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CacheSize, propriété – Exemple (JScript)

S’applique à : Access 2013, Office 2013

Cet exemple utilise la propriété CacheSize pour monter la différence, en termes de performances, d'une opération effectuée avec et sans cache de 30 enregistrements. Coupez et collez le code ci-après dans le Bloc-notes ou un autre éditeur de texte, et enregistrez-le sous CacheSizeJS.asp.

 
<!-- BeginCacheSizeJS --> 
<%@ Language="JScript" %> 
<%// use this meta tag instead of adojavas.inc%> 
<!--METADATA TYPE="typelib" uuid="00000205-0000-0010-8000-00AA006D2EA4" --> 
 
<HTML> 
<HEAD> 
<title>CacheSize property example (JScript)</title> 
<style> 
<!-- 
body { 
 font-family: 'Verdana','Arial','Helvetica',sans-serif; 
 BACKGROUND-COLOR:white; 
 COLOR:black; 
 } 
.thead2 { 
 background-color: #800000; 
 font-family: 'Verdana','Arial','Helvetica',sans-serif; 
 font-size: x-small; 
 color: white; 
 } 
.tbody { 
 text-align: center; 
 background-color: #f7efde; 
 font-family: 'Verdana','Arial','Helvetica',sans-serif; 
 font-size: x-small; 
 } 
--> 
</style> 
</HEAD> 
<BODY> 
<h1>CacheSize property example (JScript)</h1> 
<% 
 // connection and recordset variables 
 var Cnxn = Server.CreateObject("ADODB.Connection") 
 var strCnxn = "Provider='sqloledb';Data Source=" + Request.ServerVariables("SERVER_NAME") + ";" + 
 "Initial Catalog='Northwind';Integrated Security='SSPI';"; 
 var rsCustomer = Server.CreateObject("ADODB.Recordset"); 
 // caching variables 
 var Now = new Date(); 
 var Start = Now.getTime(); 
 var End, Cache, NoCache 
 
 try 
 { 
 // open connection 
 Cnxn.Open(strCnxn) 
 
 // open a recordset on the Employee table using client-side cursor 
 rsCustomer.CursorLocation = adUseClient; 
 rsCustomer.Open("Customers", strCnxn); 
 
 // loop through the recordset 20 times 
 for (var i=1; i<=20; i++) 
 { 
 rsCustomer.MoveFirst(); 
 while (!rsCustomer.EOF) 
 { 
 // do something with the record 
 var strTemp = new String(rsCustomer("CompanyName")); 
 rsCustomer.MoveNext(); 
 } 
 } 
 
 Now = new Date(); 
 End = Now.getTime(); 
 NoCache = End - Start; 
 
 // cache records in groups of 30 
 rsCustomer.MoveFirst(); 
 rsCustomer.CacheSize = 30; 
 
 Now = new Date(); 
 Start = Now.getTime(); 
 
 // loop through the recordset 20 times 
 for (var i=1; i<=20; i++) 
 { 
 rsCustomer.MoveFirst(); 
 while (!rsCustomer.EOF) 
 { 
 // do something with the record 
 var strTemp = new String(rsCustomer("CompanyName")); 
 rsCustomer.MoveNext(); 
 } 
 } 
 
 Now = new Date(); 
 End = Now.getTime(); 
 var Cache = End - Start; 
 } 
 catch (e) 
 { 
 Response.Write(e.message); 
 } 
 finally 
 { 
 // clean up 
 if (rsCustomer.State == adStateOpen) 
 rsCustomer.Close; 
 if (Cnxn.State == adStateOpen) 
 Cnxn.Close; 
 rsCustomer = null; 
 Cnxn = null; 
 } 
%> 
 
 <table border="2"> 
 <tr class="thead2"> 
 <th>No Cache</th> 
 <th>30 Record Cache</th> 
 </tr> 
 <tr class="tbody"> 
 <td><%=NoCache%></td> 
 <td><%=Cache%></td> 
 </tr> 
 </table> 
 
</BODY> 
</HTML> 
<!-- EndCacheSizeJS -->
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