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Find an item by non-key column in dataset

Hi, i have an established connection, a valid dataset and a working dataadapter. There is a table and few columns in it. Let me define

dataset: ds
dataadapter: daTable
table: Table
columns in table: itemNo, itemName, UPCcode
key column: itemNo

i need to find out an itemNo by UPCcode value using dataset, not direct connection to database
what should my command look like?

Thanks in advance
0
UnFiRe
Asked:
UnFiRe
  • 2
1 Solution
 
GohdanTheMoblinCommented:
Try this:      

        Dim dr As DataRow() = ds.Tables("Table").Select("UPCcode = " & value)
        If dr.Length > 0 Then
            Dim itemNo As Integer = CInt(dr(0)("itemNo"))
        End If

Assuming itemNo is an Integer.
0
 
UnFiReAuthor Commented:
Hi,
This expression worked to some extent. Thanks a lot for it
However, there is some problem.
I have another column called "OLDITEM" in the same table
It is a text field. In fact all fields are text fields because itemNo and OLDITEM and UPCCode can include letters.
My modified expression of a function to define itemNo by either upc or olditem looks like that:

*******************
Public Function itemNoBy(ByVal byWhat As String, ByVal num As String) As String
        Dim itemNo As String
        Dim dr As DataRow()
       
        'parameters passed to this function are either "upc" or "old"
        Select Case byWhat
            Case "upc"
                dr = myRef.dsJB.Itemweb.Select("UPCCODE = " & num)
            Case "old"
                dr = myRef.dsJB.Itemweb.Select("OLDITEM = " & num)
        End Select

        If dr.Length > 0 Then
            itemNo = dr(0)("itemNo").ToString
        Else
            itemNo = "Not Found"
        End If

        Return itemNo
End Function

***********************

Now, when i pass upc - everything works out perfect, however, when i pass old - i get this error. Why would i get it? All fields have absolutely the same properties, they are all text fields and in my dataset they are all String fields.

An unhandled exception of type 'System.Data.EvaluateException' occurred in system.data.dll

Additional information: Cannot perform '=' operation on System.String and System.Int32.
0
 
GohdanTheMoblinCommented:
Oh, I think I see what's happening.  Suppose num is 555.

When you construct the statement
"UPCCODE = " & num

it is constructed as
"UPCCODE = 555"

which is a numeric search, not a string search.  Try changing those statements to
"UPCCODE = '" & num & "'"

It's tough to see, but there are single quotes in there.
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