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();
正如你在這裏看到的,我想將SQL的flight_seat
列存儲到availableSeat
以檢查是否有可用的座位。如何從sqlDataReader存儲值?並比較?
我該怎麼做?因爲它一直在繼續。
謝謝你指導我。 – Toni
嗯,我覺得有一個問題。它說:「拋出System.invalidCaseException類型的異常:\ n指定的轉換無效」 – Toni
然後,您的'flight_seat'不是'int'值。您應該檢查MySQL數據庫中的底層類型。例如,如果它是'varchar'的某種類型,則需要將'availableSeat'定義爲'string'。 – Yuck