object oriented database concepts pdf

... 1. Definitions Object- oriented tcchnologics in use today include object- oriented programming languages (e.g., C++ and Smalltalk), object- oriented database systems, object- oriented user interfaces ... systems), etc. An object- oriented technology is a technology that makes available to the users facilities that are based on object- oriented concepts . To define object- oriented concepts , we ... object X whose domain is another object Y is the object identifier (OID) of the object Y. Therefore,ifanapplicationhasalreadyretrievedobjectX,and now would like to retrieve object Y, the database...

Ngày tải lên: 16/03/2014, 16:20

... that is an aggregate object. An aggregate object is an object that has at least one data member that is itself an object. For example, if both Player and Team are objects and Team contains ... behavior of an object when it is displayed, __clone is invoked when you copy your object using the clone operator. This operator (new to PHP 5) allows you to create a copy of an object rather ... functions every bit as well with a database as it did with the DirectoryItems class—it is a reusable object. Where to Go After the Navigator We developed these database classes because they are...

Ngày tải lên: 03/07/2014, 07:20

Ngày tải lên: 03/07/2014, 07:20

Ngày tải lên: 03/07/2014, 07:20

... Friday, May 5, 2006 2:25 PM 2 BASICS OF OBJECT- ORIENTED PROGRAMMING This chapter is aimed at an audience unfamiliar with the basic concepts of object- oriented programming (OOP). The intent ... xiii Introduction xv Chapter 1: What a Tangled Web We Weave 1 Chapter 2: Basics of Object- Oriented Programming 5 Chapter 3: Object- Oriented Features New to PHP 5 11 Chapter 4: Show a Little Class 17 Chapter ... the PageNavigator Class 57 Chapter 9: Database Classes 65 Chapter 10: Improvement Through Inheritance 75 Chapter 11: Advanced Object- Oriented Programming Concepts 91 Chapter 12: Keeping It Fresh...

Ngày tải lên: 24/01/2014, 15:45

... Oracle Database SQL Language Reference for information about date format codes Introduction to Schema Objects 2-2 Oracle Database Concepts Schema Object Types The most important schema objects ... Administrators Database Developers Oracle Database Administrator's Guide Oracle Database Advanced Application Developer's Guide Oracle Database Performance Tuning Guide Oracle Database PL/SQL ... Introduction to Relational Databases 1-2 Oracle Database Concepts The first generation of database management systems included the following types: ■ Hierarchical A hierarchical database organizes data...

Ngày tải lên: 17/03/2014, 00:20

... to many objects ã All through a base pointer Message takes on many forms ã Summary Base-pointer to base -object, derived-pointer to derived ã Straightforward Base-pointer to derived object ã Can ... (base, derived) – Base pointer aimed at base object Derived pointer aimed at derived object ã Both straightforward Base pointer aimed at derived object ã is a relationship Circle is a Point ã Will ... base -object ã Compiler error ã Allowed if explicit cast made (more in section 10.9) 2003 Prentice Hall, Inc. All rights reserved. 4 !"# $%!" ã Aim pointers (base, derived) at objects...

Ngày tải lên: 02/04/2014, 06:20

... the concepts of object- oriented programming using a language like C++ can be an intimidating experience. The simpler object model of PHP makes it the ideal language for an introduction to object- oriented ... Data Lavin, Peter. Object- oriented PHP : concepts, techniques, and code / Peter Lavin. p. cm. Includes index. ISBN 1-59327-077-1 1. PHP (Computer program language) 2. Object- oriented programming ... xiii Introduction xv Chapter 1: What a Tangled Web We Weave 1 Chapter 2: Basics of Object- Oriented Programming 5 Chapter 3: Object- Oriented Features New to PHP 5 11 Chapter 4: Show a Little Class 17 Chapter...

Ngày tải lên: 03/07/2014, 07:20

... wants to make the switch to an OO approach, Object- Oriented PHP can ease the transition from procedural to object- oriented programming (OOP). Basic concepts are introduced using simple but useful ... presented here in tabular form. Companion Website This book has a companion website (http://objectorientedphp.com) where you can download all the code related to it. Downloads are available ... used in conjunction with MySQL classes to page through a database of articles. Resources are added and displayed using PDO and an SQLite database. Finally, documentation of internal PHP classes...

Ngày tải lên: 03/07/2014, 07:20

... Friday, May 5, 2006 2:25 PM 2 BASICS OF OBJECT- ORIENTED PROGRAMMING This chapter is aimed at an audience unfamiliar with the basic concepts of object- oriented programming (OOP). The intent ... few basic concepts of OOP as it relates to PHP, though it is sometimes useful to look at other object- oriented (OO) languages such as Java or C++. We’ll discuss three aspects of object orientation ... access modifiers, and inheritance. Classes define objects, access modifiers determine how objects can be used, and inheritance makes it easy to adapt objects for different cir- cumstances. I’ve emphasized...

Ngày tải lên: 03/07/2014, 07:20

... Object- Oriented Features New to PHP 5 15 This is perfectly acceptable behavior for primitives, but it incurs far too much overhead with objects. Making a copy of a large object by ... different database systems is only made possible by the new object model. Given the importance of databases, we’ll deal with them extensively in this book. We’ll develop a MySQL database class ... indirectly when an object is passed to a function or method, but objects are now passed by reference because of the implicit assignment. Prior to PHP 5, the default behavior was to assign objects by...

Ngày tải lên: 03/07/2014, 07:20

... syntax for creating an object is the same, but in PHP 5, the __construct method is executed rather than a method bearing the class name. NOTE In PHP 5, you need not return the object created by the ... the variable or instance of the object, and new both allocates memory and, in association with the class name, invokes the constructor. (When creating an object under PHP 4, it is advisable ... programming assumes that other programmers may use your objects and vice versa. Bruce Eckel refers to this as client programmers using objects created by class creators. 1 Even if you are...

Ngày tải lên: 03/07/2014, 07:20

... only Portable Document Format (PDF) files by passing the value pdf to this method. This method returns true if all file extensions in this directory match pdf. OOPHP_02.book Page 31 Friday, ... a mixture of .pdf files and images in a specific directory and you want to download all the .pdf files and after that, display all the images. Once you have filtered for .pdf files, you ... not be called directly, and the client programmer benefits by having a fully-formed and usable object immediately upon construction. Must It Be Private? Suppose for a moment, though, that your...

Ngày tải lên: 03/07/2014, 07:20

... screening out illegal values. While the need to control the way in which object properties are changed is somewhat obvious, retrieving object properties through an accessor method is also superior to ... appropriate image type before changing the quality. A set method is superior to direct access to an object s properties because values can be tested and rejected, if need be, before they are assigned. ... to have both a set and get method for image quality. The quality property of a ThumbnailImage object is quite different from an image’s MIME type and is not something that must remain fixed....

Ngày tải lên: 03/07/2014, 07:20

... navigator; this will greatly improve the reusability of the class. (This isn’t directly related to object- oriented programming [OOP], but if a class’s appearance cannot blend with various different ... constructor; that’s exactly what the checkRecordOffset method does. It terminates construction of your object if it returns false. Let’s see why. private function checkRecordOffset($recordoffset, $recordsperpage){ ... through the list of images in an orderly fashion?” CSS and Reusability No matter how reusable an object is, it won’t be reused if it can’t be adapted to fit to a variety of page designs. Unlike...

Ngày tải lên: 03/07/2014, 07:20

... one page OOPHP_02.book Page 62 Friday, May 5, 2006 2:25 PM 9 DATABASE CLASSES The last chapter ended by saying we would create a database class in order to test the versatility of the page ... that it’s sometimes difficult to identify objects, because often what’s needed is something conceptual rather than something physical and concrete. The database class or classes that we are going ... used to create any number of result sets taken from any database on that server. It simply sets up communication between a web page and a database server. A result set makes use of a connection...

Ngày tải lên: 03/07/2014, 07:20

... MySQLException object is displayed. Any object used within a foreach loop must devise its own implementation of the iterator methods. The implementation will differ depending upon the nature of the object an ... always an object. Any Exception that occurs within the scope of the try block will look for a catch that has a matching Exception type as its argument. NOTE The identification of the object type ... lot of time creating database classes because they are useful tools for making websites dynamic. In the next chapter, we’re going to take a detailed look at some of the concepts introduced here....

Ngày tải lên: 03/07/2014, 07:20

Ngày tải lên: 03/07/2014, 07:20

Ngày tải lên: 03/07/2014, 07:20

Ngày tải lên: 03/07/2014, 07:20