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Asked: 2026-05-12T22:41:30+00:00

I’m trying to install the cx_Oracle for Python 2.6, but it is failing. I

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I’m trying to install the cx_Oracle for Python 2.6, but it is failing. I don’t know enough about C or MS Vis. Studio’s compiler to even approach fixing it myself.

This is what is output on the command line: 

C:\pydev\cx_Oracle-5.0.1>C:\python26\python setup.py install
running install
running build
running build_ext
building 'cx_Oracle' extension
C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe /c /nologo /Ox /MD /W3 /GS- /DNDEBUG -IC:\Oracle\instantclient\sdk\include -IC:\p
ython26\include -IC:\python26\PC /Tccx_Oracle.c /Fobuild\temp.win32-2.6-11g\Release\cx_Oracle.obj -DBUILD_VERSION=5.0.1
cx_Oracle.c
c:\pydev\cx_oracle-5.0.1\StringVar.c(392) : warning C4018: '>' : signed/unsigned mismatch
c:\pydev\cx_oracle-5.0.1\StringVar.c(417) : warning C4018: '>' : signed/unsigned mismatch
c:\pydev\cx_oracle-5.0.1\ObjectVar.c(117) : warning C4018: '<' : signed/unsigned mismatch
c:\pydev\cx_oracle-5.0.1\ObjectVar.c(134) : warning C4018: '<' : signed/unsigned mismatch
c:\pydev\cx_oracle-5.0.1\Variable.c(331) : error C2036: 'void *' : unknown size
c:\pydev\cx_oracle-5.0.1\Variable.c(878) : warning C4244: '=' : conversion from 'sb2' to 'sb1', possible loss of data
c:\pydev\cx_oracle-5.0.1\Variable.c(914) : warning C4018: '<' : signed/unsigned mismatch
error: command '"C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe"' failed with exit status 2

Does anyone have any idea how to fix this?
(I also may have an issue with that cl.exe file, I think I remember seeing this as a problem somewhere else, but I have four Windows machines which could have had issue there.).

—————————– EDIT —————————–

The reason I do not use the pre-compiled installer is because when I try to run the module I get the following:

    Python 2.6.3 (r263rc1:75186, Oct  2 2009, 20:40:30) [MSC v.1500 32 bit (Intel)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import cx_Oracle
    Traceback (most recent call last):
      File "", line 1, in 
    ImportError: DLL load failed: The specified module could not be found.

I assume that means that it has not been properly installed. If someone can tell me what I did wrong here, that would also be a perfectly acceptable answer.

—————————– EDIT2 —————————–

I have retrieved all files from Oracle’s Basic Client version 11.1.0.7. I have not tried installing a more substantial client. I am downloading one now.

%ORACLE_HOME%=C:\Oracle\instantclient\ #The directory where the above files have been extracted.

More information

  • The current directory for the cx_Oracle’s setup.py is C:\pydev\cx_Oracle-5.0.1
  • The version of Python is 2.6.3
  • The current directory for Python is C:\Python26 — to access python 2.6 -> type py26 on the command line and it will map to C:\python26\python
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1 Answer

  1. Editorial Team

    Why don’t you use a binary package like Windows Installer (Oracle 10g, Python 2.6)?

    See http://cx-oracle.sourceforge.net/ for other binary packages

    Addendum (as requested): you must ensure to use the cx_Oracle that :

    • set ORACLE_HOME if this environment variable doesn’t exist (see this Oracle FAQ)
    • python can find oraocci11.dll for Oracle 11g, oraocci10.dll for Oracle 10g or oraclient9.dll for Oracle 9i by adding the folder (should be %ORACLE_HOME%/bin) where the DLL is in you PATH environment variable
    • use the correct binary package (i.e. built for the right Python/Oracle versions)
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