Re: saving pdf's to the database
Re: saving pdf's to the database
- Subject: Re: saving pdf's to the database
- From: Tim Worman <email@hidden>
- Date: Wed, 23 Sep 2009 09:24:52 -0700
John:
Thanks for the response. In our case the files will always be pdf
since we are requiring that as the format of the originating user's
submission. I can definitely see the file size concern if the pdf is a
big ole glorified image. Hopefully, most of the users will produce
their pdf's by printing to pdf in mac os x (or acrobat on Windoze).
I already had a component class that takes plain text blobs (logs)
from the database, converts them to pdf, and presents them in a
browser window. That class doesn't work on the blobs where the file
was originated as pdf. So, I got concerned that maybe I was missing
something saving the NSData. My database saves blobs to the file
system so I tried reading one as a pdf and couldn't. Hence my question.
I've assumed that I should just be able create a response that simply
returns my NSData object and set the proper content-type. Am I on the
right track?
Thanks for your help.
Tim
On Sep 23, 2009, at 9:02 AM, John & Kim Larson wrote:
Hi Tim,
We do this all the time with receiving reports, prints, etc. Since
the component I use for upload handles any file type ( Word, images,
PDF) I keep track of the file extension that the file was uploaded
with in an attribute of my File entity. I then use that information
to reconstitute the mime type when either embedding or downloading
the file. There's not too much magic there, just a bunch of if
elses to get the mime type from the extension. I can try to help you
if that isn't enough info.
Another gotcha is to make sure that your file size doesn't exceed
the blob capacity. PDFs from text are fine, but if someone uploads a
high res scanned file as a PDF, you will get an error either upon
committing the change or upon trying to view the file.
JAL
John A. Larson
President
Precision Instruments, Inc.
Ph: 847-824-4194
Fax: 866-240-7104
Sent from my iPhone
On Sep 23, 2009, at 10:45 AM, Tim Worman <email@hidden> wrote:
WO'ers:
I am writing an application where users can upload pdf files -
which my app saves to the database. I also need to have mechanisms
in place where a "reviewer" can browse the documents that have been
uploaded. The upload and saving to the database seems to be
working. This is modeled as 'blob' and the class type is 'NSData.'
The files are uploaded via AjaxFileUpload.
I have saved plain text files to the database before but I'm
concerned that there is something more I need to do to save the pdf
files. Are there special considerations for maintaining the mime
type, continuity, etc. of these files before I save them as NSData
to the database? Also, I am not sure how to present the files to
the reviewer. I have converted text to pdf for viewing before but
I'm stuck on reconstituting a pdf for display.
If anyone has any pointers or code examples that would really help
me as I'm under a serious time crunch.
Tim
UCLA GSE&IS
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