I used the following code for uploading an image file into my database from an answer in stack overflow, but it is not getting updated. Please help.
mysql> update S516 set photo = LOAD_FILE('/home/rsreekumar/db/java16/photos/13134.PNG') where roll_no = "AM.EN.U4CSE13134";
Query OK, 0 rows affected (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 0
My question is same. but not working.
Can you check?
mysql user has permissions to read file
where condition is correct
column photo is blob
you have permissions to use LOAD_FILE
file size less than max_allowed_packet bytes
if the secure_file_priv system variable is set to a nonempty directory name, the file to be loaded must be located in that directory
is AppArmor protection running (and blocking)?
Related
I'm using mariadb with this code:
UPDATE files SET file_source = REGEXP_REPLACE (file_source, 's:[1-9][1-9][1-9]|s:[1-9][1-9]|s:[1-9]', "s:12") WHERE type = 2;
I want to change all the columns where s: is followed by up to 3 numbers, and replace it with s:12
But when I run this it says:
Query OK, 10012 rows affected (0.118 sec)
Rows matched: 10375 Changed: 10012 Warnings: 0
I don't understand why? How I can see what didn't change and why? Is there a error in my code?
Also if I run this twice, it will say 0 changed, but from my understanding, this code should change everything again to s:12 even if it's already s:12or am I wrong?
This works fine
Update Table1 SET file_source =
REGEXP_REPLACE (file_source, 's:[0-9]?[0-9]?[0-9]', 's:12') Where TYPE = 2;
With s:1
s:31
and s:111
See https://dbfiddle.uk/?rdbms=mariadb_10.4&fiddle=506350e8fa09b7270fb5e8b46c2e2f6f
Okay, I understand what are errors and warnings in the context of MySQL. But what's the need of note-level warning? I have already searched the MySQL documentation but didn't find anything relevant. It would be better if someone could shed some light on the what are they and why they are useful.
mysql> create database if not exists city;
Query OK, 1 row affected, 1 warning (0.00 sec)
mysql> show warnings
-> ;
+-------+------+------------------------------------------------+
| Level | Code | Message |
+-------+------+------------------------------------------------+
| Note | 1007 | Can't create database 'city'; database exists |
+-------+------+------------------------------------------------+
1 row in set (0.00 sec)
I've always considered Note to be like an "FYI": something happened, or didn't, that may be of interest. The closest definition I can find in the docs is:
... events that do not affect the integrity of the reload operation
which is from the sql_notes server variable, one perhaps not often used outside of mysqldump.
Trawling through the MySQL source code, looks like Sql_Condition::SL_NOTE annotates warnings of this level. There are a few, but they are mostly as you'd expect for non-impactful information:
Event already exists
Table already exists
Query '%s' rewritten to '%s' by a query rewrite plugin
Password set
Sadly, I would have expected the code docblock to give a little more information about them, but it doesn't:
class Sql_condition {
public:
/**
Enumeration value describing the severity of the condition.
*/
enum enum_severity_level { SL_NOTE, SL_WARNING, SL_ERROR, SEVERITY_END };
This might warrant a documentation bug report to MySQL team.
Interestingly, MariaDB has this to say:
A note is different to a warning in that it only appears if the sql_notes variable is set to 1 (the default), and is not converted to an error if strict mode is enabled.
My takeaway from that, in Maria and possibly by extension MySQL: notes are warnings, but ones that can be ignored because no data-loss or side-effect is described.
What's wrong with this code, I want to insert an image to table, but when I was executed this code the result of image field is NULL.
I try with MySQL Workbench executing:
CREATE TABLE image(keyh int, img blob);
INSERT INTO image VALUES(1, load_file('d:\Picture\cppLogo.png'));
To use this function, the file must be located on the server host, you
must specify the full path name to the file, and you must have the
FILE privilege. The file must be readable by all and its size less
than max_allowed_packet bytes. If the secure_file_priv system variable
is set to a nonempty directory name, the file to be loaded must be
located in that directory.
If the file does not exist or cannot be read because one of the
preceding conditions is not satisfied, the function returns NULL.
http://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_load-file
What can you do?
Check which user mysql is running with, and make sure the file is readable by that user. Make sure the security settings allow the file to be read and it is not of greater size than max_allowed_packet.
See SHOW VARIABLES LIKE 'max_allowed_packet'.
For me, it looks like the file is on your localhost and you try to upload it. This is not possible using LOAD_FILE(). The file must be already on the server.
The issue can also be caused by your windows directory seperator character \ (like RiggsFolly said), which is used for escaping instead, switch to unix style / then:
LOAD_FILE('D:/Picture/cppLogo.png')
Or your Image is of greater filesize than a BLOB field can hold, like Balazs Vago said.
i was found the correct syntax is following this:
C:/wamp/binsql5.5.20/data/56VRLRFE.jpg'
not this
C:\wamp\binsql5.5.20\data\56VRLRFE.jpg'
thanks guys for all your Answer :D
Open your MySql Command Line Client and login with root user and type
mysql> SHOW VARIABLES LIKE "secure_file_priv";
this will show you the secure path used by MySql to access the files. something like
+------------------+-----------------------+
| Variable_name | Value |
+------------------+-----------------------+
| secure_file_priv | /var/lib/mysql-files/ |
+------------------+-----------------------+
you can either paste files inside this folder or change the "secure_file_priv" variable value to "empty string" so that it can read file from anywhere.
On Windows the fundamental problem is that MySql, by default, runs as a Windows service under the Network account which means that there are only a few file locations the server can access. Thus for load_file to work, the file must be placed in a folder on the server which can be read by the service. There seems to be no documentation on this. In my investigation the only folder that works with load_file is C:\ProgramData\MySQL\MySQL Server 8.0\Uploads
Run a query to test the load...
select load_file('C:\\ProgramData\\MySQL\\MySQL Server 8.0\\Uploads\\1.txt') ;
Note on windows you have to use either double \ or / to separate the path elements. This will return NULL on failure, otherwise the contents of the file.
Assume now a table named db.image with columns source and image. Source is character and image is blob. The command to load a.jpg into the table would be
insert into db.image (source,image) values ('a.jpg',load_file('c:/programdata/mysql/mysql server 8.0/uploads/a.jpg'));
Store Directly Without folder name for example-
create table myimg(id int, image mediumblob);
insert into myimg values(101, load_file("E://xyz.png"));
I use attribute DATA DIRECTORY
My code:
mysql> CREATE TABLE t2(id int) ENGINE=MyiSam DATA DIRECTORY='D:/';
Query OK, 0 rows affected, 1 warning (0.05 sec)
mysql> show warnings;
+---------+------+---------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------+
| Warning | 1618 | <DATA DIRECTORY> option ignored |
+---------+------+---------------------------------+
1 row in set (0.00 sec)
How fixed warning ?
Per the manual:
These options work only when you are not using the --skip-symbolic-links option. Your operating system must also have a working, thread-safe realpath() call.
Form a post on the MySQL forums
My understanding is that the Windows implementation of realpath() is incomplete, so create table data dir and index dir options don't work on Windows.
Therefore, you might be able to get a different folder using relative paths, or possibly using symbolic links
I want to store images and .docx/.doc, .pptx/.ppt, .pdf files using the front end of my software. I don't understand how to implement this and how to insert the BLOB and CLOB files into the table. Please help.
I am using Kubuntu 11.04, MySQL5, Qt 4.7.3.
Two ways:
1 - Use a LOAD_FILE function -
INSERT INTO table1 VALUES(1, LOAD_FILE('data.png'));
2 - Insert file as hex string, e.g. -
INSERT INTO table1 VALUES
(1, x'89504E470D0A1A0A0000000D494844520000001000000010080200000090916836000000017352474200AECE1CE90000000467414D410000B18F0BFC6105000000097048597300000EC300000EC301C76FA8640000001E49444154384F6350DAE843126220493550F1A80662426C349406472801006AC91F1040F796BD0000000049454E44AE426082');
INSERT INTO MY_TABLE(id, blob_col) VALUES(1, LOAD_FILE('/full/path/to/file/myfile.png')
LOAD_FILE has many conditions attached to it. From the MySQL documentation:
LOAD_FILE(file_name)
Reads the file and returns the file contents as a string. To use this
function, the file must be located on the server host, you must
specify the full path name to the file, and you must have the FILE
privilege. The file must be readable by all and its size less than
max_allowed_packet bytes. If the secure_file_priv system variable is
set to a nonempty directory name, the file to be loaded must be
located in that directory.
If the file does not exist or cannot be read because one of the
preceding conditions is not satisfied, the function returns NULL.
Also, there there are bugs with LOAD_FILE in Linux. See http://bugs.mysql.com/bug.php?id=38403 for the bug, and MySQL LOAD_FILE returning NULL for workarounds. On Ubuntu 12.04, MySQL 5.5.32, this works for me:
Copy file to /tmp
Change ownership to mysql user chown mysql:mysql /tmp/yourfile
Log into mysql as mysql root user so you are sure you have FILE privilege
Run your insert statement
Or you could merely use the MySQL Workbench, select the rows, last rows, insert a row without the blob, then just right click and select "Load Value From File".
INSERT INTO table1 VALUES(1, LOAD_FILE(data.png));
won't work but
INSERT INTO table1 VALUES(1, LOAD_FILE('data.png'));
should (assuming data.png exists in the local directory)
for those People who are getting "Column 'image' cannot be null" error while saving Blob through query :-
Open your MySql Command Line Client and login with root user and type
mysql> SHOW VARIABLES LIKE "secure_file_priv";
this will show you the secure path used by MySql to access the files. something like
+------------------+-----------------------+
| Variable_name | Value |
+------------------+-----------------------+
| secure_file_priv | /var/lib/mysql-files/ |
+------------------+-----------------------+
you can either paste files inside this folder or change the "secure_file_priv" variable value to "empty string" so that it can read file from anywhere.
If you are using mysql workbench, just right click on the field (cell) and select 'load value from file' option and then browse to the file and click open and then click on apply. It will automatically generate query like this
UPDATE `dbname`.`tablename` SET `columnname` = ? WHERE (`row` = '1');