java - java 注册表单

Question

大家好，我对java很陌生，我想要一个注册表单，我几乎得到它，但不知道我做错了什么。这是我的方法..

private void RegisterBtnActionPerformed(java.awt.event.ActionEvent evt) {
  try {
    final String host = "abc";
    final String user = "abc";
    final String pwd = "abc";

    connection = DriverManager.getConnection(host, user, pwd);

    statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
      ResultSet.CONCUR_UPDATABLE);
    String userName = txt_registerUsername.getText();
    String address = txt_registerAddress.getText();
    String phoneNo = txt_phoneNo.getText();
    String password = txt_registerPassword.getText();
    //final String select_query = "INSERT INTO Users ('username','address','phoneno','password') VALUES(?,?,?,?)";
    //rs = statement.executeQuery(select_query);
    //rs.next();
    PreparedStatement ps = connection.prepareStatement(
      "INSERT INTO Users VALUES(?,?,?,?)");

    ps.setString(1, userName);
    ps.setString(2, address);
    ps.setString(3, phoneNo);
    ps.setString(4, password);

    int i = ps.executeUpdate();
    if (i > 0)
      System.out.print("You are successfully registered...");
    else {
      JOptionPane.showMessageDialog(null, "Sorry Try again Later");
    }

  } catch (SQLException ex) {
    JOptionPane.showMessageDialog(null, "Sorry Something went wrong");
  }
}

这里的输出是catch SQLException。
谢谢。

Answer 1

您尚未选择数据库。 此外，您还可以在 SQLException catch block 中使用 e.printStackTrace() 。