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CGI_PERL - CGI Programming Using Perl

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Duration: 3 Days

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Course Information

Course Description

​This course bridges the gap between using HTML to create static Web pages and using Perl CGI scripts to create dynamic Web pages. The course emphasizes using the Perl 5 CGI library routines to process HTML forms by providing extensive working examples and by students writing applications to illustrate the concepts presented. This course is not intended to be a substitute for a Perl programming course.


Course Objectives

Course Audience

​Web site developers wanting to create interactive Web pages.

Course Outline

​1. Course Introduction

  • Course Objectives
  • Course Overview
  • Suggested References

2. The Internet and the Web
  • TCP/IP and Ports
  • DNS vs. Hosts Files
  • Servers and Clients
  • Client/Server Protocols

3. Browsers and Servers
  • URLs
  • WEB Browsers and Servers
  • The Hypertext Transfer Protocol
  • HTTP Requests and Responses
  • HTTP Headers
  • HTTP Requests
  • Mime Types

4. Introduction to CGI
  • HTML Tag Structure
  • HTML Document Structure
  • URLs and CGI
  • CGI Programs
  • Running and Debugging from the Command Line
  • Running and Debugging from a Browser
  • Handling an HTML Form with CGI
  • Generating HTML

5. CGI and Perl
  • Perl
  • Perl Programs
  • Why Use CGI.pm (and Where is It?)
  • Running and Debugging from the Command Line
  • Generating HTML with CGI.pm
  • Running and Debugging from a Browser

6. Generating HTML
  • Introduction to CGI.pm
  • How to use CGI.pm's Online Documentation
  • CGI.pm's Rules for General HTML Tags
  • CGI.pm's Rules for HTML Form Tags
  • Named vs. Positional Parameters in CGI.pm

7. Generating Forms
  • General Structure of HTML Forms
  • Form Element Tags
  • Pushbuttons
  • Radiobuttons
  • Checkboxes
  • Popups and Listboxes
  • Textfields, Passwords, and Textareas

8. CGI Data Flow Architecture
  • URL Encoding and Decoding
  • Data Flow between Browsers and Servers
  • GET vs. POST
  • Which to Use?
  • CGI Environment Variables
  • Accessing CGI's Environment Variables

9. Processing Form Data
  • Static Forms
  • Dynamic Forms
  • Controlling Flow with User Input
  • Accessing Form Data Using CGI.pm
  • The param Method of CGI.pm
  • Sticky Widgets
  • Validating Input from the Browser
  • Command Line Debugging

10. Client-Side Statefulness
  • Stateful vs Stateless
  • Why use Stateful CGI Applications?
  • Program to Program Interaction
  • Stateful Access with Hidden Fields
  • Multiple Forms and Hidden Fields
  • Stateful Access with Netscape Cookies
  • Using Cookies with CGI.pm
  • Cookie Management

11. Database Access
  • Server-Side Statefulness
  • Flat-File Databases
  • Structuring Text Data
  • File Permissions and Flat-File Databases
  • Perl's DBM Interface
  • Perl's DBI/DBD Interface
  • Issues with Statefulness

12. Additional Web Programming Features
  • Extra Path Information
  • Frames
  • Server Side Includes (SSI)
  • The exec command
  • A Page Hit Counter Using SSI
  • Animation Description
  • Netscape's Server Push
  • Client Pull
  • The GD.pm Module

13. CGI Security Issues
  • Browser to Server Security Issues
  • CGI Security Issues
  • CGI Interaction with the Operating System
  • Database / File System Overflow
  • CGI and User Authentication

14. Appendix 1 - Overview of Perl
  • What is Perl?
  • Running Perl Programs
  • Sample Program
  • Another Sample Program
  • Yet Another Example

15. Appendix 2 - Perl Variables
  • Three Types of Variables
  • Variable Names and Syntax
  • Variable Naming
  • Lists
  • Scalar and List Contexts
  • Hashes
  • Hash Functions

​16. Appendix 3 - Flow Control
  • Simple Statements
  • Simple Statement Modifiers
  • Compound Statements
  • The next, last, and redo Statements
  • The for Loop
  • The foreach Loop

Course Prerequisites

​Familiarity with HTML forms. Programming experience is required. Basic UNIX skills and the ability to use VI or a basic text editor are also required.
Course Schedule
This course is not scheduled yet.

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