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我在嘗試更新JComboBox
中的值,但問題是當我添加或刪除值時,JComboBox
中的所有名稱都會重複出現,我該如何解決這個問題?我試圖把它連接結束後但沒有奏效在JCOMBOBOX內部重複值
這裏是我的代碼:
private void cmbNamesPopupMenuWillBecomeInvisible(javax.swing.event.PopupMenuEvent evt) {
try{
String tmp=(String)cmbNames.getSelectedItem();
String sql="SELECT * FROM Account WHERE Fname=?";
pst=conn.prepareStatement(sql);
pst.setString(1,tmp);
rs=pst.executeQuery();
if(rs.next()){
String add1=rs.getString("ID");
txtID.setText(add1);
String add2=rs.getString("Fname");
txtFirst.setText(add2);
String add3=rs.getString("Lname");
txtLast.setText(add3);
String add4=rs.getString("Username");
txtUser.setText(add4);
String add5=rs.getString("Password");
txtPass.setText(add5);
cmdUpdate.setEnabled(true);
cmdDelete.setEnabled(true);
cmdAdd.setEnabled(false);
}
}
catch(SQLException e){
JOptionPane.showMessageDialog(null,e);
}
}
,這裏是我在名稱中使用的代碼():
private void Names(){
try{
String sql="Select fname from account";
pst=conn.prepareStatement(sql);
rs=pst.executeQuery();
while(rs.next()){
String name=rs.getString("fname");
cmbNames.addItem(name);
}
rs.close();
pst.close();
}
catch(SQLException e){
JOptionPane.showMessageDialog(null,e);
}
finally{
try{
rs.close();
pst.close();
}
catch(SQLException e){
JOptionPane.showMessageDialog(null,e);
}
}
}
忘記了要從內部JComboBoxes事件調用JDBC PopupMenuWillBecomeInvisible, – mKorbel