mysql dumpfile 与 outfile 函数的区别

在windows下验一下这两个函数的区别

 

ubuntu下不成功，权限出错

mysql> select * from demo;

+-------------+--------------+

| first_field | second_field |

+-------------+--------------+

| ab          |            2 |

| abc         |            3 |

+-------------+--------------+

2 rows in set (0.00 sec)



mysql> select * from demo into outfile '/home/vigar/tst/aaa';

ERROR 1 (HY000): Can't create/write to file '/home/vigar/tst/aaa' (Errcode: 13)

mysql> create table a (cmd LONGBLOB);

Query OK, 0 rows affected (0.14 sec)



mysql> select * from a;

Empty set (0.00 sec)



mysql> insert into a (cmd) values (hex(load_file('/usr/bin/zip')));

Query OK, 1 row affected (0.00 sec)



mysql> select * from a;

+------+

| cmd  |

+------+

| NULL |

+------+

1 row in set (0.00 sec)



mysql> select unhex(cmd) from a into dumpfile './aaa';

Query OK, 1 row affected (0.00 sec)
但没有找到aaa的具体位置