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If a new class is inherited from a class where this isn t the case, the base class might at some point change, breaking the derived class Some less-experienced programmers mistakenly believe that inheritance is supposed to be used widely in object-oriented programming and therefore use it far too often Inheritance should be used only when the advantages it brings are needed2 See the upcoming Polymorphism and Virtual Functions section In the NET common language runtime (CLR), all objects are inherited from the ultimate base class named object, and there s only single inheritance of objects (in other words, an object can be derived from only one base class) This prevents the use of some common idioms available in multiple-inheritance systems such as C++, but it also removes many abuses of multiple inheritance and provides a fair amount of simplification In most cases, it s a good trade-off The .

Developing a user interface with Tk is a case of creating a number of nested objects The first object you create is the main window for your application The nested objects are the individual widgets that make up the user interface A widget is a button, text box, menu, or any of a variety of other components used to build up your interface within your window

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Numerous sources, including application interfaces and batch programs, may save character data in tables It is not safe to assume that character data has been entered in a case-consistent manner The character case conversion functions serve two important purposes They may be used, first, to modify the appearance of a character data item for display purposes and, second, to render them consistent for comparison operations It is simpler to search for a string using a consistent case format instead of testing every permutation of uppercase and lowercase characters that could match the string Remember that these functions do not alter the data stored in tables They still form part of the read-only SQL query These functions expect string parameters that may consist of string literals, character column values, character expressions, or numeric and date values (which are implicitly converted into strings)

Once you have defined the individual widgets that make up the window, the script then goes into a loop, called the event loop The script accepts events from the user and performs the commands and actions that were defined when the widgets were created This is different from most other Perl scripts, which follow a logical process However, unlike many Perl scripts, users control the execution and choose a number of different options, depending on which button, text box, or other widget they manipulate The basic process for creating a Tk-based GUI application is as follows: 1 Create a window to hold all of your objects The main window is generally known as main or top-level, although it could be called anything 2 Create a number of widgets, defining their contents, actions, and other elements In this example, a label, to hold a simple message, and a button, which when pressed will exit the script, are created 3 Display and arrange the widgets within the window This is frequently handled by the Pack geometry manager, although there are other managers available The geometry manager supplies a function that allows you to control the orientation and spacing of the widgets within the window Although you can exercise a certain amount of control, the geometry manager actually does a lot of the work for you It makes decisions, based on your recommendations, about how to lay out the individual components 4 Start the event loop The main execution of the script has now finished, and the rest of the script will be driven by the events configured for individual widgets Here is a very quick Perl/Tk script that demonstrates this:

The LOWER function replaces the uppercase characters in a string with their lowercase equivalents Its syntax is LOWER(s) The following query illustrates the usage of this function:

use Tk; $main = MainWindow->new(); $main->title("Hello World!"); $label = $main->Label(text => 'Hello from Tk!'); $button = $main->Button(); $icon = $button->Photo(-file => 'icongif'); $button->configure(image => $icon, command => sub { exit; } ); $label->pack(side => 'left'); $button->pack(side => 'left', padx => 5 ); MainLoop();

17:

Assume that the current system date is 17-DEC-2007 The strings 200 , sql , and 17-dec-2007 are returned The numeric and date expressions are evaluated and implicitly converted into character data before the LOWER function is executed The LOWER function is used in the following condition to locate the records with the letters U and R , in any case, adjacent to each other in the LAST_NAME field:

NET runtime allows multiple inheritance in the form of interfaces, which can t contain implementation We ll discuss interfaces in 10..

The result, when run, looks like this on a Windows 98 machine:

select first_name, last_name, lower(last_name) from employees where lower(last_name) like '%ur%';

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