Session 7: Getting PHP to Talk to MySQL

Objectives

Connecting to the Database Building & Executing the SQL SELECT Query Fetching & Displaying the data Using PEAR

The Process

Connect to the database Select the database to use Build a SELECT statement Perform the query Display the result

Including Database Login Details

Connecting to the Database

Selecting the Database

All mysql related functions have an optional parameter – the database connection. If you don’t specify the connection, the connection is the latest result of calling mysql_connect

Building the SQL SELECT Query

Use a variable named $query to store the SQL Statement

Build up a query in parts using the string concatenation (.) operator

Executing the Query

Using the mysql_query() function The results form a result set. Each element corresponds to a row. To display them, process each row, one at a time

Fetching and Displaying

Use mysql_fetch_row() function to get the rows from the result set

The function returns one row at a time until there are no more rows. If there are no more rows, it return FALSE. Thus, use a loop to fetch and display the result set.

Fetching and Displaying (cont.)

Use mysql_fetch_array() function First parameter: the result set Second parameter (optional)

MYSQL_ASSOC, array is indexed based on columns’s names MYSQL_NUM, array is index based on number starting at zero MYSQL_BOTH, both types above

Fetching and Displaying (cont.)

Use mysql_fetch_assoc() function

Closing Connection

Close the connection when finishing Closing the connection will free any resources and memory allocated to

it by MySQL and PHP Syntax: mysql_close($connection)

Using PEAR

PEAR is a framework and distribution system for reusable PHP components

There are many modules which is categorized

Installing PEAR

Go to the command line window Go to the path C:\php Type go-pear.bat At the first question, type local Confirm by typing yes

Installing PEAR (cont.)

At the next question, type all

Installing PEAR (cont.)

Answer 12 question as following

Installing PEAR (cont.)

Then Enter At the altering php.ini question, type Y Then Enter And finish installing of PEAR

Adding Additional Package

Access PEAR Package Manager by entering pear at the command prompt

Adding new modules: pear install package_name

Using PEAR DB

Include the PEAR DB package

Create a connection

Connect string

Dbtype: dbase, msql, mssql, mysql, mysqli, oci8, odbc, pgsql, … Querying

Fetching

Using PEAR DB (cont.)

Closing PEAR error reporting

Practice Develop an Image Collection System with following

functions User Module

Register a new user Change password Edit user profile Logon/logout

Album Module Create a new, empty album Upload images to the album Delete images of an album Sort images based on size, name, date of upload View album

Task: Design the database structure Create the database with MySQL