This is the part III of the Drupal Database Abstraction Layer

In part I of the database series we saw how to

1. Creating and deleting the tables when a module is installed or uninstalled.

2. Updating the table structure once the module is in use. So the users can apply a patch easily

In Part II we visited 

1. Ways to write secure database calls that can eliminate SQL injection

2. Reading from the database and iterating over results

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