Abstract:

The problem of how smart device can efficiently access data stored in relational data base must be solved in the era of mobile Internet. Windows Phone provides a solution. Firstly, an entity data model is constructed based on a corresponding relational database by using ORM technology. Secondly, the object context of the entity data model is encapsulated by a REST WCF Data Service, which is deployed by Windows Azure. Finally, data is queried and handled according to the specification of open data protocol. These technologies are discussed and an example is given by combining MVVM pattern, which proves the solution is feasible. Because smart device can access and manipulate WCF Data Service deployed in Windows Azure through Open Data Protocol and return results by XML, the Windows Phone data access pattern can be extend to other smart device platforms with different operating systems such as Android and IOS.

Key words: Windows Phone;WCF data service;representational state transfer(REST);open data protocol;MVVM(Model-View-View Model) pattern