Flash Camp Chennai - Social network with ORM
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The document discusses Object-Relational Mapping (ORM) and how it can be used to develop a social networking application. It introduces ORM and explains that it maps objects to relational databases. It then discusses why ORM is useful, allowing for an object-oriented approach. It also covers how to use ORM with a dependency injection framework and generic Data Access Objects. Finally, it provides an example of how ORM could be implemented in a social networking application using value objects like Persons and Connections between them.
Flash Camp Chennai - Social network with ORM
- 1. Developing Social Network using ORM By N.S.Devaraj
- 3. Agenda ORM Introduction Why ORM ? How to use ORM ? Why Generic DAO / Persistent Collections ? Social Networking Application Demo Questions ?
- 5. OMG WTF ORM ?
- 6. Object-Relational Mapping maps objects to relational databases maps relational databases to objects a programming technique for converting data between incompatible type systems in object-oriented programming languages - WikiPedia
- 7. Why ORM ? Full on Objects of objects Less DB Work The ORM World Beans Not much else Procedural Object-Oriented Classic Procedural with DAO’s More DB Work
- 8. How to use ORM ORM have to allow the DB swap "on the fly" to achieve, we need DI / IoC framework (Swiz) a GenericDAO to be created to manage Business Logic a Persistent Data collection to reduce server calls supported with a Push Mechanism to be Sync with Data Source & for Conflict Management
- 9. Data Access Object DAO is used to Each DAO do CRUD instance is operations and responsible for access with one primary Database tables, domain object used to achieve or entity. encapsulation an object that provides an abstract interface to some types of database or persistence mechanism. - WikiPedia
- 10. Why we need GenericDAO? Mostly we With deal with GenericDAO, Unit testing multiple VO’s Using MVC Framework, while dealing with the business is damn easy to be queried n x VO, we end up with logic will be as we can from service in generic inject values layer. code. nx nx n x Events Delegates Commands
- 11. Advantages Increases productivity Apply DRY (Don’t Repeat Yourself) Principle Reduces errors Easy for Unit Testing
- 12. Server DAO Model Abstract Real World Example Data Source SQL Table: Notes Create, Read, Update, Delete Perform SQL Queries Data Access Object Notes DAO creates Maps SQL Records to Delegates CRUD Operations to Delegates CRUD Operations to Value Object NoteVO Business Object Library Service calls receives Communicates with receives Client Flex RIA
- 13. Client DAO Model Abstract Real World Example Push Push Business Object Delegate Update Notes Beans Delegate Update Create, Read, Update, Delete Perform functions creates PC DAO PC Generic DAO Service Results to Delegates CRUD Operations to Delegates CRUD Operations to VO NoteVO Events Signals dispatches receives dispatches receives View Skinnable Component
- 15. Social Network App Value Objects Required Persons Notes(updates) Connections – files, replies
- 16. DEMO
- 17. Questions ?
- 18. Thanks For Twitter @nsdevaraj GTalk nsdevaraj Blog http://nsdevaraj.wordpress.com Code https://github.com/nsdevaraj/SwizDAO Web http://www.adamstudio.in