Research and Implementation of Distributed Data Access Middleware

Main functions of data access middleware are location transparency, distributed data query, transaction process and heterogeneous data sources compatibility. This paper centralizes on the realization of the data access middle software of enterprise application and studies the base services of distributed application of Microsoft DCOM/COM+. With sample of distributed data management system of enterprise introduces application and characteristic of distributed data access middleware. The distributed data access middleware may meet the needs of distributed data query and distributed calculation of enterprise.