把“空格”、“:”替换掉,再加两个零
mysql> select DATE_FORMAT('20060507083000','%Y-%m-%d %H:%i:%s');
+---------------------------------------------------+
| DATE_FORMAT('20060507083000','%Y-%m-%d %H:%i:%s') |
+---------------------------------------------------+
| 2006-05-07 08:30:00                               |
+---------------------------------------------------+