Constraint Validation in MVC Applications

Where to perform validations

Integrity constraints should be defined in the model classes of an MVC application since they’re part of the business semantics of a model class (representing a business object type). However, a more difficult question is where thedata validation should be performed. It can be performed in the database, the model classes, the controller, the user interface, or in all of them.

A relational database management system (DBMS) performs data validation whenever there’s an attempt to change data in the database, provided that all relevant ...