Web server administration chap07

The Need for Programming Languages Web pages with just HTML statements are static pages  Pages that contain programming statements allow changes and they are called dynamic pages  Pro

Web Server Administration

Chapter 7Installing and Testing a Programming Environment

 Install and test DBMSs

 Understand the Web-based

programming environment

 Program with databases

The Need for Programming Languages

 Web pages with just HTML

statements are static pages

 Pages that contain programming

statements allow changes and

they are called dynamic pages

 Programming languages can also

be used to update databases and communicate with other systems

 Structured Query Language (SQL)

is the language used to define and manipulate the data

 Most databases are relational and organize data into tables

Database Tables

 A primary key uniquely defines a row of data

 SSN in the Employee table and Department number in the Department table

 A foreign key is a column in a table that is related to a primary key

 Department number in the Employee table

Three Categories of SQL

 Data Manipulation Language (DML)

 Used for programming and to insert, update, delete, and retrieve data

 Data Definition Language (DDL)

 Used to create tables and other

related structures in a database

 Data Control Language (DCL)

 Allows you to control access to tables

Installing and Testing SQL Server

 As with other applications, a wizard

guides you through the installation

 By default, it uses the user name you

logged on as (typically administrator) to gain access to the system

 This should be changed to "Use the Local

System account" for single server systems

 If SQL Server needs to communicate with

other servers, create a special domain account

Installing and Testing SQL

Server-Authentication Mode

 The Windows Authentication Mode

controls access to the database based on Windows users

 The Mixed Mode allows for SQL Server

Installing and Testing SQL

Server-Creating Tables

 The GUI interface is similar to Access in creating a table

Installing and Testing SQL

Server-Filling Tables with Data

 Although SQL statements are often used to manipulate data, you can use something similar to a spreadsheet

Installing and Testing MySQL for Red Hat Linux

 As with other applications, you run an RPM file

 Start MySQL with

Login to mysql and Create

a Database

 To login from the shell prompt use

mysql –uroot –ppassword

 To create a database called hr

create database hr;

 In order to do any operations on

the database such as create

tables, you have to "use" it

use hr;

Create Tables and Insert Data

 The following script creates the employee table and adds three employees

create table employee (

ssn char(9) primary key,

Web-based Programming Environment

 Cookie

 Text that a Web site stores on your disk

 Common Gateway Interface (CGI)

 A protocol that allows the operating system

to interact with the Web server

 Practical extraction and reporting

language (Perl)

 First popular language for Web servers

 Java Server Pages (JSP)

 Language similar to Java

Web-based Programming

Environment

 Active Server Pages (ASP)

 Script-based environment available on all IIS Web servers

 ASP.NET

 Compiled programs operate under NET

Framework

 NET Framework is an integral part of

Windows Server 2003 and can be installed on Windows 2000

 PHP Hypertext Protocol (PHP)

 Popular language available on most platforms

 The structure of JSP, ASP, and PHP are similar

Using Forms

 The following HTML produces a form

 When the submit button is pressed, the data in the form is sent to the file designated as

filename

Using ASP to Process a

Form

 The following file displays the information from the form

 Notice how the items such as "first" match the text

names on the form

 ASP uses <% and %> for opening and closing tags

 <%=request()%> is one way to retrieve data from the form

available under the NET Framework that can be used for the Web

superior to that of ASP

 Has modules for data validation that

differentiates between browsers

 Producing sophisticated reports is much easier

ASP.NET Program that Combines Form and

Output

Shell Script in Linux

 Uses CGI

 First line states that the shell is being used

 Not common because of lack of security

Perl Script to Display

Contents of a Form

 Notice how $cgi->param("first") is similar to ASP’s request("first")

Programming with

Databases

 Microsoft uses two methods to bridge the gap between programming languages and databases

 Open Database Connectivity (ODBC)

 The original standard

 Object Linking and Embedding Database

(OLEDB)

 Current standard which is faster and more flexible

 Linux often uses Java Database

Connectivity (JDBC)

 You can also have a direct connection

between the language (such as PHP) and the database (such as MySQL)

Producing a Report

 Connect to the database

 Execute a SQL select statement to retrieve data from a table

 Put the data in a recordset

 Also known as a resultset, depending

on the environment

 Loop through the recordset and

display the contents

A Report in ASP

Using Data Source Names (DSNs)

 DSNs are connections to databases that

an administrator creates on the server

 They encapsulate the information on the previous slide concerning the

connection information

 The Data Sources (ODBC) wizard is in

the Control Panel

 Once it is created, you can create a

connection with

Conn.open "DSN=humanresources;uid=sa"

Programming with ASP.NET

 Programming languages process

data, allow you to create dynamic Web pages, and can produce other features

 Database management systems

organize data for processing