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272 Using Database Files At one time, dBASE was the most popular database file format, so you still see many programs that can create, store, and save data in a dBASE file. Because many companies made dBASE-compatible programs, the dBASE file format is also known by a generic term as xBASE. Structure of a database To understand how programs can store information in a database file, you need to understand the basic structure of a database. A database consists of a file, which is what you physically store and save on a disk. A database file typically consists of one or more tables with each table organizing related data. For example, you might have a database file containing customer information. Then you might divide that database file into three tables with one table containing current customers, a second table containing potential customers, and a third table containing inactive customers, as shown in Figure 8-6. Database file Tables Tables Records Fields Figure 8-6: Database files are divided into tables, and each table is further divided into records and fields. Tables Each table is further divided into records with each record containing information about a single item, such as a customer. Each record is further divided into fields with each field storing a single chunk of data, such as a name, a telephone number, or an e-mail address.
Using Database Files 273 Think of a Rolodex file as a database file, the entire collection of business cards as a single table, each business card as a record, and each chunk of information on the business card (name, phone number, address, and so on) as a separate field. Most database files are relational databases because the information stored in each table can be shared to avoid duplication. For example, one table might contain a list of customers, and a second table might contain a list of prospects (potential customers). Sometimes a customer can also be a prospect, so you could store that same person’s name twice — once in the customer table and once in the prospect table. However, you don’t want to store duplicate information because if you update that information, you need to make sure you update that same information everywhere. So a simpler solution is to relate tables together that essentially share data. So the prospect table might physically contain the customer information whereas the customer table might only contain unique information, such as the type of product the customer bought and the total sales amount. To retrieve the customer’s name and address, the customer table simply points to that information stored in the prospect table, as shown in Figure 8-7. Book II Chapter 8 Reading and Saving Files Connecting to a database To save information to a database file, a program needs to identify ✦ The database file to use ✦ The table to use ✦ The record to use ✦ The specific field to view, edit, or store data Although it’s possible to write your own subprograms to access a database file, retrieve information from a specific table, record, and field, and then save those changes again, this usually takes way too long to write and test. As a faster alternative, most programmers either buy a third-party database toolkit or (if they’re lucky) use the built-in database controls that come with their language compiler. A database toolkit essentially acts like a middleman between your program and a database file, as shown in Figure 8-8. So rather than worry about the physical details of a particular database file, you just have to tell the database toolkit what you want to do and the toolkit figures out how to do it, such as saving new information in a database table.
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Beginning Programming ALL-IN-ONE DE
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Beginning Programming ALL-IN-ONE DE
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About the Author I started off as a
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Acknowledgments This is the part of
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Contents at a Glance Introduction .
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Table of Contents Introduction.....
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Table of Contents xi Finding an Int
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Table of Contents xiii Playing with
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Table of Contents xv Using Structur
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Table of Contents xvii Searching wi
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Table of Contents xix Book VI: Prog
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Table of Contents xxi Declaring Con
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Introduction If you enjoy using a c
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How to Use This Book 3 means they
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Book I Getting Started
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Chapter 1: Getting Started Programm
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How Computer Programming Works 9 De
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The History of Computer Programming
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Figuring Out Programming 17 As a ge
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Figuring Out Programming 19 ✦ Lin
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Figuring Out Programming 21 Convert
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Figuring Out Programming 23 certain
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Getting Started with Programming 25
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Knowing Programming versus Knowing
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Chapter 2: Different Methods for Wr
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Spaghetti Programming without a Pla
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Planning Ahead with Structured Prog
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Making User Interfaces with Event-D
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Making User Interfaces with Event-D
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Organizing a Program with Object-Or
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Chapter 3: Types of Programming Lan
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Choosing Your First Language 51 ext
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Teaching Languages 53 Principles Be
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Teaching Languages 55 The Interacti
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Teaching Languages 57 near future.
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Teaching Languages 59 The main disa
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Teaching Languages 61 Book I Chapte
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“Curly Bracket” Languages 63
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“Curly Bracket” Languages 65 Th
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“Curly Bracket” Languages 67 C#
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“Curly Bracket” Languages 69 Vi
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Artificial Intelligence Languages 7
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Scripting Languages 73 2. From the
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Scripting Languages 75 In compariso
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Scripting Languages 77 Transferring
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Database Programming Languages 79 @
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Comparing Programming Languages 81
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Chapter 4: Programming Tools In Thi
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Choosing a Compiler 85 3. Choose a
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Choosing a Compiler 87 than other c
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Choosing a Compiler 89 With a cross
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Finding an Interpreter 91 In the ol
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Compiling to a Virtual Machine 93 C
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Writing a Program with an Editor 95
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Fixing a Program with a Debugger 97
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Creating a Help File 103 Obviously,
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Dissecting Programs with a Disassem
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Chapter 5: Managing Large Projects
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Software Engineering Methods 109 Fi
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Software Engineering Methods 111 de
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Software Engineering Methods 113 Ad
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Automating Software Engineering wit
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The Pros and Cons of Software Engin
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Book II Programming Basics
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Chapter 1: How Programs Work In Thi
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Using Keywords as Building Blocks 1
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Organizing a Program 131 So if your
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Dividing a Program into Subprograms
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Dividing a Program into Objects 135
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Dividing a Program into Objects 137
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Creating a User Interface 139 The u
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Chapter 2: Variables, Data Types, a
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Declaring Variables 143 This BASIC
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Declaring Variables 145 You can alw
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Declaring Variables 147 Every progr
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Using Different Data Types 149 type
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Retrieving Data from a Variable 151
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Using Constant Values 153 Using Con
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Defining the Scope of a Variable 15
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Chapter 3: Manipulating Data In Thi
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Using Math to Manipulate Numbers 16
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Using Math to Manipulate Numbers 16
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Manipulating Strings 167 Most progr
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Finding Strings with Regular Expres
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Finding Strings with Regular Expres
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Using Comparison Operators 173 Comp
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Using Boolean Operators 175 Most pr
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Using Boolean Operators 177 So if t
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Converting Data Types 179 Both type
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Chapter 4: Making Decisions by Bran
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Picking One Choice with the IF-THEN
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Picking Three or More Choices with
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Picking Three or More Choices with
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Playing with Multiple Boolean Opera
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Making Multiple Choices with the SE
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Chapter 5: Repeating Commands by Lo
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Looping a Fixed Number of Times wit
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Looping Zero or More Times with the
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Playing with Nested Loops 209 This
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Checking Your Loops 211 Outer loop
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Chapter 6: Breaking a Large Program
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Creating and Using Subprograms 215
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Creating and Using Subprograms 217
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Passing Parameters 219 The #include
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Page 247 and 248: Passing Parameters 223 When you pas
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Page 251 and 252: Repeating a Subprogram with Recursi
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Page 257 and 258: How Object-Oriented Programming Wor
Page 259 and 260: Encapsulation Isolates Data and Sub
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Page 263 and 264: Sharing Code with Inheritance 239 S
Page 265 and 266: Sharing Code with Inheritance 241 F
Page 267 and 268: Design Patterns 243 However, when y
Page 269 and 270: Design Patterns 245 The flyweight p
Page 271 and 272: Object-Oriented Languages 247 Becau
Page 273 and 274: Real-Life Programming Examples 249
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Page 285 and 286: Storing Data in Text Files 261 A co
Page 287 and 288: Storing Data in Text Files 263 Read
Page 289 and 290: Storing Fixed Size Data in Random-A
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Page 293 and 294: Storing Varying Size Data in Untype
Page 295: Using Database Files 271 Figure 8-5
Page 299 and 300: Using Database Files 275 When using
Page 301 and 302: Chapter 9: Documenting Your Program
Page 303 and 304: Adding Comments to Source Code 279
Page 309 and 310: Writing Software Documentation 285
Page 311 and 312: Writing Software Documentation 287
Page 313 and 314: Chapter 10: Principles of User Inte
Page 315 and 316: The Evolution of User Interfaces 29
Page 317 and 318: Elements of a User Interface 293 GU
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Page 333 and 334: Book III Data Structures
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Page 337 and 338: Using Structures 313 If you wanted
Page 339 and 340: Using an Array 315 the array, which
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Page 345 and 346: Working with Multi-Dimensional Arra
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Using Structures with Arrays 323 Th
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Drawbacks of Arrays 325 To store da
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Drawbacks of Arrays 327 Suppose you
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Chapter 2: Sets and Linked Lists In
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Using Sets 331 Adding (and deleting
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Using Sets 333 This command asks th
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Using Sets 335 Bill Evans John Doe
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Using Linked Lists 337 This tells t
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Using Linked Lists 339 Each time yo
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Drawbacks of Sets and Linked Lists
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Drawbacks of Sets and Linked Lists
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Chapter 3: Collections and Dictiona
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Using a Collection 347 Every elemen
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Using a Collection 349 When you del
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Using a Collection 351 Figure 3-6:
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Understanding Hash Tables 353 Every
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Understanding Hash Tables 355 VP Ke
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Understanding Hash Tables 357 ✦ D
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Understanding Hash Tables 359 In ge
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Chapter 4: Stacks, Queues, and Dequ
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Using a Stack 363 Like a collection
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Using Queues 365 Counting and searc
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Using Queues 367 Adding data to a q
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Using Queues 369 Figure 4-6: The Pe
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Using Deques 371 Initially, a deque
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Using Deques 373 Figure 4-11: The U
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Chapter 5: Graphs and Trees In This
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Understanding Graphs 377 457 miles
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Understanding Graphs 379 Figure 5-4
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Creating Trees 381 Figure 5-5: A tr
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Creating Trees 383 For example, an
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Taking Action on Trees 385 Traversi
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Taking Action on Trees 387 10 8 12
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Taking Action on Trees 389 10 8 12
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Book IV Algorithms
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Chapter 1: Sorting Algorithms In Th
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Using Bubble Sort 395 32 9 74 21 Or
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Using Insertion Sort 397 32 9 74 21
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Using Shell Sort 399 32 9 74 21 50
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Using Heap Sort 401 Heap sort dumps
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Using Merge Sort 403 94 46 74 21 32
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Using Quick Sort 405 Using Quick So
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Comparing Sorting Algorithms 407 If
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Chapter 2: Searching Algorithms In
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Sequential Search 411 Backward or f
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Sequential Search 413 Binary search
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Sequential Search 415 Fibonacci num
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Using Indexes 417 102 John Smith 55
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Adversarial Search 419 The more lev
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Adversarial Search 421 So if the co
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Chapter 3: String Searching In This
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Sequential Text Search 425 In this
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Sequential Text Search 427 The Shif
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Searching with Regular Expressions
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Searching Phonetically 431 Both sym
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Searching Phonetically 433 If you h
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Chapter 4: Data Compression Algorit
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Lossless Data Compression Algorithm
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Lossy Data Compression 443 Basicall
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Chapter 5: Encryption Algorithms In
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The Basics of Encryption 447 in a m
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The Basics of Encryption 449 Stream
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The Basics of Encryption 451 Electr
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Symmetric/Asymmetric Encryption Alg
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Cracking Encryption 455 Sender’s
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Cracking Encryption 457 Instead of
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Cracking Encryption 459 Code cracki
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Book V Web Programming
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Chapter 1: HyperText Markup Languag
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The Structure of an HTML Document 4
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The Structure of an HTML Document 4
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Defining the Background 469 Adding
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Making Tables 471 The anchor point
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Making Tables 473 Book V Chapter 1
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Making Tables 475 Column 1 Column
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Chapter 2: CSS In This Chapter Und
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Creating Style Classes 479 color :
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Separating Styles in Files 481 Sepa
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Cascading Stylesheets 483 If you ha
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Chapter 3: JavaScript In This Chapt
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Declaring Variables 487 need to def
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Using Operators 489 The relational
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Branching Statements 491 To make th
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Using Arrays 493 A variation of the
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Designing User Interfaces 495 A con
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Chapter 4: PHP In This Chapter Und
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Declaring Variables 499 Declaring V
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Using Operators 501 Table 4-3 Logic
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Branching Statements 503 Command; }
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Creating Functions 505 If you don
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Creating Objects 507 Creating Objec
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Chapter 5: Ruby In This Chapter Un
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Using Operators 511 # long time to
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Using Operators 513 Table 5-3 Logic
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Looping Statements 515 Command else
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Using Data Structures 517 Using Dat
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Creating Objects 519 To tell an obj
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Book VI Programming Language Syntax
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Chapter 1: C and C++ In This Chapte
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Declaring Variables 525 Despite min
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Declaring Variables 527 All integer
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Using Operators 529 Relational oper
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Branching Statements 531 Table 1-6
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Looping Statements 533 switch (expr
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Data Structures 535 If a function d
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Using Objects 537 Now you can decla
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Using Objects 539 To inherit from m
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Chapter 2: Java and C# In This Chap
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Declaring Variables 543 The double
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Using Operators 545 Declaring float
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Using Operators 547 The increment o
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Branching Statements 549 if (condit
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Looping Statements 551 Because no b
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Data Structures 553 If the function
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Data Structures 555 You can create
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Using Objects 557 So if you created
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Chapter 3: Perl and Python In This
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Using Operators 561 You can write b
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Using Operators 563 The relational
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Looping Statements 567 In Python, t
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Perl Data Structures 569 A typical
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Python Data Structures 571 Creating
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Using Objects 573 After you define
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Chapter 4: Pascal and Delphi In Thi
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Declaring Variables 577 Creating Co
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Declaring Constants 579 Declaring d
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Looping Statements 583 Looping Stat
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Data Structures 585 FUNCTION Functi
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Creating Objects 587 clear a dynami
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Chapter 5: Visual Basic and REALbas
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The Structure of a BASIC Program 59
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Declaring Variables 593 Declaring i
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Declaring Constants 595 Declaring B
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Branching Statements 599 The preced
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Creating Subprograms and Functions
Page 627 and 628:
Data Structures 603 Data Structures
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Creating Objects 605 Creating Objec
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Book VII Applications
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Chapter 1: Database Management In T
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The Basics of Databases 611 To retr
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The Basics of Databases 613 Althoug
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The Basics of Databases 615 Employe
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Manipulating Data 617 Tables divide
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Manipulating Data 619 The Join comm
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Manipulating Data 621 SET PhoneNumb
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Database Programming 623 Figure 1-1
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Chapter 2: Bioinformatics In This C
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The Basics of Bioinformatics 627 Un
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Searching Databases 629 ✦ Swiss-P
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Bioinformatics Programming 631 Alth
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Chapter 3: Computer Security In Thi
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Stopping Malware 635 Worms Similar
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Stopping Hackers 637 Stopping Hacke
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Secure Computing 639 Forensics If y
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Secure Computing 641 start. The ide
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Chapter 4: Artificial Intelligence
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Problem Solving 645 Game-playing Be
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Problem Solving 647 Expert System K
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Problem Solving 649 Humans can unde
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Problem Solving 651 Such speech rec
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Machine Learning 653 With LISP, eve
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Machine Learning 655 Robotics and a
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`Chapter 5: The Future of Computer
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Picking an Operating System 659 opt
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Cross-Platform Programming 661 Unfo
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Cross-Platform Programming 663 The
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Cross-Platform Programming 665 Anot
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The Programming Language of the Fut
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The Programming Language of the Fut
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Index Numerics 0 (zero) initializin
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Index 673 blocks of commands in cur
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Index 675 dictionaries versus, 352
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Index 677 database management conne
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Index 679 enumerated variables (C/C
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Index 681 hybrid OOP languages, 246
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Index 683 knowledge base, 646, 647
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Index 685 modeling, 44-45 Modula-2
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Index 687 advantages and disadvanta
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Index 689 looping statements, 600-6
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Index 691 extreme programming metho
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Index 693 source code as, 264 tab-d
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Index 695 as event-driven programmi
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