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使用ADO的批量更新方法UpdateBatch

时间：2004/10/7 19:07:00来源：本站整理作者：蓝点我要评论(0)

　　　　　　　　　　　　
　　　　　　　　　　　　　
　　　　　　　　　　　　　　
　　　　　　　　　　　　　
　　　　　　　　　　　　
　　　　　　　　　　　　



　　　　　　　　　　　　'**************************************
' Name: Batch Update using ADO
' Description:ADO has a great batch upda
' te feature that not many people take adv
' antage of. You can use it to update many
' records at once without making multiple
' round trips to the database. Here is how
' to use it.
' By: Found on the World Wide Web
'
'
' Inputs:None
'
' Returns:None
'
'Assumes:None
'
'Side Effects:None
'
'Warranty:
'code provided by Planet Source Code(tm)
' (http://www.Planet-Source-Code.com) 'as
' is', without warranties as to performanc
' e, fitness, merchantability,and any othe
' r warranty (whether expressed or implied
' ).
'**************************************




<%
Set cn = Server.CreateObject("ADODB.Connection")
Set rs = Server.CreateObject("ADODB.RecordSet")
cn.Open Application("guestDSN")
rs.ActiveConnection = cn
rs.CursorType = adOpenStatic
rs.LockType = adLockBatchOptimistic
rs.Source = "SELECT * FROM authors"
rs.Open
If (rs("au_fname") = "Paul") or (rs("au_fname") = "Johnson") Then
newval = "Melissa"
Else
newval = "Paul"
End If
If err <> 0 Then
%>
Error opening RecordSet
<% Else %>
Opened Successfully

<% End If %>

Before Batch Update

<% For i = 0 To rs.Fields.Count - 1 %>

<% Next %>

<% For j = 1 To 5 %>

<% For i = 0 To rs.Fields.Count - 1 %>

<% Next %>

<%
rs.MoveNext
Next
rs.MoveFirst
%>

<%= rs(i).Name %>

<%= rs(i) %>

Move randomly In the table and perform updates To table.

<%
Randomize
r1 = Int(rnd*3) + 1 ' n Itterations
r2 = Int(rnd*2) + 1 ' n places skipped between updates
For i = 1 To r1
response.write "Itteration: " & i & "
"
rs("au_fname") = newval
For j = 1 To r2
rs.MoveNext
response.write "Move Next
"
Next
Next
rs.UpdateBatch adAffectAll
rs.Requery
rs.MoveFirst
%>
<% rs.MoveFirst %>

After Changes

<% For i = 0 To rs.Fields.Count - 1 %>

<% Next %>

<% For j = 1 To 5 %>

<% For i = 0 To rs.Fields.Count - 1 %>

<% Next %>

<%
rs.MoveNext
Next
rs.Close
Cn.Close
%>

<%= rs(i).Name %>

<%= rs(i) %>

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