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Don Burleson Blog 







VPD还有其他几个名称,包括行级安全性(Row-level security,RLS)和高精度访问控制(Fine-grained access control,FGAC)。不管采用什么名称,VPD都提供了访问Oracle数据的一种全新方式。


  • Oracle调用策略函数,它返回一个谓词(predicate)。谓词是一个WHERE子句,它对表中的一个特定的行集合进行限定。
  • Oracle动态重写查询,方法是将谓词追加到用户的SQL语句之后。





SELECT * FROM scott.emp WHERE P1


  • 动态安全性不需要维护复杂的角色和授予
  • 多种安全性为每个对象设置多个策略,并将它们堆叠在其他基本策略之上
  • Web应用程序由于是单个用户访问数据库,所以行级安全性很容易在不同的用户之间加以区分
  • 没有后门用户不能绕过嵌入应用程序的安全策略,因为安全策略已经附加到数据上



本文为ZDNet China版权所有,未经许可严禁转载。



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