MySQL的LOAD_FILE（）加載空值

我試圖加載一個目錄的XML文件到數據庫表作爲斑點。每行將包含一個相應的blob文件。當通過python腳本將文件加載到表中時，值被插入爲空值。在mysql命令行中運行等效命令時也是如此。MySQL的LOAD_FILE（）加載空值

有一點我能夠在將某些文件夾權限更改爲mysql後插入值，但由於需要腳本權限，我不得不修改目錄/ var/lib/mysql/foo的所有權，因此值將被重新插入爲null有效地打破了我寫的腳本。我不記得必要的目錄權限更改。

以下是話題的討論：

http://bugs.mysql.com/bug.php?id=38403

隨着

MySQL LOAD_FILE returning NULL

來源

2013-08-05 arete

確保：

有父目錄
文件權限必須被授予explicily執行權限。（。上GRANT FILE對用戶@本地）
你已經刷新特權
您已註銷，並重新登錄權限的

例如在父目錄：

 

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

用戶權限示例：

 

16:38:09 (getImages) ~/code/projectName/doc/filesForTesting/images$ mysql -u eventCal -p eventCal 
Enter password: 

mysql> show grants; 
+-----------------------------------------------------------------------------------------------------------------+ 
| Grants for [email protected]                     | 
+-----------------------------------------------------------------------------------------------------------------+ 
| GRANT USAGE ON *.* TO 'eventCal'@'localhost' IDENTIFIED BY PASSWORD '*xxxx' | 
| 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)

在其他根會話：

 

mysql> grant file ON *.* to [email protected]; 
Query OK, 0 rows affected (0.00 sec) 

mysql> flush privileges; 
Query OK, 0 rows affected (0.00 sec)

回到用戶會話，我仍然無法加載文件

 

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)

.....但是，如果我註銷並重新登錄在：

 

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

來源

2014-05-12 20:45:12

很好的解釋，但沒有解決 –

@Acubo的答案下面提供了一個額外的線索。我的回答是在2014年寫回來的，可能平臺的默認配置已經改變。 –

爲了加載文件的工作確保所有的權限被授予爲MySQL主人和組。

chown mysql:mysql /var/lib/mysql/foo/* 
chmod go+rw /var/lib/mysql/foo/*

來源

2013-08-14 20:29:17 arete

這是最後的關鍵步驟，它最終允許我在數據庫中加載所需的文件。 'show VARIABLES'表明secure_file_priv變量設置正確，但我仍然無法加載文件。 – user208145

我複製了/var/lib/mysql/images（創建圖像文件夾後）的圖像，它的工作！

來源

2016-12-07 11:27:54

我已經失去了一些時間與這個問題。在我的情況下，問題必須與「my.ini」中定義的變量secure_file_priv有關。

從MySQL文檔：

如果secure_file_priv系統變量設置爲一個非空目錄名，要加載的文件必須位於該目錄

因此，有兩種方式：

1）刪除此選項 2）使用上傳文件的默認文件夾（「C：\ ProgramData \ MySQL \ MySQL Server 5.7 \ Uploads」）。我也不得不在Windows中使用雙斜槓。

來源

2017-06-06 10:22:53 Acubo

MySQL的LOAD_FILE（）加載空值

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