我的数据库课程设计，模拟的湘潭市公交管理系统。用PB做的。总体上感觉一般般，唯一満意的是实现了任意两点之间的最少转车次数的查询。-database curriculum design, simulation of Xiangtan City transit management system. Using PB do. On the whole, as the general feeling, the only satisfaction is intended to achieve an arbitrary 2:00 interchange between the minimum number of inquiries.