JPA multiple relationships/associations between same entities

Question

I want to have a Person entity that has two bi-directional relationships to the Name entity: name and aliases.
I have implemented it like so:
@Entity(access = AccessType.FIELD)
public class Person
     @OneToOne(cascade=CascadeType.ALL,fetch=FetchType.EAGER,mappedBy="person_name")
     Name name;
     @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER,mappedBy="person_aliases")
     private List<Name> aliases = new ArrayList<Name>();
@Entity(access = AccessType.FIELD)
public class Name
     @OneToOne
     private Person person_name;
     @ManyToOne
     private Person person_aliases;
     public Person getPerson() {
          return getPerson_name() != null ? getPerson_name() :
               getPerson_aliases();
}This seems to work, but I�m wondering if there�s a better way to do it. I don�t like the multiple Person properties in the Name entity.
Thanks

Answer 1

Your table design is completly wrong. I am now sure how you are maintaining OrderDate table. SQL Server is RDBMS. Without relation how will you pick those rows from Order table whose order date is equal exactly equal to datefield in OrderDate table. The
only way is to derived endofDay and endofMonth in the select query directly. I understand endofMonth. But what is EndofDay ? And that too a date datatype ??
You can run the below query but it will not return specific order date from order table,
SELECT * FROM [ORDER] WHERE
CONVERT(CHAR(10),ORDERDATE,101) IN (SELECT CONVERT(CHAR(10),endOfDay,101) FROM ORDERDATE)
SELECT * FROM [ORDER] WHERE
CONVERT(CHAR(10),ORDERDATE,101) IN (SELECT CONVERT(CHAR(10),endOfMonth,101) FROM ORDERDATE)
Even if i JOIN the two table by orderdate and endofDay/endofMonth, we will not received specific orderDate. And this is becouse if your Order table contains multiple orderDate that are matching to either endofDay or endofMonth, the final output will contain
multiple orderDate details. I don't think this is what you need. Therefore you need to modify the OrderDate table or provide us the definition for endofDay and endofMonth, and how are you maintaining.
Regards, RSingh