Study On Integrated Mode Of Heterogeneous Database Based On XML

Because of the reason of history, a large amount of various different database that constructed exist on the network, in a lot of respects, there are several the following respects mainly in their different constructing nature behavior: 1) The constructing differently of system structure of the computer, each database is running in the mainframe, The microcomputer is, in work station, PC or embedded system; 2) The constructing differently of basic operating system, the basic operating system of each database system can be Unix, Windows NT, Linux.etc.; 3)The constructing differently of DMBS itself can be all oracle of the database system of relation type, SQL Server,etc., It can be a database of different data models too, such as relation, mode, level, network, target of facing, The database of function type; 4)The structure of the data and sometime are constructed differently, each different databases are used and adopt different data structure and sometime expression way systematically. With the constant development of the enterprise information system, more and more users need a lot of different data which construct the database visiting and deal with different network nodes at the same time, Hope shielding No. Each different to construct characteristic, they know physics database the distributions of systems, Know physics the structures of databases form, oneself needn't go and carry on data change and gather with the result, Only need to inquire about and can receive a result of synthesizing through simple and convenient the overall situation. So, need a kind of new systematic frame to solve a lot of different information sharing of constructing the database, the prerequisite must be transparent to the user, and keep the autonomy quality of the local database. This text compared present various kinds of integrated schemes, put forward a kind of integrated model based on XML at last.This text carries on extensive investigation and analysis to traditional data integration at first, Discussing XML technology and comparing with database in detail. Propose each different to construct database information sharing model, this model make translator, integrating machine and switching device, Through the translator issues the relation data as XML file, then offer different XML overall view which constructs the relation database through integrating machine and switching device, Allowing the outside user to visit or use XML and inquires these views directly. This model translates the data to XML according to the mapping rules. Then the model mainly has three parts: the first, Discussion database mode and mapping mechanism and define XML mapping language standard by IDB between the DTD; Second, Establishing XML overall view after designing three package translators, And package manage the overall view machine who manages view; The third, The programming interface offering Xpath and Xquery, support the user to inquire about XML overall view. In addition, one when adopted Java and developed, can be used for structuring the different information-sharing platform, which constructs the databaseconveniently.