When you build a real system ( not a tutorial) you will recognize the
problem below.
If you have an Entity Bean and use CMP there must always be a unique
key. Where does it come from?
1) from the "user" (and passed as parameter to the create method)?
2) from the EJB-Container or some Session bean (how does it know it is
unique)?
3) from the database ( for example "max(col)" or "identity")?
In 1) and 2) you can assign the key in the create method.
But in 3) you must do a query or insert a row to get the key but how
can I tell the Container do do that. I am supposed to assign the key in
the create method.
Is there any standards for this problem?
Does this imply that example 3) must be implemented as BMP?
What is the best solution if it has to be scalable and shall work with
cluster of EJB-Servers?
Regards
Lars Hagrot
--
Lars Hagrot E-mail: [EMAIL PROTECTED]
Object Technology Mentoring Phone: +46 8 50714409
Enea Data AB Fax: +46 8 658 57 90
Hornsgatan 166
S-117 28 Stockholm
Sweden
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff EJB-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
