[Zope-DB] retrieving images from MySQL

Bobb rawbobb at hotmail.com
Fri Jun 11 13:46:32 EDT 2004

This is how we do it (one way, anyway) ...

zsql method (called sqllogo)

select logo from table where id=<dtml-sqlvar id type=int>

python script (called logo)

result = []
lob = ['image']
for row in context.sqllogo(id=id):
  lob = row['logo']
#  result.append({'image': lob.read()})
# above was remmed
container.REQUEST.RESPONSE.setHeader('content-type', 'image/jpeg')
return lob

dtml method snip...

<td valign="top"><input type="image" src="logo?id=<dtml-var id>"


----- Original Message -----
From: "Lila Klektau" <lmk at uvic.ca>
To: <zope-db at zope.org>
Sent: Wednesday, June 02, 2004 3:04 PM
Subject: [Zope-DB] retrieving images from MySQL

I am attempting to retrieve a jpeg image I placed in a LONGBLOB field of a
MySQL database.  I have all the correct packages installed in Zope to
connect to a MySQL database, and the connection is successful - I am able
to get text information out of the database.  I have followed the
instructions listed in the MySQL HowTo by murphy
(http://www.zope.org/Members/murphy/MySQL-BLOBs), to retrieve images, but
I can't seem to get the image to display.

The image was placed in the database using a perl script.  Attempting to
retrieve it using PHP is successful, so I assume that the uploading part
of the process is correct.

To retrieve it in Zope, I am doing the following:

I have a Z SQL Method called get_grid_map which is as follows (note there
is only one column in this table):

     SELECT time,map FROM status_map

I then have a python script called create_grid_map, to execute the Z SQL

     result = context.get_grid_map()
     container.REQUEST.RESPONSE.setHeader('content-type', 'image/JPEG')
     return result[0].map

Trying to view the script results in the following error:

     The image
“http://yamon.phys.uvic.ca:8080/gridCanada/gridX1/create_grid_map” cannot
be displayed, because it contains errors.

I have thought maybe an image tag in another file was necessary, but
placing the image tag <img src="create_grid_map"> in dtml, page_template,
and plain html documents all result in a broken image.

One thing I notice that is suspicious is that when I view the result of
testing my SQL statement, the image contents are "array('c','--binary
image data--'), where --binary image data-- is just a lot of binary
stuff.  I'm wondering where the array part is coming from, and if that
could be my problem.  When I tried verifying things in PHP and created a
file from the database contents, there was no array string prefixed and
the file displayed correctly.

Any help would be very much appreciated.  Thanks!


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