PURPOSE: To provide the object-orientation data base system and version managing method reducing memory waste and the reduction of efficiency for executing the procedure of user definition.
CONSTITUTION: An attribute to store a pointer to a meta version is defined as an instance parameter, a version-made object class 51 to hold a method for writing and reading values to the attribute is held as a system library 50, and the definition of the object class made to be a version 51 is succeeded by the class of a compile request user. Respective attributes for storing the pointer to a set object having the plural versions of the object as elements, for storing the pointer to the representative version of elements in the set object and for storing the pointer to generic instance are defined as instance parameters, and a meta version class 52 to hold a method for writing and reading values to the respective attributes and a version manager class 53 to hold the version making means of the object as a method are held as the library 50.
Youichi Yamamoto
Masato Asami
Kumiko Furukawa
Kazuhiro Sato
Maruyama Takeo
