一段返回隨機記錄的代碼

來源:互聯網
上載者:User
隨機 很久沒用ACCESS了,只是看到經常碰到有人問如何返回隨機記錄的問題,所以就貼了上來,隨便看看。

<!--#include virtual="/adovbs.inc"-->
<%
Dim objConn
Dim objRst
Dim strSQL
Dim strConnection
Dim str
Dim str1
Dim cnt
Dim cnt1
Dim rndMax
Dim RndNumber

strConnection="driver={Microsoft Access Driver (*.mdb)};dbq=" & server.mappath("/testdb.mdb")
strSQL = "SELECT id FROM tblQuestions"

set objConn = Server.CreateObject("ADODB.Connection")
Set objRst = Server.CreateObject("ADODB.Recordset")
objConn.Open strConnection
set objRst.ActiveConnection = objConn
objRst.LockType = adLockOptimistic
objRst.CursorType = adOpenKeySet
objRst.Open strSQL

objRst.MoveLast
cnt = objRst.RecordCount
cnt1 = cnt
rndMax = cnt

If CInt(Request.Form("maxNumber")) < cnt Then
cnt1 = CInt(Request.Form("maxNumber"))
End If

str = ","
str1 = ","

Do Until cnt1 = 0
Randomize
RndNumber = Int(Rnd * rndMax)

If (InStr(1, str1, "," & RndNumber & "," ) = 0) Then
str1 = str1 & RndNumber & ","
cnt1 = cnt1 - 1
objRst.MoveFirst
objRst.Move RndNumber
str = str & objRst("id") & ","
End If

Loop

objRst.Close
Set objRst = Nothing

sql = "SELECT * FROM tblQuestions WHERE (((InStr(1,'" & str & "',(',' & [id] & ',')))<>0)) "
Set objRst = Server.CreateObject("ADODB.Recordset")
set objRst.ActiveConnection = objConn
objRst.LockType = adLockOptimistic
objRst.CursorType = adOpenKeySet
objRst.Open sql
%>
...DISPLAY THE RECORDS RETURNED...
<%
objRst.Close
Set objRst = Nothing

objConn.Close
Set objConn = Nothing
%>



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