データをコンボボックスにsql-javaのデータで追加する

Question

Sqlを使用してJavaでプログラムを作成し始めました。 私がSQLのテーブルに持っているデータでコンボボックスを塗りつぶそうとすると、それはうまく動作せず、理由がわかりません。

public class Proveedores extends javax.swing.JFrame 
{ 

    Connection cnn; 

    ConexionesBaseDeDatos conexiones = new ConexionesBaseDeDatos(); 


    public Proveedores() { 
     initComponents(); 
    } 

    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
    private void initComponents() { 

     jLabel1 = new javax.swing.JLabel(); 
     jLabel2 = new javax.swing.JLabel(); 
     jLabel3 = new javax.swing.JLabel(); 
     jLabel4 = new javax.swing.JLabel(); 
     jLabel5 = new javax.swing.JLabel(); 
     txtNombreProveedor = new javax.swing.JTextField(); 
     txtDireccionProveedor = new javax.swing.JTextField(); 
     txtMailProveedor = new javax.swing.JTextField(); 
     cmbProvinciasProveedores = new javax.swing.JComboBox(); 
     btnCrearProveedor = new javax.swing.JButton(); 
     btnModificarProveedor = new javax.swing.JButton(); 
     btnDesabilitarProveedor = new javax.swing.JButton(); 
     txtTelefonoProveedor = new javax.swing.JFormattedTextField(); 
     jScrollPane1 = new javax.swing.JScrollPane(); 
     listProveedores = new javax.swing.JList(); 
     btnAceptar = new javax.swing.JButton(); 
     btnGuardarCambios = new javax.swing.JButton(); 
     btnDesabilitar = new javax.swing.JButton(); 
     btnCancelar = new javax.swing.JButton(); 
     jMenuBar1 = new javax.swing.JMenuBar(); 
     jMenu1 = new javax.swing.JMenu(); 
     jMenuItem1 = new javax.swing.JMenuItem(); 
     jMenuItem2 = new javax.swing.JMenuItem(); 
     jMenuItem3 = new javax.swing.JMenuItem(); 
     jMenuItem4 = new javax.swing.JMenuItem(); 
     jMenuItem5 = new javax.swing.JMenuItem(); 
     jMenuItem6 = new javax.swing.JMenuItem(); 
     jMenuItem7 = new javax.swing.JMenuItem(); 
     jMenuItem10 = new javax.swing.JMenuItem(); 
     jMenuItem11 = new javax.swing.JMenuItem(); 
     jMenu3 = new javax.swing.JMenu(); 
     jMenuItem9 = new javax.swing.JMenuItem(); 
     jMenu4 = new javax.swing.JMenu(); 
     jMenuItem8 = new javax.swing.JMenuItem(); 
     jMenu2 = new javax.swing.JMenu(); 
     jMenuItem12 = new javax.swing.JMenuItem(); 
     jMenu5 = new javax.swing.JMenu(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     addWindowListener(new java.awt.event.WindowAdapter() { 
      public void windowActivated(java.awt.event.WindowEvent evt) { 
       formWindowActivated(evt); 
      } 
     }); 

     jLabel1.setText("Nombre"); 

     jLabel2.setText("Teléfono"); 

     jLabel3.setText("Dirección"); 

     jLabel4.setText("Mail"); 

     jLabel5.setText("Provincia"); 

     btnCrearProveedor.setText("Crear Proveedor"); 

     btnModificarProveedor.setText("Modificar Proveedor"); 

     btnDesabilitarProveedor.setText("Deshabilitar Proveedor"); 

     txtTelefonoProveedor.setCursor(new java.awt.Cursor(java.awt.Cursor.TEXT_CURSOR)); 

     listProveedores.setEnabled(false); 
     listProveedores.setVisibleRowCount(13); 
     jScrollPane1.setViewportView(listProveedores); 

     btnAceptar.setText("Aceptar"); 

     btnGuardarCambios.setText("Guardar Cambios"); 
     btnGuardarCambios.setEnabled(false); 

     btnDesabilitar.setText("Desabilitar"); 
     btnDesabilitar.setEnabled(false); 

     btnCancelar.setText("Cancelar"); 

     jMenu1.setText("File"); 

     jMenuItem1.setText("Proveedores"); 
     jMenu1.add(jMenuItem1); 

     jMenuItem2.setText("Clientes"); 
     jMenu1.add(jMenuItem2); 

     jMenuItem3.setText("Modelos"); 
     jMenu1.add(jMenuItem3); 

     jMenuItem4.setText("Eventos"); 
     jMenu1.add(jMenuItem4); 

     jMenuItem5.setText("Subastas"); 
     jMenu1.add(jMenuItem5); 

     jMenuItem6.setText("Compras"); 
     jMenu1.add(jMenuItem6); 

     jMenuItem7.setText("Ventas"); 
     jMenu1.add(jMenuItem7); 

     jMenuItem10.setText("Colecciones"); 
     jMenu1.add(jMenuItem10); 

     jMenuItem11.setText("Lineas"); 
     jMenu1.add(jMenuItem11); 

     jMenu3.setText("Productos"); 

     jMenuItem9.setText("Tipos de productos"); 
     jMenu3.add(jMenuItem9); 

     jMenu1.add(jMenu3); 

     jMenu4.setText("Insumos"); 

     jMenuItem8.setText("Tipos de insumos"); 
     jMenu4.add(jMenuItem8); 

     jMenu1.add(jMenu4); 

     jMenuBar1.add(jMenu1); 

     jMenu2.setText("Ayuda"); 

     jMenuItem12.setText("Acerca de..."); 
     jMenu2.add(jMenuItem12); 

     jMenuBar1.add(jMenu2); 

     jMenu5.setText("Salir"); 
     jMenuBar1.add(jMenu5); 

     setJMenuBar(jMenuBar1); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(40, 40, 40) 
       .addComponent(btnCrearProveedor) 
       .addGap(97, 97, 97) 
       .addComponent(btnModificarProveedor) 
       .addGap(104, 104, 104) 
       .addComponent(btnDesabilitarProveedor) 
       .addContainerGap(64, Short.MAX_VALUE)) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(67, 67, 67) 
       .addComponent(btnAceptar) 
       .addGap(52, 52, 52) 
       .addComponent(btnCancelar) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 92, Short.MAX_VALUE) 
       .addComponent(btnGuardarCambios) 
       .addGap(62, 62, 62) 
       .addComponent(btnDesabilitar) 
       .addGap(71, 71, 71)) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(22, 22, 22) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addComponent(jLabel5) 
         .addGap(18, 18, 18) 
         .addComponent(cmbProvinciasProveedores, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false) 
         .addGroup(layout.createSequentialGroup() 
          .addComponent(jLabel2) 
          .addGap(18, 18, 18) 
          .addComponent(txtTelefonoProveedor)) 
         .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup() 
          .addComponent(jLabel4) 
          .addGap(42, 42, 42) 
          .addComponent(txtMailProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE))) 
        .addGroup(layout.createSequentialGroup() 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addComponent(jLabel3) 
          .addComponent(jLabel1)) 
         .addGap(18, 18, 18) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
          .addComponent(txtNombreProveedor) 
          .addComponent(txtDireccionProveedor, javax.swing.GroupLayout.DEFAULT_SIZE, 117, Short.MAX_VALUE)))) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 137, Short.MAX_VALUE) 
       .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 312, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addGap(36, 36, 36)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(20, 20, 20) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addComponent(btnCrearProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(btnModificarProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(1, 1, 1) 
         .addComponent(btnDesabilitarProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE))) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(50, 50, 50) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
          .addComponent(jLabel1) 
          .addComponent(txtNombreProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addGroup(layout.createSequentialGroup() 
           .addGap(27, 27, 27) 
           .addComponent(jLabel3)) 
          .addGroup(layout.createSequentialGroup() 
           .addGap(22, 22, 22) 
           .addComponent(txtDireccionProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))) 
         .addGap(20, 20, 20) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addGroup(layout.createSequentialGroup() 
           .addGap(3, 3, 3) 
           .addComponent(jLabel5)) 
          .addComponent(cmbProvinciasProveedores, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
         .addGap(18, 18, 18) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
          .addComponent(jLabel2) 
          .addComponent(txtTelefonoProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
         .addGap(21, 21, 21) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addGroup(layout.createSequentialGroup() 
           .addGap(3, 3, 3) 
           .addComponent(jLabel4)) 
          .addComponent(txtMailProveedor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
         .addGap(35, 35, 35)) 
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
         .addGap(36, 36, 36) 
         .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 223, Short.MAX_VALUE) 
         .addGap(27, 27, 27))) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(btnDesabilitar) 
        .addComponent(btnAceptar) 
        .addComponent(btnCancelar) 
        .addComponent(btnGuardarCambios)) 
       .addGap(64, 64, 64)) 
     ); 

     pack(); 
    }// </editor-fold> 

    private void formWindowActivated(java.awt.event.WindowEvent evt) { 
     deshabilitarCampos(); 

     if (conexiones.conectaralabase()) 
      cargarComboProvincias(); 

    } 

    public static void main() 
    { 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new Proveedores().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify 
    private javax.swing.JButton btnAceptar; 
    private javax.swing.JButton btnCancelar; 
    private javax.swing.JButton btnCrearProveedor; 
    private javax.swing.JButton btnDesabilitar; 
    private javax.swing.JButton btnDesabilitarProveedor; 
    private javax.swing.JButton btnGuardarCambios; 
    private javax.swing.JButton btnModificarProveedor; 
    private javax.swing.JComboBox cmbProvinciasProveedores; 
    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.JMenu jMenu1; 
    private javax.swing.JMenu jMenu2; 
    private javax.swing.JMenu jMenu3; 
    private javax.swing.JMenu jMenu4; 
    private javax.swing.JMenu jMenu5; 
    private javax.swing.JMenuBar jMenuBar1; 
    private javax.swing.JMenuItem jMenuItem1; 
    private javax.swing.JMenuItem jMenuItem10; 
    private javax.swing.JMenuItem jMenuItem11; 
    private javax.swing.JMenuItem jMenuItem12; 
    private javax.swing.JMenuItem jMenuItem2; 
    private javax.swing.JMenuItem jMenuItem3; 
    private javax.swing.JMenuItem jMenuItem4; 
    private javax.swing.JMenuItem jMenuItem5; 
    private javax.swing.JMenuItem jMenuItem6; 
    private javax.swing.JMenuItem jMenuItem7; 
    private javax.swing.JMenuItem jMenuItem8; 
    private javax.swing.JMenuItem jMenuItem9; 
    private javax.swing.JScrollPane jScrollPane1; 
    private javax.swing.JList listProveedores; 
    private javax.swing.JTextField txtDireccionProveedor; 
    private javax.swing.JTextField txtMailProveedor; 
    private javax.swing.JTextField txtNombreProveedor; 
    private javax.swing.JFormattedTextField txtTelefonoProveedor; 
    // End of variables declaration 


    private void deshabilitarCampos() 
    { 
     txtNombreProveedor.setEnabled(false); 
     txtDireccionProveedor.setEnabled(false); 
     txtMailProveedor.setEnabled(false); 
     btnAceptar.setEnabled(false); 
     btnCancelar.setEnabled(false); 
     btnDesabilitar.setEnabled(false); 
     btnGuardarCambios.setEnabled(false); 
     cmbProvinciasProveedores.setEnabled(false); 
     listProveedores.setEnabled(false); 
    } 

    private void habilitarCamposBtnCrearProveedor() 
    { 
     btnAceptar.setEnabled(true); 
     btnCancelar.setEnabled(true); 
     cmbProvinciasProveedores.setEnabled(true); 
     listProveedores.setEnabled(true); 
     txtDireccionProveedor.setEnabled(true); 
     txtMailProveedor.setEnabled(true); 
     txtNombreProveedor.setEnabled(true); 
    } 

    private void habilitarCamposBtnModificarProveedor() 
    { 
     btnAceptar.setEnabled(false); 
     btnCancelar.setEnabled(true); 
     cmbProvinciasProveedores.setEnabled(true); 
     listProveedores.setEnabled(true); 
     txtDireccionProveedor.setEnabled(true); 
     txtMailProveedor.setEnabled(true); 
     txtNombreProveedor.setEnabled(true); 
     btnGuardarCambios.setEnabled(true); 
     btnDesabilitarProveedor.setEnabled(false); 
     btnDesabilitar.setEnabled(false); 
     btnCrearProveedor.setEnabled(false); 
    } 

    private void limpiarCampos() 
    { 
     cmbProvinciasProveedores.setSelectedIndex(-1); 
     txtDireccionProveedor.setText(""); 
     txtMailProveedor.setText(""); 
     txtNombreProveedor.setText(""); 
    } 


    public void habilitarbtnCrearProveedor() 
    { 
     btnAceptar.setEnabled(true); 
     btnCancelar.setEnabled(true); 
     cmbProvinciasProveedores.setEnabled(true); 
     txtDireccionProveedor.setEnabled(true); 
     txtMailProveedor.setEnabled(true); 
     txtNombreProveedor.setEnabled(true); 
     txtTelefonoProveedor.setEnabled(true); 
    } 


    private void cargarComboProvincias() 
    { 
     Statement sql; 
     ResultSet datos; 
     boolean seguir; 
     Provincias provinciaActual; 

     try 
     { 
      sql = cnn.createStatement(); 
      datos = sql.executeQuery("SELECT * FROM provincias WHERE id_provincia IS NOT NULL"); 
      seguir = datos.next(); 

      while (seguir) 
      { 
       provinciaActual = new Provincias(); 
       provinciaActual.setNombre_provincia(datos.getString("nombre_provincia")); 

       provinciaActual.toString(); 
       cmbProvinciasProveedores.addItem(provinciaActual); 
       seguir = datos.next(); 
      } 
     } 
     catch (Exception e) 
     { 
      JOptionPane.showMessageDialog(null,e.getMessage() + "error en cargarComboProvincias"); 
      e.printStackTrace(); 
     } 
    } 
} 


and here is where i make the connection with the database: 


import java.sql.Connection; 

import java.sql.DriverManager; 

import java.sql.ResultSet; 

import java.sql.Statement; 

import javax.swing.JOptionPane; 


public class ConexionesBaseDeDatos 
{ 
    Connection cnn; 

    public boolean conectaralabase() 
    { 
     String connString; 

     try 
     { 
      Class.forName ("com.microsoft.sqlserver.jdbc.SQLServerDriver"); 
      connString = ("jdbc:sqlserver://GILLOPEZ:1433;database=DOLLS;Trusted_Connection=True"); 
      cnn = DriverManager.getConnection (connString,"sa","1q2w3e4r"); 
     } 
     catch(Exception e) 
     { 
      System.out.println(e.getMessage() + "Error en conectaralabase()"); 
      return false; 
     } 
     return true; 
    } 
} 

すべてのヘルプは高く評価されています。ここでは

は、私がこれまで試してみましたものです。ありがとう。

Answer 1

は3選択を書く）

1ループResulsetの内側には、Vector 1Dベクトル

Vector<String> v1 = new Vector<String>(); 
v1.add("item1"); 
v1.add("item2"); 
v1.add("item3"); 
JComboBox combo = new JComboBox(v1); 

3）プットにデータを置くString[]アレイ

`String[] items = {"test1", "test2", "test3"}; 
JComboBox combo = new JComboBox(items);` 

2）にデータを入れて、あなたが持っていますデータをComboBoxModel

DefaultComboBoxModel model = new DefaultComboBoxModel(); 
model.add("item1"); 
model.add("item2"); 
model.add("item3"); 
JComboBox combo = new JComboBox(); 
combo.setModel(model); 

以外のものが

• JComboBox Tutorial

• JDBC Basic

• トン例here