1. PHP-language, database-programming
Jouni Juntunen
Oulu University of Applied Sciences
School of Business and Management Studies

2. Idea of database programming
End users do not use database from management console using SQL-statements
Create UI (web-page, windows form, etc.) for end user and permorm database manipulation in application code (e. g. in PHP-script)

3. Database-programming API (Application programming interface)
Database-driver

4. Basic steps of database programming
Open connection to database-server and Select database
Manipulate data
Close connection

5. Example: Read data from database

6. mysql_fetch_row Structure of the table in database
Data (records) of the table in database
mysql_fetch_row read one record at time and the return value is array containing information of all fields

7. Example: Insert data into database
newMessage.html
save.php

8. Opening connection
Connection to database server must be opened before manipulating data
Check always for error when opening database connections

9. Select database to use Select database to use
Servers may have several different databases

10. Manipulate data Reading information Inserting, updating and deleting
mysql_query containing select sql-statement
mysql_fetch_row inside while loop
Inserting, updating and deleting
mysql_query containing sql-statement that manipulates data

11. Close connection
Connection to database (server) must be always closed after manipulatin data
Open connections consumes resources from server