Dependant Entity uses DAO: shared Connection with all DAO's?

[Curt Smith]

Just re-validating a design requirement for BMP that I think
I read somewhere:

Dependant objects behind an Entity that uses DAOs for each
parent and child objects.

- for container managed transactions to work, must all DAOs
  use the same Connection?

I.E.

myBeanMethod (,,,)
{
        Connection con = null;

        try {
        // conn pool managed by J2EE container
        // and data-sources.xml

        Connection con = getDBcon();
        
        doDAOforTableA ( ,,, con);

        doDAOforTableB (,,, con);

        } finally {
        freeDBcon (con);
        }
}

Thanks,

curt