On Fri, Jul 24, 2009 at 12:31:02PM +1200, Aaron Robinson wrote:
> if I set the value of a blob column by setting a
> varialbe on my object, it gets written to the db just fine, but when I do it
> inside a transaction using sqlbuilder I have the error. Please see the code
> below.
>
> Test Code:
>
> from sqlobject import *
> from array import *
>
> sqlhub.processConnection = connectionForURI('postgres://user:p...@localhost
> /mydb')
>
> class MyObject(SQLObject):
> myInt = IntCol(default=42)
> myBlob = BLOBCol(default=None)
>
> MyObject.createTable()
>
> #This works:
> myObject = MyObject()
> myObject.myInt = 43
> myObject.myBlob = array('H',range(256)).tostring()
I hope you know you can set many values at once:
myObject.set(myInt=43, myBlob=array('H',range(256)).tostring())
(That's offtopic, just a reminder.)
> #This doesn't work:
> record = {'my_int':44, 'my_blob':array('H',range(256)).tostring()}
> conn = sqlhub.getConnection()
> tx = conn.transaction()
> tx.query(conn.sqlrepr(sqlbuilder.Insert(MyObject, [record])))
> tx.commit()
>
> #psycopg2.DataError: invalid byte sequence for encoding "UTF8": 0x80
> #HINT: This error can also happen if the byte sequence does not match the
> encoding expected by the server, which is controlled by "client_encoding".
First, this has nothing with transactions. You can do conn.query() here.
Second, SQLBuilder... SQLObject is a high-level object that does a lot of
things internally, but SQLBuilder is a low-level interface that knows
nothing about classes, columns, column types, conversion; the first
parameters should be string (table name), the values must be converted to
the DB format; for a BLOB it means you have to use psycopg.Binary wrapper.
This code works for my in Postgres and SQLite:
record = {'my_int':44,
'my_blob':conn.createBinary(array('H',range(256)).tostring())}
conn.query(conn.sqlrepr(sqlbuilder.Insert(MyObject.sqlmeta.table, [record])))
Oleg.
--
Oleg Broytmann http://phd.pp.ru/ [email protected]
Programmers don't die, they just GOSUB without RETURN.
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