Re: Running cx_Oracle w/ Python 2.6.6

On Wed, Oct 28, 2015 at 10:41 AM, <[email protected]> wrote:

>
> I was asking on Friday about trying to get cx_Oracle built with Python
> version 2.6.6. Thank you, Shai and Anthony for your responses.
>
> So, Anthony said this:
>
> > One other issue that should be considered: if you are trying to use a
> > cx_Oracle built with the Python 2.6 you downloaded and built, but using
> the
> > system wide Python you may run into the difficulty you experienced. If,
> > however, you make sure that you build Python with the same configuration
> as
> > the system wide Python you should be good.
> >
> > If you run the system wide Python and print the value of sys.maxunicode
> you
> > should get 1114111 and if you run the one you built then you should get
> > 65535 (a different value).
> >
> > The option you want to the configure command when building Python is
> > --enable-unicode=ucs4.
> > Once you have enabled that on your personally built Python and confirmed
> > that running both gives the same value for sys.maxunicode you should be
> > good to go. :-)
> >
> > And even though I don't personally use Python 2.6 or test with it, there
> > shouldn't be any difficulties with using it yet; if there are, let me
> know.
>
> It's not exactly clear but there is sort of an implication here that you
> can build cx_Oracle 5.2 with Python 2.7 but run it with Python 2.6.6.
> I'm not sure if that's really what was meant, but it does not work.
> I got my own 2.7.10 build configured with the ucs4 flag and got
> cx_Oracle's setup.py to generate cleanly. When I tried to use the .so
> created , the unicode error was gone but then I got this in its place:
>
> >>> import cx_Oracle
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: ./cx_Oracle.so: undefined symbol: PyCapsule_Import
>
>
> So, if using 5.2 built with 2.7.10 from 2.6.6 is what you meant,
> then I am letting you know that there is
> a problem with running that (or at least the 2.6.6 that I
> have). If that's not what you meant, then nevermind. ;)
>

It wasn't what I meant. Apologies for the confusion!

>
> I decided to just back up to cx_Oracle 5.1.2, made my own custom build of
> python 2.6.6, "borrowed" its Include/ directory as I showed before, ran
> the gcc
> commands directly to generate the cx_Oracle.so. That then works with the
> system python 2.6.6!
>

Yes, and if you build cx_Oracle 5.2 with your custom build of Python 2.6.6
it should also work just fine -- unless I inadvertently broke Python 2.6 in
the last release, of course! :-)

>
> So, I am very thankful to have a module to be able to talk to Oracle with.
> I had used pyodbc to talk with MS SQL Server systems before, but for some
> reason I could never manage to get pyodbc to connect with this Oracle DB.
>
> Below is a couple of warnings (just FYI) from when I built 5.2 with my
> 2.7.10. They are just warnings, but its always nicer to get "warm
> fuzzies" as a user rather than "cold pricklies". I'm not sure if there
> is anything you can (or want to) change to make these warning going away,
> but here's the info in case you do:
>
> epjohn$ /home/epjohn/src/Python-2.7.10/python setup.py build
> running build
> running build_ext
> building 'cx_Oracle' extension
> creating build/temp.linux-x86_64-2.7-11g
> gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall
> -Wstrict-prototypes -fPIC
> -I/software/app/oracle/product/11.2.0Qv2/rdbms/demo
> -I/software/app/oracle/product/11.2.0Qv2/rdbms/public
> -I/home/epjohn/src/Python-2.7.10/Include -I/home/epjohn/src/Python-2.7.10
> -c cx_Oracle.c -o build/temp.linux-x86_64-2.7-11g/cx_Oracle.o
> -DBUILD_VERSION=5.2
> In file included from
> /software/app/oracle/product/11.2.0Qv2/rdbms/public/oci.h:3045,
>                  from cx_Oracle.c:10:
> /software/app/oracle/product/11.2.0Qv2/rdbms/public/ociap.h:10795:
> warning: function declaration isn't a prototype
> /software/app/oracle/product/11.2.0Qv2/rdbms/public/ociap.h:10801:
> warning: function declaration isn't a prototype
> creating build/lib.linux-x86_64-2.7-11g
> gcc -pthread -shared build/temp.linux-x86_64-2.7-11g/cx_Oracle.o
> -L/software/app/oracle/product/11.2.0Qv2/lib -lclntsh -o
> build/lib.linux-x86_64-2.7-11g/cx_Oracle.so
>

Those warnings are from the Oracle include files -- ones we don't control.
So nothing much I can do about it!

>
> Thank you for sharing your work for this module, Anthony!
>

You're welcome.

>
> Thanks again, Shai and Anthony, for your responses to my previous email.
>

You're welcome, again. :-)

Anthony

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