Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 560
  • Last Modified:

Get value from datatable

Hi,

I have the following code for retrieving records from my shopping cart table. How can I add up all SUM(P.Price) values and store the result in subtotal variable? Also, right now if a user adds the same CD more than once my statement shows price for unit and total unit price * how many times user added the same CD. Is there a way to show one more column Quantity in that GridView1 that would show the quantity? I am using Access database.

Thank you.
Dim strSQL1 As String = "SELECT P.Title, P.Artist, P.Price, SUM(P.Price) AS SubTotal FROM Products P, Cart C WHERE C.SessionID='" & _
                                    Session.SessionID & "' AND P.ProductID=C.ProductFK1 GROUP BY P.Title, P.Artist, P.Price"
        Dim subtotal, tax, total As Double
        Dim objCommand1 As New System.Data.OleDb.OleDbCommand(strSQL1, objConnection)
 
            Try
                objConnection.Open()
                Dim rdr As System.Data.OleDb.OleDbDataReader = objCommand1.ExecuteReader
                Dim dt As System.Data.DataTable = New System.Data.DataTable
                dt.Load(rdr)
 
                objConnection.Close()
 
                GridView1.DataSource = dt
                GridView1.DataBind()
 
                dt.Dispose()
            Catch ex As Exception
                MsgBox("Connection failed to open. Error: " & ex.ToString())
            End Try

Open in new window

0
Yury Merezhkov
Asked:
Yury Merezhkov
  • 5
  • 4
1 Solution
 
Jim P.Commented:
Should just be a count of ProductID. Try this:
Dim strSQL1 As String = "SELECT P.Title, P.Artist, P.Price, SUM(P.Price) AS SubTotal, Count(P.ProductID) As Qty FROM Products P, Cart C WHERE C.SessionID='" & _
                                    Session.SessionID & "' AND P.ProductID=C.ProductFK1 GROUP BY P.Title, P.Artist, P.Price"
        Dim subtotal, tax, total As Double
        Dim objCommand1 As New System.Data.OleDb.OleDbCommand(strSQL1, objConnection)
 
            Try
                objConnection.Open()
                Dim rdr As System.Data.OleDb.OleDbDataReader = objCommand1.ExecuteReader
                Dim dt As System.Data.DataTable = New System.Data.DataTable
                dt.Load(rdr)
 
                objConnection.Close()
 
                GridView1.DataSource = dt
                GridView1.DataBind()
 
                dt.Dispose()
            Catch ex As Exception
                MsgBox("Connection failed to open. Error: " & ex.ToString())
            End Try

Open in new window

0
 
Yury MerezhkovDevelopment Team LeadAuthor Commented:
Yep, that worked. Thank you. Do you happen to know how to answer my first question?
0
 
Jim P.Commented:
Do you mean: Show Records Added Last Month
http://www.experts-exchange.com/Q_24379474.html?
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
Yury MerezhkovDevelopment Team LeadAuthor Commented:
No :) In this one, how can I add up all SUM(P.Price) values and store the result in subtotal variable?
0
 
Jim P.Commented:
I'm not really an ASP guy but the way I would think would work without running through the whole recordset and adding -- a query on a query for the whole cart, and to get the subtotal right the first
Dim strSQL1 As String = "SELECT P.Title, P.Artist, P.Price, CDbl(Count(P.ProductID)) * (P.Price) AS SubTotal, Count(P.ProductID) As Qty FROM Products P, Cart C WHERE C.SessionID='" & _
                                    Session.SessionID & "' AND P.ProductID=C.ProductFK1 GROUP BY P.Title, P.Artist, P.Price"
 
 
Dim strSQL1 As String = "SELECT SUM(SubTotal) As OrderSubtotal, Sum(Qty) As OrderQTY FROM " _
             "(SELECT  CDbl(Count(P.ProductID)) * (P.Price) AS SubTotal, Count(P.ProductID) As Qty FROM Products P, Cart C WHERE C.SessionID='" & _
                                    Session.SessionID & "' AND P.ProductID=C.ProductFK1 GROUP BY ProductID)"

Open in new window

0
 
Yury MerezhkovDevelopment Team LeadAuthor Commented:
I tried your second statement and it gives me an error: You tried to execute a query that does not include the specified expression 'CDbl(Count(P.ProductID)) * (P.Price)' as a part of an aggregate function. Could you please see if you can fix it because I really like sql approach more than recordsets.
0
 
Jim P.Commented:
Try this:
Dim strSQL1 As String = "SELECT SUM(SubTotal) As OrderSubtotal, Sum(Qty) As OrderQTY FROM " _
             "(SELECT  CDbl(Count(P.ProductID)) * Sum(P.Price) AS SubTotal, Count(P.ProductID) As Qty FROM Products P, Cart C WHERE C.SessionID='" & _
                                    Session.SessionID & "' AND P.ProductID=C.ProductFK1 GROUP BY ProductID)"

Open in new window

0
 
Yury MerezhkovDevelopment Team LeadAuthor Commented:
That worked, thanks!
0
 
Jim P.Commented:
Glad to be of assistance. May all your days get brighter and brighter.
0

Featured Post

Fill in the form and get your FREE NFR key NOW!

Veeam is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

  • 5
  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now