Creating Entity within a view

Question

I have a View with two entities, Person and Address. The first has a foreign key identifying the Address entity and the view works fine. The reason for two Entities is that Addresses may be owned by other Entities too.
I want to write a method on the ViewPersonImpl that creates a new EntityAddress and links the PersonEntity to it. This represents a change of address of the Person.
It seems I have to do the following.
1) Create EntityPersonDefImpl.java
2) Write a public createInstance method that just calls EntityDefImpl.createInstance().
3) In ViewPersonImpl.changeAddress(), call this method and set the Person.AddressId attribute to the appropriate value from the returned Entity.
My first question is why I have to go to such lengths (steps 1 & 2) when I expected to only have to do step 3. Put another way, why is EntityDefImpl.createInstance() protected?
Secondly, after setting the AddressId, the method getEntityAddress() still returns the original EntityAddress. What more must I do to make this method return the new EntityAddress?
Code snippet:
EntityAddressesImpl lNewAddress = getEntityAddresses().cloneIt();
setAddressId(lNewAddress.getId());
if (lNewAddress != getEntityAddresses())
{   System.err.println("Entity not seen " + lNewAddress + ", " + getEntityAddresses());
Output:
Entity not seen Entity [oracle.jbo.Key[2187 ]], Entity [oracle.jbo.Key[2152 ]]
I've discovered that I can execute this code:
setEntity(1, lNewAddress);
Then everything seems to be plumbed correctly, but I must know that EntityAddresses is Entity #1. There is no setEntityAddresses(EntityAddressesImpl) method analagous to getEntityAddresses().
Is this the correct solution?
How do I discover an Entity's index?
Tony.

Answer 1

Hi,
A view is just a query stored in Oracle, you cannot have a index on a view, you can create on the table on which the view is based.
thanks