[Zope-dev] Images in Oracle's BLOB Field

[Leonardo Rochael Almeida]

Juan Javier Carrera Obrero wrote:

 > Hello,

Hi,

 > I have stored images in a Oracle's BLOB field. I have tried to
 > display  them from Zope in a dtml-in method, but I can not show
 > them.
 >
 > Anybody knows to how do it ?

First of all, you must understand that html doesn't include it's 
displayed images inline in the source document it just puts a reference 
('<img src="some url">') telling your browser where it should fetch the 
image. Hence when you say <dtml-var some_image_object> it is actually 
asking some_image_object to output an <img src="..."> tag. This <img> 
tag would be useless if the 'src="..."' part didn't refer to a place 
that actually served the image.

Your <dtml-in> of BLOB fields is most likelly spewing a bunch of data in 
the html source of your document which your browser is rightfully not 
showing you as an image.

The solution to your problem is twofold:

   * find a way to query your database and return a list of <img 
src="..."> tags.

   * find a way to serve ONE image from the same URL you mentioned in 
the <img src="..."> above.

There are many aproaches to that, almost all involving the creation of 
Zope products, though maybe you can make do with a method to query the 
database and another method or script that gets an ID as a parameter and 
spews one image in return. Don't forget to set your 'Content-Type:' 
header in this method or script.

	Cheers, Leo