Question

我已将combobox链接到MySQL数据库，以便按姓名和姓氏显示员工列表。问题是，当我点击一名员工时，我想在另一个Textfield中显示他的注册号码。我尝试使用此代码，但遗憾的是它不起作用：

public void popcombo(){

    try {
        String sql ="Select registration,surname,name  from employee";
        ps=conn.prepareStatement(sql);
        rs=ps.executeQuery();
        while(rs.next()){
            String surname = rs.getString("surname");
            String registration = rs.getString("registration");
            String name =rs.getString("name");
            StringBuilder st = new StringBuilder();
            st.append(surname).append("  ").append(name); 

            AutoCompleteDecorator.decorate(empcombo);


            empcombo.addItem(st);

        }
    } catch(Exception ty)
    {
        JOptionPane.showMessageDialog(null,ty);
    }
}


private void empcomboItemStateChanged(java.awt.event.ItemEvent evt) {                                          
    String  p= empcombo.getSelectedItem().toString();
    try{

        String sql ="Select surname,name,registration from employee where registration='"+p+"'";


        rs=ps.executeQuery();
        while(rs.next()){

            jTextField1.setText(rs.getString("registration"));
        }  
    }catch(Exception tz)
    {
        JOptionPane.showMessageDialog(null,tz);
    }  
}

Answer 1

empcomboItemStateChanged()，未在第二种方法中调用ps=conn.prepareStatement(sql);而where registration='"+p+"'";错误。在第一种方法中，不需要列registration

    comboBox.addItemListener(new ItemListener() {
    public void itemStateChanged(ItemEvent event) {
        if (event.getStateChange() == ItemEvent.SELECTED) {
        {//Now we will get only selected item
            String selectedValue = comboBox.getSelectedValue().toString();
            String values[]=selectedValue.split("\\s+");
            String sql ="Select registration from employee where surname='"+values[0]+"' and name='"+values[1]+"'";
            //since st.append(surname).append("  ").append(name);, double space between surname and name
            ps=conn.prepareStatement(sql); 
            rs=ps.executeQuery();              
            if(rs.next()){
                jTextField1.setText(rs.getString("registration"));
            } 
        }
    }
    });

Answer 2

我使用了这段代码：

   private void empcomboItemStateChanged(java.awt.event.ItemEvent evt) {                                          
 try{
    {
        String selectedItem = empcombo.getSelectedItem().toString();
        String sql ="Select registration from employee where surname='"+selectedItem.split(" ")[0]+"' and name='"+selectedItem.split(" ")[1]+"'";

        ps=conn.prepareStatement(sql); 
        rs=ps.executeQuery();              
        if(rs.next()){
            jTextField1.setText(rs.getString("registration"));

        } 
    }
}catch(Exception gh){
    JOptionPane.showMessageDialog(null, gh);
}
}

Answer 3

最后我得到了答案，特别感谢Satya帮助我。这是最终的代码：

  private void empcomboItemStateChanged(java.awt.event.ItemEvent evt) {                                          


    try{
     String selectedItem = empcombo.getSelectedItem().toString();   
    String[] items = selectedItem.split(" ");
    if(items.length >= 2){


        String sql ="Select matricule from employés where nom='"+items[0]+"' and prénom='"+items[1]+"'";

        ps=conn.prepareStatement(sql); 
        rs=ps.executeQuery();              
        if(rs.next()){
            jTextField1.setText(rs.getString("matricule"));

        } }

}catch(Exception gh){
    JOptionPane.showMessageDialog(null, gh);
}
}

Combobox链接到MySQL和Jtextfield

3 个答案: