May 2007
Intermediate to advanced
1152 pages
30h 53m
English
book
Access™ 2007 VBA Programmer's Reference
by Teresa Hennig, Rob Cooper, Geoffrey Griffith, Armen Stein
Content preview from Access™ 2007 VBA Programmer's Reference
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22.4. Access Database Engine Expression Service
The Expression Service has been a part of the Jet database engine for a long time. It is used whenever and wherever expressions are evaluated in Access and also it communicates with the VBA expression service. If you think about all the places in Access that can accept an expression, that's a lot! In terms of security, the surface area for expressions is quite large, so it was not feasible for Microsoft to add expressions to the digital signature for a database. The performance implications of scanning each entry point for an expression would have brought a database to its proverbial knees. (Databases don't really have knees.)
Microsoft takes security very seriously, and it's looking at its software for anything that provides an opportunity for someone to exploit it and maliciously attack your computer. You've seen how the Shell function could be used maliciously. So, how do you protect against an expression that can be misused?
The answer is by enhancing the sandbox mode for the Expression Service. Sandbox mode was first introduced in Jet 3.5 Service Pack 3 and Jet 4.0 Service Pack 1. That's right—for Access 97 and 2000. The enhancements made to the Expression Service for Access 2003 actually made expressions more usable than in previous versions. An enhanced sandbox mode was half of the overall security story for Access 2003. But this book is about Access 2007.
22.4.1. Sandbox Mode in Access 2007
When sandbox mode is enabled in ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.