1. Web Systems Development (CSC-215)
Lecture 7: Working with Databases

2. localhost/phpMyAdmin

3. phpMyAdmin on Remote Host

4. Set up sample database

5. Set up sample database

6. Add sample entry

7. Confirmation of entry

8. Confirmation of entry

9. Process Connect to MySQL Select the database to use
Build a query string
Perform the query
Retrieve results and output to a web page
Repeat 3-5 until all desired data has been retrieved
Disconnect from MySQL

10. Standard (Deprecated) vs. MySQLi
If you’re looking up tutorials, make sure to use MySQLi as covered in the lecture
The textbook includes deprecated version of the same code as well for reference

11. Creating a Login File

12. Connecting to MySQL Server

13. Building and executing a query

14. Fetch Result

16. fetch_array() Can return 3 types of arrays MYSQLI_NUM MYSQLI_ASSOC
Numeric, columns appear in the array in the order defined in the table
MYSQLI_ASSOC
Associative, each key refers to a column (by name)
MYSQLI_BOTH
Associative and numeric array

17. Example

18. Make connection

19. Deleting a record

20. Inserting a record

21. Create input form

22. Get all entries

23. Display all entries

24. Close

25. Sanitize

26. End of example

27. SQL Injection
User verification code

28. Preventing SQL Injection
Normal usage

29. Preventing SQL Injection
Entry for user field

30. Deletion Example

31. PHP’s Magic Quotes Feature
Automatically adds back slash to characters like single and double quotes
Bypass and use mysql_real_escape_string()

32. Solution
Disable special characters by prepending slashes using real_escape_string()

33. Preventing HTML Injection
Example of maliciously inserted code, via, e.g., a form that displays its input
XSS: Cross-Site Scripting

34. Use htmlentities() to convert

35. Embedding PHP in HTML

36. Document head

37. Setting up table

38. Set up calculation

39. Class Activity
Set up a script that is similar to the Fibonacci one but instead of Fibonacci numbers, calculate the sum to n for each number
S0 = 0
S1 = = 1
S2 = = 3
S4 = = 6
S5 = = 10
Print only two columns, Sn and the sum
Set different colors for alternating rows

40. Lecture content adapted from chapter 10 of Learning PHP, MySQL, JavaScript, CSS & HTML5.