How to read image in blob format from a existing db

[Chris]

Hi, i’m trying to read images from a existing sqlite db. For some reason when i save the images to disk, they are corrupted.

this is my code:

cherry_db = DAL('sqlite://{}'.format(form.vars.cherry_file), folder=upload_folder, migrate=False)

cherry_db.define_table('image',

    Field('node_id', 'integer', requires=IS_NOT_EMPTY()),

    Field('png', 'blob')

    )

images = cherry_db(cherry_db.image.node_id == i['node_id']).select(cherry_db.image.node_id, cherry_db.image.png)

for m in images:

   name = str(uuid.uuid4())

   print('image {}'.format(name))

   print(m['png'])

   im = open('{}'.format(session.project_folder+'/'+name+'.png'), 'wb')

   im.write(m['png'])

   im.close()

Any help is appreciated

Cheers.

Chris.

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[Kevin Keller]

I think you have to convert the image file to binary data before saving tad blob etc..?

https://pynative.com/python-mysql-blob-insert-retrieve-file-image-as-a-blob-in-mysql/

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[Chris]

Data is already in binary in db.

Making more test when pydal retrieve the blob data from the db is only getting just a part of the information.

When in print the rows after the select i get a small sample like this:

images = cherry_db(cherry_db.image.node_id == i['node_id']).select(cherry_db.image.node_id, cherry_db.image.png)

for m in images:

   print(m['png’])

b'<\xd1\x88\x1c4l\x04\x84\xce 0\x13\xc6\x01\r\xdd\xd0'

Cheers

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[Chris]

I could do it with pydal but with sqlite3 library worked perfect. Is maybe a pydal bug ?

Cheers.

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[Kevin Keller]

Potentially. I woukd file a problem in github and use raw sql as workaround for now.

Adding the py4web community to this....

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[Kevin Keller]

I filed a bug report for this on the pydal and py4web repo.