DATABASE SYSTEM COMPRISING DATABASE ACCESS OBJECT WITH CACHE

摘要

The present invention relates to a database system. In particular, the invention relates to a system for accessing databases, and specifically, but not exclusively relational databases, over a computer network.The database access system comprises a database access object (20), which operates on a client computer that functions as an interface between a database client (10) and a database server (12). The database object receives database queries from the client and returns a response to the queries to the client. Each database access object maintains a cache of data and if the response data is available in the cache provides the response from the cached data. Otherwise, a query is passed to the database server to retrieve data to make a response. Upon a change in the data cached in the client, the client sends a message to other like database access objects to indicate to the other database access objects the extent to which the data in their caches is invalid.