Exception Error Handling Implementation in MySQL/VB.NET Windows Database Applications

 
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Old 02-10-2009
Exception Error Handling Implementation in MySQL/VB.NET Windows Database Applications

Error handling implementation in Windows database applications is a must for any Application Developer today. The main idea of error handling is to avoid application crashes by finding out the occurred errors and fixing them. Different programming languages have different ways of implementing error handling. Microsoft Visual Basic .NET (VB.NET) is the most common programming language for developing windows database applications today. VB.NET codes are provided in many websites, books and materials without error handling implementation. In this article I would like to introduce you to the basics of error handling implementation in MySQL/VB.NET windows database applications. I'll be covering structured exception error handling, which was introduced for the first time in VB.NET 2002. I will also go over the latest technologies of disposing unmanaged recourses in .NET Framework with the Using statement. To write exception errors to a log text file, a generic procedure will be developed while MySQL data is loading, inserting, updating and deleting.

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Mail::Transport::Receive(3pm)				User Contributed Perl Documentation			     Mail::Transport::Receive(3pm)

NAME
Mail::Transport::Receive - receive messages INHERITANCE
Mail::Transport::Receive is a Mail::Transport is a Mail::Reporter Mail::Transport::Receive is extended by Mail::Transport::IMAP4 Mail::Transport::POP3 SYNOPSIS
my $receiver = Mail::Transport::POP3->new(...); my $message = $receiver->receive($id); DESCRIPTION
Each object which extends Mail::Transport::Receive implement a protocol which can get messages into your application. The internals of each implementation can differ quite a lot, so have a look at each separate manual page as well. Current message receivers: o Mail::Transport::POP3 Implements the POP3 protocol. See also Mail::Box::POP3. METHODS
Constructors Mail::Transport::Receive->new(OPTIONS) See "METHODS" in Mail::Transport Receiving mail $obj->receive([UNIQUE-MESSAGE-ID]) Receive one message from the remote server. Some receivers will provide the next message automatically, other are random access and use the specified ID. Server connection $obj->findBinary(NAME [, DIRECTORIES]) See "Server connection" in Mail::Transport $obj->remoteHost() See "Server connection" in Mail::Transport $obj->retry() See "Server connection" in Mail::Transport Error handling $obj->AUTOLOAD() See "Error handling" in Mail::Reporter $obj->addReport(OBJECT) See "Error handling" in Mail::Reporter $obj->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK]) Mail::Transport::Receive->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK]) See "Error handling" in Mail::Reporter $obj->errors() See "Error handling" in Mail::Reporter $obj->log([LEVEL [,STRINGS]]) Mail::Transport::Receive->log([LEVEL [,STRINGS]]) See "Error handling" in Mail::Reporter $obj->logPriority(LEVEL) Mail::Transport::Receive->logPriority(LEVEL) See "Error handling" in Mail::Reporter $obj->logSettings() See "Error handling" in Mail::Reporter $obj->notImplemented() See "Error handling" in Mail::Reporter $obj->report([LEVEL]) See "Error handling" in Mail::Reporter $obj->reportAll([LEVEL]) See "Error handling" in Mail::Reporter $obj->trace([LEVEL]) See "Error handling" in Mail::Reporter $obj->warnings() See "Error handling" in Mail::Reporter Cleanup $obj->DESTROY() See "Cleanup" in Mail::Reporter $obj->inGlobalDestruction() See "Cleanup" in Mail::Reporter DIAGNOSTICS
Warning: Avoid program abuse: specify an absolute path for $exec. Specifying explicit locations for executables of email transfer agents should only be done with absolute file names, to avoid various pontential security problems. Warning: Executable $exec does not exist. The explicitly indicated mail transfer agent does not exists. The normal settings are used to find the correct location. Error: Package $package does not implement $method. Fatal error: the specific package (or one of its superclasses) does not implement this method where it should. This message means that some other related classes do implement this method however the class at hand does not. Probably you should investigate this and probably inform the author of the package. SEE ALSO
This module is part of Mail-Box distribution version 2.105, built on May 07, 2012. Website: http://perl.overmeer.net/mailbox/ LICENSE
Copyrights 2001-2012 by [Mark Overmeer]. For other contributors see ChangeLog. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html perl v5.14.2 2012-05-07 Mail::Transport::Receive(3pm)