Xml Technology In Heterogeneous Multi-database Query

With the rapid development of computer network and database, more and more enterprises use distributed heterogeneous databases to manage the affairs, so exchanging and sharing data stored in heterogeneous databases distributed in different location is becoming a crucial issue.Normally heterogeneous databases are accessed by well designed application programs. Therefore when the data related with a querying plan are stored in various types of databases, different application programs may be designed to access those databases by programmer. It makes enormous waste of resources. The heterogeneous databases querying model based on XML. program auto-generation technology and component technology gives programmers an idea to solve problem and allows them to avoid programming many repetitive codes. With support of this system data access and share can be implemented more rationally and efficiently.