Hi,

In our project we use hibernate annotation. Where in we have a requiremet of manytomany relationship . for example ,
There is employee class with
@Entity
@Table(name="Employee")
public class Employee implements Serializable {

private int empId;
private String empName;
private List<ProjectVo> projects;

@Column(name = "Emp_Name")
public String getEmpName() {
return empName;
}


@Id
@Column(name = "Emp_Id")
public int getEmpId() {
return empId;
}


@ManyToMany // (cascade = {CascadeType.PERSIST, CascadeType.MERGE})

@JoinTable(
name="EMP_PROJ",
joinColumns={@JoinColumn(name="Emp_Id", referencedColumnName="Emp_Id")},
inverseJoinColumns={@JoinColumn(name="PROJ_ID", referencedColumnName="PROJ_ID")})

public List<ProjectVo> getProjects() {
return projects;
}

......

}

And a project class ,
@Entity
@Table(name="ProjectVo")

public class ProjectVo implements Serializable {
private int projectId;
private String projectName;
private List<Employee> employee;


@Column(name="Project_Name")
public String getProjectName() {
return projectName;
}


@ManyToMany(mappedBy="projects")
public List<Employee> getEmployee() {
return employee;
}

@Id
@Column(name="PROJ_ID")
public int getProjectId() {
return projectId;
}

......
}

This will create new table 'EMP_PRJ' with primary keys of 2 tables forming filed in new table (i.e emp_id,project_id).

Our requirement is to add one more column to the 'EMP_PRJ' ,that the mapping table. How we can achieve this .


Thanks in advance
pallavi

Hi,

may, you are still locking for a solution ...

please visit:

http://en.wikibooks.org/wiki/Java_Persi ... nnotations