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import cx_Oracle

GrayGeek jkrepsBEAR at FISHneb.rr.com
Wed Nov 5 19:14:41 EST 2003 
Andy Todd wrote:

> GrayGeek wrote:
>> Waldemar Osuch wrote:
>> 
>> 
>>>GrayGeek <jkrepsBEAR at FISHneb.rr.com> wrote in message
>>>news:<PqDpb.109407$%C5.82494 at twister.rdc-kc.rr.com>...
>>>
>>>>Andy Todd wrote:
>>>>
>>>>
>>>>>GrayGeek wrote:
>>>>>
>>>>>
>>>>>>Uwe Hoffmann wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>GrayGeek wrote:
>>>>>>>
>>>>>>>
>>>>>>>>Bernard Delmée wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>>It gives me an error about being unable to find the OCISetDefault
>>>>>>>>>>entry point in 'oci.dll'.
>>>>>>>>>
>>>>>>>>>cx_Oracle works on top of the regular oracle client, which you'll
>>>>>>>>>need to install before it works. The OCI libraries are
>>>>>>>>>parOCISetDefault t of that.
>>>>>>>>
>>>>>>>>
>>>>>>>>I have it installed, and have used it to create webpages using
>>>>>>>>Oracle's HTP.P function, and I also accessed tables on the Oracle9
>>>>>>>>server from JDev9
>>>>>>>>and from PLSQLDeveloper.   The oci.dll is in the Oracle Home/dll
>>>>>>>>directory. As my first post indicated, cx_Oracle is able to see
>>>>>>>>oci.dll, it just can't communicate with it properly.
>>>>>>>>???
>>>>>>>
>>>>>>> i think that the binaries were built against another version of
>>>>>>> oracle. i had a similar problem with DCOracle2 (versions 8.0.5 vs.
>>>>>>> 8.1.7 or
>>>>>>>7.3.3 vs. 8.0.5).
>>>>>>> As far as i remember OCISetDefault was one of the problematic
>>>>>>> symbols.
>>>>>>
>>>>>>
>>>>>>I'm hoping that we can switch from Java to Python but since we are
>>>>>>standardizing on Oracle having a reliable Python connection to Oracle
>>>>>>9i is
>>>>>>important.   mmm... Maybe I can use PostgreSQL for a proof of
>>>>>>concept...
>>>>>
>>>>>Is $ORACLE_HOME/bin on your path? This is how cx_Oracle picks up the
>>>>>oci.dll. Its not necessary for the Oracle toolks like JDeveloper and
>>>>>SQL*Plus, but its essential for third party tools.
>>>>
>>>>Yes.  cx_Oracle has no problem finding oci.dll, it just can find the
>>>>right 'entry point'.
>>>>
>>>>
>>>>>You don't mention which version of Oracle you are using. There are
>>>>>binaries for either Oracle 8i or 9i with Python 2.2 on the home page
>>>>>(http://www.computronix.com/utilities.shtml#Oracle) but they won't work
>>>>>with earlier versions of Oracle. Although, with a bit of luck and a
>>>>>following wind the 8i binary can be used to access a 9i database (it
>>>>>just can't do anything with the new features). But on the whole you
>>>>>will be better off getting the appropriate driver for your database
>>>>>version.
>>>>
>>>>I started using Python 2.3 and when I ran into this problem my first
>>>>tack was to remove Python 2.3 and revert to Python 2.2, but Python 2.2
>>>>shows the
>>>>same problem.  We use both Oracle 8i and Oracle 9i.  I am attempting to
>>>>connect to my Oracle 9i database.  I have tried both binaries and the
>>>>"import cx_Oracle" dies in both using Python 2.2 against Oracle 9i.
>>>
>>>I had similar problem once on a machine with two Oracle installations.
>>>cx_Oracle was finding oci.dll all right but it was the wrong one.
>>>When I found a machine with only one version of Oracle the problem
>>>went away.
>>>After this hurdle was over I had nothing but positive impressions from
>>>using cx_Oracle module.
>>>
>>>waldemar
>> 
>> 
>> mmm... the only Oracle onnection on my box is for the 9i database.
>> 
> 
> So, just to clarify, on your Windows box you now have *only* Python 2.2
> and the Oracle 9i client? I'm presuming also that your database is on
> another machine. And you've installed the appropriate cx_Oracle binary?
> Works for me;

Your assumptions are correct.  But, it doesn't work for me.

> 
> PythonWin 2.2.1 (#34, Apr  9 2002, 19:34:33) [MSC 32 bit (Intel)] on
> win32. Portions Copyright 1994-2001 Mark Hammond
> (mhammond at skippinet.com.au) - see 'Help/About PythonWin' for further
> copyright information.
>  >>> import cx_Oracle
>  >>> cx_Oracle.version
> '3.1'
>  >>> db=cx_Oracle.connect('andy/andy at melchett')
>  >>> cursor=db.cursor()
>  >>> cursor.execute("SELECT user FROM dual")
> [<StringVar object at 0x012AAF08>]
>  >>> print cursor.fetchall()
> [('ANDY',)]
>  >>>
> 
> I also tried it with cx_Oracle version 2.5a, and then on my other
> machine with Python 2.3, the 9i client and version 3.0a of cx_Oracle.
> 
> So, my guess is that you are still suffering from a DLL confusion
> (somewhere).

Probably true, but JDev9 and  PSQLDeveloper doesn't have any connection
problems.
??

-- 

-
GrayGeek
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