java - 如何将 mysql 中的数据插入组合框？

Question

我这里的代码有什么问题？

我正在尝试将数据从 mysql 插入到 netbean 的组合框中

private void btnSandoghMousePressed(java.awt.event.MouseEvent evt) {                                        
    try {
        String query = "SELECT `AccountType` FROM `account`"; 
        con = Connect.ConnectDB();
        PreparedStatement stm = con.prepareStatement(query); 
        pst = con.prepareStatement(query);                
        ResultSet rs = pst.executeQuery(query);
        ArrayList<String> groupNames = new ArrayList<String>(); 
        while (rs.next()) { 
            String groupName = rs.getString(4); 
            groupNames.add(groupName);
        } 
        DefaultComboBoxModel model = new DefaultComboBoxModel(groupNames.toArray());
        cmbSemetarID.setModel(model);
        rs.close();    
    } catch (SQLException e) {
    System.err.println("Connection Error! it's about date");
    }
}

Answer 1

有时您尝试以这种方式使用模型或使用 Vector 时会遇到问题。最好尝试做类似的事情，

  private void btnSandoghMousePressed(java.awt.event.MouseEvent evt){                                        
    try {
        String query = "SELECT `AccountType` FROM `account`"; 
        con = Connect.ConnectDB();
        PreparedStatement stm = con.prepareStatement(query); 
        pst = con.prepareStatement(query);                
        ResultSet rs = pst.executeQuery(query);
        DefaultComboBoxModel model = new DefaultComboBoxModel();
        while (rs.next()) { 
            String groupName = rs.getString(4); 
            model.add(groupName);
        } 

        cmbSemetarID.setModel(model);
        rs.close();    
    } catch (SQLException e) {
    System.err.println("Connection Error! it's about date");
    }
}