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This article mainly introduces MySQL trigger can do what to use, the article is very detailed, has a certain reference value, interested friends must read!

MySQL triggers are used to track user operations on the database, implement complex non-standard database integrity rules, synchronize real-time replication of data in tables, and automatically calculate data values.

trigger

A trigger is a special stored procedure that executes automatically when an attempt is made to change the data protected by the trigger.

The function of trigger

Security, which allows users to have certain rights to operate the database based on its values.

Audit, which can track user operations on the database.

Implement complex non-standard database integrity rules, triggers can update related tables in the database in a chain.

Triggers can reject or roll back changes that break correlation integrity and cancel transactions that attempt data updates. This trigger works when an external key is inserted that does not match its home key.

5, synchronous real-time replication of the data in the table

6, automatically calculate the data value, if the data value reaches a certain requirement, then carry out specific processing.

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