Question

我想用ID来检索数据库中的数据..所以，我想这样做：我的组合框1到4上有数字。每当我在组合框中选择1时，文本框的名字和姓氏文本将是根据所选的ID进行更改。我该怎么做？

我已经尝试过这样，但它不起作用：

private void Edit(Connection conn, Statement state, ResultSet result)
    {
        try
        {
            String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
            Class.forName(driver);

            String url = "jdbc:odbc:Database";

            conn = DriverManager.getConnection(url);

            String query = "select FirstName, LastName, Status, JoinedDate from Customer where ID = ?";

            PreparedStatement statement = conn.prepareStatement(query);

            statement.setInt(1, jComboBox1.getSelectedIndex());

            result = statement.executeQuery();

            while(result.next())
            {
                jTextField3.setText("FirstName");
                jTextField2.setText("LastName");
                jTextField3.setText("Status");
                JoinedDateLabel.setText("JoinedDate");
            }
        } 

        catch (Exception e) 
        {
            System.err.println(e.getMessage());

            _sound.PlaySound(2);

            _infoBox.ShowMessageBox(e.getMessage(), "Error", 2);

            _reminder = new Reminder(1);

            JOptionPane.showOptionDialog(null, "Program will be closed due to error!", "Error", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, new Object[]{}, null);

            System.exit(0);
        }

谢谢

Answer 1

试试这个

while(result.next())
{
    jTextField1.setText(result.getString("FirstName"));
    jTextField2.setText(result.getString("LastName"));
    jTextField3.setText(result.getString("Status"));
    JoinedDateLabel.setText(result.getString("JoinedDate"));
}

您正在使用当前代码执行的操作是将文本设置为strng文字“FirstName”。您需要实际从ResultSet检索数据并将文本设置为该数据。

另外，请注意JComboBox索引是基于0的。因此，如果您选择第一个索引，它将返回0.您应该确保（在您的情况下）数据库的Id为0,1,2,3

根据ID java检索数据

1 个答案: