Επεξεργασία

Κοινή χρήση μέσω

MoveFirst, MoveLast, MoveNext, and MovePrevious Methods Example (VBScript)

  • Άρθρο

This example uses the MoveFirst, MoveLast, MoveNext, and MovePrevious methods to move the record pointer of a Recordset based on the supplied command.

Cut and paste the following code into Notepad or another text editor, and save it as MoveFirstVBS.asp. You can view the result in any browser.

<!-- BeginMoveFirstVBS -->  
<%@ Language=VBScript %>  
<%' use this meta tag instead of adovbs.inc%>  
<!--METADATA TYPE="typelib" uuid="00000205-0000-0010-8000-00AA006D2EA4" -->  
<HTML>  
<HEAD>  
<TITLE>ADO MoveNext, MovePrevious, MoveLast, MoveFirst Methods</TITLE>  
  
<SCRIPT LANGUAGE="VBScript">  
<!--  
   Sub cmdDown_OnClick  
      'Set Values in Form Input Boxes and Submit Form  
      Document.form.MoveAction.Value = "MovePrev"  
      Document.Form.Submit  
   End Sub  
  
   Sub cmdUp_OnClick  
      Document.form.MoveAction.Value = "MoveNext"  
      Document.Form.Submit  
   End Sub  
  
   Sub cmdFirst_OnClick  
      Document.form.MoveAction.Value = "MoveFirst"  
      Document.Form.Submit  
   End Sub  
  
   Sub cmdLast_OnClick  
      Document.form.MoveAction.Value = "MoveLast"  
      Document.Form.Submit  
   End Sub  
//-->  
</SCRIPT>  
</HEAD>  
  
<body bgcolor="white">   
<h1 align="center">ADO MoveNext, MovePrevious <br> MoveLast & MoveFirst Methods</h1>  
<% ' to integrate/test this code replace the   
   ' Data Source value in the Connection string%>  
<%   
   ' connection and recordset variables  
   Dim Cnxn, strCnxn  
   Dim rsEmployees, strSQLEmployees  
  
   ' open connection  
    Set Cnxn = Server.CreateObject("ADODB.Connection")  
    strCnxn = "Provider='sqloledb';Data Source=" & _  
            Request.ServerVariables("SERVER_NAME") & ";" & _  
            "Integrated Security='SSPI';Initial Catalog='Northwind';"  
    Cnxn.Open strCnxn  
  
    ' create and open Recordset using object refs  
   Set rsEmployees = Server.CreateObject("ADODB.Recordset")  
   strSQLEmployees = "Employees"  
  
   rsEmployees.ActiveConnection = Cnxn  
   rsEmployees.CursorLocation = adUseClient  
   rsEmployees.CursorType = adOpenKeyset  
   rsEmployees.LockType = adLockOptimistic  
   rsEmployees.Source = strSQLEmployees  
   rsEmployees.Open  
  
   rsEmployees.MoveFirst  
  
   If Not IsEmpty(Request.Form("MoveAction")) Then  
      strAction = Request.Form("MoveAction")  
      varPosition  = Request.Form("Position")  
  
      rsEmployees.AbsolutePosition = varPosition  
  
      Select Case strAction  
  
        Case "MoveNext"  
  
         rsEmployees.MoveNext  
         If rsEmployees.EOF Then  
            rsEmployees.MoveLast  
            strMessage = "Can't move beyond the last record."  
         End If  
  
        Case "MovePrev"  
  
         rsEmployees.MovePrevious  
         If rsEmployees.BOF Then  
            rsEmployees.MoveFirst  
            strMessage = "Can't move beyond the first record."  
         End If  
  
        Case "MoveLast"  
  
         rsEmployees.MoveLast  
  
        Case "MoveFirst"  
  
         rsEmployees.MoveFirst  
  
      End Select  
   End If  
  
%>  
  
<!-- Display Current Record Number and Recordset Size -->  
<h2>Record Number <%=rsEmployees.AbsolutePosition%> of <%=rsEmployees.RecordCount%></H2>  
<hr>  
<table cellpadding=5 border=0>  
<!-- BEGIN column header row for Customer Table-->  
<tr>  
   <th>Name</th>  
   <th>Hire Date</th>  
</tr>  
  
<!--Display ADO Data from Customer Table-->  
<tr>  
  <td><%= rsEmployees("LastName") & ", " %>   
      <%= rsEmployees("FirstName") & " " %></td>  
  <td><%= rsEmployees("HireDate")%></td>  
</tr>   
<tr>  
  <td colspan=2><%=strMessage%></td>  
</tr>  
</table>  
  
<hr>  
  
<form Name="Form" Method="Post" Action="MoveFirstVbs.asp">  
<Input Type=Button Name=cmdDown Value="<">  
<Input Type=Button Name=cmdUp Value=">">  
<BR>  
<H3>Click Direction Arrows to Use MovePrevious or MoveNext</H3>  
<Input Type=Button Name=cmdFirst Value="First Record">  
<Input Type=Button Name=cmdLast Value="Last Record">  
  
<!-- Use Hidden Form Fields to record values to send to Server -->  
  
<input Type="Hidden" Size="4" Name="MoveAction" Value="Move">  
<input Type="Hidden" Size="4" Name="Position" Value="<%= rsEmployees.AbsolutePosition%>">  
</form>  
  
<HR>  
</BODY>  
  
<%  
    ' clean up  
    If rsEmployees.State = adStateOpen then  
        rsEmployees.Close  
    End If  
    If Cnxn.State = adStateOpen then  
        Cnxn.Close  
    End If  
%>  
</HTML>  
<!-- EndMoveFirstVBS -->

See Also

MoveFirst, MoveLast, MoveNext, and MovePrevious Methods (ADO)
Recordset Object (ADO)