By James Larson
With no stepping into the main points and complexities of particular advertisement items, this ebook introduces database administration suggestions that transcend modern day relational database administration platforms - for example, dispensed, textual, multi-media and object-oriented. It covers disbursed database administration structures, the hazards linked to them, and substitute recommendations to the most important pitfalls and technical difficulties; considers 3 sorts of textual established structures details retrieval, hoovering and filtering - and describes a number of ways to allotted textual database administration structures; explores DBMSs that deal with a number of new media forms, and the distinct difficulties brought by way of multimedia; and describes the elemental ideas of object-oriented info and the categories of DBMS that deal with them.
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Additional resources for Database Directions: From Relational to Distributed, Multimedia and Object-Oriented Database Systems
Fortunately, the compiler will issue an error when you do this. Nested if Statements You can nest if statements when needed. Nesting is nothing more than following an if statement with one or more additional if statements. Caption := `X is between 10 and 20'; Keep in mind that these are simplified examples. In the real world, you can get lost in the maze of begin and end statements that separate one code block from the next. Take a look at this code snippet, for instance: if X > 100 then begin Y := 20; if X > 200 then begin Y := 40; if X > 400 then begin Y := 60; DoSomething(Y); end; end; end else if X < -100 then begin Y := -20; if X < -200 then begin Y := -40; if X < -400 then begin Y := -60; DoSomething(Y); end; end; end; Even this is a fairly simple example, but you get the idea.
Because Windows was written in C, many Windows functions require a character array as a parameter. The Pascal string types are not character arrays, so a way of enabling Pascal strings to work with Windows functions requiring a character array is needed. The PChar type fills this need. A PChar can be used anywhere a character array is needed. An example is the Windows MessageBox function. This function, which displays a standard Windows message dialog, has the following declaration: function MessageBox(hWnd: HWND; lpText, lpCaption: PChar; uType: UINT): Integer; The second and third parameters require a pointer to a character array (the second for the message box text and the third for the message box caption).
Other subroutines might take one or more parameters and might return a value. Rules for naming functions and procedures are the same as those discussed earlier for variables. New Term: A function is a section of code separate from the main program that performs some action and returns a value. New Term: A parameter is a value passed to a function or procedure that is used to alter its operation or indicate the extent of its operation. 2 shows the anatomy of a function. 2. The anatomy of a function.