How to display an image of BLOB type from a Table in an OAF page?

Hi,
My requirement is that in the database table images gets saved of type BLOB and i have to display these images in my OAF page .I looked in OA developers guide and followed the instruction but unable to achieve my requirement .As per the developers guide "I created an item of type messageDownload ,in the viewattribute i set the view attribute FileData and File View Attribute FileContentType the table used is FND_LOBS" but i couldn't achieve anything.
Please help me and if possible give me exact way to achieve it as i am new to this framework.
Thanks in advance

Map the database table columns to the Table region columns. For image column set the item style as "Messagedownload". Set the View Instance (VO) , View Attibute Name (image name) and View Attribute Data (blob col).

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l_length NUMBER;
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