Dear Rene,
Thks a lot for replying to me because I am feeling a little bit alone with
my CRUD ;-). In fact I am trying to build a dynamic MetaCrud.
My pb is simple: in the same jsp page I would like to update a Parent object
and its Childs (values):
<s:form action="saveOrUpdateParent">
<s:push value="parent">
<s:hidden name="id" /> <s:textfield
name="name" label="Nom" />
<s:push value="values">
<s:iterator id="p" value="values">
<s:textfield label="Nom" name="#name" value="%{name}"/>
</s:iterator>
</s:push>
<s:submit />
</s:push>
</s:form>
From an existing Parent object with many Childs objects I can easily modify
parent.name for instance but the collection of Child objects (values) is
always empty in the ParentAction (saveOrUpdate() method) after submitting.
However I can display each values[i].name in the jsp page with the correct
value.
So it is not an issue with Hibernate but with the jsp or ModelDriven
interface I don't know..Do you have any idea?
Basically I was not able to find a struts or spring documentation about CRUD
& association between two entities on the same jsp page.
best regards
bruno
--------------------------------------------------
From: "Rene Gielen" <gie...@it-neering.net>
Sent: Wednesday, March 31, 2010 7:12 PM
To: "Struts Users Mailing List" <user@struts.apache.org>
Subject: Re: CRUD with a OneToMany association under Struts 2 / Hibernate 3
I'm not sure if I understand what your actual question is, nor whether
it is particularly Struts 2 related (rather than just Hibernate) - but
you might want to have a look in the CRUD demo section of the Struts 2
showcase application. Maybe you will also find this demo useful:
http://github.com/rgielen/struts2crudevolutiondemo
- René
bruno grandjean schrieb:
Hi
I am trying to implement a simple CRUD with a OneToMany association under
Struts 2 / Hibernate 3.
I have two entities Parent and Child:
@Entity
@Table(name="PARENT")
public class Parent {
private Long id;
private Set<Child> values = new HashSet<Child>();
..
@Entity
@Table(name="CHILD")
public class Child {
private Long id;
private String name;
..
I can easily create, delete Parent or read the Child Set (values) but it
is impossible to update Child Set.
The jsp page (see below) reinit the values Set, no record after updating!
Could u explain to me what's wrong?
here are my code:
@Entity
@Table(name="PARENT")
public class Parent {
private Long id;
private Set<Child> values = new HashSet<Child>();
@Id
@GeneratedValue
@Column(name="PARENT_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name = "PARENT_CHILD", joinColumns = { @JoinColumn(name =
"PARENT_ID") }, inverseJoinColumns = { @JoinColumn(name = "CHILD_ID") })
public Set<Child> getValues() {
return values;
}
public void setValues(Set<Child> lst) {
values = lst;
}
}
@Entity
@Table(name="CHILD")
public class Child {
private Long id;
private String name;
@Id
@GeneratedValue
@Column(name="CHILD_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;
}
}
public interface ParentDAO {
public void saveOrUpdateParent(Parent cl);
public void saveParent(Parent cl);
public List<Parent> listParent();
public Parent listParentById(Long clId);
public void deleteParent(Long clId);
}
public class ParentDAOImpl implements ParentDAO {
@SessionTarget
Session session;
@TransactionTarget
Transaction transaction;
@Override
public void saveOrUpdateParent(Parent cl) {
try {
session.saveOrUpdate(cl);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
@Override
public void saveParent(Parent cl) {
try {
session.save(cl);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
@Override
public void deleteParent(Long clId) {
try {
Parent cl = (Parent) session.get(Parent.class, clId);
session.delete(cl);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
@SuppressWarnings("unchecked")
@Override
public List<Parent> listParent() {
List<Parent> courses = null;
try {
courses = session.createQuery("from Parent").list();
} catch (Exception e) {
e.printStackTrace();
}
return courses;
}
@Override
public Parent listParentById(Long clId) {
Parent cl = null;
try {
cl = (Parent) session.get(Parent.class, clId);
} catch (Exception e) {
e.printStackTrace();
}
return cl;
}
}
public class ParentAction extends ActionSupport implements
ModelDriven<Parent> {
private static final long serialVersionUID = -2662966220408285700L;
private Parent cl = new Parent();
private List<Parent> clList = new ArrayList<Parent>();
private ParentDAO clDAO = new ParentDAOImpl();
@Override
public Parent getModel() {
return cl;
}
public String saveOrUpdate()
{
clDAO.saveOrUpdateParent(cl);
return SUCCESS;
}
public String save()
{
clDAO.saveParent(cl);
return SUCCESS;
}
public String list()
{
clList = clDAO.listParent();
return SUCCESS;
}
public String delete()
{
HttpServletRequest request = (HttpServletRequest)
ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
clDAO.deleteParent(Long.parseLong(request.getParameter("id")));
return SUCCESS;
}
public String edit()
{
HttpServletRequest request = (HttpServletRequest)
ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
cl = clDAO.listParentById(Long.parseLong(request.getParameter("id")));
return SUCCESS;
}
public Parent getParent() {
return cl;
}
public void setParent(Parent cl) {
this.cl = cl;
}
public List<Parent> getParentList() {
return clList;
}
public void setParentList(List<Parent> clList) {
this.clList = clList;
}
}
and finally the jsp page:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
<%...@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Parent Registration Page</title>
<s:head />
<style type="text/css">
@import url(style.css);
</style>
</head>
<body>
<s:form action="saveOrUpdateParent">
<s:push value="parent">
<s:hidden name="id" />
<s:push value="values">
<s:iterator id="p" value="values">
<s:textfield label="Nom" name="values(%{id}).name" value="%{name}"/>
</s:iterator>
</s:push>
<s:submit />
</s:push>
</s:form>
<s:if test="parentList.size() > 0">
<div class="content">
<table class="userTable" cellpadding="5px">
<tr class="even">
<th>Child(s)</th>
</tr>
<s:iterator value="parentList" status="userStatus">
<tr
class="<s:if test="#userStatus.odd == true
">odd</s:if><s:else>even</s:else>">
<td><s:property value="values.size()" /></td>
<s:iterator value="values">
<td><s:property value="name" /></td>
</s:iterator>
<td><s:url id="editURL" action="editParent">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{editURL}">Edit</s:a></td>
<td><s:url id="deleteURL" action="deleteParent">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{deleteURL}">Delete</s:a></td>
</tr>
</s:iterator>
</table>
</div>
</s:if>
</body>
</html>
--
René Gielen
IT-Neering.net
Saarstrasse 100, 52062 Aachen, Germany
Tel: +49-(0)241-4010770
Fax: +49-(0)241-4010771
Cel: +49-(0)163-2844164
http://twitter.com/rgielen
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