Problem about mapping 1 column with different tables..

Hi,
I have 3 Tables (I will give examples not exact tables but same structure and logic)
Cars :
   ID ( Car ID)
   Name
Planes :
   ID ( Plane ID)
   Name
Processes :
   ID ( Process ID )
   Type
   VehicleID {code}*Sample Processes Table Data*
{code:java}ID     Type      VehicleID
1          1               1
2          1               2
3          2               1
3          2               2{code}
When type is *1*, This is *Car* and means that *VehicleID* maps to *Cars Table*,
When type is *2*, This is *Plane* and means that *VehicleID* maps to *Planes Table*.
And So On 3, 4, 5, 6 .. for Additional tables.
How can i map something like that? I can not merge these tables, they all must be separated..
I used to handle this by writing native SQL with some functions, however with JPA i could not figure it out..
Thanks again
Regards.

I do not know an easy way to do this in pure JPA. EclipseLink though is able to do this using a variable one to one mapping:
http://wiki.eclipse.org/Introduction_to_Relational_Mappings_%28ELUG%29#Variable_One-to-One_Mapping
This can be set using a customizer or JPA like annotations:
@VariableOneToOne(
targetInterface=Vehicle.class,
cascade=PERSIST,
fetch=LAZY,
discriminatorColumn=@DiscriminatorColumn(name="TYPE", discriminatorType=INTEGER),
discriminatorClasses={
@DiscriminatorClass(discriminator="1", value=Cars.class),
@DiscriminatorClass(discriminator="2", value=Planes.class)
Best Regards,
Chris

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HTH
BR
Sierdna S.

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