c# - 如何存储 sqlDataReader 的值？并进行比较？

Question

int availableSeat = 0;
string query = "select flight_no flight_seat from flight_info where flight_departure_time = @selectedFlight AND flight_from = @flightFrom AND flight_to = @flightTo ";
string url = "Server=localhost;Database=flight;uid=******;password=*****";
con1 = new MySqlConnection(url);
con1.Open();
cmd1 = new MySqlCommand(query,con1);
cmd1.Parameters.AddWithValue("@selectedFlight",comboBox3.SelectedItem);
cmd1.Parameters.AddWithValue("@flightFrom",comboBox1.SelectedItem);
cmd1.Parameters.AddWithValue("@flightTo",comboBox2.SelectedItem);
reader = cmd1.ExecuteReader();
while (reader.Read()) 
{
    availableSeat.Equals(reader["flight_seat"]);
    if(availableSeat > 0)
    {
        MessageBox.Show("The seat is available!!");
    }
    else
    {
        MessageBox.Show("Sorry, all seat has been booked!!");
    }
}
con1.Close();

正如您在这里所看到的，我想将 SQL 中的 flight_seat 列存储到 availableSeat 中，以检查是否有可用座位。

我怎样才能做到这一点？因为它不断地去往其他地方。

Answer 1

availableSeat.Equals() 是比较而不是赋值。您需要分配该值。例如

availableSeat = (int)reader["flight_seat"];