如何計算每行的foreach double值以計算爲單值？

現在我背後有我的代碼這樣的邏輯：如何計算每行的foreach double值以計算爲單值？

INSERT INTO PAYMENT (amount, appointmentID) VALUES 
(@amount1, @app1), 
(@amount2, @app2), 
(@amount3, @app3), 
...

假設@ amount1是10，@ AMOUNT2是15，@ AMOUNT3是20

我怎麼計算amount1的總價值，AMOUNT2 ，金額3等，並以這種方式將其總數值45提交給數據庫：（@ amount1，@ app1）？我如何處理這種邏輯？

這是我有我的按鈕，單擊代碼：

string cMedication = string.Empty; 
string cQuantity = string.Empty; 
string cAppointment = string.Empty; 
foreach (DataGridViewRow row in this.dataPrescription.Rows) 
{ 
    cMedication = row.Cells[0].Value.ToString(); 
    cQuantity = row.Cells[1].Value.ToString(); 
    cAppointment = txtAppointmentID.Text; 

    if (cAppointment == "NO APPOINTMENT HAS BEEN MADE") 
    { 
     MessageBox.Show("Please make an appointment first at the Nurse counter", "WARNING"); 
    } 
    else 
    { 
     this.calculateTotal(cMedication, cQuantity, cAppointment); 
    } 
}

，這是我calculateTotal功能：

private void calculateTotal(string cMedication, string cQuantity, string cAppointment) 
{ 
    string strConnectionString = ConfigurationManager.ConnectionStrings["HConnection"].ConnectionString; 
    SqlConnection con = new SqlConnection(strConnectionString); 

    string insertPayment = "INSERT INTO PAYMENT (amount, appointmentID) " + 
     "VALUES (@insertAmount, @insertAppointment)"; 

    using (SqlConnection connection = new SqlConnection(strConnectionString)) 
    { 
     using (SqlCommand cmdPayment = new SqlCommand(insertPayment, connection)) 
     { 
      string strPrice = "SELECT medicationPrice FROM MEDICATION WHERE medicationName= @getName"; 
      SqlCommand cmdPrice = new SqlCommand(strPrice, con); 
      cmdPrice.Parameters.AddWithValue("@getName", cMedication); 

      con.Open(); 
      SqlDataReader readPrice = cmdPrice.ExecuteReader(); 
      if (readPrice.Read()) 
      { 
       string getPrice = readPrice["medicationPrice"].ToString(); 
       double doublePrice = Convert.ToDouble(getPrice); 
       double doubleQuantity = Convert.ToDouble(cQuantity); 

       double result = doublePrice * doubleQuantity; 

       string answer = result.ToString(); 
       cmdPayment.Parameters.AddWithValue("@insertAmount", answer); 
      } 

      readPrice.Close(); 
      con.Close(); 

      cmdPayment.Parameters.AddWithValue("@insertAppointment", txtAppointmentID.Text); 

      connection.Open(); 
      cmdPayment.ExecuteNonQuery(); 
      connection.Close(); 
     } 
    } 
}

來源

2014-02-08 user3195396

你想把所有的東西都歸在哪裏？我沒有看到任何代碼將總金額3的金額累加起來。你想讓它發生在數據庫或你的代碼？ I.E您是否需要將其呈現給用戶界面中的某個用戶，或者您是否足夠擁有數據庫？ –

那是因爲我不知道如何處理這個方法，所以這個問題。這只是一個簡單的插入數據庫 – user3195396

你需要避免過多的往返到數據庫。循環內的一對select-insert語句不被認爲是最佳實踐。

我會嘗試使用INSERT INTO SELECT聲明。例如：

INSERT INTO PAYMENT (amount, appointmentID) 
SELECT price * quantity, appointmentID FROM MEDICATION 
INNER JOIN APPOINTMENT 
ON "whatever_matches_medications_and_appointments"

來源

2014-02-08 14:41:14

你如何將這種技術應用到我的代碼？ – user3195396

如何計算每行的foreach double值以計算爲單值？

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