根据所提供的查询，是否有任何指标可以知道OleDbDataAdapter是否有记录？

using System;
using System.Data;
using System.Data.OleDb;

public class Program
{
    public static void Main()
    {
        string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\data\\database.accdb;";
        string query = "SELECT * FROM Customers WHERE Country = 'USA';";

        using (OleDbConnection connection = new OleDbConnection(connectionString))
        {
            OleDbDataAdapter adapter = new OleDbDataAdapter(query, connection);
            DataSet dataSet = new DataSet();

            adapter.Fill(dataSet);

            if (dataSet.Tables.Count > 0 && dataSet.Tables[0].Rows.Count > 0)
            {
                Console.WriteLine("OleDbDataAdapter has records.");
            }
            else
            {
                Console.WriteLine("OleDbDataAdapter has no records.");
            }
        }
    }
}