Я хочу ввести данные из формы в базу данных, используя netbeans и java DB.Моя проблема в том, что я не могу понять, как передать данные, которые пользователь вводит в форму, в базу данных.
Я попытался создать класс сущности и подключить его через него, но на основании того, что яПосле этого я получаю доступ ко всей базе данных, а не только к форме
РЕДАКТИРОВАТЬ: Это школьный проект, и я не обучался JDBC, по крайней мере пока.
<?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:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core">
<h:head>
<title>Registration</title>
<h:outputStylesheet name="css/jsfcrud.css"/>
<h:outputStylesheet library="css" name="styles.css"/>
</h:head>
<h:body>
<h3>Registration Page</h3>
<h:form>
<h:panelGrid columns="3"
columnClasses="rightalign,leftalign,leftali
gn">
<h:outputLabel value="Category: " for="category"/>
<h:selectOneMenu id="category" label="Category"
value="#{registrationBean.
category}" >
<f:selectItem itemLabel="Simple." itemValue="Simple"/>
<f:selectItem itemLabel="Suite." itemValue="Suite"/>
<f:selectItem itemLabel="Luxurious" itemValue="Luxurious"/>
</h:selectOneMenu>
<h:message for="category"/>
<h:outputLabel value="People: " for="people"/>
<h:selectOneMenu id="people" label="People"
value="#{registrationBean.
people}" >
<f:selectItem itemLabel="Mr." itemValue="1"/>
<f:selectItem itemLabel="Mrs." itemValue="2"/>
<f:selectItem itemLabel="Miss" itemValue="3"/>
<f:selectItem itemLabel="Miss" itemValue="4"/>
</h:selectOneMenu>
<h:message for="people"/>
<h:outputLabel value="Duration:" for="duration"/>
<h:inputText id="duration" label="Duration"
required="true"
value="#{registrationBean.duration}" />
<h:message for="duration" />
<h:panelGroup/>
<h:commandButton id="register" value="Register"
action="confirmation" />
</h:panelGrid>
</h:form>
<br />
<h:link outcome="/room/List" value="Show All Room Items"/>
</h:body>
</html>
@Entity
public class Room implements Serializable {
@Id
@Basic(optional = false)
@NotNull
@Column(nullable = false)
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 20)
@Column(nullable = false, length = 20)
private String category;
@Basic(optional = false)
@NotNull
@Column(nullable = false)
private int people;
@Basic(optional = false)
@NotNull
@Column(nullable = false)
private int duration;
private static final long serialVersionUID = 1L;
@Id
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public Integer getPeople() {
return people;
}
public void setPeople(Integer people) {
this.people = people;
}
public Integer getDuration() {
return duration;
}
public void setDuration(Integer duration) {
this.duration = duration;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.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 Room)) {
return false;
}
Room other = (Room) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.ensode.jsf.hotelreservations.Room[ id=" + id + " ]";
}
public Room() {
}
public Room(Integer id) {
this.id = id;
}
public Room(Integer id, String category, int people, int duration) {
this.id = id;
this.category = category;
this.people = people;
this.duration = duration;
}
}
public class RoomJpaController implements Serializable {
public RoomJpaController(UserTransaction utx, EntityManagerFactory emf) {
this.utx = utx;
this.emf = emf;
}
private UserTransaction utx = null;
private EntityManagerFactory emf = null;
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(Room room) throws RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
em.persist(room);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(Room room) throws NonexistentEntityException, RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
room = em.merge(room);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Integer id = room.getId();
if (findRoom(id) == null) {
throw new NonexistentEntityException("The room with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void destroy(Long id) throws NonexistentEntityException, RollbackFailureException, Exception {
EntityManager em = null;
try {
utx.begin();
em = getEntityManager();
Room room;
try {
room = em.getReference(Room.class, id);
room.getId();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The room with id " + id + " no longer exists.", enfe);
}
em.remove(room);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public List<Room> findRoomEntities() {
return findRoomEntities(true, -1, -1);
}
public List<Room> findRoomEntities(int maxResults, int firstResult) {
return findRoomEntities(false, maxResults, firstResult);
}
private List<Room> findRoomEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Room.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public Room findRoom(Integer id) {
EntityManager em = getEntityManager();
try {
return em.find(Room.class, id);
} finally {
em.close();
}
}
public int getRoomCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Room> rt = cq.from(Room.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}
Это persistance.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="HotelReservationsPU" transaction-type="JTA">
<jta-data-source>java:app/roomintro</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
</properties>
</persistence-unit>
</persistence>
В результате получается форма, которая во время работы не добавляет никаких данных в базу данных.