The document discusses various aspects of building modules for Drupal including preparing for development by establishing coding standards and development workflows. It covers Drupal's extensibility through hooks and APIs available for modules. Key aspects of module anatomy like .info, .module and .install files are outlined. The document also provides an overview of Drupal's database abstraction layer and functions like db_query() and db_fetch_object. Finally, it summarizes the hook system and theme registry for implementing themable functions and templates in modules.

1. Drupal Training
Module Building

2. Preparing for
Development

3. Preparing for
Development
• Have a clear development workflow

4. Preparing for
Development
• Have a clear development workflow
• Learn (and adopt) Drupal’s coding
standards

5. Preparing for
Development
• Have a clear development workflow
• Learn (and adopt) Drupal’s coding
standards
• Take time to invest in your tools

6. Drupal’s Extenisbility

7. Drupal’s Extenisbility
• Drupal’s goal is “infinite extensibility” - this
is what Drupal is generally optimizing for

8. Drupal’s Extenisbility
• Drupal’s goal is “infinite extensibility” - this
is what Drupal is generally optimizing for
• The same APIs that define Drupal’s core
functionality are available to you as a
module developer

9. Drupal’s Extenisbility
• Drupal’s goal is “infinite extensibility” - this
is what Drupal is generally optimizing for
• The same APIs that define Drupal’s core
functionality are available to you as a
module developer
• The hook system!

10. The Anatomy of a
Module

11. The Anatomy of a
Module
• my_module.info

12. The Anatomy of a
Module
• my_module.info
• my_module.module

13. The Anatomy of a
Module
• my_module.info
• my_module.module
• my_module.install

14. Database Abstraction
Layer

15. Database Abstraction
Layer
• Drupal provides a procedural wrapper to
provide support for multiple types of
databases (essentially MySQL and
PostgreSQL)

16. Database Abstraction
Layer
• Drupal provides a procedural wrapper to
provide support for multiple types of
databases (essentially MySQL and
PostgreSQL)
• A thin (and somewhat outdated) wrapper
around the underlying SQL

17. Database Abstraction
Layer
• Drupal provides a procedural wrapper to
provide support for multiple types of
databases (essentially MySQL and
PostgreSQL)
• A thin (and somewhat outdated) wrapper
around the underlying SQL
• On it’s way out (Drupal 7 introduces a new
db layer based on PDO)

18. db_query()

19. db_query()
• run a basic query in the active database

20. db_query()
• run a basic query in the active database
• any number of arguments are substituted
into the query using printf() syntax.

21. db_fetch_result()

22. db_fetch_result()
• Return an individual result (not row) from
the previous query

23. db_fetch_result()
• Return an individual result (not row) from
the previous query

24. db_fetch_object
db_fetch_array

25. db_fetch_object
db_fetch_array
• db_fetch_object() and db_fetch_array()
fetch a row from the previous query as an
object or array, respectively

26. db_fetch_object
db_fetch_array
• db_fetch_object() and db_fetch_array()
fetch a row from the previous query as an
object or array, respectively

27. drupal_write_record()

28. drupal_write_record()
• Write or update a record in the database
based upon the schema starting with an
object or array

29. drupal_write_record()
• Write or update a record in the database
based upon the schema starting with an
object or array

30. The Hook System

31. The Hook System
• both core and contrib provide a set of
“hooks” that your module can implement
to add functionality to existing operations

32. The Hook System
• both core and contrib provide a set of
“hooks” that your module can implement
to add functionality to existing operations
• your module registers to be notified of a
particular operation by implementing a
hook

33. The Hook System
• sample hook:
• sample implementation:
• called by:

34. The Anatomy of the
php template engine

35. The Anatomy of the
php template engine
• Files

36. The Anatomy of the
php template engine
• Files
• .info

37. The Anatomy of the
php template engine
• Files
• .info
• .template

38. The Anatomy of the
php template engine
• Files
• .info
• .template
• .tpl.php

39. The Anatomy of the
php template engine
• Files
• .info
• .template
• .tpl.php
• javascript/css/images

40. Anatomy cont.

41. Theme Registry

42. Theme Registry
• modules must implement hook_theme to
declare their themable functions and
templates

43. Theme Registry
• modules must implement hook_theme to
declare their themable functions and
templates
• these functions must be titled
theme_function_name

44. Theme Registry
• modules must implement hook_theme to
declare their themable functions and
templates
• these functions must be titled
theme_function_name
• theme(‘function_name’, $param) is then
used to call the function

45. Implementing
hook_theme()

46. Providing a default
theme function

47. Providing a default
template