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我正在使用Eclipse和Glassfish 3.0。雖然以前我做過類似的事情，但對於這項技術來說還很陌生很簡單，真的有一個綁定到後臺bean的數據表。添加方法並刪除我已經介紹的方法 - 問題出在我調用的更新方法。我似乎無法看到在組件（HtmlInputText）中找到的更改，並不介意將數據傳回表中。更新在h：dataTable中更新後未反映在JPA實體中
我爲數據表的代碼如下（和JSF頁面）
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<f:loadBundle basename="resources.application" var="msg"/>
<head>
<title><h:outputText value="#{msg.welcomeTitle}" /></title>
</head>
<body>
<h:form id="mainform">
<h:dataTable var="row" border="0" value="#{beanCategory.collection}" binding="#{beanCategory.datatable}">
<f:facet name="header">
<h:outputText value="Categories"/>
</f:facet>
<h:column>
<f:facet name="header">
<h:outputText value="Description"/>
</f:facet>
<h:inputText id="input1" value="#{row.description}" valueChangeListener="#{row.inputChanged}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Id"/>
</f:facet>
<h:outputText id="id" value="#{row.id}"/>
</h:column>
<h:column>
<h:commandButton value="Delete" type="submit" action="#{beanCategory.remove}">
<f:setPropertyActionListener target="#{beanCategory.selectedcategory}" value="#{row}"/>
</h:commandButton>
<h:commandButton value="Save" action="#{beanCategory.update}"
>
<f:setPropertyActionListener
target="#{beanCategory.selectedcategory}" value="#{row}" />
</h:commandButton>
</h:column>
</h:dataTable>
<h:inputText id="text1"></h:inputText> <h:commandButton action="#{beanCategory.addCategory}" value="Add" type="submit" id="submitbutton">
</h:commandButton>
<br/><br/>
Messages
<h:messages></h:messages><br /><br />
</h:form>
</body>
</html>
輔助Bean在這裏
package net.bssuk.timesheets.controller;
import java.io.Serializable;
import java.util.List;
import javax.faces.component.UIInput;
import javax.faces.component.html.HtmlDataTable;
import javax.faces.context.FacesContext;
import javax.persistence.*;
import net.bssuk.timesheets.model.Category;
@javax.inject.Named("beanCategory")
@javax.enterprise.context.SessionScoped
public class BeanCategory implements Serializable {
private List<Category> collection;
private EntityManagerFactory emf;
private EntityManager em;
private int selectedid;
private Category selectedcategory;
private HtmlDataTable datatable;
private static final long serialVersionUID = 1L;
public BeanCategory() {
// TODO Auto-generated constructor stub
System.out.println("Bean Constructor");
}
public String addCategory() {
try {
this.emf = Persistence.createEntityManagerFactory("timesheets1");
System.out.println("Changed - Now attempting to add");
System.out.println("Ready to do cateogory");
Category category = new Category();
FacesContext context = FacesContext.getCurrentInstance();
UIInput input = (UIInput) context.getViewRoot().findComponent(
"mainform:text1");
String value = input.getValue().toString();
if (value != null) {
category.setDescription(input.getValue().toString());
} else {
category.setDescription("Was null");
}
this.em = this.emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(category);
tx.commit();
em.close();
emf.close();
// return "index.xhtml";
} catch (Exception e) {
e.printStackTrace();
}
return "return.html";
}
public String remove() {
try {
this.emf = Persistence.createEntityManagerFactory("timesheets1");
System.out.println("Getting Collection");
this.em = this.emf.createEntityManager();
FacesContext context = FacesContext.getCurrentInstance();
System.out.println("Number found is " + this.selectedid);
if (selectedcategory != null) {
System.out.println("removing "+selectedcategory.getId()+" - " +selectedcategory.getDescription());
EntityTransaction tx = em.getTransaction();
tx.begin();
System.out.println("Merging..");
this.em.merge(selectedcategory);
System.out.println("removing...");
this.em.remove(selectedcategory);
tx.commit();
em.close();
emf.close();
}else{
System.out.println("Not found");
}
return "index.xhtml";
} catch (Exception e) {
e.printStackTrace();
return "index.xhtml";
}
}
public String update() {
try {
this.emf = Persistence.createEntityManagerFactory("timesheets1");
System.out.println("Update Getting Collection");
Category category = (Category) getDatatable().getRowData();
FacesContext context = FacesContext.getCurrentInstance();
System.out.println("PHASE ID="+context.getCurrentPhaseId().toString());
if (category != null) {
// DESCRIPTION VALUE BELOW IS ALWAYS OLD VALUE (IE DATA IN DATABASE)
System.out.println("updating "+category.getId()+" - " +category.getDescription());
this.em = this.emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
em.merge(category);
tx.commit();
em.close();
emf.close();
}else{
System.out.println("Not found");
}
return "index.xhtml";
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
public void setCollection(List<Category> collection) {
this.collection = collection;
}
public List<Category> getCollection() {
// this.emf=Persistence.createEntityManagerFactory("timesheets1");
// System.out.println("Getting Collection");
try {
this.emf = Persistence.createEntityManagerFactory("timesheets1");
this.em = this.emf.createEntityManager();
Query query = this.em.createNamedQuery("findAll");
this.collection = query.getResultList();
return this.collection;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public void setSelectedid(int id) {
this.selectedid=id;
}
public void setSelectedcategory(Category selectedcategory) {
this.selectedcategory = selectedcategory;
}
public HtmlDataTable getDatatable() {
return datatable;
}
public void setDatatable(HtmlDataTable datatable) {
this.datatable = datatable;
}
public Category getSelectedcategory() {
return selectedcategory;
}
}
我映射爲JPA實體在
package net.bssuk.timesheets.model;
import java.io.Serializable;
import javax.persistence.*;
/**
* The persistent class for the CATEGORIES database table.
*
*/
@Entity
@Table(name="CATEGORIES")
@NamedQuery(name="findAll", query = "SELECT c from Category c")
public class Category implements Serializable {
private static final long serialVersionUID = 1L;
private String description;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
public Category() {
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public int getId() {
return this.id;
}
public void setId(int id) {
this.id = id;
}
}
確定 - 更新我的代碼以遵循示例。我試圖合併的EJB到場景如下
package net.bssuk.timesheets.ejb;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import net.bssuk.timesheets.model.Category;
@Stateless
public class CategoryEJB implements CategoryEJBRemote {
@PersistenceContext(unitName="timesheets1")
private EntityManager em;
@Override
public List<Category> findCategories() {
// TODO Auto-generated method stub
System.out.println("find categories");
Query query = em.createNamedQuery("findAll");
return query.getResultList();
}
@Override
public Category createCategory(Category category) {
// TODO Auto-generated method stub
em.persist(category);
return category;
}
@Override
public Category udpateCategory(Category category) {
// TODO Auto-generated method stub
return em.merge(category);
}
@Override
public void deleteCategory(Category category) {
// TODO Auto-generated method stub
em.remove(em.merge(category));
}
}
我EJB低於
package net.bssuk.timesheets.ejb;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import net.bssuk.timesheets.model.Category;
@Stateless
public class CategoryEJB implements CategoryEJBRemote {
@PersistenceContext(unitName="timesheets1")
private EntityManager em;
@Override
public List<Category> findCategories() {
// TODO Auto-generated method stub
System.out.println("find categories");
Query query = em.createNamedQuery("findAll");
return query.getResultList();
}
@Override
public Category createCategory(Category category) {
// TODO Auto-generated method stub
em.persist(category);
return category;
}
@Override
public Category udpateCategory(Category category) {
// TODO Auto-generated method stub
return em.merge(category);
}
@Override
public void deleteCategory(Category category) {
// TODO Auto-generated method stub
em.remove(em.merge(category));
}
}
任何人都可以提出，如果這看起來有點好嗎？或者我完全失去了它的陰謀！
其實只是強調，在更新方法 - 即使我的System.out.println（category.getDescription（））我得到表中的舊值 - 而不是ui值。即使當我試圖獲取component.getValue（）時，它也會返回舊值！ –
而不是從樹中獲取輸入組件，爲什麼不將它綁定到您的支持bean的屬性？ –
Arjan - 這是我問題所在的地方......我想我正在數據表中這樣做。但是，當我system.out.println getDescription值時，它始終具有舊值（而不是字段中已更改的值）。也許我沒有正確實施它...