问题
I have a MYSQL database with a column named img of BLOB type.
When I insert a value into that column like this :
LOAD_FILE('C:/Documents and Settings/All Users/Documents/My Pictures/Sample Pictures/Sunset.jpg')
it works !
But like this :
LOAD_FILE('C:/Documents and Settings/Administrator/My Documents/My Pictures/picture.jpg')
it doesn't work and it tells me that the column img cannot be null !
And in both cases the file exists, and I'm connecting to the database as the root user (all privileges), so I don't understand why I'm getting this error.
Thanks in advance
回答1:
Maybe problem with max_allowed_packet
1.jpg is a small picture and 2.jpg is a big picture
mysql> DESCRIBE blob_files;
+-------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| file | blob | YES | | NULL | |
+-------+---------+------+-----+---------+----------------+
2 rows in set (0.01 sec)
mysql> INSERT INTO blob_files(file) VALUE(LOAD_FILE('D:/2.jpg'));
Query OK, 1 row affected, 1 warning (0.00 sec)
mysql> SHOW WARNINGS;
+---------+------+--------------------------------------------------------------
------------------+
| Level | Code | Message
|
+---------+------+--------------------------------------------------------------
------------------+
| Warning | 1301 | Result of load_file() was larger than max_allowed_packet (104
8576) - truncated |
+---------+------+--------------------------------------------------------------
------------------+
1 row in set (0.00 sec)
mysql> INSERT INTO blob_files(file) VALUE(LOAD_FILE('D:/1.jpg'));
Query OK, 1 row affected (0.05 sec)
回答2:
I'm going to post this as an answer, and I'll modify it as needed. In the comments I mentioned mysqld needs to run as administrator. Upon consideration, I realized this is actually not a good idea, since windows UAC is in place for a reason. A better option is to add the necessary permission to the folder.
Go to your My Documents folder under administrator, right click on My Pictures, go to security, and add "LOCAL SERVICE" to your permissions with the read attribute. Then your MySQL server should be able to read from that folder.
If you want to verify LOCAL SERVICE is the proper account, go to start -> run and type services.msc and press enter. Find MySQL, right click and hit properties, go to the Log On tab and see which account it runs as. This is the one you should add to the security tab of the folder with the read permissions.
来源：https://stackoverflow.com/questions/23575836/insert-a-blob-value-into-mysql-database