The invention relates to a database middleware system which is connected with an external database. The database middleware system comprises a data processing communication component, a database processing component and an information management component, wherein the data processing communication component provides an application program interface for an external application program component soas to load a middleware system, and dispatches and manages the database middleware system to communicate with the external application pogram component through the msip protocol, thereby realizing communication between the external application program component and the external database; the database processing component comprises a shared database linking module and a database operation monitor module, and is used for detecting whether the link between the database middleware system and the external database is valid, and the shared database linking module communicates with the external database; and the information management component comprises a serve manager module, and is used for setting different processing priorities for different tasks, coordinating with the data processing communication component and the database processing component, and dynamically dispatching the tasks according to the set processing priorities and the relationship between the tasks and the positioned network environments.