Save and Load Data from MySQL DB

[kean]

At the moment i load and save Userpictures (smaller 10kb) to the Harddisk. Now i want to save them to the MySQL DB. How can i save files (jpg) with DBD::mysql into a BLOB Field and load them into a Tk-Label?

[CountZero]

You cannot save a Tk-widget into a database: it is not an acceptable datatype for a database. If you want to save a widget, you should invent a suitable way of serializing the data in the widget, but in this case it would be easier and faster to just save the picture file itself.

[stefbv]

This code is from an old application, you have to experiment a little with it, it should work but not tested lately.

Note that I used base64 encoding and the data was saved to a BLOB field of subtype text in a Firebird database.

use MIME::Base64;
...
    
#- New Label
my $label = $pane->Label(
    -width  => 646,
    -height => 486
)->pack;

#- Default empty image
my $jpgimg = $label->Photo(
    -format => 'jpeg',
    -file   => '',
);

$label->configure( -image => $jpgimg );

#- Process image

open my $fh, '<', $img_file
    or die "Can't open file ", $img_file, ": $!";

binmode $fh;

my $photo = do { local $/; <$fh> };

close $fh;

my $stream = encode_base64($photo) or die $!;

#- Load image in Label

$label->blank;
$label->configure( -format => 'jpeg', -data => $stream );

#- Retrieve value for DB insert

my $value = $label->cget( -data );

Regards, Stefan

[Anonymous Monk]

What have you tried?

[kean]

I tried this to save:

use strict;
use warnings;
use Tk;
use Tk::JPEG;
use DBI;

my $datenbank = "bilder";
my $db_host = "localhost";
my $db_port = "3306";

my $db_user = "root";
my $db_pw = "12345";

my $dbh;

my $dsn  = "DBI:mysql:database=$datenbank;host=$db_host;port=$db_port"
+;

eval {
                $dbh = DBI::->connect( $dsn, $db_user, $db_pw, { Raise
+Error => 1, PrintError => 0, AutoCommit => 1 } );
         };
         
if ($@)  
        {
        print DBI::errstr;
        }

my $mw = MainWindow->new();
        
my $bild = $mw->Photo( -file => "test.jpg" );

$dbh->do("INSERT INTO User (User,Bild) values (?,?)", undef, "2", $bil
+d);

my $label = $mw->Label(-image => $bild, -background => '#ffffff')->pac
+k();                                                      

MainLoop;

And this to read:

use strict;
use warnings;
use Tk;
use Tk::JPEG;
use DBI;

my $datenbank = "bilder";
my $db_host = "localhost";
my $db_port = "3306";

my $db_user = "root";
my $db_pw = "12345";

my $dbh;

my $dsn  = "DBI:mysql:database=$datenbank;host=$db_host;port=$db_port"
+;

$dbh = DBI::->connect( $dsn, $db_user, $db_pw, { RaiseError => 1, Prin
+tError => 0, AutoCommit => 1 } );

my $mw = MainWindow->new();
    
my $sql = "SELECT Bild FROM User WHERE User = 2;";
my $sth = $dbh->prepare($sql);
$sth->execute;

my $bildausdb;
($bildausdb) = $sth->fetchrow_array;

my $bild = $mw->Photo( -data => $bildausdb );

my $label = $mw->Label(-image => $bild, -background => '#ffffff')->pac
+k();        

MainLoop;

[RichardK]

$bild is a TK widget not your image data. Perhaps you need to store that data in the file 'test.jpg' instead?

[Anonymous Monk]

Which part are you having problems with?

Please read How do I post a question effectively?.