Para ello se especificaran 2 clases:
- src.main.java,org,ximodante.entities.Party
- src.main.java,org,ximodante.persistence.testEntityManager
package src.main.java.org.ximodante.entities;
import java.io.Serializable;
import javax.persistence.*;
/**
* Entity implementation class for Entity: party
*
*/
@Entity
@Table(name = "elecparty", schema="myschema")
public class Party implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(name = "initial")
private String initial;
@Column(name = "name")
private String name;
public Party() {
super();
}
// Autogenerated getters and setters
public Party(String initial, String name) {
super();
this.initial = initial;
this.name = name;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getInitial() {
return initial;
}
public void setInitial(String initial) {
this.initial = initial;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
}
Ahora vamos a crear la calse manejadora de persistencia
package src.main.java,org.ximodante.persistence;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import src.main.java.org.ximodante.entities.Party;
public class testEntityManager {
/**
* @param args
*/
EntityManagerFactory emf = null;
EntityManager em = null;
public static void main(String[] args) {
// TODO Auto-generated method stub
EntityManagerFactory emf = Persistence.createEntityManagerFactory("postgres");
EntityManager em = emf.createEntityManager();
persistSomeData(em);
em.close();
emf.close();
}
private static void persistSomeData (EntityManager em ) {
em.getTransaction().begin();
em.persist (new Party("PSPV-PSOE","Partit Socialista del Pais Valencià"));
em.persist (new Party("PP" ,"Partit Popular"));
em.persist (new Party("EUPV" ,"Esquerra Unida del Pais Valencià"));
em.persist (new Party("UPyD" ,"Unión Progreso y Democracia"));
em.persist (new Party("Bloc" ,"Compromis Bloc"));
em.persist (new Party("ERC" ,"Esquerra Republicana de Catalunya"));
em.getTransaction().commit();
}
}
Si ejecutamos podemos comprobar que:
- Si la BBDD o el esquema no están creado en Postgres, entonce da error. Por tanto las BBDD y los esquemas si se utilizan, se deben crear previamente.
- Se creará la tabla elecparty dentro del esquema myschema.
