ejbs and concurrent access to share data

[Andreas Bauer]

Hi,

I read in a tutorial, that ejbs handle the concurrent access to data at
the database or object level and that the concurrency control is managed
by the EJB Container.
Is this only true for CMP Entity-Beans or is this also true if I have
stateless session beans, which connect directly to the database and
access the tables with with common prepared statements, resultsets, etc?

Regards,

Andi