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Commit 5dde869

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Added Activity 17A Application - Unit 15
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package unit15.jpa.Actividad17A_Aplicacion;
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import java.io.Serializable;
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import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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import javax.persistence.Id;
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@Entity
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public class Articulo implements Serializable {
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@Id
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@GeneratedValue
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private Integer id;
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private String titulo;
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private Integer año;
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private Integer numPalabras;
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public Articulo(String titulo, Integer año, Integer numPalabras) {
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this.titulo = titulo;
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this.año = año;
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this.numPalabras = numPalabras;
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}
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public Articulo() {
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}
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public Integer getId() {
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return id;
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}
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public void setId(Integer id) {
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this.id = id;
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}
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public String getTitulo() {
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return titulo;
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}
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public void setTitulo(String titulo) {
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this.titulo = titulo;
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}
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public Integer getAño() {
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return año;
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}
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public void setAño(Integer año) {
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this.año = año;
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}
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public Integer getNumPalabras() {
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return numPalabras;
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}
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public void setNumPalabras(Integer numPalabras) {
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this.numPalabras = numPalabras;
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}
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@Override
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public String toString() {
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return "Articulo{" + "id=" + id + ", titulo=" + titulo +
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", a\u00f1o=" + año + ", numPalabras=" + numPalabras + '}';
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}
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}
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package unit15.jpa.Actividad17A_Aplicacion;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.Persistence;
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import javax.persistence.Query;
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public class Main {
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public static void main(String[] args) {
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EntityManagerFactory emf;
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emf = Persistence.createEntityManagerFactory("PeriodistasPU");
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EntityManager em = emf.createEntityManager();
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String jpql = "SELECT p FROM Periodista p WHERE p.articulos IS EMPTY";
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Query query = em.createQuery(jpql);
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System.out.println("Periodistas sin artículos");
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List<Periodista> lista = query.getResultList();
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for (Periodista a : lista) {
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System.out.println(a);
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}
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jpql = "SELECT p FROM Periodista p WHERE SIZE(p.articulos) > 2";
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query = em.createQuery(jpql);
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System.out.println("Periodista que tienen más de 2 artículos");
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lista = query.getResultList();
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for (Periodista p : lista) {
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System.out.println(p);
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}
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}
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}
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package unit15.jpa.Actividad17A_Aplicacion;
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import java.io.Serializable;
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import java.util.LinkedList;
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import java.util.List;
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import javax.persistence.CascadeType;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.OneToMany;
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@Entity
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public class Periodista implements Serializable {
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private String nombre;
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@Id
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private String dni; //clave
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private String numTel;
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@OneToMany(cascade = CascadeType.ALL)
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private List<Articulo> articulos;
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public Periodista(String nombre, String dni, String numTel) {
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this.nombre = nombre;
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this.dni = dni;
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this.numTel = numTel;
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this.articulos = new LinkedList<>();
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}
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public Periodista() {
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}
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public void addArticulo(Articulo a) {
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articulos.add(a);
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}
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public String getNombre() {
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return nombre;
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}
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public void setNombre(String nombre) {
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this.nombre = nombre;
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}
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public String getDni() {
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return dni;
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}
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public void setDni(String dni) {
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this.dni = dni;
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}
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public String getNumTel() {
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return numTel;
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}
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public void setNumTel(String numTel) {
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this.numTel = numTel;
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}
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@Override
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public String toString() {
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return "Periodista{" + "nombre=" + nombre + ", dni=" + dni + ", numTel=" + numTel + '}';
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}
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public List<Articulo> getArticulos() {
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return articulos;
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}
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public void setArticulos(List<Articulo> articulos) {
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this.articulos = articulos;
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<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">
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<persistence-unit name="PeriodistasPU" transaction-type="RESOURCE_LOCAL">
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<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
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<class>codigo.Periodista</class>
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<class>codigo.Articulo</class>
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<properties>
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<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/Persistencia?zeroDateTimeBehavior=convertToNull"/>
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<property name="javax.persistence.jdbc.user" value="usuario"/>
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<property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
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<property name="javax.persistence.jdbc.password" value="usuario12345"/>
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<property name="javax.persistence.schema-generation.database.action" value="create"/>
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</properties>
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</persistence-unit>
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</persistence>

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