How to use alias column value in a for each loop

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SQL-server-2000

Hi can any one help me to give me a suggestion how to get alias column value from i'm trying to use a for each loop in vb.net using a datatable.

My code is actually shown below

VB

If CInt(RowItem.Item("TOTALLINENO"))  500 Then
       For c As Integer = 0 To tblRawTesterShutdown.Columns.Count - 1
If CInt(tblRawTesterShutdown.Rows(c)(10)("Percentage")); Max Then
       Max = CInt(tblRawTesterShutdown.Rows(c)(10)("Percentage"))
              End If
        Next
  Max = Max - Convert.ToInt32(tblRawTesterShutdown.Rows(tblRawTesterShutdown.Rows.Count - 1))
                  Else
                   Return False
   End If 'End here

I have do it in vs 2005. The percentage is a sql server query. the query is shown below

VB

SELECT  t1.LINE_NO, t1.E_FIELD, t1.F_FIELD, t1.G_FIELD, t1.FAMILY, t1.HSA_STATUS,t1.CACHE_FAMILY, 
    SUM(t1.TOTAL) AS CountOfLineNo, t2.TotalOfLineNo, 
    convert(decimal(18,3),(convert(decimal(8,1),SUM(t1.TOTAL)) * 100 / t2.TotalOfLineNo )/100)AS Percentage
    FROM(
          SELECT LINE_NO, E_FIELD,F_FIELD,G_FIELD,HSA_STATUS,FAMILY,CACHE_FAMILY, Count(LINE_NO) as Total
          FROM TX_HSA_SUMM WITH(NOLOCK)
          WHERE MT_TIMESTAMP2 BETWEEN ('2013-04-03 14:28:00.000') AND ('2013-04-03 14:28:00.000')
          AND  E_FIELD!='00000' AND F_FIELD!='00000' AND G_FIELD!='00000' -- added new line
          GROUP BY LINE_NO,E_FIELD,F_FIELD,G_FIELD,HSA_STATUS,FAMILY,CACHE_FAMILY
        ) AS t1 
    LEFT JOIN (
          SELECT LINE_NO, COUNT(LINE_NO) AS TotalOfLineNo
          FROM TX_HSA_SUMM WITH(NOLOCK)
          WHERE MT_TIMESTAMP2 BETWEEN ('2013-04-03 14:28:00.000') AND ('2013-04-03 14:28:00.000')
          GROUP BY LINE_NO 
          ) AS t2 
    ON t1.LINE_NO = t2.LINE_NO    
	GROUP BY t1.LINE_NO, t1.E_FIELD, t1.F_FIELD, t1.G_FIELD, t1.HSA_STATUS, t1.FAMILY, t1.CACHE_FAMILY, t1.Total,t2.TotalOfLineNo
	HAVING t2.TotalOfLineNo > '500' and t1.line_no='64072m' and hsa_status='r'
	ORDER BY   t1.E_FIELD, t1.F_FIELD, t1.G_FIELD, t2.TotalOfLineNo,t1.Total,t1.HSA_STATUS, t1.LINE_NO, t1.FAMILY, t1.CACHE_FAMILY

The bold Percentage value from sql server should be used in the vb.net for each loop actually. I'm using vs 2005 ans sql server 2000. Thanks in advance

Posted 2-Apr-13 21:48pm

kumar2413

Updated 2-Apr-13 22:07pm

Kenneth Haugland

v3

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Maciej Los · Answer 1 · 2013-04-06T13:09:00

If i good remember, you want to read values stored in a DataTable object to sort records and do some other operations, because MS SQL server functionality is less than MS SQL Server 2005 and does not contains functions like ROW_NUMBER...

You want to go through the collection of records (stored in single column) to get a maximum, then to do some operations.
You need to "convert" datatable object into List(of T)[^], which contains functionality you're looking for.

VB

Module Module1

    Sub Main()
        Dim dt As DataTable = Nothing, dr As DataRow = Nothing, dc As DataColumn = Nothing
        Dim dl As List(Of Integer) = Nothing, i As Integer = 0

        Try
            dt = CreateDataTable()
            dc = dt.Columns("MyInt")
            dl = New List(Of Integer)
            For Each dr In dt.Rows
                dl.Add(dr.Item(dc))
            Next

            Console.WriteLine("=== Unsorted list ===")
            For i = 0 To dl.Count - 1
                Console.WriteLine("Item: {0}, value: {1}", i, dl.Item(i))
            Next

            Console.WriteLine("")
            Console.WriteLine("Sorting...")
            dl.Sort()
            Console.WriteLine("")
            Console.WriteLine("=== Sorted list ===")
            For i = 0 To dl.Count - 1
                Console.WriteLine("Item: {0}, value: {1}", i, dl.Item(i))
            Next

            Console.ReadKey()

        Catch ex As Exception

        End Try


    End Sub

    Function CreateDataTable() As Data.DataTable
        Dim dt As Data.DataTable = Nothing
        Dim dr As Data.DataRow = Nothing
        Dim dc As Data.DataColumn = Nothing
        Dim i As Integer = 0, rnd As Random = Nothing
        Try
            rnd = New Random
            dt = New Data.DataTable("Test")
            dc = New DataColumn("MyInt", GetType(Integer))
            dt.Columns.Add(dc)
            For i = 1 To 20
                dr = dt.NewRow
                dr.Item("MyInt") = rnd.Next(1, 1000)
                dt.Rows.Add(dr)
            Next

        Catch ex As Exception
            Console.WriteLine(ex.Message)
        Finally
            dc = Nothing
            dr = Nothing
            rnd = Nothing
        End Try

        Return dt
    End Function

End Module