JFrame java netbeans

**askim** · 21/02/2015, 18h32

Bonjour,
Je suis en train de faire l'affichage d'un tableau à partir d'une base de données (jtable in sql) et ça ne fonctionne pas.

Voilà le code :

Code java :

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package presentation;
import DAO.signalisation_freelancerDAO;
import technique.myconnexion;
import javax.swing.*;
import java.sql.*;
import DAO.FreelancerDAO;
import ENTITE.Freelancer;
import ENTITE.signalisation_freelancer;
import java.util.*;
import javax.swing.DefaultListModel;
import javax.swing.JOptionPane;
import net.proteanit.sql.DbUtils;
 
 
 
public class ListFreelancerSingalise1 extends javax.swing.JFrame {
 
Connection url=null;
ResultSet rs=null;
PreparedStatment pst=null;
 
 
    /**
     * Creates new form ListFreelancerSingalise1
     */
    public ListFreelancerSingalise1() {
        initComponents();
        url=myconnexion.getinstance();
        Update_table();
    }
    private void Update_table()
    {
        try{
        String sql="select * from signalisation_freelancer";
        pst=(PreparedStatment) url.prepareStatement(sql);
        rs=pst.executeQuery();
        jTable1.setModel(DbUtils.resultSetToTableModel(rs));
        }
 
        catch(Exception e ){
            JOptionPane.showMessageDialog(null,e);
        }
 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        jRadioButtonMenuItem1 = new javax.swing.JRadioButtonMenuItem();
        jLabel1 = new javax.swing.JLabel();
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
 
        jRadioButtonMenuItem1.setSelected(true);
        jRadioButtonMenuItem1.setText("jRadioButtonMenuItem1");
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jLabel1.setText("Liste des freelancer signalisé");
 
        jButton1.setText("Activer");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
 
        jButton2.setText("Supprimer");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
 
        jButton3.setText("recherche");
 
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(50, 50, 50)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, 89, Short.MAX_VALUE)
                    .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap(45, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jButton3)
                .addGap(18, 18, 18)
                .addComponent(jButton1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton2)
                .addGap(8, 8, 8))
        );
 
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(jTable1);
 
        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(157, 157, 157)
                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(51, 51, 51)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 452, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(193, 193, 193)
                        .addComponent(jLabel1)))
                .addContainerGap(90, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(20, 20, 20)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 18, Short.MAX_VALUE)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>                        
 
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        
 
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(ListFreelancerSingalise1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ListFreelancerSingalise1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ListFreelancerSingalise1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ListFreelancerSingalise1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ListFreelancerSingalise1().setVisible(true);
            }
        });
    }
 
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JRadioButtonMenuItem jRadioButtonMenuItem1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration                   
}

et voila la classe de connexion de la base de données :

Code java :

Sélectionner tout - Visualiser dans une fenêtre à part

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package technique;
 
/**
 *
 * @author ASUS
 */
import java.sql.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
 
/**
 *
 * @author ASUS
 */
public class myconnexion {
     String login="root";
     String pwd="";
    String url="jdbc:mysql://localhost:3306/freelance";
    public static  Connection myConnection;
 
public myconnexion() 
{
         try {
                          myConnection = DriverManager.getConnection(url , login, pwd);
 
 
             System.out.println("connexion ok ");
         } catch (SQLException ex) {
             Logger.getLogger(myconnexion.class.getName()).log(Level.SEVERE, null, ex);
         }
 
}
public static Connection getinstance()
{
    if(myConnection==null)
 
      {             
         new myconnexion();
 
      }
      return myConnection;
 
}
}

l interface :
Nom : Sans titre.png
Affichages : 603
Taille : 108,0 Ko

Merci d'avance pour votre aide.

**joel.drigo** · 21/02/2015, 18h55

Salut,

Il faut nous indiquer ce qu'il se passe ou ne se passe pas, parce que ça ne fonctionne pas c'est un peu vague : ça veut tout dire et rien dire à la fois.

Mais, à priori, je pense que le problème vient de :

Code :

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public static Connection getinstance()
{
    if(myConnection==null)
 
      {             
         new myconnexion();
 
      }
      return myConnection;
 
}

Tu n'affectes pas myConnection. Il faut faire :

Code :

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public static Connection getinstance()
{
    if(myConnection==null)
 
      {             
         myConnection = new myconnexion();
 
      }
      return myConnection;
 
}

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