动态修改数据窗口的Where子句，用到pfc,（pb9+oracle)测试通过，非常好用，简单。-dynamic modification of the data window Where clause, which used PFC, (pb9 oracle) test, a very convenient, simple.

一个小型的图书管理系统，对初学PB9.0的帮助很大。-A small library management system, help beginners PB9.0.