无法在Java中加载数据库文件

Question

我正在使用sqlite数据库，并尝试检查输入字段中输入的用户名和密码是否与数据库匹配。但是我说

时出错

  

[SQLITE_NOTADB]打开的文件不是数据库文件（文件不是数据库）

我无法跟踪问题所在，因为我的编码非常清晰，如下所示，请帮忙！

与数据库的连接：

try {
    Class.forName("org.sqlite.JDBC");
    connection = DriverManager.getConnection("jdbc:sqlite:G:\\java\\GUI\\db.sql");
    JOptionPane.showMessageDialog(null, "Connection Successful !");
    return connection;
} catch (Exception e) {
    JOptionPane.showMessageDialog(null, e);
    return null;
}

代码：

try {

    String query = " select * from employee where UserName=? and Password=? ";
    PreparedStatement preparedStatement = connection.prepareStatement(query);
    preparedStatement.setString(1, userNameField.getText());
    preparedStatement.setString(2, passwordField.getText());

    ResultSet resultSet = preparedStatement.executeQuery();

    int count = 0;

    while (resultSet.next()) {
        count++;

    }

    if (count == 1) {
        JOptionPane.showMessageDialog(null, "UserName and Password is Correct");
    }
    else if (count > 1) {
        JOptionPane.showMessageDialog(null, "UserName or Password is duplicate");
    }
    else {
        JOptionPane.showMessageDialog(null, "UserName and Password is not Correct. Try Again Please ...");
    }

    preparedStatement.close();
    resultSet.close();

} catch (SQLException exception) {

    JOptionPane.showMessageDialog(null, exception);
     System.err.println(exception.getClass().getName() + ": " + exception.getMessage() );

}