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mysql> describe gw_ir;
+------------+-------------+------+-----+---------+----------------+
...
| image_file | mediumblob  | YES  |     | NULL    |                |
+------------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

use LWP::Simple;
use DBI;
...
  close $fh;
  return $data;
}