In this paper, we proposed a formal security database system access model including a multilevel relation model and a element-level authorization.

提出了一个安全数据库访问控制模型，包括一个多层关系模型和一个用以增强自主访问控制能力的元素级粒度的授权。

youdao

In this paper, we proposed a formal security database system access model including a multilevel relation model and a element-level authorization.

提出了一个安全数据库访问控制模型，包括一个多层关系模型和一个用以增强自主访问控制能力的元素级粒度的授权。

youdao