Hibernate

/*
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 * and open the template in the editor.
 */

package demo.bean;

import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;

/**
 *
 * @author Maiquqel */
@Entity
@Table(name = "tecnico")
@NamedQueries({
    @NamedQuery(name = "Tecnico.findAll", query = "SELECT t FROM Tecnico t"),
    @NamedQuery(name = "Tecnico.findByIdTecnico", query = "SELECT t FROM Tecnico t WHERE t.idTecnico = :idTecnico"),
    @NamedQuery(name = "Tecnico.findByNome", query = "SELECT t FROM Tecnico t WHERE t.nome = :nome"),
    @NamedQuery(name = "Tecnico.findByEmail", query = "SELECT t FROM Tecnico t WHERE t.email = :email")})
public class Tecnico implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "idTecnico")
    private Integer idTecnico;
    @Basic(optional = false)
    @Column(name = "nome")
    private String nome;
    @Basic(optional = false)
    @Column(name = "email")
    private String email;

    public Tecnico() {
    }

    public Tecnico(Integer idTecnico) {
        this.idTecnico = idTecnico;
    }

    public Tecnico(Integer idTecnico, String nome, String email) {
        this.idTecnico = idTecnico;
        this.nome = nome;
        this.email = email;
    }

    public Integer getIdTecnico() {
        return idTecnico;
    }

    public void setIdTecnico(Integer idTecnico) {
        this.idTecnico = idTecnico;
    }

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (idTecnico != null ? idTecnico.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 Tecnico)) {
            return false;
        }
        Tecnico other = (Tecnico) object;
        if ((this.idTecnico == null && other.idTecnico != null) || (this.idTecnico != null && !this.idTecnico.equals(other.idTecnico))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "br.com.mnProgram.bean.Tecnico[idTecnico=" + idTecnico + "]";
    }

}

package demo.util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class SessionFactoryHelper {
    private static final SessionFactory sessionFactory;
    
    static {
        try {            
            /*
             * Build a SessionFactory object from session-factory configuration 
             * defined in the hibernate.cfg.xml file. In this file we register 
             * the JDBC connection information, connection pool, the hibernate 
             * dialect that we used and the mapping to our hbm.xml file for each 
             * POJO (Plain Old Java Object).
             * 
             */
        	   Configuration configuration = new AnnotationConfiguration();
               configuration.configure();
            sessionFactory = configuration.configure().buildSessionFactory();
        } catch (Throwable e) {
            System.err.println("Error in creating SessionFactory object." 
                + e.getMessage());
            throw new ExceptionInInitializerError(e);
        }
    }
    
    /*
     * A static method for other application to get SessionFactory object 
     * initialized in this helper class.
     * 
     */
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
    
    public static void main(String[] args) {
		System.out.println(SessionFactoryHelper.getSessionFactory());
	}
}

private static final SessionFactory sessionFactory; 

    private static SessionFactory buildSessionFactory() {
        try {
            Configuration configuration = new AnnotationConfiguration();
            return configuration ().buildSessionFactory();
        } catch (Throwable e) {  
            System.err.println("Error in creating SessionFactory object."   
                + e.getMessage());  
            throw new ExceptionInInitializerError(e);  
        }
    }

    public static Session getSession() {
        return sessionFactory.openSession();
    }