> -----Original Message-----
> From: Ashwath Narayan [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, April 27, 2000 2:42 PM
> To: [EMAIL PROTECTED]
> Subject: Re: EJB Design: entity beans and domain objects
>
>
> Richard,
>
> Consider a situation in my application.
> I have a BillingAccount object. BillingAccount has Customer,
> ContactDetails
> etc.
> Customer has an Address. ContactDetails also an Address.
>
> Our design might be primitive. We have gone for fine-grained CMP
> entitybeans viz BillingAccount, Customer, ContactDetails and Address.
> Out database has corresponding tables viz BillingAccount, Customer,
> ContactDetails and Address.
> customerId and contactDetailsID are foreign keys in
> BillingAccount table.
> addressId is a foreign key in both Customer and ContactDetail tables.
>
> According to the (coarse-grain) pattern suggested in this
> thread, I should
> be wrapping Address into Customer EJB and ContactDetails EJB
> ie I need not
> have an Address EJB.
>
> But how can I have a CMP Customer EJB which will manage
> persistence of two
> tables - Customer and Address?
> My understanding is that a CMP EJB can represent only one
> table (unless I
> insert my own JDBC calls inside the CMP bean).
> I am using WebLogic. It WebLogic Deployment Descriptor, I
> can point a CMP
> EJB to only one database table.
>
This is a limitation of the EJB Container your actually using, not a
limitation of the spec. Most built-in CMP of the available appservers have
very limited abilities. The CMP engine I use (which replaces the CMP of the
IAS) can spread one entity bean over multiple tables (but it's only
available in germany at the moment). I think Toplink should also be able to
do that.
Ulf Gohde
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