Hi,

Im a newbie in hibernate and id like to implement a simple struts2+hibernate crud.
I
have a pb with the saveorUpdate() method. When I try to update the parent with new element in the child Set it reinit the child Set before updating.

I am a little bit lost, could u explain to me what's wrong in my code?

I have two classes with an onetomany association.

the parent is:

@Entity
@Table(name="MATRIX")
public class Matrix {
private Long id;
private String name;
private Columndef cldef = new Columndef();
private Set<Columndef> values = new HashSet<Columndef>(0);

@Id
@GeneratedValue
@Column(name="MATRIX_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="NAME")
public String getName() {
return name;
}
public void setName(String val) {
name = val;
}
@OneToOne(cascade = CascadeType.ALL)
public Columndef getCldef() {
return cldef;
}
public void setCldef(Columndef cl) {
cldef = cl;
}
@OneToMany(cascade = CascadeType.ALL)
@JoinTable(name = "MATRIX_COLUMNDEF", joinColumns = { @JoinColumn(name = "MATRIX_ID") }, inverseJoinColumns = { @JoinColumn(name = "COLUMNDEF_ID") })
public Set<Columndef> getValues() {
return values;
}
public void setValues(Set<Columndef> lst) {
if (lst != null) {
if (lst.size() > 0) values = lst;
}
}
public void addValue(Columndef cl) {
values.add(cl);
}
}

and the child is:

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinTable;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="MATRIX")
public class Matrix {
private Long id;
private String name;
private Columndef cldef = new Columndef();
private Set<Columndef> values = new HashSet<Columndef>(0);

@Id
@GeneratedValue
@Column(name="MATRIX_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="NAME")
public String getName() {
return name;
}
public void setName(String val) {
name = val;
}
@OneToOne(cascade = CascadeType.ALL)
public Columndef getCldef() {
return cldef;
}
public void setCldef(Columndef cl) {
cldef = cl;
}
@OneToMany(cascade = CascadeType.ALL)
@JoinTable(name = "MATRIX_COLUMNDEF", joinColumns = { @JoinColumn(name = "MATRIX_ID") }, inverseJoinColumns = { @JoinColumn(name = "COLUMNDEF_ID") })
public Set<Columndef> getValues() {
return values;
}
public void setValues(Set<Columndef> lst) {
if (lst != null) {
if (lst.size() > 0) values = lst;
}
}
public void addValue(Columndef cl) {
values.add(cl);
}
}

My action is:

public class MatrixAction extends ActionSupport implements ModelDriven<Matrix> {
/**
*
*/
private static final long serialVersionUID = -2662966220408285700L;

private Matrix cl = new Matrix();
private List<Matrix> clList = new ArrayList<Matrix>();
private MatrixDAO clDAO = new MatrixDAOImpl();
private Set<Columndef> lst = new HashSet<Columndef>();
private List<Columndef> lst2 = new ArrayList<Columndef>();

@Override
public Matrix getModel() {
return cl;
}

/**
* To save or update cl.
* @return String
*/
public String saveOrUpdate()
{
clDAO.saveOrUpdateMatrix(cl);
return SUCCESS;
}

and my DAO is:

public class MatrixDAOImpl implements MatrixDAO {

@SessionTarget
Session session;

@TransactionTarget
Transaction transaction;

@Override
public void saveOrUpdateMatrix(Matrix cl) {
try {
session.saveOrUpdate(cl);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
If I add a new element to the cl.values Set I can check that the cl.values is correct before the saveOrUpdate() method. But unfortunately it doesn' save the updated cl.values Set in DB.

thks in advance,

bruno

I made a mistake in the previous post, the Child is:

@Entity
@Table(name="COLUMNDEF")
public class Columndef {
private Long id;
private String name;
private Set<Stringclass> values = new HashSet<Stringclass>(0);
@Id
@GeneratedValue
@Column(name="COLUMNDEF_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="NAME")
public String getName() {
return name;
}
public void setName(String val) {
name = val;
}
@OneToMany(cascade = CascadeType.ALL)
@JoinTable(name = "COLUMNDEF_STRINGCLASS", joinColumns = { @JoinColumn(name = "COLUMNDEF_ID") }, inverseJoinColumns = { @JoinColumn(name = "STRINGCLASS_ID") })
public Set<Stringclass> getValues() {
return values;
}
public void setValues(Set<Stringclass> lst) {
values = lst;
}
}