Triggers & Stored Procedures: Mistakes
Module: Schema Design & Advanced DDL
Putting complex business logic in triggers
Keep triggers simple, put business logic in application code
Triggers hide behavior. Complex logic is hard to debug and maintain. Use triggers only for simple automation. Put business logic in application where it's visible and testable.
High
graph LR
A[Complex Logic] --> B{Where?}
B -->|Trigger| C[Hidden, hard to debug]
B -->|Application| D[Visible, easy to test]
style C fill:#FFB6C6
style D fill:#90EE90
Cascading triggers that fire other triggers
Avoid trigger chains, use single trigger or application logic
Trigger A fires trigger B fires trigger C. Performance multiplies. Debugging nightmare. Solution: Use single trigger or move logic to application.
Critical
No error handling in triggers
Add error handling, log failures, provide clear error messages
Trigger fails → entire transaction rolls back. No error message. Hard to debug. Solution: Add EXCEPTION handling, log errors.
Medium