Hey guys, Here's an easy way to save >1m files without concern for the
filesize...code below is for PDF files, but you can change the content
type to whatever you want.
I over-commented for you... <grin>
Brian
class pdfFile( db.Model ):
#name of the file you are working with (not unique)
filename = db.StringProperty()
#time the file was uploaded
uploadedOn = db.DateTimeProperty(auto_now_add=True)
def storePDF( self, thePDF ):
# the pieceSize could be 1000000, but I gave 50k overhead for
good
measure
pieceSize = 950000
# loop to generate all the pieces
for i in range( 0, len( thePDF ), pieceSize ):
# get a new data record
thisPiece = pdfFilePart()
# the key keeps them together
thisPiece.pdfFile = self.key()
# the partNum keeps them in order
thisPiece.portionNum = i/pieceSize
# save this portion of the file to the blob
thisPiece.portion = thePDF[ i: i+pieceSize ]
# commit it
thisPiece.put()
def loadPDF( self ):
# the results will be in thePDF
thePDF = ''
# get all the pieces (remember that self will be the record you
are
working with)
q = db.GqlQuery("SELECT * FROM pdfFilePart WHERE pdfFile = :1
ORDER
BY portionNum", self.key() )
# technically, fetching 11 is fine because there's a 10 meg
limit
right now 950000 x 11 > 10 meg
results = q.fetch(11)
# cycle for each record retreived
for each in results:
# add this blob to the overall
thePDF += each.portion
# return the entire file
return thePDF
class pdfFilePart( db.Model ):
pdfFile = db.ReferenceProperty() # the key to the parent
portionNum = db.IntegerProperty() # the order of parts
portion = db.BlobProperty() # this portion of the
file
class test ( webapp.RequestHandler ):
def get(self):
# if "getFile" exists, then user had clicked to download the
file
if self.request.get('getFile'):
# get the key from the querystring, get that record
from pdfFile
and store it in theFile
theFile = pdfFile().get(
db.Key(self.request.get('getFile')) )
# tell browser this is a pdf file
self.response.headers['Content-Type'] =
"application/pdf"
# give browser the content of the file (
theFile.loadPDF() )
self.response.out.write( theFile.loadPDF( ) )
else:
# query for all the files we currently have
q = db.GqlQuery("SELECT * FROM pdfFile ORDER BY
uploadedOn")
# get those files
results = q.fetch(100)
# loop through each result
for each in results:
# give a link to the file (using the key) and
displaying the
filename (remember, filename is not unique...uniqueness is from key
() )
self.response.out.write('<h2><a
href="/test/?getFile=' + str
(each.key()) + '">' + each.filename + '</a></h2>')
# display a form to upload a file (pdfFile), and a
filename (just
to allow you to identify the file...a non-unique filename)
self.response.out.write("""<form action="/test/"
enctype="multipart/
form-data" accept-charset="utf-8" accept="application/pdf"
method="post">
<input type="hidden" name="cmd"
value="uploadPDF">
<table>
<tr><td>PDF
File:</td><td><input name="pdfFile" type="file"
size="70"></td></tr>
<tr><td>Filename:</td><td><input type="textbox" name="title"
size="70"></td></tr>
<tr><td colspan=2><input
type="submit" value="upload"></td></tr>
</table></form>""")
def post(self):
# the file was posted so get a record ready
theFile = pdfFile()
# set the filename
theFile.filename = self.request.get('title')
# putting it gives the record a KEY so we can move on to the
next
stage
theFile.put()
# save the portion(s) of the file by giving the entire file to
storePDF
theFile.storePDF( self.request.get('pdfFile') )
# go back to the get...as opposed to self.redirect('/')
self.get()
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