HW12: Triggers due Mon 15 Apr 13:00

Allowed and Disallowed Resources

• Examples and sample code found here: https://josephus.hsutx.edu/classes/db/source/
• The SQL handout provided in class and also available here: https://josephus.hsutx.edu/classes/db/source/sql.pdf
• A text editor (or VSCode) that provides syntax highlighting. You MAY NOT USE an extensions to such editors/IDEs that produce code.
• The phpPgAdmin front end to your personal database (login is here: https://csci.hsutx.edu/phpPgAdmin/
• Video instructions provided in Canvas as part of this course. You MAY NOT USE any other video resources.
• Any handouts provided by the instructor as part of this course.
• Your own course notes
• Your instructor
• Discussions about the assignment with other students as long as you never look at the code produced by another student and you never receive instructions about solving the homework. That is, discussions need to be about concepts and understanding the technologies and not about how to solve the particular problem posed in this assignment.

You may NOT use/access:

• Resources not expressly listed above, including, but not limited to, the following ...
• Source code not provided as part of this assignment. (Obviously, this includes, but is not limited to, source code written by other students whether current or in the past).
• Code-generating tools (of which ChatGPT is one example).

Failure to abide by these guidelines will result in a zero for the assignment and the incident will be reported to the university provost as a violation of the university academic integrity policy. A second incident of academic dishonesty (whether from this course or another computer science course) will result in an F in the course.

Description

• Currently your populate_pending_emails function copies entries from the pending_emails table into the sent_emails table and then deletes them from the pending_emails table.

  Modify the behavior of your script so that instead it only deletes entries from the pending_emails table.

• Create a trigger and a trigger function that will be activated when rows are deleted from the pending_emails table. When the trigger function is activated it will perform the insertion (of entries being deleted) into the sent_emails table.

The result is that the logging of sent emails is handled by a trigger rather than embedded in the script.

Grading and Submission