Download Session07

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 $query to store the SQL Statement
 Build up a query in parts using the string concatenation (.) operator
Executing the Query
 Using the mysql_query() function
 The results form a result set. Each element corresponds to a row.
 To display them, process each row, one at a time
Fetching and Displaying
 Use mysql_fetch_row() function to get the rows from the result set
 The function returns one row at a time until there are no more rows.
 If there are no more rows, it return FALSE.
 Thus, use a loop to fetch and display the result set.
Fetching and Displaying (cont.)
 Use mysql_fetch_array() function
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First parameter: the result set
Second parameter (optional)
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MYSQL_ASSOC, array is indexed based on columns’s names
MYSQL_NUM, array is index based on number starting at zero
MYSQL_BOTH, both types above
Fetching and Displaying (cont.)
 Use mysql_fetch_assoc() function
Closing Connection
 Close the connection when finishing
 Closing the connection will free any resources and memory allocated to
it by MySQL and PHP
 Syntax: mysql_close($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
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Dbtype: dbase, msql, mssql, mysql, mysqli, oci8, odbc, pgsql, …
 Querying
 Fetching
Using PEAR DB (cont.)
 Closing
 PEAR error reporting
Practice
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Develop an Image Collection System with following
functions
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User Module
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Album Module
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Register a new user
Change password
Edit user profile
Logon/logout
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:
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Design the database structure
Create the database with MySQL