Based Rdbms Object - Relational Mapping Technology

In CLERA (Modern Enterprise Resource Administrating System of Chunlan), there are various engineering datas. Involuntarily, questions of these engineering datas' management appear,datas' Persistance only depending Relational Model and RDBMS is greatly insufficient, so this paper carefully studies Object-Relational Mapping based on RDBMSBased on the analyse of home&overseas actualities,correlative theories and realizing methods of Object-Relational Mapping, we find OPL based on RDBMS is the most suitable for Object Relatinoal Mapping of CLERA. Based on the engineering application analyse of OPL in CLERA, function requirements , database modes, interface criterions and functions , running modes of OPL have being detailedly described. With the framework of Microsoft DNA, a kind of realizing method of OPL based on COM/DCOM/ActiveX Component technology has being brought forward, and this paper describes realizing keys from base tables' definition, object ID and class HX class and inheritance of class, object storage, parallel control and affair, object query , object nesting, relations between objects , support of complex data types , right control of object and buffer management of object.OPL components have being actually used in the Modern Enterprise Resource Administrating System of Chunlan, adequately supporting efficacious managements of various engineering datas.