𝗛𝗼𝘄 𝘁𝗼 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗰𝗮𝗹𝗹𝘆 𝗨𝗽𝗱𝗮𝘁𝗲 𝗦𝗽𝗲𝗻𝘁 𝗔𝗺𝗼𝘂𝗻𝘁 𝗶𝗻 𝗕𝘂𝗱𝗴𝗲𝘁 𝗨𝘀𝗶𝗻𝗴 𝗧𝗿𝗶𝗴𝗴𝗲𝗿𝘀 𝗶𝗻 𝗦𝗤𝗟 𝗦𝗲𝗿𝘃𝗲𝗿

𝗪𝗵𝗮𝘁’𝘀 𝗮 𝗧𝗿𝗶𝗴𝗴𝗲𝗿?

A trigger is an automatic action in the database when a specific event occurs (e.g., after an insert or update).

𝗪𝗵𝘆 𝗨𝘀𝗲 𝗮 𝗧𝗿𝗶𝗴𝗴𝗲𝗿 𝗳𝗼𝗿 𝗕𝘂𝗱𝗴𝗲𝘁 𝗧𝗿𝗮𝗰𝗸𝗶𝗻𝗴?

To ensure the 𝗦𝗽𝗲𝗻𝘁𝗔𝗺𝗼𝘂𝗻𝘁 in the budget table updates automatically when an expense is added or updated.

𝗧𝗿𝗶𝗴𝗴𝗲𝗿 𝗼𝗻 𝗜𝗻𝘀𝗲𝗿𝘁:

When an expense is added, a trigger calculates the total spent amount for a user in a specific month and updates the budget.

𝗧𝗿𝗶𝗴𝗴𝗲𝗿 𝗼𝗻 𝗨𝗽𝗱𝗮𝘁𝗲:

When an expense is updated, the trigger subtracts the old amount and adds the new amount to the budget’s 𝗦𝗽𝗲𝗻𝘁𝗔𝗺𝗼𝘂𝗻𝘁.

𝗔𝗹𝗲𝗿𝘁 𝗼𝗻 𝗘𝘅𝗰𝗲𝗲𝗱𝗶𝗻𝗴 𝗕𝘂𝗱𝗴𝗲𝘁:

If the updated 𝗦𝗽𝗲𝗻𝘁𝗔𝗺𝗼𝘂𝗻𝘁 exceeds the monthly limit, an alert is raised to warn the user.

𝗦𝗤𝗟 𝗦𝘆𝗻𝘁𝗮𝘅 𝗳𝗼𝗿 𝗧𝗿𝗶𝗴𝗴𝗲𝗿𝘀:

Triggers use SQL syntax like AFTER INSERT, AFTER UPDATE, and RAISEERROR to handle automatic updates and alerts.

𝗥𝗲𝗮𝗹-𝗪𝗼𝗿𝗹𝗱 𝗨𝘀𝗲 𝗖𝗮𝘀𝗲:

This is especially useful in 𝗲𝘅𝗽𝗲𝗻𝘀𝗲 𝗺𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 to track and control monthly spending.

𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗘𝗙 𝗖𝗼𝗿𝗲:

Triggers can be added in the migration files when using 𝗘𝗙 𝗖𝗼𝗿𝗲 in your application.

𝗣𝗼𝘁𝗲𝗻𝘁𝗶𝗮𝗹 𝗜𝘀𝘀𝘂𝗲𝘀:

Always ensure triggers are properly tested to avoid unexpected updates or errors in your data.

𝗔𝘂𝗱𝗶𝗲𝗻𝗰𝗲 𝗤𝘂𝗲𝘀𝘁𝗶𝗼𝗻:

𝗛𝗼𝘄 𝗱𝗼 𝘆𝗼𝘂 𝗺𝗮𝗻𝗮𝗴𝗲 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗰 𝘂𝗽𝗱𝗮𝘁𝗲𝘀 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗱𝗮𝘁𝗮𝗯𝗮𝘀𝗲? 𝗗𝗼 𝘆𝗼𝘂 𝘂𝘀𝗲 𝘁𝗿𝗶𝗴𝗴𝗲𝗿𝘀, 𝗼𝗿 𝗶𝘀 𝘁𝗵𝗲𝗿𝗲 𝗮𝗻𝗼𝘁𝗵𝗲𝗿 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻 𝘆𝗼𝘂 𝗽𝗿𝗲𝗳𝗲𝗿? 𝗟𝗲𝘁’𝘀 𝗱𝗶𝘀𝗰𝘂𝘀𝘀!