file权限指的是是否能够对系统的文件读取和写操作.
拥有file权限才可以执行 select ..into outfile和load data infile…操作，
但是不要把file, process, super权限授予管理员以外的账号，这样存在严重的安全隐患。 下面简单做个试验：
1、创建环境
MySQL> CREATE USER 'filetest'@'localhost' IDENTIFIED BY 'mypass';
Query OK, 0 rows affected (0.01 sec)
mysql> GRANT select ON test.* TO 'filetest'@'localhost';
ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT select ON test.* TO 'filetest'@'localhost';
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TABLE tab1(
-> aa varchar(50),
-> bb varchar(50)
-> );
Query OK, 0 rows affected (0.02 sec)
mysql>
mysql> insert into tab1 values('aaa','bbb');
Query OK, 1 row affected (0.01 sec)
mysql> insert into tab1 values('ccc','ddd');
Query OK, 1 row affected (0.01 sec)
mysql>
2、切换到filetest用户：
[root@master ~]# mysql -ufiletest -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.13-log Source distribution
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| test |
+--------------------+
2 rows in set (0.00 sec)
mysql> select * from tab1 into outfile '/mysql/mysql57/st_file1';
ERROR 1045 (28000): Access denied for user 'filetest'@'localhost' (using password: YES)
没有file权限，倒出报错！
3、root登陆授权：
mysql> grant file on test.* to filetest@localhost;
ERROR 1221 (HY000): Incorrect usage of DB GRANT and GLOBAL PRIVILEGES
mysql> grant file on *.* to filetest@localhost;
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
4、filetest用户登陆
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from tab1 into outfile '/mysql/mysql57/st_file';
Query OK, 2 rows affected (0.01 sec)
mysql>
[root@master mysql57]# cat st_file
aaa bbb
ccc ddd
5、导入
mysql> create table tab2 as select * from tab1;
Query OK, 2 rows affected (0.02 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> desc tab2
-> ;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| aa | varchar(50) | YES | | NULL | |
| bb | varchar(50) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)
mysql> select * from tab2;
+------+------+
| aa | bb |
+------+------+
| aaa | bbb |
| ccc | ddd |
+------+------+
2 rows in set (0.00 sec)
mysql> truncate table tab2;
Query OK, 0 rows affected (0.02 sec)
mysql> select * from tab2;
Empty set (0.00 sec)
mysql> load data infile '/mysql/mysql57/st_file1' into table tab2;
ERROR 1142 (42000): INSERT command denied to user 'filetest'@'localhost' for table 'tab2'
##root登陆授权：
mysql> grant insert on test.* to filetest@localhost;
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
##重新登陆：
mysql> load data infile '/mysql/mysql57/st_file1' into table tab2;
Query OK, 2 rows affected (0.01 sec)
Records: 2 Deleted: 0 Skipped: 0 Warnings: 0
mysql> select * from tab2;
+------+------+
| aa | bb |
+------+------+
| aaa | bbb |
| ccc | ddd |
+------+------+
2 rows in set (0.00 sec)
小实验完成。
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