Hi,
In a single table inheritance strategy, would it be possible to use any
additional JPA mapping to define a discriminator strategy that will get
discriminator values in a different table ?
For example, from the given database schema and classes :
create table A (
ID integer primary key not null,
...
DISCR varchar,
) ;
@Entity
@Table(name = "A")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DISCR", discriminatorType =
DiscriminatorType.STRING)
public abstract class A {
...
}
@Entity
@DiscriminatorValue("foo")
public class B extends A {
...
}
if the database schema changes a little,
create table A (
ID integer primary key not null,
...
DISCR integer,
) ;
create table DISCRIMINATOR (
ID integer primary key not null,
...
VALUE varchar
) ;
would it be possible to change the DiscriminatorColumn annotation in the A
class to search for the discriminator value in DISCRIMINATOR.VALUE instead
of A.DISCR, assuming that A.DISCR will no longer contain string data but
DISCRIMATOR primary key ?
Thank you for your idea.
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