PHP & MySQL Database -...

transcript

Dr. Tom HicksComputer Science Department

PHP & MySQL Database

Database SystemsCSCI-3343

WWW Organization

It Is A Good Idea To

Create A Folder For

Each Web Page

Place Most Items, On

Page, In That Folder!2

WWW SetUp

Create Folders

Quadratic, FirstPrime, & RandomNo

Drag .php Pages Into Their Proper Folders

If You Do So Inside Expression Web, The Links Will Adjust

Within Site!

(You Will Not Have To Change Main-Menu.php)

Add The Link Below To The Bottom Of

Quadratic.php

RandomNo.php

FirstPrime.php

<p><A href="../Main-Menu.php"> Return To Main Menu </A>

Add The Link Below To The Bottom Of Each

Of Your Other Pages As Well!

Database

Export

With A Script!7

MySQLNative Import - Export

Use mysqldump!

cd C:\Program Files\MySQL\MySQL Server 8.0\bin

mysqldump -ptrinity -uroot stanford > c:\temp\stanford2.sql

Command Line Export Database

Database

Export

With MySQL

Workbench - Done10

Database

Import

With A Script!11

Use mysql!

Create database Stanford2 must be created before the import!

cd C:\Program Files\MySQL\MySQL Server 8.0\bin

mysql -ptrinity -uroot stanford2 < c:\temp\stanford2.sql

Command Line Import Database

Database

Import

With MySQL

Workbench - Done13

phpinfo()

Create Page Student-Display.php

Student-Display.php Confirm that the PHP is working!

phpinfo();

Connect To

Database

Create Folder

Student-Display

Create Page

Use Expression Web To Create Page

Student-Display.php

Modify Menu Page

Link Student-Display.php

Modify Page Student-Display.php

Add The Code:

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="root";$password="trinity";$database="libraryth1";

$con=mysqli_connect($server, $username, $password, $database);?>

We Changed The Original PHP.ini To Make This Work!

Create Page Student-Display.php

This is the same as the previous page!

<?php/*================================================================ Connect To MySQL Database ================================================================*/$conn = new mysqli();$conn->connect("localhost","root","trinity","libraryth");

Modify php.ini -3-

Edit C:\Program Files\PHP\php.ini

In order to keep PHP lean and mean, many of the optional extensions

are turned off.

We must turn on the MySQL extensions.

Modify php.ini -4A-

We must often tell the system where we are storing these optional

(MySQL) extensions.

Modify php.ini -4B-

Edit C:\Program Files\PHP\php.ini

We must often tell the system where we are storing these optional

(MySQL) extensions.

Database

Modify Page Student-Display.php -1-

Change the connection portion to the following:

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser";$password="trinity"; //Use Your Password $database="stanford";

Stanford User Privileges On Stanford DB

Stanford Cannot Change DB.

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser";$password="trinity"; //Use Your Password $database="stanford";

Try Bad Server localhost1

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost1"; $username="StanfordUser";$password="trinity"; //Use Your Password $database="stanford";

Try Bad UserName StanfordUser1

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser1";$password="trinity"; //Use Your Password $database="stanford";

Try Bad Password trinity1

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser1";$password="trinity1"; //Use Your Password $database="stanford";

Try Bad Database stanford1

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser1";$password="trinity"; //Use Your Password$database="stanford1";

Blank Is Good!-1-

Connection Established!

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser";$password="trinity"; //Use Your Password$database="stanford";

Add the Query : Use Your Name!

. . ./*================================================================ Query ================================================================*/$query = "SELECT * FROM Users";$recSet = $conn->query($query);

echo "<CENTER><H1> Display Students </H1></CENTER>";echo "<CENTER><H2> Written By Dr. Tom Hicks </H2></CENTER><HR>";

Cycle Through The Record Set Loop: print the data

. . . echo "<CENTER><H1> Display Students</H1></CENTER>";echo "<CENTER><H2> Written By Dr. Tom Hicks </H2></CENTER><HR>";

echo "<pre><P>";/*================================================================ Loop Through Records In Record Set ================================================================*/while(list($sID, $sName, $GPA) = $recSet->fetch_row())

printf("<strong>%3d %-15s %4.2f </strong> <BR>", $sID, $sName, $GPA);

echo "</h2></pre>";?>

<p><A href="../Main-Menu.php"> Return To Main Menu </A>

There are several ways to connect.

There are a number of ways to walk through the records.

Inefficient!

Why Read All Of Data If Only Going To Display Part?

More Efficient!

Reduce The Transfer Of Data

There are other ways to Generate the same output.

/*================================================================ Loop Through Records In Record Set ================================================================*/while($Rec = $recSet->fetch_row())

printf("<B>%3d %-15s %4.2f </B> <BR>", $Rec[0], $Rec[1], $Rec[2]);

echo "</h2></pre>";

PHP & MySQLSpecial Thanks To PHP.net For Some Of

The Following Documentation

API – Application Programming Interface

An Application Programming Interface, or API, defines the classes,

methods, functions and variables that your application will need to call

in order to carry out its desired task.

In the case of PHP applications that need to communicate with

databases the necessary APIs are usually exposed via PHP

extensions.

APIs can be Procedural or Object-Oriented.

With a procedural API you call functions to carry out tasks

With the object-oriented API you instantiate classes and then call

methods on the resulting objects.

The Object-Priented API is usually the Preferred Interface, as it

is more modern and leads to better organized code.

When writing PHP applications that need to connect to the MySQL

server there are several API options available.

MySQL Connector

In the MySQL documentation, the term Connector refers to a piece

of software that allows your application to connect to the MySQL

database server.

MySQL provides connectors for a variety of languages, including

PHP Extension

In the PHP documentation you will come across another term -

Extension. The PHP code consists of a core, with optional extensions

to the core functionality.

PHP's MySQL-related extensions, such as the mysqli extension,

and the mysql extension, are implemented using the PHP

extension framework.

An extension typically exposes an API to the PHP programmer, to

allow its facilities to be used programmatically. However, some

extensions which use the PHP extension framework do not expose an

API to the PHP programmer.

The PDO MySQL driver extension, for example, does not expose an

API to the PHP programmer, but provides an interface to the PDO

layer above it.

The terms API and extension should not be taken to mean the same

thing, as an extension may not necessarily expose an API to the

programmer.

Main PHP API Offerings For MySQL

There are three main API options when considering connecting to a

MySQL database server:

PHP's MySQL Extension

PHP's mysqli Extension

PHP Data Objects (PDO)

PHP's MySQL Extension

This is the Original Extension designed to allow you to develop PHP

applications that interact with a MySQL database.

The mysql extension provides a procedural interface and is intended

for use only with MySQL versions older than 4.1.3.

This extension can be used with versions of MySQL 4.1.3 or newer,

but not all of the latest MySQL server features will be available.

This Is Old Technology!:

The majority of references on the Internet demonstrate how to use

the MySQL Extension.

If you are using MySQL versions 4.1.3 or later it is strongly

recommended that you use the mysqli extension instead. YES

The MySQL Extension is being phased out!

The mysql extension source code is located in the PHP extension

directory ext/mysql.

PHP's mysqli Extension – 1

The mysqli extension, or as it is sometimes known, the MySQL

improved extension, was developed to take advantage of new

features found in MySQL systems versions 4.1.3 and newer.

The mysqli extension is included with PHP versions 5 and later.

The mysqli extension has a number of benefits, the key

enhancements over the mysql extension being:

Object-oriented interface

Support for Prepared Statements

Support for Multiple Statements

Support for Transactions

Enhanced debugging capabilities

Embedded server support

PHP's mysqli Extension – 2

If you are using MySQL versions 4.1.3 or later it is strongly

recommended that you use this extension.

As well as the Object-Oriented Interface the extension also provides a

Procedural Interface.

The mysqli extension is built using the PHP extension framework, its

source code is located in the directory ext/mysqli.

PHP Data Objects (PDO)

PHP Data Objects, or PDO, is a database abstraction layer

specifically for PHP applications. PDO provides a consistent API for

your PHP application regardless of the type of database server your

application will connect to.

In theory, if you are using the PDO API, you could switch the

database server you used, from say Firebird to MySQL, and only

need to make minor changes to your PHP code.

While PDO has its advantages, such as a clean, simple, portable API,

its main disadvantage is that it doesn't allow you to use all of the

advanced features that are available in the latest versions of MySQL

server.

For example, PDO does not allow you to use MySQL's support for

Multiple Statements.

PDO is implemented using the PHP extension framework, its source

code is located in the directory ext/pdo.

http://www.php.net/manual/en/class.mysqli.php - 1

Database

Applications

Have Many Connections

Create Folder

C:\InetPub\wwwroot\Secure-Connect

Create Page Connection.php -1-

It is often the case that there might be hundreds of web pages that

access a single database. Passwords change. The database host can

change.

We would like an easy way to be able to change the password only

one time.

Create page Connection.asp – include it hundreds of times! When the

time comes to make a change, do it once. Save In Folder Secure-

Connect!

<?PHP/*================================================================ Connect To MySQL Database ================================================================*/$server ="localhost"; $username="StanfordUser";$password="trinity"; //Use Your Password$database="stanford";

Save a Copy of Student-Display.php in

Folder

C:\InetPub\wwwroot\StudentoDisplay

Call It

TestSecureConnection.php

Modify Page TestSecureConnection.php<?PHP/*================================================================ Connect To MySQL Database ================================================================*/

include_once "../../Secure-Connect/Connection.php";

/*================================================================ Query 2 ================================================================*/$query2 = "SELECT sID, sName, GPA FROM Student";$recSet2 = $con->query($query);

echo "<CENTER><H1> Display Students</H1></CENTER>";echo "<CENTER><H2> Written By Dr. Tom Hicks </H2></CENTER><HR>";

echo "<pre><P>";

/*================================================================ Loop Through Records In Record Set ================================================================*/while($Rec2 = $recSet->fetch_row())

printf("<B>%3d %-15s %4.2f </B> <BR>",$Rec2[0], $Rec2[1], $Rec2[2]);

echo "</h2></pre>";?> 55

Link TestSecureConnection.php

Connection Page Works!

Some PHP

Have Many Queries

Save a Copy of TestSecureConnection.php

in Folder

C:\InetPub\wwwroot\StudentoDisplay

Call It

TestMultipleQueries.php

Make The Link To Main-Menu.php

Change/*================================================================ Query ================================================================*/$query = "SELECT sID, sName, GPA FROM Student";$recSet = $con->query($query);

/*================================================================ Query 2 ================================================================*/

$query2 = "SELECT sID, sName, GPA FROM Student";$recSet2 = $con->query($query2);

Change/*================================================================ Loop Through Records In Record Set ================================================================*/while($Rec = $recSet-> fetch_row())

printf("<B>%3d %-15s %4.2f </B> <BR>", $Rec[0], $Rec[1], $Rec[2]);

/*================================================================ Loop Through Records In Record Set ================================================================*/

while($Rec1 = $recSet2-> fetch_row()) printf("<B>%3d %-15s %4.2f </B> <BR>",

$Rec1[0], $Rec1[1], $Rec1[2]);

Add A Print Statementecho "<pre><p>";/*=============================================================== Loop Through Records In Record Set ================================================================*/

$query1 = "SELECT COUNT(*) AS NoStudents FROM Student";$recSet1 = $con->query($query1);$Rec = $recSet1->fetch_row();

echo "<pre><p>";

print "No Students = " . $Rec[0] . "<p><hr>";

/*=============================================================== Loop Through Records In Record Set ================================================================*/

$query1 = "SELECT COUNT(*) AS NoStudents FROM Student";$recSet1 = $con->query($query1);$Rec = $recSet1->fetch_row();

One Connection - Multiple Queries!

WWW GUI

Can Help You Provide

Nicely Formatted Output

Flyspeed Query

Results Of Query

We Would Like To Do On A Nicely

Formatted Web Page!

Inside Folder C:\inetpub\wwwroot\PHP

Create Folder

Stanford-Student-Apply

Inside Folder Stanford-Student-Apply

Use Expression Web To Create Stanford-

Student-Apply.php

Link The New Page

Configure Your Page Properties

Create The Following With Arial FontUse Your Name

Move Your Cursor Below The Horizontal

Insert A New Table On Your Page

Configure Your Table As Shown Below

You Should Now Have The Start Of Your

Add The The Following Titles To The First

Row Use Arial Font

Select All Of The Cells In Row 1

Right-Mouse Click On One

Select Cell Properties

Configure The Cells:

Dark Blue

Change The Font Color In The First Row To

Insert XX Into Each Cell In Row 2

Select All The Cells In Row 2 &

Configure As Shown Below

Dark Blue

Add The Connection Before The Table

Add Your Query

Add The Connection Before The Table

We Need To Cycle Through Our Records

Each Cycke Will Create One Of These Rows

Add Your Loop

Making Progress

Finish It Up!

Making Progress

92Numerical Values Should Be Right Justified

Right-Justify All Three Numeric Fields

93Numerical Values Should Be Right Justified

Center 1 Character Fields

Nice Format Easier With GUI

Don't Forget To Include A Return On All Pages

Database Systems

CSCI 3343

Dr. Thomas E. HicksComputer Science Department

Trinity University

PHP & MySQL Database -...

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