Images in MySQL - mysql

Is there a Image related data type in MySQL that can be used for storing images for each recor?

Performance-wise it's probably better to store the file as a file on the drive and only write the filename or filepath and maybe the mime type into the database. But as the others say, BLOB is what you seek.

Like said before, blob is the way to go, however, as SanHolo points out it's not really performance-wise and you will eventually run into problems as your database can grow really really fast!
Why don't you index the file-name on the database and store the file on the server?
The mainly reason to not allow something like this would be security issues. If you are really trying to cover your bases by not allowing all users to see or grab content you have two options.
Option A) give the file a unique, non-identifiable name like Flickr does. The name of the file comprehends two hashes. A user hash and a file-hash. The second hash is secret and the only way you could get it would be by trial and error. Take a look into this file I have on Flickr. Is user-protected (only family can see) but you will be able to access it just fine as the URL itself serves as a protection: http://farm2.static.flickr.com/1399/862145282_bf83f25865_b.jpg, even if you were randomly trying to generate hashes and found a valid one it would be hidden by anonymity as you wouldn't know who it was from.
Option B) use a server side thecnology to limit the access. This method is safer but more expensive to the server. You will set up a script that will allow/deny access to the file based on session_permissions or something alike. Look at the following code that would be called by accessing something like:
http://yourserver.com/getprotectedfile.php?filename=213333.jpeg
session_start();
// logic to verify the user is ok
if($_SESSION['user_access']!=true) {
exit('user not allowed here');
// WATCHOUT! THIS IS NOT SECURE! EXAMPLE ONLY.
// on a production site you have to be sure that $filename will not point to a system file
$filename = $_GET['filename'];
// gets the file and outputs it to the user
header('Content-type: image/jpeg');
header('Content-Length: '.filesize($filename));
readfile($filename);

You'll need to use some sort of BLOB type:
MySQL Reference: BLOB and TEXT types
Which type you use depends on the size of the image you wish to store.

Try one of the BLOB data types.

Yes , there are some datatypes to store image into database.
BLOB (Binary large object)
which can be specially use for Storing of image files into database.
The four BLOB types are ' TINYBLOB ',' BLOB ', ' MEDIUMBLOB and 'LONGBLOB '. These differ only in the maximum length of the values they can hold.
Creating table:
CREATE TABLE image (imgname VARCHAR(33) , photo LONGBLOB );
For inserting Values refer to Insert Picture into SQL Server 2005 Image Field using only SQL
I have Stored one image file in database by using java jdbc, So if you want to see how image file is stored in database
click the link : https://ibb.co/frCpt37

Related

How to extract the value that is in JSON format in MYSQL table

I have a mysql table WEBSITE_IMAGES in which one of the field name called Value has data in JSON format.
Value field looks like below:
I am wondering how I can extract product_name and image_name only. (eg: 14669 golden.png, 14754 tealglass.png)
{"1235":"custom_images","options":{"1235":{"product_image":"image","color":"","image":"{\"14669\":\"\/s\/i\/golden.png\",\"14754\":\"\/s\/m\/tealglass.png\"
Best solution is the set your directory addresses in the programming settings side.
In case of file trouble or migration, you will have problem with your files and data. Keep your data simple. Let your program do the file locations later.
With that, you will have less trouble with slashes and conversion.

Why type data "long blob" in mysql read as "int8" in data explorer MATLAB?

I am trying to select data in MySQL JDBC in MATLAB. One of the columns (file_data) in the table has the type "longblob". More details of the content of the file_data is shown on the picture below.
The two first lines are the header, and the remain-rows are the data. Before I save this file into the database MySQL (using spring-MVC and JSP), the file is a CSV file, which has delimiters ";".
The picture below is the table of the database. You can see the type of column file_data is "longblob".
But why when I try to preview the database in database explorer in MATLAB, it should be blob, but it showed "int8". More details please look at the picture below.
According to that, I have questions:
How make the file_data can be read in MATLAB as "longblob" and not "int8"?
if the column "file_data" already successful change to longblob, how to read it as a table, so make me possible to process the data?
CountOfBytesx1 Int8 is equal to longblob. Int8 is the Matlab Byte and CountOfBytes is the number of bytes stored.
You can convert it back to a file with something like:
fid = fopen(file_name,'w')
fwrite(fid,file_data,'*int8')
fclose(fid)
Code from matlab answers. Where file_name and file_data are the fetched values from your query.
Alternatively, you can try one of the solutions of Retrieve blob field from MySQL database with MATLAB
To read the CSV-Data use csvread
When you have solved your question, add the solution to your cross post too.
BTW: I never used Matlab, but a simple websearch for Matlab int8 longblob guided me.

Find directory content using a string contening full path of many files with a sql request

I have a huge databases containing 200K to ~1M files paths (these are all files saved on a hubic server).
I'm developping an application which print a tree of these dirs and files to allow user to select the files they want to download from the server.
Problem : when I click my "+" button to show a directory content, I have to parse all my table and check if each path belong to my dir.
This takes way too much time. (8s per directory on the smallest server)
How should I do to minimize this ? Is there a way to keep my paths alphabetically sorted so I can avoid parsing the all table ?
Thanks in advance,
José Todeschini.
You should index your path (or even better make it the primary key) and search like this:
SELECT *
FROM mytable
WHERE path LIKE '/var/public/a/b/c/%'
Note that this should be a string constant, including the percent sign, otherwise the index will not be used.

Junk characters at the beginning of file obtained via column transformations in SSIS

I need to export varbinary data to file. But, when I do it using Column Transformations in SSIS, the exported files are corrupt. There are few junk characters at the start of the file. On removing them, the file opens fine.
A similar post for BCP, says that these characters specify the data length.
Would like to know how to address this issue in SSIS?
Thanks
Export transformation is used for converting the varbinary to files.I have tried something similar using Adventure works which has image type of var-binary data.
Following Query is used for the Source query. I have Modified the query
since it does not have the full path to write image files.
SELECT [ProductPhotoID]
,[ThumbNailPhoto]
,'D:\SSISTesting\ThumnailPhotos\'+[ThumbnailPhotoFileName]
,[LargePhoto]
,'D:\SSISTesting\LargePhotos\'+[LargePhotoFileName]
,[ModifiedDate]
FROM [Production].[ProductPhoto]
Used the Export column transformation[also available in 2005 and
2008] and configured as follows.
Mapped rest of the columns to the destination.
After running package all the image files are written into the
respective folders[D:\SSISTesting\ThumnailPhotos\ and D:\SSISTesting\LargePhotos].
Hope this helps!

Database design (MySql)::should we put html data in text field inside database table or more efficient to save inside text.txt file?

We building big Web Application and we use mysql, we want to make mysql database more fast.
Some of us think if we will put message html body inside table and not inside text.txt in will make database heavy and not fast.
Thanks,
*Part of main table that hold message:
option 1:hold html message body inside database
message {
id (int)
subject (varchar)
body (text)
}
option 2: hold html message body inside body1.txt file
message {
id (int)
subject (varchar)
file_body_path (varchar)
}
*
If you:
Don't need transactional control over the contents of your files and
Only treat the files as an atomic entity (i. e. don't parse them, search for their content etc.)
, then you better store them out of the database.
The HTTP server will serve the disk-based files much faster to begin with.
As Quassnoi correctly points out, the webserver will most likely be faster serving txt files than data from the DB ...
BUT: This only works if the webserver doesn't have to run any searches/queries against the DB to build the links between the TXT files.
Think of these use cases:
remove a text file
add a text file
add a link to a text file
remove a link from a text file
find a text passage within a text file.
each of these use cases will require your parsing the TXT file and maintaining all the needed links in the 'index-pages'. How will you do this in your content management system?