Использовал простую базу данных InnoDB MySQL (отношения между многими между WRITER и FORUM и таблицу соединений с именем writer_forum) в Netbeans 7.1 и создал веб-приложение Java EE 6, работающее под управлением Glassfish 3.1 Open Source Edition. Другие платформы не используются, кроме JSF 2.0
- Сгенерированные сущности из базы данных (с использованием EclipseLink (JPA 2.0), и все выглядит нормально, насколько я могу судить, код в сущностях верен.
- Сгенерированные страницы JSF из сущностей (IDE генерирует EJB-сеансные компоненты, управляемые компоненты и страницы JSF с использованием facelets .xhtml).
Поддерживаются все отношения, кроме MANY TO MANY.
Кто-нибудь имел такой же опыт и сумел включить поддержку отношений «Многие ко многим»?
package entities;
@Entity
@Table(name = "writer")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Writer.findAll", query = "SELECT w FROM Writer w"),
@NamedQuery(name = "Writer.findByWriterid", query = "SELECT w FROM Writer w WHERE w.writerid = :writerid"),
@NamedQuery(name = "Writer.findByName", query = "SELECT w FROM Writer w WHERE w.name = :name"),
@NamedQuery(name = "Writer.findBySurname", query = "SELECT w FROM Writer w WHERE w.surname = :surname"),
@NamedQuery(name = "Writer.findByField", query = "SELECT w FROM Writer w WHERE w.field = :field")})
public class Writer implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "writerid")
private Integer writerid;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 45)
@Column(name = "name")
private String name;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 45)
@Column(name = "surname")
private String surname;
@Size(max = 45)
@Column(name = "field")
private String field;
@ManyToMany(mappedBy = "writerCollection")
private Collection<Forum> forumCollection;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "writer")
private Collection<Book> bookCollection;
public Writer() {
}
public Writer(Integer writerid) {
this.writerid = writerid;
}
public Writer(Integer writerid, String name, String surname) {
this.writerid = writerid;
this.name = name;
this.surname = surname;
}
public Integer getWriterid() {
return writerid;
}
public void setWriterid(Integer writerid) {
this.writerid = writerid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public String getField() {
return field;
}
public void setField(String field) {
this.field = field;
}
@XmlTransient
public Collection<Forum> getForumCollection() {
return forumCollection;
}
public void setForumCollection(Collection<Forum> forumCollection) {
this.forumCollection = forumCollection;
}
@XmlTransient
public Collection<Book> getBookCollection() {
return bookCollection;
}
public void setBookCollection(Collection<Book> bookCollection) {
this.bookCollection = bookCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (writerid != null ? writerid.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Writer)) {
return false;
}
Writer other = (Writer) object;
if ((this.writerid == null && other.writerid != null) || (this.writerid != null && !this.writerid.equals(other.writerid))) {
return false;
}
return true;
}
@Override
public String toString() {
return name + " | " + writerid;
}
}
-------- ФОРУМ JPA-сущность
@Entity
@Table(name = "forum")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Forum.findAll", query = "SELECT f FROM Forum f"),
@NamedQuery(name = "Forum.findByForumid", query = "SELECT f FROM Forum f WHERE f.forumid = :forumid"),
@NamedQuery(name = "Forum.findByLabel", query = "SELECT f FROM Forum f WHERE f.label = :label")})
public class Forum implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@NotNull
@Column(name = "forumid")
private Integer forumid;
@Size(max = 45)
@Column(name = "label")
private String label;
@JoinTable(name = "forum_writer", joinColumns = {
@JoinColumn(name = "forum_forumid", referencedColumnName = "forumid")}, inverseJoinColumns = {
@JoinColumn(name = "writer_writerid", referencedColumnName = "writerid")})
@ManyToMany
private Collection<Writer> writerCollection;
public Forum() {
}
public Forum(Integer forumid) {
this.forumid = forumid;
}
public Integer getForumid() {
return forumid;
}
public void setForumid(Integer forumid) {
this.forumid = forumid;
}
public String getLabel() {
return label;
}
public void setLabel(String label) {
this.label = label;
}
@XmlTransient
public Collection<Writer> getWriterCollection() {
return writerCollection;
}
public void setWriterCollection(Collection<Writer> writerCollection) {
this.writerCollection = writerCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (forumid != null ? forumid.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Forum)) {
return false;
}
Forum other = (Forum) object;
if ((this.forumid == null && other.forumid != null) || (this.forumid != null && !this.forumid.equals(other.forumid))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entities.Forum[ forumid=" + forumid + " ]";
}
}
Фасад Асбракт
public abstract class AbstractFacade<T> {
private Class<T> entityClass;
public AbstractFacade(Class<T> entityClass) {
this.entityClass = entityClass;
}
protected abstract EntityManager getEntityManager();
public void create(T entity) {
getEntityManager().persist(entity);
}
public void edit(T entity) {
getEntityManager().merge(entity);
}
public void remove(T entity) {
getEntityManager().remove(getEntityManager().merge(entity));
}
public T find(Object id) {
return getEntityManager().find(entityClass, id);
}
public List<T> findAll() {
javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
cq.select(cq.from(entityClass));
return getEntityManager().createQuery(cq).getResultList();
}
public List<T> findRange(int[] range) {
javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
cq.select(cq.from(entityClass));
javax.persistence.Query q = getEntityManager().createQuery(cq);
q.setMaxResults(range[1] - range[0]);
q.setFirstResult(range[0]);
return q.getResultList();
}
public int count() {
javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
cq.select(getEntityManager().getCriteriaBuilder().count(rt));
javax.persistence.Query q = getEntityManager().createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
}
}
Фасад форума
@Stateless
public class ForumFacade extends AbstractFacade<Forum> {
@PersistenceContext(unitName = "writerPU")
private EntityManager em;
@Override
protected EntityManager getEntityManager() {
return em;
}
public ForumFacade() {
super(Forum.class);
}
}
------------- Управляемый компонент
@ManagedBean(name = "writerController")
@SessionScoped
public class WriterController implements Serializable {
private Writer current;
private DataModel items = null;
@EJB
private session.WriterFacade ejbFacade;
private PaginationHelper pagination;
private int selectedItemIndex;
public WriterController() {
}
public Writer getSelected() {
if (current == null) {
current = new Writer();
selectedItemIndex = -1;
}
return current;
}
private WriterFacade getFacade() {
return ejbFacade;
}
public PaginationHelper getPagination() {
if (pagination == null) {
pagination = new PaginationHelper(10) {
@Override
public int getItemsCount() {
return getFacade().count();
}
@Override
public DataModel createPageDataModel() {
return new ListDataModel(getFacade().findRange(new int[]{getPageFirstItem(), getPageFirstItem() + getPageSize()}));
}
};
}
return pagination;
}
public String prepareList() {
recreateModel();
return "List";
}
public String prepareView() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
return "View";
}
public String prepareCreate() {
current = new Writer();
selectedItemIndex = -1;
return "Create";
}
public String create() {
try {
getFacade().create(current);
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterCreated"));
return prepareCreate();
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
return null;
}
}
public String prepareEdit() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
return "Edit";
}
public String update() {
try {
getFacade().edit(current);
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterUpdated"));
return "View";
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
return null;
}
}
public String destroy() {
current = (Writer) getItems().getRowData();
selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
performDestroy();
recreatePagination();
recreateModel();
return "List";
}
public String destroyAndView() {
performDestroy();
recreateModel();
updateCurrentItem();
if (selectedItemIndex >= 0) {
return "View";
} else {
// all items were removed - go back to list
recreateModel();
return "List";
}
}
private void performDestroy() {
try {
getFacade().remove(current);
JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("WriterDeleted"));
} catch (Exception e) {
JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));
}
}
private void updateCurrentItem() {
int count = getFacade().count();
if (selectedItemIndex >= count) {
// selected index cannot be bigger than number of items:
selectedItemIndex = count - 1;
// go to previous page if last page disappeared:
if (pagination.getPageFirstItem() >= count) {
pagination.previousPage();
}
}
if (selectedItemIndex >= 0) {
current = getFacade().findRange(new int[]{selectedItemIndex, selectedItemIndex + 1}).get(0);
}
}
public DataModel getItems() {
if (items == null) {
items = getPagination().createPageDataModel();
}
return items;
}
private void recreateModel() {
items = null;
}
private void recreatePagination() {
pagination = null;
}
public String next() {
getPagination().nextPage();
recreateModel();
return "List";
}
public String previous() {
getPagination().previousPage();
recreateModel();
return "List";
}
public SelectItem[] getItemsAvailableSelectMany() {
return JsfUtil.getSelectItems(ejbFacade.findAll(), false);
}
public SelectItem[] getItemsAvailableSelectOne() {
return JsfUtil.getSelectItems(ejbFacade.findAll(), true);
}
@FacesConverter(forClass = Writer.class)
public static class WriterControllerConverter implements Converter {
public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
if (value == null || value.length() == 0) {
return null;
}
WriterController controller = (WriterController) facesContext.getApplication().getELResolver().
getValue(facesContext.getELContext(), null, "writerController");
return controller.ejbFacade.find(getKey(value));
}
java.lang.Integer getKey(String value) {
java.lang.Integer key;
key = Integer.valueOf(value);
return key;
}
String getStringKey(java.lang.Integer value) {
StringBuffer sb = new StringBuffer();
sb.append(value);
return sb.toString();
}
public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
if (object == null) {
return null;
}
if (object instanceof Writer) {
Writer o = (Writer) object;
return getStringKey(o.getWriterid());
} else {
throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName() + "; expected type: " + WriterController.class.getName());
}
}
}
}
---------- XTMLCreate PAGE для WRITER ----
**
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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">
<ui:composition template="/template.xhtml">
<ui:define name="title">
<h:outputText value="#{bundle.CreateWriterTitle}"></h:outputText>
</ui:define>
<ui:define name="body">
<h:panelGroup id="messagePanel" layout="block">
<h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
</h:panelGroup>
<h:form>
<h:panelGrid columns="2">
<h:outputLabel value="#{bundle.CreateWriterLabel_writerid}" for="writerid" />
<h:inputText id="writerid" value="#{writerController.selected.writerid}" title="#{bundle.CreateWriterTitle_writerid}" required="true" requiredMessage="#{bundle.CreateWriterRequiredMessage_writerid}"/>
<h:outputLabel value="#{bundle.CreateWriterLabel_name}" for="name" />
<h:inputText id="name" value="#{writerController.selected.name}" title="#{bundle.CreateWriterTitle_name}" required="true" requiredMessage="#{bundle.CreateWriterRequiredMessage_name}"/>
<h:outputLabel value="#{bundle.CreateWriterLabel_surname}" for="surname" />
<h:inputText id="surname" value="#{writerController.selected.surname}" title="#{bundle.CreateWriterTitle_surname}" required="true" requiredMessage="#{bundle.CreateWriterRequiredMessage_surname}"/>
<h:outputLabel value="#{bundle.CreateWriterLabel_field}" for="field" />
<h:inputText id="field" value="#{writerController.selected.field}" title="#{bundle.CreateWriterTitle_field}" />
</h:panelGrid>
<br />
<h:commandLink action="#{writerController.create}" value="#{bundle.CreateWriterSaveLink}" />
<br />
<br />
<h:commandLink action="#{writerController.prepareList}" value="#{bundle.CreateWriterShowAllLink}" immediate="true"/>
<br />
<br />
<h:commandLink value="#{bundle.CreateWriterIndexLink}" action="/index" immediate="true" />
</h:form>
</ui:define>
</ui:composition>
</html>
**