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 Post subject: page 336
PostPosted: Sat Jan 06, 2007 5:40 pm 
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Beginner

Joined: Thu Nov 30, 2006 3:00 pm
Posts: 20
The text from the figure 8.1 says "A composite foreign key references a composite primary key." souldn't it be "... references a composite natural key."?

regards.


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 Post subject:
PostPosted: Sat Jan 06, 2007 6:08 pm 
Hibernate Team
Hibernate Team

Joined: Mon Aug 25, 2003 9:11 pm
Posts: 4592
Location: Switzerland
It's indeed a wrong caption, but it should be "A composite foreign key references a composite unique key". Added to errata.

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 Post subject:
PostPosted: Mon Feb 18, 2008 4:13 pm 
Newbie

Joined: Thu Feb 14, 2008 10:43 pm
Posts: 8
christian wrote:
It's indeed a wrong caption, but it should be "A composite foreign key references a composite unique key". Added to errata.


The solution proposed on page 336 can be implemented with annotation ?

All my search on internet has failed.
It seem that not exist a "A composite foreign key references a composite unique key" example with annotation


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 Post subject: Page 336
PostPosted: Thu Mar 20, 2008 10:41 am 
Newbie

Joined: Thu Mar 20, 2008 10:39 am
Posts: 4
I am in desperate need of a JPA solution for the XML provided in the page 336. Any help!


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 Post subject: using JPA annotations
PostPosted: Fri Mar 28, 2008 4:08 pm 
Newbie

Joined: Thu Mar 27, 2008 10:50 am
Posts: 13
Item...
Code:
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.ManyToOne;

@Entity
public class Item {
   @Id
   private long item_id;

   private double price;
   
   @ManyToOne
   @JoinColumns({
      @JoinColumn(name="seller_firstName", referencedColumnName="firstName", updatable=false),
      @JoinColumn(name="seller_lastName", referencedColumnName="lastName", updatable=false),
      @JoinColumn(name="seller_birthday", referencedColumnName="birthday", updatable=false)
   })
   private User seller;
}


User...
Code:
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;

@Entity
@Table(name="Users", uniqueConstraints = {@UniqueConstraint(columnNames = {"firstName", "lastName", "birthday"})})
public class User {
   @Id
   private long user_id;
   
   private String firstName;
   private String lastName;
   private Date birthday;
   
   private String username;
   
   @OneToMany(mappedBy="seller")
   private Set<Item> itemsForAuction = new HashSet<Item>();
}


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 Post subject:
PostPosted: Fri Mar 28, 2008 5:27 pm 
Newbie

Joined: Thu Mar 20, 2008 10:39 am
Posts: 4
Thanks!


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