Hibernate One to One Mapping

Question

I have two class

Class Item
{
   private Auction CorrespondingAuction;
}

Class Auction
{
    private Item CurrentItem;
}

Can someone tell how to set this one to one mapping in XML, it must be bidirectional

Answer 1

In Auction XML FILE:

 <many-to-one name="CurrentItem" class="com.BiddingSystem.Models.Item" fetch="join"
            not-null="true" cascade="all" unique="true" lazy="false">
            <column name="CURRENTITEM" />
 </many-to-one>

In Item XML File:

<one-to-one name="auction" class="com.BiddingSystem.Models.Auction" property-ref="CurrentItem"/>

property-ref refers to the name of the variable corresponding to class item in the auction class

Answer 2

Bookmark this cheat sheet.This shows simple examples of all the mappings supported by Hibernate.

Answer 3

You need to have PK in common:

Class Item {
    @Id
    Long id;
    @OneToOne
    private Auction CorrespondingAuction;
}

Class Auction {
    @Id
    Long id;
    private Item CurrentItem;
}

The ID for Auction is taken from the ID already generated for Item