Returns the native, datastore-specific connection that this
connection wraps. In general, it is not recommended that this
native connection be used directly, since the JDO
implementation has no way to intercept calls to it, so it is
quite possible to put the PersistenceManager's
connection into an invalid state.
the native connection
Returns this connection to the JDO implementation.
The object must be returned to the JDO implementation prior to
calling any JDO method or performing any action on any persistent
instance that might require the JDO implementation to use a
connection. If the object has not been returned and the JDO
implementation needs a connection, a JDOUserException