mysql> select md5(now());
+----------------------------------+
| md5(now())                       |
+----------------------------------+
| c7a6499e248f57b02d407d0e6a188b52 |
+----------------------------------+
1 row in set (0.00 sec)mysql> select md5(now());
+----------------------------------+
| md5(now())                       |
+----------------------------------+
| 29c6c158d56f2dc9970747594fe663bd |
+----------------------------------+
1 row in set (0.00 sec)mysql>
呵呵,这个可以么?