Hibernate : Hibernate :Mapping Multiple Table for single POJO class

[sachin Misurkar]

Hi All,
I have requirement to map Different Table to one POJO class.
Example;
Table
1)Employee:
-EmpName
-EmpAddress
-EmpPhone

2)HealthDetails :
- Height
- Weight
- BloodGroup

I want create single POJO class which contains fields from Both table.
Pleasez suggest me How to do hibernate mapping(Mapping *.hbm.xml file) for such
scenario....

Thanks in Advance
regards
sachin misurkar

[Rodrigo Lopes]

Take a look at this

You must have something like:

<class name="Employee" table="EMPLOYEE">
    <id name="id" column="EMPLOYEE_ID">...</id>
    ...
    <join table="HEALTH_DETAILS">
        <key column="EMPLOYEE_ID"/>
        <property name="height"/>
        <property name="weight"/>
        <property name="bloodGroup"/>
    </join>
    ...

[sachin Misurkar]

Thank You Rodrigo

I also got solution.....

[Cameron Wallace McKenzie]

It's just as easy with annotations:

Mapping One Class to Two Tables: The Secondary Table!

One Class to Two Tables

From time to time, you'll run into a scenario where your application defines a single class, but the database maintains the correspoinding information in two separate tables. Well, with Hibernate, that's not a problem. All you have to do to map one class to two database tables is to define the first table mapping as you normally would, and then specify the name of the second table your class uses with the very intelligently named @SecondaryTable annotation. From there, when you get to a field that is supposed to be stored in the second table, well, you just mention the second table's name in the @Column annotation. It's all very simple and straight forward.

Here's a little scenario I map in a tutorial of mine. You'll notice that the code is pretty clean.

 
package com.examscam.mappings;
import javax.persistence.*;import org.hibernate.Session;
import com.examscam.HibernateUtil;
 
@Entity
@Table(name="bar")
@SecondaryTable(name="foo")
public class FooBar {
  int id;
  String fooName;
  String barCode;
 
  @Id
  @GeneratedValue
  public int getId() {return id;}
  public void setId(int id) {this.id = id;}
 
  @Column(table="foo")
  public String getFooName() {return fooName;}
  public void setFooName(String fooName) {
    this.fooName = fooName;
  }
 
  /* no need for mapping-goes to default bar table */
  public String getBarCode() {return barCode;}
  public void setBarCode(String barCode) {
    this.barCode = barCode;
  }
 
  public static void main(String args[]) {
/*HibernateUtil needs FooBar.class in AnnotationConfiguration*/
    HibernateUtil.recreateDatabase();
    FooBar fb = new FooBar();
    fb.setBarCode("90210");
    fb.setFooName("ManChu");
     Session session = HibernateUtil.beginTransaction();
    session.save(fb);
    HibernateUtil.commitTransaction();
  }
}
   

Mapping Tutorial

So there you go! It's as easy as using the SecondaryTable annotation!

-Cameron McKenzie

[Sandeep Vaid]

What if these 2 tables doesn't have same composite keys...
In this situation how can i map one class to these 2 tables ?