如何在sql server中選擇輸出標量值？

Question

嗨，我仍然是TSQL的新手。 如何輸出標量變量以便我的vb代碼可以訪問它？

在VB中我使用rs方法。 在這種情況下，我將創建3 rs以便能夠訪問下面的數據。 我想有一個存儲過程可以給我4個值，我需要不使用多個rs。

Create PROCEDURE [dbo].[sp_tblTransaction_GET_All_Totals]

@TransID bigint

AS

Declare @MyTotalCharges as money 
Declare @MyTotalDiscounts as money 
Declare @MyTotalPayments as money 

Declare @TotalCharges as money
Declare @TotalDiscounts as money
Declare @TotalPayments as money
Declare @Balance as money

SELECT     @MyTotalCharges = SUM(Amount) 
FROM         tblTransactionDetails
WHERE     (TransID = @TransID)


SELECT     @MyTotalDiscounts = SUM(Amount) 
FROM         tblTransaction_DP
WHERE     (TransID = @TransID)

SELECT     @MyTotalPayments = SUM(Amount)
FROM         tblPayments
WHERE     (TransID = @TransID)

--Below are the scalar values I need to be ouputed and accessed by my vb app.
--How can I output the values below?

@TotalCharges = @MyTotalCharges
@TotalDiscounts = @MyTotalDiscounts
@TotalPayments = @MyTotalPayments
@Balance = (@MyTotalCharges - @MyTotalDiscounts - @MyTotalPayments)

Answer 1

你有沒有嘗試過？

SELECT @Balance AS 'Balance', @TotalCharges AS 'TotalCharges' ... 

Answer 2

您需要將存儲過程中的值作為表返回。 將此添加到您的過程中。

SELECT
    @TotalCharges as [Total Charges],
    @TotalDiscounts as [Total Discounts],
    @TotalPayments as [TotalPayments],
    @Balance as [Balance]

然后，您可以從VB應用程序執行存儲過程並將表加載到DataTable中。

int transactionID = 0;
DataTable table = new DataTable();

using (var connection = new SqlConnection("connectionString")
using (var command = new SqlCommand("sp_tblTransaction_GET_All_Totals", connection)
{
    connection.Open();
    command.CommandType = CommandType.StoredProcedure;
    command.Parameters.AddWithValue("@TransID", transactionID);

    using (var adapter = new SqlDataAdapter(command))
    {
        adapter.Fill(table);
    }   
}

使用SqlDataAdapter從C＃調用存儲過程

這是關於SqlDataAdapter的文檔，它將包括C＃和VB中的示例。

MSDN - SqlDataAdapter類（System.Data.SqlClient）