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From: "vivek" <vivekmv@geojit.com>
To: <dev@openjpa.apache.org>
Subject: Regarding Fetch groups in OpenJPA
Date: Thu, 18 Oct 2007 12:00:24 +0530
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Problem :Regarding Fetch groups in OpenJPA.

 
public class EmployeePK {

 
@Column(name = "EmployeeID", nullable = false)

 
private long employeeID;

 
@Column(name = "SerialNo", nullable = false)

 
private int serialNo;

 
}

 
public class Employee {

 
@EmbeddedId

 
protected EmployeePK employeePK;

 
private String firstName;

 
private String lastName;

 
@ManyToOne private Department dept;

 
}

 
public class Department {

 
@Id private int id;

 
private String departmentName;

 
}

 
This is the sample scenario.

There are 3 entity classes, one is the primary key class.

Here normally if i am not using fetch group feature in OpenJPA, during
retrieval all fields will retrieved from employee and department tables.

But i need some fields from both the tables to be fetched first.

By seeing fetch group documentation, i couldnt get a full idea of how to
configure fetch groups for related entities.

So please give a sample configuration for the above scenario.


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