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1原创 ConcurrentModificationException
增强for循环进行remove操作LinkedList<String> roomList = new LinkedList<>(Arrays.asList("1","2","3"));for (String rl : roomList) {roomList.remove(rl);}for循环本质Integer i;for(Iterator iterator = list.iterator(); iterator.hasNext(); Sy...
2021-09-07 15:14:37
104
原创 Error Code: 1005. Can't create table '…' (errno: 150)
外键约束导致问题，原语句：foreign key (dept_name) references department on delete set null改为：foreign key (dept_name) references department(dept_name) on delete set null 竟然通过了，也就是说即使外键名称与原主键名称相同，也要注明，不可省略。
2017-04-11 15:33:17
400
转载 ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) 解决方法
直接改root密码吧。http://www.cnblogs.com/allenblogs/archive/2010/08/12/1798247.html如果遇到ERROR 1054 (42S22): Unknown column 'Password' in 'field list'问题，看下面链接。http://blog.csdn.net/u010603691/article/deta
2017-03-14 15:22:37
905
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