I guess that it's valid for MySQL, however, I cannot find anything about SQLite.
Basically, I have a table which is named 'CUSTOMER'.
So I create an attribute like this:
.. Image BLOB .. after that my insert statement looks like this:
INSERT INTO CUSTOMER(1,LOAD_FILE(D:/Project/Images/X.jpg));
However, the LOAD_FILE tag is not working and I don't know how to insert an image or if we can do that.
If you're using the sqlite3 shell, the relevant function is readfile().
If you're doing this from your own program, you have to read the file into a byte array and bind it as a blob to the desired column in an insert. The exact details vary depending on language and sqlite bindings, but you shouldn't ever have to convert it to a blob literal string and embed that directly into a statement.
You can store an image as a BLOB, but you'd have to insert it as a a series of bytes using something like :-
INSERT INTO CUSTOMER (image_column, other_column) VALUES(x'0001020304........','data for the first other column');
So you'd need to convert the file into a hex string to save it.
However, it's not really recommended to store images but to rather store the path to the image and then retrieve the file when you want to display/use the image.
Saying that, SQLite can, for smaller images (say 100K), actually be more efficient 35% Faster Than The Filesystem.
You must use the cmd command line (windows) to insert the attachment. The sqllitespy (version 1.9.13) does not support de command from the program command line.
You should acess you database first with the CMD and after that;
update (your table) set (column) = readfile ('dir where the files are stored'||num||´.jpg);
Related
I am currently working on a warehouse management system operated on a Raspberry Pi. Scanning a QR code should open the correct line of the database.
I read the text file/CSV file containing the QR code into my Table QR database via:
insert into QR values(readfile("C:\...\IDNumberfromQR.csv"));
this works, because the ID number appears in the database in the correct table. However, the content of the text file is read in the file type "Blob".
If I now make a table comparison via
SELECT * from warehouse management table
where PulverID=( select code from QR);
nothing appears.
However, if I enter the ID number on the computer in the table QR.code and do not have the ID read in via my file, the line I am looking for appears. So it is obviously a Data format problem.
What I already tried:
I have already set both to blob in the settings. This still did not work. The functions found in the SQLiteStudio tutorial like import(file,format,table) don't work either.
Does anyone have any idea how i can solve this problem?
Is it possible to read a CSV file as double?
I recently moved my mp3 library to my home folder, and this caused banshee to forget my file data (such as rating, ect). If I can update the file path in banshee's sqlite table, I can get restore my user-entered file data.
sqlite stores path data in a Uri field of the CoreTracks table.
Example:
Uri
file:///storage/Music/mp3/Genre/Artist/Album/Track.mp3
I'd like to change all instances to
file:///home/user/Music/mp3/Genre/Artist/Album/Track.mp3
Is there a safe way of changing just the first 15 characters of data contained in the Uri field?
Create the database backup. Then use the sqlite.exe command line shell. open your database like this:
sqlite rating.sqlite
> UPDATE CoreTracks SET Uri = 'file:///home/user' + substr(Uri, 17);
>
At the end press Ctrl-D to finish the sqlite console. I think I counted the characters correctly. Please double check if value 17 needs to be changed to something else
I have a sqlite database from which I want to extract a column of information with the datatype BLOB. I am trying this:
SELECT cast(data as TEXT) FROM content
This is obviously not working. The output is garbled text like this:
x��Uak�0�>�8�0Ff;I�.��.i%�A��s�M
The data in the content column is mostly text, but may also have images (which I recognized could cause a problem if I cast as TEXT). I simply want to extract that data into a usable format. Any ideas?
You can use
SELECT hex(data) FROM content
or
SELECT quote(data) FROM content
The first will return a hex string (ABCD), the second quoted as an SQL literal (X'ABCD').
Note that there's (currently) no way of converting hexadecimal column information back to a BLOB in SQLite. You will have to use C/Perl/Python/… bindings to convert and import those.
You can write some simple script which will save all blobs from your database into files. Later, you can take a look at these files and decide what to do with them.
For example, this Perl script will create lots of files in current directory which will contain your data blob fields. Simply adjust SELECT statement to limit fetched rows as you need:
use DBI;
my $dbh = DBI->connect("dbi:SQLite:mysqlite.db")
or die DBI::errstr();
my $sth = $dbh->prepare(qq{
SELECT id, data FROM content
});
$sth->execute();
while (my $row = $sth->fetchrow_hashref()) {
# Create file with name of $row->{id}:
open FILE, ">", "$row->{id}";
# Save blob data into this file:
print FILE $row->{data};
close FILE;
}
$dbh->disconnect();
I am using C# for front end and Oracle as a database. I have a BLOB type field in a table and is used to contain images. What I actually need to do is that whenever a record in table doesn't contain any image I want to show default pic for that particular record in front end. For that purpose can I get a binary format of that default image(without saving that image with a dummy record) after saving it temporarily in database, and then using that binary format in query to show default pic when the image doesn't exists for any record. What I am getting now is :
SELECT EMP_IMG FROM Employee_Master WHERE EMP_CODE = 1234
----------------------------------------------------------
(BLOB)
Look into byte[]; use Binary Serializer to get the byte[] version of the object.
See this: C# Object Binary Serialization
I create a full-text search index on varbinary(max) column and insert file content into this column.(files like docx,xlsx,txt,...) I create an extension column for specify content type.but when I query this table with contains,
SELECT *
FROM tblFiles
WHERE CONTAINS(tblFiles.FileContent, 'web OR webserver');
no result were showing.why?
You may need to wait a bit after defining a full text index, because the index itself is created in the background; it's an async process, not synchronous. For a small table it may not be noticeable, but for a large one, it will be.
Also, make sure the types in your file type column start with a dot: .docx instead of just docx.
I found why my query dont work. because files that inserted into db was docx and in my database does not exist any filter for this format.I inserted a doc document and query it.It works. :)
Thank you.