Hi there,
The DB I'm working on has a generic table called REF_CODES to store all types of codes and their descriptions. eg, address type, contact type ect.
Code:
schema of REF_CODES:
domain, code, description (domain and code are pk columns)
example data
add_type, P, postal
add_type, R, residential
contact_type,G, general
contact_type,O, other
what I wanted to do is do inheritance mapping as follow:
Code:
@Entity
@Table(name = "ref_codes")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "domain")
public abstract class RefCodes {
@EmbeddedId
private RefCodesId id;
@Embeddable
private class RefCodesId implements Serializable {
@Column(name = "domain")
private String domain;
@Column(name = "code")
private String code;
}
}
@Entity
@DiscriminatorValue(value = "add_type")
public class AddressType extends RefCodes implements Serializable {
@Column(name = "code")
private String code;
@Column(name = "description")
private String description;
}
And then the AddressType can be used by Address class in ManyToOne mapping as follow;
Code:
@Entity
@Table(name = "addresses")
public class Address implements Serializable {
private String name;
@ManyToOne
@Joincolumn(name = "add_type_code")
private AddressType type;
}
The problem I'm having is that in Address class the ManyToOne mapping to AddressType needs to join 2 columns as AddressType(RefCode) has a composite PK, but the Address table only stores address code, how do I let the join query know the value of the domain as 'add_type' then.
Or, is there a way to override the id of AddressType class as 'code'?
Is this mapping doable? Thanks.
Code:
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