Nothing related to GWT, use JPA/Hibernate forum. You are create and drop
the database each time that EMF is created:
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
Use update instead create-drop.
2012/9/27 Manuel <[email protected]>
> Hi everyone,
>
> Actually I try to use GWT, Request Factory + JPA with Hibernate.
> It seems to be working, but there is no data in my local database.
>
> I can create a EntityMangerFactory
> private static final EntityManagerFactory emfInstance =
> Persistence.createEntityManagerFactory("kunde");[/code]
>
> a EntityManger
> EMF.createEntityManager()
>
> and persists a Object
> em.persist(Worker);
>
> I can also read all my persisted Objects.
>
> But I dont know where the data is saved. I thought, it should be saved in
> the postgresDB I configured in my persistence.xml?
>
>
> Any help is much appreciated.
> Thanks in advanced.
>
> Regards,
> Manuel
>
>
>
> Here is my Code, please let me know if you need any further information.
>
> My Entity Class
> package de.mash.project.server;
>
> import java.util.List;
>
> import javax.jdo.annotations.Transactional;
> import javax.persistence.Column;
> import javax.persistence.Entity;
> import javax.persistence.EntityManager;
> import javax.persistence.GeneratedValue;
> import javax.persistence.GenerationType;
> import javax.persistence.Id;
> import javax.persistence.Table;
> import javax.persistence.Transient;
>
> @Entity
> @Table(name = "Worker")
> public class Worker {
>
> public static Worker findWorker(Long id) {
> // if (id == 0) {
> return null;
> // }
> // EntityManager em = entityManager();
> // try {
> // Worker worker = em.find(Worker.class, id);
> // return worker;
> // } finally {
> // em.close();
> // }
> }
>
> @Transient
> protected Object[] jdoDetachedState;
>
> // @Id
> // @GeneratedValue(generator = "auto_increment")
> // @GenericGenerator(name = "auto_increment", strategy = "increment")
> // @Column(name = "id")
> // private int id;
>
> @Id
> @Column(name = "id")
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Long id;
>
> @Column(name = "first_name")
> private String firstName;
>
> @Column(name = "last_name")
> private String lastName;
>
> @Column(name = "salary")
> private int salary;
>
> public Worker() {
> }
>
> public Worker(String fname, String lname, int salary) {
> this.firstName = fname;
> this.lastName = lname;
> this.salary = salary;
> }
>
> public Long getId() {
> return id;
> }
>
> public void setId(long id) {
> this.id = id;
> }
>
> public String getFirstName() {
> return firstName;
> }
>
> public void setFirstName(String first_name) {
> this.firstName = first_name;
> }
>
> public String getLastName() {
> return lastName;
> }
>
> public void setLastName(String last_name) {
> this.lastName = last_name;
> }
>
> public int getSalary() {
> return salary;
> }
>
> public void setSalary(int salary) {
> this.salary = salary;
> }
>
> public static Long countWorkers() {
> return 2l;
> }
>
> public Integer getVersion() {
> return 1;
> }
>
> public void persist() {
> EntityManager em = entityManager();
> try {
> // em.getTransaction().begin();
> em.persist(this);
> // em.flush();
> // em.getTransaction().commit();
> } catch (Exception e) {
> int i = 1;
> } finally {
> em.close();
> }
>
> em = entityManager();
>
> final List<Worker> list = em.createQuery("select p from Worker
> p").getResultList();
>
> System.out.println(list.size());
> for (Worker current : list) {
> System.out.println(current.getFirstName() + " " +
> current.getLastName() + " " + current.getSalary());
> }
>
> em.close();
>
> }
>
> public static final EntityManager entityManager() {
> return EMF.get().createEntityManager();
> }
>
> }
>
>
> My persistence.xml
> <?xml version="1.0" encoding="UTF-8" ?>
> <persistence xmlns="http://java.sun.com/xml/ns/persistence";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";
> version="1.0">
>
> <persistence-unit name="kunde" transaction-type="RESOURCE_LOCAL">
> <class>de.mash.project.server.Worker</class>
>
> <properties>
> <property name="hibernate.dialect"
> value="org.hibernate.dialect.PostgreSQLDialect" />
> <property name="hibernate.show_sql" value="true" />
>
> <property name="hibernate.connection.driver_class"
> value="org.postgresql.Driver" />
> <property name="hibernate.connection.url"
> value="jdbc:postgresql://localhost:5432/dev_mash" />
> <property name="hibernate.connection.username"
> value="postgres" />
> <property name="hibernate.connection.password" value="m4nu3l"
> />
> <property name="hibernate.default_schema" value="public" />
>
> <property name="hibernate.hbm2ddl.auto" value="create" />
> <property name="hibernate.hbm2ddl.auto" value="create-drop" />
> </properties>
> </persistence-unit>
>
> </persistence>
>
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