检测是否在C＃中插入了MySQL行

Question

我有一个C＃程序，试图将数据插入MySQL数据库。数据可能已经在数据库中，在这种情况下，它只会覆盖数据。 示例：

MySqlConection dbConnection = ...; // Setup connection
int numCustomersToUpdate = 3;

String query =
    "INSERT INTO customer_regions (customer_id, region_id)
    VALUES (1, 205), (2, 314), (3, 151) // 3 customers
    ON DUPLICATE KEY UPDATE region_id = VALUES(region_id)";

MySqlCommand cmd = new MySqlCommand(query, dbConnection);

int rowsAffected = cmd.ExecuteNonQuery();
if (rowsAffected == numCustomersToUpdate)
{
    // Data either did not exist before and was inserted,
    // or already existed and overwritten
}
else
{
    // Error inserting data
}

问题在于，如果数据被覆盖，则rowsAffected为0，这被认为是错误。不管数据是被插入还是被覆盖，我如何认为它是成功的SQL执行？