Working_Harder的专栏

(1). java编程的日期，年月日，月竟然从0开始算起，年和日从1开始算 (2). mysql ResultSet rs rs.getInt(1);<==>rs.getInt(“id”); 下标从1开始；jdbc中select * from user where id=? ; ps.setString(1,12); 设置参数同样是从下标1开始的(3). 但是hibernate设置设置参数 lis

mysql 的 级联删除与级联更新  create table student( id int, departmentId int, foreign key(departmentId) references department(departmentId) on delete cascade ; ); 级联更新(如:某次需要更新了 department表的某一个id 号