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In the ever-evolving world of software development, architects and developers strive to create scalable, maintainable, and robust applications. One of the key principles that aid in achieving these goals is the proper organization of data access and storage. The Repository Pattern is a fundamental architectural design pattern that provides a structured approach to handling data, making it an invaluable tool for developers. In this article, we will delve into what the Repository Pattern is, how it should be implemented, and provide some real-world examples of its application.

The Criteria Pattern stands as a powerful tool, often hidden in the shadows of more commonly discussed design patterns. This pattern empowers developers to implement dynamic and customizable queries in their applications, enhancing flexibility and maintainability To facilitate this process, Criteria package provides the shared domain logic that contains abstract criteria implementation that each specific criteria should extend from.

MongoDB is a popular open source and document oriented database system. It belongs to a family of databases called NoSQL, which is different from the traditional table based SQL databases. It makes use of collections, each having multiple documents, and allows the user to store data in a non relational format. Data is stored in flexible, JSON-like documents where fields can vary from document to document. That's the reason for calling it schemaless database.