协同CAD系统中图档数据管理研究

Research on management for drawing database in collaborative CAD system

为解决计算机辅助协同设计中数据量大、事务长、多层嵌套等问题,提出一种面向对象管理图档数据的新方案.以图形元素为对象构建图档数据存储结构和查询结构;阐述了多版本图档管理模式,该模式能清楚记载版本演变历程,准确实现多版本的回溯;分析了并发控制机制中事务结构、事务提交、锁机制和冲突协调等关键性问题.实例证明:该方法使CAD技术与CSCW技术充分结合,提高了设计过程中图档数据的准确性和一致性.

To resolve problems of too much data, length affair, nesting multiplayer, a new query of managing drawing database was presented. A store and query structure of drawing database based on object - oriented database was established. Managing mode based on many edition of drawing database is expounded, it recorded expressly the course of edition and backdate correctly for many edition. Some key techniques were discussed such as nested transaction, transaction submitting, precautionary locking and conflict resolving. Examples showed： tight joining of CAD application with CSCW platform and being easier to maintain the consistency and integrity of design database. The veracity and the consistency for drawing database in course of design was improved.