cx-oracle-users

[cx-oracle-users] Segmentation fault with custom cursor

[<wa...@li...>]

I'm having problems with implementing custom cursors.
A minimal failing example is this:

from cx_Oracle import *

class Cursor2(Cursor):
    pass

class Connection2(Connection):
    def cursor(self):
       return Cursor2()

db = Connection2("...")
c = db.cursor()

Executing this gives me a Segmentation fault. I'm on Linux using
cx_Oracle 4.0.1 with Anthony's patch for the NVARCHAR/UTF16 problem.

Bye,
    Walter Dörwald

Re: [cx-oracle-users] Segmentation fault with custom cursor

[Anthony T. <an...@co...>]

I am on vacation right now so I can't test this myself. Perhaps you 
could try it with the shipping cx_Oracle as well? Just before I left on 
vacation I received an e-mail from someone with respect to the patch you 
mention -- I am thinking of reversing it as a result of that e-mail as 
it turns out that the problem is an Oracle bug and the issues I 
discussed with you (about unicode and the like) are much worse than I 
imagined. I'll get back to you with some more information when I return 
(first week of August).

Walter Dörwald wrote:

> I'm having problems with implementing custom cursors.
> A minimal failing example is this:
> 
> from cx_Oracle import *
> 
> class Cursor2(Cursor):
>    pass
> 
> class Connection2(Connection):
>    def cursor(self):
>       return Cursor2()
> 
> db = Connection2("...")
> c = db.cursor()
> 
> Executing this gives me a Segmentation fault. I'm on Linux using
> cx_Oracle 4.0.1 with Anthony's patch for the NVARCHAR/UTF16 problem.
> 
> Bye,
>    Walter Dörwald
> 
> 
> 
> 
> -------------------------------------------------------
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Re: [cx-oracle-users] Segmentation fault with custom cursor

[<wa...@li...>]

Anthony Tuininga wrote:

> I am on vacation right now so I can't test this myself. Perhaps you 
> could try it with the shipping cx_Oracle as well?

I reinstalled the release version of cx_Oracle 4.0.1 and it still gives
me a segmentation fault.

> Just before I left on 
> vacation I received an e-mail from someone with respect to the patch you 
> mention -- I am thinking of reversing it as a result of that e-mail as 
> it turns out that the problem is an Oracle bug

Do we have any change of getting this bug fixed?

> and the issues I 
> discussed with you (about unicode and the like) are much worse than I 
> imagined. I'll get back to you with some more information when I return 
> (first week of August).

OK!

Bye,
    Walter Dörwald

Re: [cx-oracle-users] Segmentation fault with custom cursor

[Anthony T. <an...@co...>]

Ok, I should have looked at this a little more closely a little sooner, 
such as before I released 4.1 beta1 :-) The problem with your code is 
that you need to pass the connection through to the constructor of the 
cursor. Failing to do so does in fact yield a segfault which I have 
fixed and that fix will be included in 4.1 final when it is released. If 
you have any further questions, fire away. :-)

Walter Dörwald wrote:
> I'm having problems with implementing custom cursors.
> A minimal failing example is this:
> 
> from cx_Oracle import *
> 
> class Cursor2(Cursor):
>    pass
> 
> class Connection2(Connection):
>    def cursor(self):
>       return Cursor2()
> 
> db = Connection2("...")
> c = db.cursor()
> 
> Executing this gives me a Segmentation fault. I'm on Linux using
> cx_Oracle 4.0.1 with Anthony's patch for the NVARCHAR/UTF16 problem.
> 
> Bye,
>    Walter Dörwald
> 
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by BEA Weblogic Workshop
> FREE Java Enterprise J2EE developer tools!
> Get your free copy of BEA WebLogic Workshop 8.1 today.
> http://ads.osdn.com/?ad_id=4721&alloc_id=10040&op=click
> _______________________________________________
> cx-oracle-users mailing list
> cx-...@li...
> https://lists.sourceforge.net/lists/listinfo/cx-oracle-users

-- 
Anthony Tuininga
an...@co...

Computronix
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http://www.computronix.com

Re: [cx-oracle-users] Segmentation fault with custom cursor

[<wa...@li...>]

Anthony Tuininga wrote:

> Ok, I should have looked at this a little more closely a little sooner, 
> such as before I released 4.1 beta1 :-) The problem with your code is 
> that you need to pass the connection through to the constructor of the 
> cursor.

OK, with the change:
class Connection2(Connection):
    def cursor(self):
       return Cursor2(self)
it works.

> Failing to do so does in fact yield a segfault which I have 
> fixed and that fix will be included in 4.1 final when it is released. If 
> you have any further questions, fire away. :-)

Everything's working fine now.

Servus,
    Walter