Well, I think you need to import BLOB from dialects like:
from sqlalchemy.dialects.oracle import BLOB in your Model you can describe the field type following it: MyBLOBColumn = Column(BLOB) Actually, IMHO i don't think saving large contents (binary from binary files) as pure text in the database is the best option. 2013/2/26 dalia <dalia....@gmail.com> > Hi, > > My intention is - to store .xls, .doc and .pdf files (with images in them) > to store in a Oracle database and retrieve them. I'm using SQLAlchemy > declarative code. The problem is, the data gets stored in the database but > when I try to fetch the data back, it comes out as 0KB. I'm explaining the > code and actions below - > > The model - > > class ReportFiles(Base): > __tablename__ = 'report_files' > id = Column(Integer, primary_key=True) > report_file = Column(BLOB) > file_name = Column(Unicode(50)) > > > Storing in database - > > content = cStringIO.StringIO() > def store_in_db(): > session = meta.Session() > self._get_file(content) ### This is a function which generates the > file (.xls / .doc / .pdf) in the content > contentstr = content.getvalue() > tbl = model.ReportFiles() > tbl.file_name = "test file" > tbl.report_file = contentstr > session.add(tbl) > session.commit() > > After the store, if I query the database, I get this result - not sure if > it has stored alright - > > select file_name, length(report_file) from report_files; > > Name | Length > -------------------------- > test file | 5632 > > select file_name, report_file from report_files; > > Name | file > ------------------ > test file | (BLOB) > > This doesn't look right because instead of the file, it just shows (BLOB) > > Retrieving from database - now I want the file to be downloaded as an > excel (.xls) file > > def _get_report(self): > tbl = model.ReportFiles > file = meta.Session.query(tbl).get(id=1) > contentstr = file.report_file > response.content_type = 'application/vnd.ms-excel; charset=utf-8' > response.headers['Content-disposition'] = 'attachment; filename = %s' > %file.file_name > response.content_length = len(contentstr) > print "Length = %s" %len(contentstr) > return contentstr > > > This downloads the .xls file fine. The print statement prints the file > size as 5632. The download dialogue says the file size is 5.5KB. But when I > open the file, it says 'file type not in right format'. When I open it in > notepad, it is a 0 KB file. When I list the file in the directory, it is a > 0KB file. > > Can somebody please tell me what is wrong here? Looks like the file > doesn't get stored properly? Or am I missing something obvious? Or do I > need to handle BLOB types differently? > > Many Thanks. > > > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- *Mauricio de Abreu Antunes* Mobile: (51)930-74-525 Skype: mauricio.abreua -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
