问题
I'm doing this SELECT LOAD_FILE("/home/user/domains/example.com/public_html/robots.txt") AS tmp FROM tmpTable but it returns NULL. How can I check if this is because I haven't got the FILE privilege or if it's something else? MySQL won't give an error. (I'm using PHP)
Anyone that has experience with LOAD_FILE, tell me about that function:)
<?php
$result = mysql_query('SELECT LOAD_FILE("/home/user/domains/example.com/public_html/robots.txt") AS tmp FROM tmpTable') or die(mysql_error());
while($row = mysql_fetch_assoc($result))
{
var_dump( $row['tmp'] );
}
回答1:
Looks like some versions of MySQL on Linux distributions have a bug with the LOAD_FILE function. Here is the thread. At the very end of the thread looks like there might be a workaround.
EDIT:
Since you're on a shared host, looking at the functionality you want could you just read the file instead? Using the file() should read the file into an array format.
回答2:
A really ugly workaround can be found here:
http://angkatbahu.blogspot.com.es/2011/03/mysql-loadfile-function-in-ubuntu-it_12.html
If you put the files you want to load in /var/lib/mysql/all_images directory, it works!
Tested in ubuntu 12.10 (and no, chomd'ing files to mysql user, didn't work)
回答3:
TO see what privileges you have, use show grants.
I have documented some additional commands you can use to check if you meet the conditions here:
http://pastebin.com/Dvsdxh9Y
Addendum I would make to the documentation. Make sure:
- there is execute permission on the parent directory
- The FILE privilege must is explicily granted. (GRANT FILE on . TO user@localhost)
- You have flushed privileges
- You have logged out and logged back in
Example of permission on parent dir:
mysql> \! ls -ld `dirname /home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg`
drwxrwxr--. 2 jlam jlam 4096 May 12 14:22 /home/jlam/code/projectName/doc/filesForTesting/images
mysql> select hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/image
Test01.jpg'));
+-------------------------------------------------------------------------------------------------------------+
| hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg')) |
+-------------------------------------------------------------------------------------------------------------+
| NULL |
+-------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> \! chmod o+x /home/jlam/code/projectName/doc/filesForTesting/images
mysql> \! ls -ld `dirname /home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg`
drwxrwxr-x. 2 jlam jlam 4096 May 12 14:22 /home/jlam/code/projectName/doc/filesForTesting/images
mysql> select hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'));
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'))
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| FFD8FFE1001845786966000049492A00080000000000000000000000FFEC00114475636B7900010004000000500000FFE10407687474703A2F2F6E732E61646F62652E636F6D2F7861702F312E302F003C3F787061636B657420626567696E3D22EFBBBF222069643D2257354D304D7043656869487
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Example of user privileges:
16:38:09 (getImages) ~/code/projectName/doc/filesForTesting/images$ mysql -u eventCal -p eventCal
Enter password:
mysql> show grants;
+-----------------------------------------------------------------------------------------------------------------+
| Grants for eventCal@localhost |
+-----------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'eventCal'@'localhost' IDENTIFIED BY PASSWORD '*xxxxx' |
| GRANT ALL PRIVILEGES ON `tmp`.* TO 'eventCal'@'localhost' |
| GRANT ALL PRIVILEGES ON `eventCalTesting`.* TO 'eventCal'@'localhost' |
| GRANT ALL PRIVILEGES ON `eventCal`.* TO 'eventCal'@'localhost' |
| GRANT ALL PRIVILEGES ON `eventCal_categoryMigration`.* TO 'eventCal'@'localhost' |
+-----------------------------------------------------------------------------------------------------------------+
5 rows in set (0.00 sec)
mysql> select hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'));
+-------------------------------------------------------------------------------------------------------------+
| hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg')) |
+-------------------------------------------------------------------------------------------------------------+
| NULL |
+-------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
In other root session:
mysql> grant file ON *.* to eventCal@localhost; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
Back in user session, I still can't load the file
mysql> select hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'));
+-------------------------------------------------------------------------------------------------------------+
| hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg')) |
+-------------------------------------------------------------------------------------------------------------+
| NULL |
+-------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
.....But if I log out and back in:
mysql> exit
Bye
16:40:14 (getImages) ~/code/projectName/doc/filesForTesting/images$ mysql -u eventCal -p eventCal
Enter password:
mysql> select hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'));
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| hex(LOAD_FILE('/home/jlam/code/projectName/doc/filesForTesting/images/imageTest01.jpg'))
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| FFD8FFE1001845786966000049492A00080000000000000000000000FFEC00114475636B7900010004000000500000FFE10407687474703A2F2F6E732E61646F62652E636F6D2F7861702F312E302F003C3F787061636B657420626567696E3D22EFBBBF222069643D2257354D304D7043656869487
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
来源：https://stackoverflow.com/questions/4607486/mysql-load-file-returning-null