Question

so here is my function..it works perfect except it filters every cell the contain the number 3 like 300 313 30 43 but i want it to filter only cell values that have only the single digit 3!!

Private Sub LinkLabel4_Click(sender As Object, e As System.EventArgs) Handles LinkLabel4.Click

    Dim search As String
    search = "SELECT * FROM products WHERE rank LIKE '%" & 3 & "%'"

    Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:\db.mdb"
    Dim adapter As New OleDbDataAdapter(search, connectionString)

    Dim dt As New DataTable("products")
    adapter.Fill(dt)
    DataGridView1.DataSource = dt
End Sub

another things is the what would be the select statements for filtering with values between 2 specified numbers, like between 4 and 16
Thanks

Answer 1

If rank is a numeric datatype then your query should be as this

search = "SELECT * FROM products WHERE rank = 3"

and in the second case

search = "SELECT * FROM products WHERE rank >=4 AND rank <= 16"

To render your search parametrized you could write a method like this

Sub RankFilter(ByVal rankLowValue As Integer, Optional ByVal rankHiValue As Integer = -1)

    Dim search As String 
    if rankHiValue = -1 then
        search = "SELECT * FROM products WHERE rank = ?" 
    else
        search = "SELECT * FROM products WHERE rank >= ? and rank <= ?" 

    Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:\db.mdb" 

    Dim adapter As New OleDbDataAdapter(search, connectionString)
    adapters.SelectCommand.Parameters.AddWithValue("@rankLo", rankLowValue)
    if rankHiValue <> -1 then
         adapters.SelectCommand.Parameters.AddWithValue("@rankHi", rankHiValue)
    end if

    Dim dt As New DataTable("products") 
    adapter.Fill(dt) 
    DataGridView1.DataSource = dt 
end sub