摘要
在分析扩展和定制 PDM的特定需求的基础上 ,提出了两种扩展和定制 PDM数据对象的方法 。
We discuss two main kinds of data expanding method, which meets different requirements, in detail. These methods are: (1) extending object classusing the concept of object class inheritance, we can derive sub class from the parent class. By adding new attributes and registering more message processing methods to an existing class, the function of the PDM product data can be strengthened; (2) customizing object typewith the aid of projection and joining on the basis of the fundamental table in RDBMS, we can get the sub types database views from the primary object types. Two kins of projection methods—vertical projection and horizontal projectioncan be adopted according to different needs. Two specific kinds of joining ——self joining and outer joining ——are also discussed. Adopting the above principle, the authors have successfully achieved the extending and customizing the product data object in a preliminary PDM prototype —863/CIMS Xi'an Aircraft Corporation Automatic Part List Management System.
出处
《机械科学与技术》
EI
CSCD
北大核心
2000年第4期668-670,共3页
Mechanical Science and Technology for Aerospace Engineering
基金
86 3/ CIM S基金资助! ( 86 3- 511- 96 0 1- H30 1)
