Enthuware

Code: Select all

@Entity
public class SimpleCustomer implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
    public SimpleCustomer(){
    }
                
    public Long getId() {
        return id;
    }

    public void setId(Long 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 SimpleCustomer)) {
            return false;
        }
        SimpleCustomer other = (SimpleCustomer) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }
    
    public void addSimpleCustOrder(SimpleCustOrder custOrder)
    {        
        custOrder.setCustomer(this);
    }

    @Override
    public String toString() {
        return "simplejpa.SimpleCustomer[ id=" + id + " ]";
    }

}

Code: Select all

@Entity
public class SimpleCustOrder implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    @ManyToOne
    private SimpleCustomer customer;

    public SimpleCustomer getCustomer() {
        return customer;
    }

    public void setCustomer(SimpleCustomer customer) {
        this.customer = customer;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long 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 SimpleCustOrder)) {
            return false;
        }
        SimpleCustOrder other = (SimpleCustOrder) 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 "simplejpa.SimpleCustOrder[ id=" + id + " ]";
    }

}

Code: Select all

public class SimpleJpa1 {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        EntityManagerFactory emf =  Persistence.createEntityManagerFactory("projpa2");
        EntityManager em  = emf.createEntityManager();
        
        EntityTransaction tx = em.getTransaction();
        
        tx.begin();                
        SimpleCustomer person = new SimpleCustomer();        
        person.setName("Customer1");
        SimpleCustomer person1 = new SimpleCustomer();        
        person1.setName("Customer2");
        
        SimpleCustOrder order1 =  new SimpleCustOrder();
        SimpleCustOrder order2 =  new SimpleCustOrder();
        SimpleCustOrder order3 =  new SimpleCustOrder();
        SimpleCustOrder order4 =  new SimpleCustOrder();
        SimpleCustOrder order5 =  new SimpleCustOrder();
        SimpleCustOrder order6 =  new SimpleCustOrder();
        person.addSimpleCustOrder(order1);
        person.addSimpleCustOrder(order2);
        person.addSimpleCustOrder(order3);
        
        person1.addSimpleCustOrder(order4);
        person1.addSimpleCustOrder(order5);        
        person1.addSimpleCustOrder(order6);        
        
        em.persist(person1);
        em.persist(person);
        em.persist(order1);                
        em.persist(order2);
        em.persist(order3);
        em.persist(order4);
        em.persist(order5);
        em.persist(order6);
        tx.commit();
        
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery cq1 = cb.createQuery();
        Root custRoot = cq1.from(SimpleCustomer.class);        
        Root orderRoot = cq1.from(SimpleCustOrder.class);        
        cq1.select(custRoot);
        TypedQuery tq1 = em.createQuery(cq1);
        List result1 = (List) tq1.getResultList();
        System.out.println("Result size " + result1.size());                       
    }    
}