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