allocated but never returned, and unusable.
connection.close(); is a normal JDBC connection method; it (usually) closes the associated objects and releases the connection; it's not uncommon to explicitly close statements and resultsets instead of depending on connection.close(). A connection pooling implementation that works by extending the Connection class MIGHT change the meaning of close() and instead of actually closing, return it to the pool instead. Personally, I would consider such an implementation to be evil and a blight on good programming practices; changing the action of such standard methods is bound to cause trouble, IMHO. More normally, if you were using connection pooling, you would NOT close the connection, but rather call some special method to return the connection to the pool.

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Howdy. I figure this is a newbie question, but I can't seem to find an
answer.
In the docs at bea, the datasource docs say
"DataSource objects provide a way for JDBC clients to obtain a DBMS
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connection pool. Each data source requires a separate DataSource object,
which may be implemented as a DataSource class that supports either
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In there it says the datasource uses the connection pool, but other than
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Thanks for the info. I think it makes some sense. But it's a bit greek.
I'm sure it'll make more sense the more I work with it. Thanks.
"Chuck Nelson" <[email protected]> wrote in message
news:3dcac1f5$[email protected]..
>
Peter,
Here is a more formal definition of a DataSource from the Sun site
"A factory for connections to the physical data source that thisDataSource object
represents. An alternative to the DriverManager facility, a DataSourceobject
is the preferred means of getting a connection. An object that implementsthe
DataSource interface will typically be registered with a naming servicebased
on the JavaTM Naming and Directory (JNDI) API.
The DataSource interface is implemented by a driver vendor. There arethree types
of implementations:
Basic implementation -- produces a standard Connection object
Connection pooling implementation -- produces a Connection object thatwill automatically
participate in connection pooling. This implementation works with amiddle-tier
connection pooling manager.
Distributed transaction implementation -- produces a Connection objectthat may
be used for distributed transactions and almost always participates inconnection
pooling. This implementation works with a middle-tier transaction managerand
almost always with a connection pooling manager.
Does that help clarify the distinction?
Chuck Nelson
DRE
BEA Technical Support

Differences between JDBC vs. EE PMFs?

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