Caching in ASP 3.0

jasonsalas · Oct 21, 2002

Hi everyone,

This is a 2-part question:

(1) If I implement the following line at the top of an ASP page that uses a databse connection, will the page necessarily be cached?

<% Response.Expires = 5 %>

(2) Also, if I include the same Response.Cache statement for a database-driven ASP page that has information in the query string to extract a specific record from a database, will the page itself be cached, or is this a moot point, becaise every value in the query string represents a new and unique "page"?

http://localhost/myPage.asp?id=8675309

http://localhost/myPage.asp?id=12345

http://localhost/myPage.asp?id=2546

http://localhost/myPage.asp?id=9

Thanks much!

Tarwn · Oct 22, 2002

1)The 5 specifies a cache time of 5 minutes. If you extend it further than the specific address will be cached for the longer period of time. If you wish to do a no-cache than you can set the Response.Expires = -1, in otherwords the page expires one minute ago.
2)You are correct, since each address is unique due to the querystring, it is reloaded from scratch each time rather than cached. The only way to be sure it will load the cached version is to pass it the exactly same variables/value sets in the same order in the querystring.
This is often used by people as a poor mans no-cache, by generating a random number and assigning it to a dummy variable in the querystring.

-Tarwn --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
For my next trick I will pull a hat out of a rabbit (if you think thats bad you should see how the pigeon feels...)

jasonsalas · Oct 22, 2002

Thanks for the feedback...for some reason, it's not registering (in me, mentally, that is).

I'm using this script:

<% @ Language = VBScript %>
<% Response.Expires = 1 %>

<html><body>
This is the time on the server: <%= Now() %>
</body></html>

...and for some reason, it doesn't seem to be caching. I use ASP.NET a lot now, and it's caching facilities are out of this world, and I'm trying to write something for my ASP 3 pages that will provide similar functionality, so a requesting user doesn't have to go all the way back to the database each time.

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Caching in ASP 3.0

jasonsalas

IS-IT--Management

Tarwn

Programmer

jasonsalas

IS-IT--Management

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