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mysql> select @@datadir;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 27
Current database: test
+-----------------------------------------------+
| @@datadir |
+-----------------------------------------------+
| C:\Program Files\MySQL\MySQL Server 5.1\DATA\ |
+-----------------------------------------------+
1 row in set (0.30 sec)
mysql>
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修改路径后 ，重启Mysql服务即可