Question

I would like to retrieve a single column of about 800 rows in a table and save these values in an array so as to reference them later on. How can I do it? I tried:

    con = New OleDb.OleDbConnection("provider=SQLOLEDB;data source=PC;initial catalog=DB1;integrated security=SSPI")  

    cmd = New OleDbCommand("select col1 from table1", con)

    con.Open()

    r = cmd.ExecuteReader

    While r.Read

        prev_ob(i) = r.Item(0)(0)

        i = i + 1

    End While

    For i = 0 To UBound(prev_ob)

        Console.WriteLine(prev_ob(i))

    Next`

And it didn’t work. The col1 is of type Int64 and so is the array prev_ob(). Please let me know how I can save it to an array.

Answer 1

What is the error your are getting? More information will help you in getting an answer sooner.

Try this:

Dim int64list As New List(Of Int64)

cmd = New OleDbCommand("select col1 from table1", con)

    con.Open()
    r = cmd.ExecuteReader

    While r.Read

        int64list.Add(Convert.ToInt64(r.Item(0))

    End While

For Each obj In int64list
     Console.WriteLine(obj)
Next obj

PS I wrote a sample that works in C# and tried translating to VB.net.