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mpdillon
 asked on

Are SQL Parameters compatible with .Net SQLDataAdapters?

I cannot get the following code to execute without this error. "Must declare the Scalar variable @CusNo".
           With MacCmd
                .Parameters.Clear()
                .Parameters.AddWithValue("@CusNo", CusNoString)
            End With
            ParmString = "Select M.Cus_No, M.Cus_Name, A.IDNo From " &     CompanyNameString & ".dbo.ARCusFil_SQL M " & _
            "Inner Join Amatex.dbo.AMTransferHdr A " & _
            "ON M.Cus_no = A.CusNo where CusNo = @CusNo " & _
            "Order by A.IDNo Desc"
            '
             MacCmd.CommandText = ParmString
            '
            Dim dataadapter As New SqlDataAdapter(ParmString, MacConn)
            Dim ds As New DataSet()
            Dim dt As New DataTable
            '
            Application.DoEvents()
            dataadapter.Fill(dt)  '<== Fails here
            CoConn.Close()

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When I remove the Parameter, @CusNo and directly substitute the value, the SQLDataAdapter does not fail. See below.
            ParmString = "Select M.Cus_No, M.Cus_Name, A.IDNo From " &   CompanyNameString & ".dbo.ARCusFil_SQL M " & _
            "Inner Join Amatex.dbo.AMTransferHdr A " & _
            "ON M.Cus_no = A.CusNo where CusNo = '000000106800' " & _
            "Order by A.IDNo Desc"
            '
            MacCmd.CommandText = ParmString

            '
            Dim dataadapter As New SqlDataAdapter(ParmString, MacConn)
            Dim ds As New DataSet()
            Dim dt As New DataTable
            '
            Application.DoEvents()
            dataadapter.Fill(dt)  '<== Does not fail when I use the actual variable value
            CoConn.Close()

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Is there a way to use Parameters with a SQLDataAdapter?

Thanks,
pat
.NET ProgrammingVisual Basic.NET

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Last Comment
mpdillon

8/22/2022 - Mon
igordevelop

Hi,

You must first declare the SqlCommand and later pass the parameter. You were doing the reverse.

Try this, should work:

ParmString = "Select M.Cus_No, M.Cus_Name, A.IDNo From " &     CompanyNameString & ".dbo.ARCusFil_SQL M " & _
            "Inner Join Amatex.dbo.AMTransferHdr A " & _
            "ON M.Cus_no = A.CusNo where CusNo = @CusNo " & _
            "Order by A.IDNo Desc"
            '
                   MacCmd.Parameters.Clear()
             MacCmd.Parameters.AddWithValue("@CusNo", CusNoString)
             MacCmd.CommandText = ParmString
            '
            Dim dataadapter As New SqlDataAdapter(ParmString, MacConn)
            Dim ds As New DataSet()
            Dim dt As New DataTable
            '
            Application.DoEvents()
            dataadapter.Fill(dt)
            CoConn.Close()


Let me know if anything.

Regards,
Igor
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kaufmed

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igordevelop

Hi,

@kaufmed
The command is assigned in this line:
Dim dataadapter As New SqlDataAdapter(ParmString, MacConn)

It is not necessary to do it again.
mpdillon

ASKER
Assigning the paramaters to the dataadapter works great.I thought that the Parameters were associated with the SQLCommand, MacCmd, but apparently the parameters must be assigned to the dataadapter.
Here is my final code.

MacCmd.CommandText = ParmString
            '
            Dim dataadapter As New SqlDataAdapter(ParmString, MacConn)
            Dim dt As New DataTable
            With dataadapter
                .SelectCommand.Parameters.Clear()
                .SelectCommand.Parameters.AddWithValue("@CusNo", CusNoString)
            End With
            '
            Application.DoEvents()
            dataadapter.Fill(dt)  '<== Code no longer fails here

Thank you for your assistance.
pat
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