VB.Net參數化LIKE查詢

Question

我正在編寫一個代碼，它將使用格式zone-rate-customer_number過濾帳號。其中一個例子是125-12-35，其中125是區域，12是費率，35是客戶編號。在我的搜索文本框中，我想輸入區域和客戶號碼，這會排除費率。這裏是我的代碼

 Dim search As String = txtsearch.Text 
     Dim sql As String = "SELECT * FROM tblCustomer WHERE [account no] LIKE '%' + @search + '%'" 

     Dim cmd As OleDbCommand = New OleDbCommand() 
     cmd.Connection = Con 
     cmd.CommandType = CommandType.Text 
     cmd.CommandText = sql 
     cmd.Parameters.AddWithValue("[account no]", search) 

我怎樣才能夠在我的表中只使用區域和客戶號碼搜索？

Answer 1

首先，您應該分別收集「區域」和「客戶編號」（例如，在單獨的文本框中）。然後你可以使用

' test data 
Dim zone As String = "125" 
Dim customer_number As String = "35" 

Using cmd As New OleDbCommand 
    cmd.Connection = con 
    cmd.CommandText = 
      "SELECT * FROM tblCustomer WHERE [account no] LIKE ?" 
    cmd.Parameters.AddWithValue("?", zone & "-%-" & customer_number) 
    Using rdr As OleDbDataReader = cmd.ExecuteReader 
     Do While rdr.Read 
      Console.WriteLine(rdr("account no")) 
     Loop 
    End Using 
End Using