php and mysql for client-server database interaction chapter 10
TRANSCRIPT
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PHP and MySQL for Client-Server Database Interaction
Chapter 10
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Overview and Objectives:New Functionality
• Browse through our product catalog without registering (that is, “anonymously”)
• Open an account by registering with our website• Log in to our website as a registered user, and later
log out• Browse through our product catalog as a registered
user, order various items online, and manage a shopping cart
• Purchase the shopping cart items and then check out
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Skills That Will Be Learned
• How a PHP script connects to a MySQL database
• How a PHP script issues queries about customers or products to a MySQL database and then receives and processes the replies
• More about PHP arrays• How to use a PHP session to keep track of a
user’s activity during a visit to our website
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Current State of Our Website
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Bird's Eye View of e-store Functionality
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PHP Code for Connecting to MySQL<?php //db.php $db_location = "localhost"; $db_username = "webbook"; $db_password = "secret"; $db_database = "webbook"; $db_connection = mysql_connect("$db_location","$db_username","$db_password") or die ("Error - Could not connect to MySQL Server"); $db = mysql_select_db($db_database,$db_connection) or die ("Error - Could not open database");?>
Information supplied:• The location of the MySQL server ($db location)• The user’s MySQL username ($db username)• The user’s password ($db password)
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Important Start
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Registering for Our Web Site
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You can go to the CD and get this page as a starting point, then edit it.
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Registration Scenarios
• During the registration process we must be prepared to deal with at least the following possible scenarios:– Successful registration– Does not pass JavaScript validation on the client
side– Already registered and has perhaps forgotten they
have done so, which will be recognized when the user is discovered to be in the database already
– Choosing a login name that is already in useChapter 10: PHP and MySQL for Client-Server Database Interaction
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XHTML and PHP Code for the Registration Form
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These are .php files
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Validating the Form Data (1 of 3)
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Validating the Form Data (2 of 3)
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Validating the Form Data (3 of 3)
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Chapter 10: PHP and MySQL for Client-Server Database Interaction
The php files for the customer registration process
db.php
Simply opens the database connection and saves it as a variable
processRegistration.php
This does the actual query to save the data to the database. Also contains the functions to handle the exceptions
registration.phpCalls the processRegistration script/page and provides a place to return to when the processing is done. Not very big
register.phpThis is the page that the user will enter into the url to open up. It all starts from here.It has the form in it to collect the data. (also calls validation)
I suggest we start with trying to add someone to our customer table.
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Messages
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Re-registering for the Site with Different e-mail but Same Username
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XHTML and PHP Code for Processing the Registration Data
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Built in function to start maintaining the idea “state” or “session” variables.
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Main Program from processRegistration.php (1 of 2)
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Main Program from processRegistration.php (2 of 2)
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Check next slide to use the $_POST superglobal to actual grab the data the user typed in to the form.
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Chapter 10: PHP and MySQL for Client-Server Database Interaction
VALUES ( NULL, '$_POST[firstName]', '$_POST[middleInitial]', '$_POST[lastName]', '$_POST[email]', '$unique_login', '$_POST[loginPassword]', '$_POST[phone]', '$_POST[address]', '$_POST[city]', '$_POST[state]', '$_POST[zip]', '$_POST[country]');";
I believe this correctNotice the addition of “ ‘$_POST[…….]’”
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A Helper Function from processRegistration.php
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Another Helper Function from processRegistration.php
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PHP Arraysphp > //The following command creates an array:php > $a[] = "Hello";php > //We omitted the subscript so the next availablephp > //subscript is used, which is 0 in this case.
Chapter 10: PHP and MySQL for Client-Server Database Interaction
php > //Cannot use the echo command to print an array.
php > echo $a;Arrayphp > //But ... the echo command can print elements of an array.
php > echo $a[0];Hello
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PHP Arraysphp > //Let us now add a number of elements to our array.
php > $a[] = "World";php > $a[-90] = "This is wild";php > $a[90] = "This is wild";php > $a[70] = "This is wild";php > $a[name] = "Pawan";
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PHP Arraysphp > //You can use the print_r() function to print an entire array.
php > print_r($a);Array([0] => Hello[1] => World[-90] => This is wild[90] => This is wild[70] => This is wild[name] => Pawan)php > //As we can see, the indexes are not ordered as you would havephp > //expected, since -90 comes after 1, and 70 comes after 90.
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PHP Arraysphp > //You can delete an element using the function unset
php > unset($a[-90]);php > print_r($a);Array([0] => Hello[1] => World[90] => This is wild[70] => This is wild[name] => Lingras)php > //The count() gives you the size of an array.
php > echo count($a);7
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PHP Arraysphp > //The "construct" array() (not a function) can be used to create an entire array.
php > $a = array("This", "is", "different", 5, 6, 7);php > print_r($a);Array([0] => This[1] => is[2] => different[3] => 5[4] => 6[5] => 7)
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PHP Arrays: Summary• A PHP array index is really just a means of accessing a particular
element in an array. It does not necessarily suggest an ordering. That is why we can use -90 as an index, which is stored in the array after the index 1.
• If we do not use an index to place a value in an array, the first numeric index greater than the last-used numeric index is used.
• Array elements can be displayed using echo, but you need to use the built-in function print_r() to print an entire array.
• A function called count() gives us the size of an array.• An entire array can be created by using the array() construct.• If we want conventionally ordered numeric indices from an
associative array, we can use the function array_values().
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Chapter 10: PHP and MySQL for Client-Server Database Interaction
$_SESSION
• Super global• Array containing session variables available as
a global (that you define the index)• Temporarily store data specific to a particular
user while he/she surfs your website.• data is stored on web server• At the beginning of your script, make a call to
the session_start() function
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Logging In to the e-store
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Opening Lines of PHP Code and XHTML Markup for the Login Form
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JavaScript Code for Validating the Login Form Data Entries
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Rest of the XHTML Markup and PHP Code for the Login Form (1 of 2)
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Rest of the XHTML Markup and PHP Code for the Login Form (2 of 2)
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PHP Code:Processing Login Form (1 of 2)
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From the login page
Load the session array
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PHP Code:Processing Login Form (2 of 2)
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Page it came from
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Request For a User to Try Again after a Failed Login
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Passing Key/Value Pairs in a URL$goto = "Location: ../purchase.php?prod=$prod";header('Location: ../login.php?retry=true');
• At the end of each of these lines we see a ? separating a key/value pair in which the key and value are themselves separated by an equals sign.
• The value half of the pair can be provided as a literal value (true) or as a variable ($prod).
• More than one key/value pair can be passed along in this way, in which case an & separates the key/value pairs:login.php?retry=true&otherKey=otherValue
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PHP Code forProcessing the Logout (1 of 2)
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Destroy the session
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PHP Code forProcessing the Logout (2 of 2)
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Display Indicating a Successful Logout
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Display When an Attempt is Made to Log Out Without Having Logged In
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e-store After Successful Login
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Revised banner.php (1 of 2)
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Revised banner.php (2 of 2)
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Listing of the Departments and Product Categories in Our e-store
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PHP Code for DisplayingDepartments and Categories (1 of 2)
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PHP Code for DisplayingDepartments and Categories (2 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
Use a query to display the department
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A listing of the Individual Productsin a Category
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PHP Code for Displaying Productsin a Category (1 of 2)
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PHP Code for Displaying Productsin a Category (2 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
Building an HTML table from the numRecords result and a loop
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Purchasing a First Product
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Purchasing Additional Products:Trying to Buy More than the Stock
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Try Again: Do not RequestMore than Available
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Viewing the Shopping Cart withTwo Items: Ready for Checkout
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PHP Code for Main Part of the PHP Script for Processing Purchases (1 of 3)
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PHP Code for Main Part of the PHP Script for Processing Purchases (2 of 3)
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PHP Code for Main Part of the PHP Script for Processing Purchases (3 of 3)
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PHP Function for Retrieving Product Information for an Order-in-progress
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PHP Function for Creating a New Order
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PHP Function for Displaying the Table Header for the Shopping Cart Display
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PHP Function for Displaying the Table Footer for the Shopping Cart Display
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PHP Function for Displaying the First Four Table Columns for a Product
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PHP Function for Displaying the Last Three Columns for Each Existing Item
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PHP Function for Displaying the Last Three Columns for Each New Item
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PHP Code forAdding a New Item to the Cart (1 of 3)
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PHP Code forAdding a New Item to the Cart (2 of 3)
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PHP Code forAdding a New Item to the Cart (3 of 3)
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PHP Code forDeleting an Item from the Cart
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A Shopping Cart with a Single Item: Ready for Checkout
Chapter 10: PHP and MySQL for Client-Server Database InteractionCourtesy of Nature’s Source.
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Receipt Displayed upon Completion of the Checkout Process
Chapter 10: PHP and MySQL for Client-Server Database InteractionCourtesy of Nature’s Source.
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Confirming the Reduction in Inventory after Purchase
Chapter 10: PHP and MySQL for Client-Server Database InteractionCourtesy of Nature’s Source.
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XHTML and PHP Code for Relevant Parts from payment.php
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Code the Main Part of the Script for Processing a Payment
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function forMarking an Order as Paid (1 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function forMarking an Order as Paid (2 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function for Marking Each Individual Item as Paid (1 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function for Marking Each Individual Item as Paid (2 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function for Reducing the Inventory Level After Payment (1 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction
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PHP Function for Reducing the Inventory Level After Payment (2 of 2)
Chapter 10: PHP and MySQL for Client-Server Database Interaction