Difference between closing the connection before and after committing user transaction?

Question

          I was wondering what's the difference between closing the connection before committing
          the transaction versus closing the connection after committing the transaction?...
          for e.g....
          Scenario 1.........
          UserTransaction useretran;
          usertran.begin();
          Connection con = datasource.getCOnnection();
          // do bunch of stuff...
          conn.close();
          usertran.commit()
          Scenario 2...
          UserTransaction useretran;
          usertran.begin();
          Connection con = datasource.getCOnnection();
          // do bunch of stuff...
          usertran.commit()
          conn.close();
          thanks....
          Srini
          

Answer 1

Hi. As long as you're sure there's a transaction going on, and the connection
is a transaction-aware object (from a TxDataSource), either will be fine.
In the first scenario the actual semantics of the close() call are less than
normal, because we really don't close the connection or return it to the
pool until the actual transaction commits, and in the second case, we have
already taken the connection out of your service as of the commit().
The second scenario is the usual coding style. If there's ever a chance your
code will get non-transaction-aware connections, it is crucial to close
connections, and I always recommend putting the close() in a finally block
so it's guaranteed to happen.
Joe
srinivas wrote:
I was wondering what's the difference between closing the connection before committing
the transaction versus closing the connection after committing the transaction?...
for e.g....
Scenario 1......... UserTransaction useretran; usertran.begin(); Connection con =
datasource.getCOnnection(); // do bunch of stuff... conn.close(); usertran.commit()
Scenario 2... UserTransaction useretran; usertran.begin(); Connection con = datasource.getCOnnection();
// do bunch of stuff... usertran.commit() conn.close();
thanks....
Srini