there is no way to actually add the image to the database.
what you have to do is have a table that saves the image names. your php script will upload the file to a specified folder and add the record with the file name to the database.
so you will need something like this to add an image
upload the image to
then query the $file_name for the image that you want to display
<img src='<? echo $IMAGE_URL.$file_name; ?>'>
do a google search for php file uploads. there are plenty of examples. the example may not include database inserts, but after the file is successfully uploaded, do a query something like this
"insert into images (file_name) values ('$file_name')";
that should be enough info to get you going