By Scot Hillier
This ebook is designed to get the reader began speedy developing company functions with COM+. The 5 components of the ebook surround knowing COM+ functions, information companies Layer, company prone Layer, consumer providers Layer, and the ultimate project.In the final element of the e-book, readers will placed all that they discovered within the earlier chapters to paintings by means of constructing the PubsOnLine.com software. This software is meant as an entire studying program that makes use of the various positive aspects awarded within the ebook.
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Extra info for Scot Hillier's COM+ Programming with Visual Basic (Sams White Book Series)
The Advanced Tab Advanced, the sixth and final tab on the component property sheet, allows you to specify the class that can handle exceptions that occur when a queued component doesn’t receive a message. Normally undelivered messages are sent to the dead-letter queue, but COM+ will attempt to call the exception class, if specified, before delivering unreceived messages to the dead-letter queue. 24 shows the Advanced tab. Installing COM+ Components into an Application After you have created a new COM+ application, you will want to install components in it.
Developers are often content to display database information in tables and lists without much care for the end-user experience. This mentality reaches its pinnacle when developers dump thousands of records into a single Web page of search results and declare their job complete simply because the data is now visible. Users are then left to fend for themselves as they wade through thousands of records searching for the data they really need. Another significant disadvantage of two-tier applications is that they are difficult to maintain.
This is superior to the use of database triggers that reside directly in the data services layer. A separate business services layer also offers an opportunity to construct an application that shares components in the middle tier. This means that all clients using the application can take advantage of the functionality provided by the business services. This is a significant advantage in maintenance because changes to the shared central tier will immediately affect all clients on the system. This type of design virtually eliminates the need to constantly revise software on many client machines.
Scot Hillier's COM+ Programming with Visual Basic (Sams White Book Series) by Scot Hillier