Extending and improving commercial DBMS is an easy and available way to build CAD DBMS. GOODDBMS is a CAD DBMS based on INGRES DBMS, and extends it by add in the concept of object-orientation. An interface is built to connect GOODDBMS and GKS.

• 建造CAD DBMS的一个简便、可行的方法就是扩充和改进商用DBMS,GOODDBMS是一个CAD DBMS,它建立在INGRES之上,利用面向对象的概念对它进行了扩充,同时,还联接了图形系统GKS,实现了图形功能。