Sybase module 0.37pre1 released

Dave Cole djc at object-craft.com.au
Sat Mar 19 04:59:45 CET 2005


WHAT IS IT:

The Sybase module provides a Python interface to the Sybase relational
database system.  It supports all of the Python Database API, version
2.0 with extensions.

NOTES:

This release contains a number of small bugfixes and patches received
from users.

I have been unable to find the source of the memory leak reported here:
 
http://www.object-craft.com.au/pipermail/python-sybase/2004-December/000346.html

The test program I wrote follows:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
import sys
import Sybase

db = Sybase.connect(..., auto_commit=True)
db.execute('''
if exists (select name from sysobjects where name = "sp_test_leak")
begin
     drop procedure sp_test_leak
end
''')
db.execute('''
create procedure sp_test_leak
     @arg int
as
     select @arg
''')
for i in range(200):
     for j in range(1000):
         c = db.cursor()
         c.callproc('sp_test_leak', {'@arg': 12345 })
     sys.stdout.write('%3d\r' % i)
     sys.stdout.flush()
sys.stdout.write('\n')
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

If someone is able to modify this and come up with a leaking result I
am interested in working on the fix.

You can build for FreeTDS like this:

      python setup.py build_ext -D HAVE_FREETDS -U WANT_BULKCOPY
      python setup.py install


The module is available here:

 
http://www.object-craft.com.au/projects/sybase/download/sybase-0.37pre1.tar.gz

The module home page is here:

     http://www.object-craft.com.au/projects/sybase/

CHANGES SINCE 0.36:

* Cursor output parameters now work when parameters are passed as a
   sequence.

* Output parameters now work for FreeTDS 0.62.4.

     1> create procedure sp_test_output
     2>     @num int, @result int output
     3> as
     4>     select @result = @num
     5> go

     params = c.callproc('sp_test_output', {'@num': 12345,
                                            '@result': Sybase.OUTPUT(1)})
     print params['@result']

* The CS_STATUS_RESULT result set is now consumed internally in the
   Cursor and does not appear in the result sets consumed by the fetch
   and nextset methods.

   The return value from the stored procedure is available in the
   .return_status member of the Cursor.  It will only contain a
   meaningful value once all of the row result sets have been consumed.

   Note that this does not work with FreeTDS 0.62.4.  The return_status
   seems to always be 0.  Research shows that the problem is probably
   in the CT emulation layer as tsql displays the correct value, but
   sqsh displays 0.

* Output hook patch from Ty Sarna has been applied.

* Applied patch from Andre Sedinin to improve error handling.

* Improved detection of SYBASE_OCS.

- Dave

-- 
http://www.object-craft.com.au



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