Maxxus PRO SPK-23 Spezifikationen PDF herunterladen (Seite 10)

100

101

PHP AND MYSQL WEB DEVELOPMENT

Returning Values from Functions ......................................................141

Code Blocks ..................................................................................142

Recursion ............................................................................................143

Further Reading ..................................................................................145

Next ....................................................................................................145

6 Object-Oriented PHP 147

Object-Oriented Concepts ..................................................................148

Classes and Objects ......................................................................148

Polymorphism ................................................................................149

Inheritance ....................................................................................150

Creating Classes, Attributes, Operations in PHP ..............................150

Structure of a Class ......................................................................151

Constructors ..................................................................................151

Instantiation ........................................................................................152

Using Class Attributes ........................................................................152

Calling Class Operations ....................................................................154

Implementing Inheritance in PHP ......................................................155

Overriding ......................................................................................156

Multiple Inheritance ......................................................................157

Designing Classes ..............................................................................158

Writing the Code for Your Class ........................................................159

Next ....................................................................................................168

PART II Using MySQL 169

7 Designing Your Web Database 171

Relational Database Concepts ............................................................172

Tables ............................................................................................173

Columns ........................................................................................173

Rows ..............................................................................................173

Values ............................................................................................173

Keys ..............................................................................................173

Schemas ........................................................................................175

Relationships ................................................................................175

How to Design Your Web Database ....................................................176

Think About the Real World Objects You Are Modeling ............176

Avoid Storing Redundant Data ....................................................176

Use Atomic Column Values ..........................................................178

Choose Sensible Keys ..................................................................179

Think About the Questions You Want to Ask the Database ..........179

Avoid Designs with Many Empty Attributes ................................179

Summary of Table Types ..............................................................180

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