Research and realization of access control methods for class-oriented and object-oriented

Through building PDM managerial classes' model, authorization management is organized based on PDM system's function modules. Inheritance methods of PDM managerial classes and the operations assign modes of PDM managerial classes are discussed. Access control model is organized. Through discussing the relationship of mutually tables in database, rules of access authorization control is analyzed. Class-oriented access control and object-oriented access control are realized, and mult-authorization setting for a class data and a instance are completed. The flow chart of roles assignment, the flow chart of the user's activities in PDM system and the flow chart of authorization validation are given. The methods of authorization setting are simple and criterion, and the operational efficiency of PDM system is improved.