In your addEmp method i would add
dept.getEmployee().add(e)
after you instantiate your new employee object.
If i remember correctly, according to the JPA spec, managing relationships
is up to you.
BTW i would refactor the name of the list field "employee" to "employees"
(and its get and set method).
Regards,
Stephan
2010/2/17 Sushama Khadilkar <sush.khadil...@gmail.com>
> Thanks Stephan Hartmann,
> But there is another problem now .
> Does the DataStore will have a Foreign Key of Department in Employee?
> And , is it visible in the Employee table?
>
> Following are my POJO's ::::::
>
>
> /////////////////////////////////////Department///////////////////////////////////////////
>
> import java.io.Serializable;
> import java.util.List;
>
> import javax.persistence.Entity;
> import javax.persistence.GeneratedValue;
> import javax.persistence.GenerationType;
> import javax.persistence.Id;
> import javax.persistence.OneToMany;
>
> import com.google.appengine.api.datastore.Key;
>
>
> /**
> * @author Sushama Khadilkar.
> *
> * Create Date : 17-Feb-2010
> */
> @SuppressWarnings("serial")
> @Entity
> public class Department implements Serializable{
>
> @Id
> @GeneratedValue(strategy=GenerationType.IDENTITY)
> private Key dept_id;
>
> private String dept_name;
>
> private String head;
>
> @OneToMany(mappedBy="department")
> public List<Employee>employee;
>
>
> public Key getDept_id() {
> return dept_id;
> }
>
>
> public void setDept_id(Key dept_id) {
> this.dept_id = dept_id;
> }
>
>
> public String getDept_name() {
> return dept_name;
> }
>
>
> public void setDept_name(String dept_name) {
> this.dept_name = dept_name;
> }
>
>
> public String getHead() {
> return head;
> }
>
>
> public void setHead(String head) {
> this.head = head;
> }
>
>
> public List<Employee> getEmployee() {
> return employee;
> }
>
>
> public void setEmployee(List<Employee> employee) {
> this.employee = employee;
> }
>
>
>
>
> }
>
>
>
> //////////////////////////////////////////////////////////////Employee/////////////////////////////////////////////////////////
>
> import java.io.Serializable;
>
> import javax.persistence.CascadeType;
> import javax.persistence.Entity;
> import javax.persistence.GeneratedValue;
> import javax.persistence.GenerationType;
> import javax.persistence.Id;
> import javax.persistence.ManyToOne;
>
> import com.google.appengine.api.datastore.Key;
>
>
> /**
> * @author Sushama Khadilkar.
> *
> * Create Date : 17-Feb-2010
> */
> @SuppressWarnings("serial")
> @Entity
> public class Employee implements Serializable{
>
> @Id
> @GeneratedValue(strategy=GenerationType.IDENTITY)
> private Key emp_id;
>
> private String emp_name;
>
> private String emp_sal;
>
> @ManyToOne(cascade = CascadeType.ALL)
> private Department department;
>
>
> public Key getEmp_id() {
> return emp_id;
> }
>
>
> public void setEmp_id(Key emp_id) {
> this.emp_id = emp_id;
> }
>
>
> public String getEmp_name() {
> return emp_name;
> }
>
>
> public void setEmp_name(String emp_name) {
> this.emp_name = emp_name;
> }
>
>
> public String getEmp_sal() {
> return emp_sal;
> }
>
>
> public void setEmp_sal(String emp_sal) {
> this.emp_sal = emp_sal;
> }
>
>
> public Department getDepartment() {
> return department;
> }
>
>
> public void setDepartment(Department department) {
> this.department = department;
>
> }
>
>
>
>
> }
>
>
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