更新SQL語句不會觸發數據庫

我想知道我在代碼中丟失了什麼。我想要發生的一切是從，從CreditRequest表中獲取特定值，並將其放入UserData表中，creditrequest列。不知何故，我的代碼沒有執行任務。更新SQL語句不會觸發數據庫

這裏是我的代碼：

using (SqlConnection scn = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True")) 
{ 
    scn.Open(); 

    SqlCommand cmd = new SqlCommand(@"UPDATE UserData SET CreditRequest = 
    (SELECT CAST(REPLACE(c.CreditRequest, ',', '') as int) 
    FROM CreditRequests c Where [email protected]", scn); 

    cmd.Parameters.Add("@Username", SqlDbType.NVarChar).Value = Session["New"]; 

    cmd.ExecuteNonQuery(); 
}

來源

2016-06-01 Paolo Duhaylungsod

爲什麼你有兩個陳述。嘗試刪除下一個'SELECT'，然後使用'ExecuteNonQuery'來代替。 –

嘗試刪除第二條語句（忘記刪除它）並將其更改爲executenonquery。仍然不工作@FelixPamittan –

fyi，我在我的其他按鈕中有相同的代碼，並且工作得很好。不知道爲什麼這一個不工作 –

讓我們看看一行行的代碼。

using (SqlConnection scn = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True")) 
//I hope this is correct. Else "Server=PAOLO;Database=ShoppingCartDB;Integrated Security=True" 
{ 
    scn.Open(); 
/* 
    SqlCommand cmd = new SqlCommand(@"UPDATE UserData SET CreditRequest = 
    (SELECT CAST(REPLACE(c.CreditRequest, ',', '') as int) 
    FROM CreditRequests c Where [email protected]", scn); 
*/ 
    //SQL statement is all wrong and can update all rows 
    //Correct is 
    SqlCommand cmd = new SqlCommand(@"UPDATE UserData SET CreditRequest = " 
     + "CAST(REPLACE(c.CreditRequest, ',', '') as int) " 
     + " FROM CreditRequests c inner join UserData u " 
     + "on c.Username=u.Username Where [email protected]", scn); 
    cmd.Parameters.Add("@Username", SqlDbType.NVarChar).Value = (string)Session["New"]; //This is good 

    cmd.ExecuteNonQuery(); 
}

來源

2016-06-01 03:32:32

非常感謝！ :) –

更新SQL語句不會觸發數據庫

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