Hello,
I have some 1..n relations and some 0..n relations between tables in my data model.
Is there a mechanism in JPA that allows to map such relations?
First example: table Person and table ID Card.
One Person can have many ID
Cards, if he/she has more than one nationality.
One Person MUST have at leat one ID Card.
An ID Card MUST belong to exactly one Person - it cannot have more than one owner and cannot exist without owner at all.
Additlonally, I want it to implement in a way that ID Card 'knows' who owns it, and Person doesn't 'know' about ID Card.
So the relation is: Person (1) ------------------> (1..n) IDCard
Second example: table Person and table Passport.
The only difference is that a Person doesn't have to have a Passport.
So the relation is: Person (1) ------------------> (0..n) IDCard
How to make such distinction between 1..n and 0..n using JPA?