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.
Hello All,
I have a question ....which I am totally confused about!
If I have a fxn foo in a program which returns a logical value. But it has a posssiblity to throw some exception.
Now my exception handler returns a value as a string stating why the exception occured.
But my... (1 Reply)
Sometimes when I try to use curl to upload to an ftp server, I get the message:
$curl -T file.wmv ftp.eu.filesonic.com --user user:password
curl: (8) Got a 421 ftp-server response when 220 was expected
How do I get the script to try again if I get the message curl: (8)? (2 Replies)
Hi Friend,
Could you please provide me with some tutorial for Advanced Exception handling in C++, mainly set_terminate() and set_unexpected() functions?
Please find the details below:
OS: Unix
Compiler: gcc.
Thanks. :)
Awesome001 (0 Replies)
Hi,
I have written a script to load csv files into a mysql database, however, i would like for the shell script to exit in the event of an error (missing file, load error etc.) - currently if an error is encountered the next statement is processed - This is how i am loading the csv scripts
... (5 Replies)
Hi all,
I am writing a set of scripts and some of these are nested within others. I want to be able to execute a single high-level script at the command-line, which in turn may invoke other scripts as required, and when a failure occurs in any of the nested scripts, I want to be able to track... (2 Replies)
Anybody happen to be familiar with any deficiencies with g++ 2.95.3 regarding exception handling, specifically in multi-threaded / multi-module (shared library) based applications?
I'm seeing behavior where thrown exceptions are not caught, but basically ignored causing the application to... (0 Replies)
XtAppGetErrorDatabaseText() XtAppGetErrorDatabaseText()
Name
XtAppGetErrorDatabaseText - get the text of a named message from the error database.
Synopsis
void XtAppGetErrorDatabaseText(app_context, name, type, class, default, buffer_return, nbytes, database)
XtAppContext app_context;
String name, type, class;
String default;
String buffer_return;
int nbytes;
XrmDatabase database;
Inputs
app_context
Specifies the application context.
name Specifies the name or general kind of the message.
type Specifies the type or detailed name of the message.
class Specifies the resource class of the error message.
default Specifies the default message to use if an error database entry is not found.
nbytes Specifies the size of buffer_return in bytes.
database Specifies the database to be used, or NULL if the application's database is to be used.
Outputs
buffer_return
Specifies the buffer into which the error message is to be returned.
Description
XtAppGetErrorDatabaseText() looks up the message named by name, type, and class in database or in the database returned by XtAppGetError-
Database() for app_context if database is NULL. If such a message is found, it is stored into buffer_return, otherwise the message in
default is stored into buffer_return.
The resource name of the message is formed by concatenating name and type with a single "." between them. The resource class of the mes-
sage is class if it already contains a ".", or otherwise is formed by concatenating class with itself with a single "." between the
strings.
Usage
You should not need to call XtAppGetErrorDatabaseText() unless you are writing a customized high-level error or warning handler.
Because the Intrinsics do not support the customization and internationalization of error messages very well, some applications may want to
read a customized error database (found with XtResolvePathname() or named by an application resource, for example) and provide customized
error and warning handlers that call XtAppGetErrorDatabaseText() specifying this custom database explicitly.
While the X Toolkit specification permits individual error databases for each application context, most implementations will only support a
single database. In the MIT implementation, the error database file is /usr/lib/X11/XtErrorDB.
See AlsoXtAppGetErrorDatabase(1),
XtErrorMsgHandler(2).
Xt - Error Handling XtAppGetErrorDatabaseText()
