摘要:
对于- (void)setValue:(id)value forKey:(NSString *)key;函数 官方解释如下Send -setObject:forKey: to the receiver, unless the value is nil, in which case send -rem... 阅读全文
posted @ 2015-05-06 17:01
Stephen Li
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闪回查询查看当前数据库中的3个参数,其中UNDO_MANAGEMENT:指定回滚段的管理方式,如果设置为AUTO。则采用撤销表空间自动管理回滚信息UNDO_TABLESPACE:指定用于回滚信息自动管理的撤销表空间名UNDO_RETENTION:指定回滚信息的最长保留时间//查询参数SQL> show parameter undo;NAME TYPE VALUE------------------------------------ ----------- -----------------------------u... 阅读全文
posted @ 2013-05-15 15:08
Stephen Li
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2468 Counting LettersAs a talented student, your boss gave you a task. Given a text string, you should find out which letters appear most frequently.Really simple, isn't it?InputThe first line of the input is the number of test cases. Then some test cases followed.Each test cas... 阅读全文
posted @ 2012-08-27 20:49
Stephen Li
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