Hello,
I am trying to implement an unusual Inheritance mapping by which both super & subclasses are @Embedded in another @Entity. Let me explain with actual code:
I have a Request object:
Code:
@Entity
public class Request {
…
…
private DealType dealType;
…
…
@Embedded
public DealType getDealType() {
return dealType;
}
}
an abstract DealType superclass:
Code:
@Embeddable
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DEAL_TYPE_DISCRIMINATOR", discriminatorType = DiscriminatorType.STRING)
public class DealType {
private BigDecimal quotedAmount;
public DealType(){}
protected DealType(BigDecimal quotedAmount) {
this.quotedAmount = quotedAmount;
}
public BigDecimal getQuotedAmount() {
return quotedAmount;
}
public void setQuotedAmount(BigDecimal quotedAmount) {
this.quotedAmount = quotedAmount;
}
}
and a subclass UnitBasedDealType:
Code:
@Embeddable
@DiscriminatorValue("UNIT_BASED")
public class UnitBasedDealType extends DealType {
private int numberOfUnits;
public UnitBasedDealType(BigDecimal amount, int numberOfUnits) {
super(amount);
this.numberOfUnits = numberOfUnits;
}
public int getNumberOfUnits() {
return numberOfUnits;
}
public void setNumberOfUnits(int numberOfUnits) {
this.numberOfUnits = numberOfUnits;
}
}
All properties of both DealType & UnitBasedDealType are defined inside the Request table.
When I try to save a UnitBasedDealType like this:
Code:
…
Request request = new Request();
request.setCreationDate(new Date());
request.setDealType(new UnitBasedDealType(new BigDecimal("44.55"), 4));
session.save(request);
…
the only properties that get saved are the DealType ones (which is the quotedAmount) and none of the UnitBasedDealType ones (which for this example is numberOfUnits).
Does anyone know if this type of mapping is possible with Hibernate?
Any thoughts?
I appreciate this might not be the best way to use Inheritance mapping but I'm working with a legacy schema.
Regards,
- Savvas
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