def _open(self, name, mode='rb'):
"""Open a file from database.
@param name filename or relative path to file based on base_url. path should contain only "/", but not "\". Apache sends pathes with "/".
If there is no such file in the db, returs None
"""
assert mode == 'rb', "You've tried to open binary file without specifying binary mode! You specified: %s"%mode
row = self.cursor.execute("SELECT %s from %s where %s = '%s'"%(self.blob_column,self.db_table,self.fname_column,name) ).fetchone()
if row is None:
return None
inMemFile = BytesIO(row[0])
inMemFile.name = name
inMemFile.mode = mode
retFile = File(inMemFile)
return retFile
