auto-triggerTrigger is an implicit stored procedure that automatically triggers execution when a specific event (such as insert, update, delete operation) occurs in the database. It is mainly used for data integrity control, business rule enforcement, audit tracking, and other scenarios.

　　auto-triggerIt is a special stored procedure that is implicitly executed and associated with a specific table or view. When a specified event occurs on a table or view (such as data modification operations like INSERT, UPDATE, DELETE, etc.), the trigger will automatically trigger and execute the code defined within it.

The function of automatic trigger:

Allow/restrict modifications to tables: Through triggers, complex conditions can be defined to allow or prevent modifications to tables. For example, a trigger can be created to prevent non administrator users from updating data in a specific table.

Automatic derived columns: triggers can be used to automatically calculate and update certain column values in a table. For example, a trigger can be created to automatically set a timestamp or calculate the derived value of a field when inserting a new record.

Enforce data consistency: triggers can ensure that data modification operations comply with business rules or data integrity constraints. For example, a trigger can be created to ensure that the value of a field always stays within a specific range.

Provide auditing and logging: triggers can be used to record modifications to tables for auditing or tracking data change history. This is very useful for meeting compliance requirements or troubleshooting.

Prevent invalid transaction processing: triggers can check the validity of data modification operations and roll back transactions when invalid operations are found, ensuring data integrity and consistency.

Initiate complex business logic: triggers can call other stored procedures or execute complex business logic in response to data modification operations.