阅读我坚持这一段时间,我不知道如何解决这个问题。问题是我的SQL查询没有得到来自javaFX textfield和passwordfield的输入(我正在构建一个登录窗口)。 如果我手动输入值而不是从文本字段中获取它们,则程序可以正常工作,否则在按下登录按钮时不会发生任何事情。出现该问题在下面几行,当然没有错误消息:MySQL的预处理语句不从JavaFX的文本字段
preparedStatement.setString(1,txtUserName.getText());
preparedStatement.setString(2,txtPassword.getText());
下面是完整的代码:
public class LoginWindow implements Initializable{
@FXML
private TextField txtUserName;
@FXML
private PasswordField txtPassword;
@FXML
private Button btnLogin;
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
// Setting the login button.
@FXML
private void setBtnLogin(ActionEvent event) {
try {
connection = DBUtilities.getConnection();
String sqlQuery = "SELECT * FROM user_login_details WHERE User_Name = ? AND User_Password = ?";
preparedStatement = connection.prepareStatement(sqlQuery);
preparedStatement.setString(1,txtUserName.getText());
preparedStatement.setString(2,txtPassword.getText());
resultSet = preparedStatement.executeQuery();
if(resultSet.next()) {
DBUtilities.showInforMsg("Logged in:", "You have logged in!");
} else {
DBUtilities.showErrorMsg("Error:", "Invalid username or password");
}
}catch (Exception exception) {
exception.printStackTrace();
}finally {
DBUtilities.closePreparedStatement(preparedStatement);
DBUtilities.closeResultSet(resultSet);
DBUtilities.closeConnection(connection);
}
}
@Override
public void initialize(URL location, ResourceBundle resources) {
btnLogin.setOnAction(this::setBtnLogin);
}
}
通过输入数据手动而不是从一个文本字段retreiving它我的意思是: 了PreparedStatement.setString(1,“管理员”); preparedStatement.setString(2,“admin”); – cris22tian
你能用'txtUserName.getText()。修剪()'和'txtPassword.getText()。修剪()',如果它的工作原理试试? – developer
我试过了,它不起作用。感谢您的回应。任何其他想法可能会导致它? – cris22tian