The functions of MySQL triggers are: 1. Giving users certain rights to operate the database; 2. Tracking user operations on the database; 3. Continuously updating related tables in the database; 4. Copying data in the table in real time Data; 5. Automatically calculate data values.
Triggers
A trigger is a special stored procedure that automatically executes when an attempt is made to change the data protected by the trigger.
The role of triggers:
1. Security, it can give users certain rights to operate the database based on the value of the database.
2. Auditing can track user operations on the database.
3. Implement complex non-standard database-related integrity rules, and triggers can perform serial updates to related tables in the database.
4. Triggers can reject or roll back changes that destroy related integrity and cancel transactions that attempt to update data. This trigger works when a foreign key is inserted that does not match its primary key.
5. Copy the data in the table synchronously and in real time.
6. Automatically calculate the data value. If the data value reaches certain requirements, specific processing will be performed.
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