I tried to add an image as Attachment image to a post.
wp_postmeta i added
value = productimages/Routers/v/CISCO1941.jpg
it not works and i could not see the image as attachment! but when i use add image button in wordpress's HTML editor, it add exactly this field to that table but with a different post ID!
is there any dependency for that field? screenshot from db: http://i.stack.imgur.com/mVlse.png