Hi,
> 1. How do you map a entity container managed
> bean-field, which is not of java primitive type, but
> an instance of a composite class to database. The
> bean-field may require mapping to a table than a
> column. How can you do it ? Can I assume this is the
> limitation of CMP ?
>
> eg., for primitive data type mapping, which is fine.
>
> <object-link>
> <bean-field>beanyear</bean-field>
> <dbms-column>dbyear</dbms-column>
> </object-link>
1. There is no limitation on mapping an entity bean with composite datatypes
to db as of EJB specs. But ur App. server needs to provide the support to
map entity to Object RDBMS. It is totally dependent on the server vendor. I
suppose weblogic support this, though i m not sure.
> 2. Why does the multiple-result finder methods in the
> home interface of entity bean always return either a
> enumeration (JDK 1.1) and collection (JDK 1.2)
> interfaces ? Can't it return a Vector, HashMap classes
> ? Is there any restriction for the home interface ?
2. EJB 1.0 supported only Enumeration as the return type for multiple result
find methods.EJB 1.1 extended this to return Collection also. Probably we
can expect the support for other datastructures in future releases. As of
now, only the two are supported. This is indeed a restriction.
> 4. What is the necessity of ejbPostCreate() ? Is there
> any thing to be coded here for BMP ? What is the
> significance of this method ?
> 5. Can't you map an entity bean with CMP to more than
> one table ? Again is that the limitation ? Whether I
> need to go for BMP in this case ? Can someone show the
> possible ways to do this with CMP ? Whether all ejb
> containers support O-R mapping tools with CMP ?
Again, EJB does not have any restriction on this. It is upto the vendor to
support mapping an entity bean to more than one table and there are quite a
few vendors who do it.
Bye.
Rajesh.
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