我如何从我的asp.net项目调用sql函数？

Question

这是我的功能：

create function fn_Inventory(@qty int, @item_ID int)  
returns int
as begin
    declare @result int

    set @result = (SELECT Quantity - @qty from Items where @item_ID = item_ID)
    return @result
end

我想从我的asp.net代码执行此函数;怎么做？

Answer 1

public int TotalCupom(int qty,int item_ID)
    { 
        int result;           
        SqlDataAdapter da2 = new SqlDataAdapter();
        if (conex1.State == ConnectionState.Closed)
        { conex1.Open();}
        SqlCommand Totalf = new SqlCommand("SELECT dbo.fn_Inventory(@qty,@item_ID)", qty,item_ID);
        SqlParameter _qty= new SqlParameter("@qty", SqlDbType.Int);
        SqlParameter _item_ID= new SqlParameter("@item_ID", SqlDbType.Int);
        _qty.Value = qty;
        _item_ID.Value = item_ID;
        result= Totalf.ExecuteScalar();


        return result;
    }