Win a copy of The Journey To Enterprise Agility this week in the Agile and Other Processes forum! And see the welcome thread for 20% off.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Jeanne Boyarsky
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
Sheriffs:
  • Paul Clapham
  • Junilu Lacar
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Ganesh Patekar
  • Tim Moores
  • Pete Letkeman
  • Stephan van Hulst
Bartenders:
  • Carey Brown
  • Tim Holloway
  • Joe Ess

@ManyToOne RelationShip  RSS feed

 
Greenhorn
Posts: 10
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Every buddy
I am getting problem in ManyToOne Relationship.I am not getting that how to call entity.persist()from client.Because there will be two object of owing side class.
My proble is like this....

public class Person implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "ID", nullable = false)
private Long id;
@ManyToOne(cascade={CascadeType.ALL})

@JoinTable(name="Cu_Ad",
joinColumns={@JoinColumn(name="CustomerID")},
inverseJoinColumns={@JoinColumn(name="AddressID")})
private Address address=new Address();
...
}

public class Address implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "ID", nullable = false)
private BigDecimal id;
.....
}

Client Or servlet{

String fname=request.getParameter("fname");
String lname=request.getParameter("lname");
String city=request.getParameter("city");
String country=request.getParameter("country");

Address d=new Address();
d.setCountry(country);
d.setCity(city);

Pankaj p1=new Pankaj();
p1.setFirstname(fname);
p1.setLastname(lname);
p1.setAddress(d);

Pankaj p2=new Pankaj();
p2.setFirstname(fname);
p2.setLastname(lname);
p2.setAddress(d);

remote.CreateCruise(p1); remote.CreateCruise(p2);
}

My problem is i want in peson table two persons should be created whilw in Address table one value should go.
just please tell me wats worng in servlet class.
@OneToMany realtionship is working properly but this isn't.


I just want to create two pesons in person table & one address in Address table. please help me.........
 
Ranch Hand
Posts: 226
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Panki,

I'm new to EJB so may not be able to help you.

If you have a ManyToOne relationship, that means that there are many entities owning the relationship to a single entity. In that case, why bother with a join table?
AFAIK, the join table is only required for the OneToMany relationship (where one entity owns a relationship to many others - but only has a single space in it's row).

MG
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!