Problème de requète sous netbeans

Bonjour à tous, je reviens vers vous car je suis encore bloqué depuis une semaine, étant débutant mais vraiment débutant j'aimerai qu'on me donne un coup de main pour que mon appli lourde (qui est juste un test avant de commencer à développer la vraie appli puisse correspondre avec la base de données. Donc j'explique j'ai créé une interface graphique jframe avec 3 zones pour saisir des infos et 3 zone de texte pour recevoir du texte et 3 boutons envoyer recevoir et exit donc j'ai :
-une classe correspondant à mon interface graphique
-une classe correspondant à ma table (se trouvant sur un serveur 2003 et serveur sql 2005)

A priori la connexion est bien faite entre la base et mon appli, maintenant il faudrait que j'écrive les requêtes cependant je m'embrouille complètement avec la persistance, les entity managers, entity beans etc...

voici le code de mes 2 classes

classe pour l'interface graphique

Code:

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/*
 * MenuGraph.java
 *
 * Created on 21 juillet 2008, 14:57
 */
 
package monpaquet;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
 
/**
 *
 * @author  Amé
 */
public class MenuGraph extends javax.swing.JFrame {
 
    /** Creates new form MenuGraph */
    public MenuGraph() {
        initComponents();
    }
 
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        jProgressBar1 = new javax.swing.JProgressBar();
        BEnvoyer = new javax.swing.JButton();
        BRecevoir = new javax.swing.JButton();
        BExit = new javax.swing.JButton();
        VarEmail = new javax.swing.JTextField();
        VarNom = new javax.swing.JTextField();
        VarPrenom = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        Var2 = new javax.swing.JTextField();
        jLabel5 = new javax.swing.JLabel();
        Var1 = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        Var3 = new javax.swing.JTextField();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        BEnvoyer.setText("Envoyer");
        BEnvoyer.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BEnvoyerActionPerformed(evt);
            }
        });
 
        BRecevoir.setText("Recevoir");
        BRecevoir.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BRecevoirActionPerformed(evt);
            }
        });
 
        BExit.setText("Exit");
        BExit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                BExitActionPerformed(evt);
            }
        });
 
        jLabel1.setText("Email");
 
        jLabel2.setText("Nom");
 
        jLabel3.setText("Prénom");
 
        jLabel4.setText("NomRecu");
 
        jLabel5.setText("EmailReçu");
 
        jLabel6.setText("Prénomrecu");
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(150, 150, 150)
                        .addComponent(BEnvoyer)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(BRecevoir)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(BExit, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(17, 17, 17)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(VarNom, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(VarEmail, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel3)
                                .addGap(18, 18, 18)
                                .addComponent(VarPrenom, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                .addContainerGap(49, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(215, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel4)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(Var2, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(Var1, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel6)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(Var3, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(41, 41, 41))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(VarEmail, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(VarNom, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(VarPrenom, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3))
                .addGap(50, 50, 50)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Var1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel5))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Var2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel4))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Var3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel6))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 41, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(BEnvoyer)
                    .addComponent(BRecevoir)
                    .addComponent(BExit))
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>                        
 
private void BEnvoyerActionPerformed(java.awt.event.ActionEvent evt) {                                         
// Verification des saisies et affichage dans la zone Vérif
    String  chaine1, chaine2, chaine3, chaine4;
 
    chaine1 = VarNom.getText();
    chaine2 = VarPrenom.getText();
    chaine3 = VarEmail.getText();
 
 //   Var1.setText(chaine1);
 //   Var2.setText(chaine2); 
 //  Var3.setText(chaine3); 
 
 // test d'accès à la base
 
 Client mon_client = new Client();   
 
 
  try { 
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        String connectionUrl = "jdbc:sqlserver://192.168.1.100:1433;" +
            "databaseName=DALAU;user=sa;password=adminpw;";
       Connection con = DriverManager.getConnection(connectionUrl);
           /*mon_client.setNom(chaine1);
           mon_client.setPrenom(chaine2);
           mon_client.setEmail(chaine3); */   
 
 
 
 
        } catch (SQLException e) {
            System.out.println("SQL Exception: "+ e.toString());
        } catch (ClassNotFoundException cE) {
            System.out.println("Class Not Found Exception: "+ cE.toString());
        }
 // TODO add your handling code here:
}                                        
 
private void BExitActionPerformed(java.awt.event.ActionEvent evt) {                                      
System.exit(0);// TODO add your handling code here:
}                                     
 
private void BRecevoirActionPerformed(java.awt.event.ActionEvent evt) {                                          
// TODO add your handling code here:
}                                         
 
    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MenuGraph().setVisible(true);
            }
        });
    }
 
    // Variables declaration - do not modify                     
    private javax.swing.JButton BEnvoyer;
    private javax.swing.JButton BExit;
    private javax.swing.JButton BRecevoir;
    private javax.swing.JTextField Var1;
    private javax.swing.JTextField Var2;
    private javax.swing.JTextField Var3;
    private javax.swing.JTextField VarEmail;
    private javax.swing.JTextField VarNom;
    private javax.swing.JTextField VarPrenom;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JProgressBar jProgressBar1;
    // End of variables declaration                   
 
}

classe pour ma table client

Code:

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package monpaquet;
 
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
 
/**
 *
 * @author Amé
 */
@Entity
@Table(name = "Client")
@NamedQueries({@NamedQuery(name = "Client.findByNom", query = "SELECT c FROM Client c WHERE c.nom = :nom"), @NamedQuery(name = "Client.findByPrenom", query = "SELECT c FROM Client c WHERE c.prenom = :prenom"), @NamedQuery(name = "Client.findByAge", query = "SELECT c FROM Client c WHERE c.age = :age"), @NamedQuery(name = "Client.findByEmail", query = "SELECT c FROM Client c WHERE c.email = :email")})
public class Client implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Column(name = "Nom", nullable = false)
    private String nom;
    @Column(name = "Prenom")
    private String prenom;
    @Column(name = "Age")
    private Integer age;
    @Column(name = "Email")
    private String email;
 
    public Client() {
    }
 
    public Client(String nom) {
        this.nom = nom;
    }
 
    public String getNom() {
        return nom;
    }
 
    public void setNom(String nom) {
        this.nom = nom;
    }
 
    public String getPrenom() {
        return prenom;
    }
 
    public void setPrenom(String prenom) {
        this.prenom = prenom;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }
 
    @Override
    public int hashCode() {
        int hash = 0;
        hash += (nom != null ? nom.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 Client)) {
            return false;
        }
        Client other = (Client) object;
        if ((this.nom == null && other.nom != null) || (this.nom != null && !this.nom.equals(other.nom))) {
            return false;
        }
        return true;
    }
 
    @Override
    public String toString() {
        return "monpaquet.Client[nom=" + nom + "]";
    }
 
}

Voila si quelqu'un avait la bonté de me rajouter ce qu'il me manque ce serait super sympa ou alors me donner un exemple similaire à ce que je veux faire

Merci d'avance à ceux qui prendront le temps d'y jeter un coup d'oeil ;)