# - This import requires appropriate oraocciXX.dll to be available in PATH (on windows)
# (Probably LD_LIBRARY_PATH or LD_LIBRARY_PATH64 on POSIX)
# where XX is the oracle DB version, e.g. oraocci11.dll for Oracle 11g.
# - This dll is part of the Oracle Instant client pkg available here:
# http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html
# - Also ensure that python, cx_Oracle and Oracle Client are of same arch (32 or 64-bit)
#
import cx_Oracle
You can find out arch (32 or 64-bit) for:
- python by just running the python in interactive mode on command line.
- cx_Oracle: look at the name of downloaded file.
- Oracle Client:
- run the sqlplus that’s part of your client package
- start Task Manager and see if sqlplus.exe has “*32” next to it (=32 bit) or not (=64 bit)
- if you don’t have sqlplus, use
dumpbin /headers oraocciXX.dll
- If you’re using POSIX you probably would already know. Use
file oraocciXX.so
Finally if you still don’t understand here is really for dummies instructions:
- Ensure you’ve installed 32-bit versions of python, cx_Oracle and Oracle Instant Client. These could also be 64-bit, but must be same for all 3. Can not mix and match. Links:
- Oracle Instant Client Lets say it’s installed in
C:\ProgFiles\OraClient\11_2
- cx_Oracle
- Python
- Oracle Instant Client Lets say it’s installed in
- Windows:
set PATH=%PATH%;C:\ProgFiles\OraClient\11_2
- POSIX (Linux/Unix/Solaris…) <– Untested..
export LD_LIBRARY_PATH=/path/to/your/32bit/oraocciXX.so
- (64 bit)
export LD_LIBRARY_PATH64=/path/to/your/64bit/oraocciXX.so
- run
path-to-python/python.exe -c "import cx_Oracle"
to test whether your setup is working or not.- if it prints
- nothing: then it’s successful.
ImportError: DLL load failed: The specified module could not be found
: then oraocciXX is not found. Setup the env vars correctly.ImportError: DLL load failed: %1 is not a valid Win32 application
: You have a 32/64 bit mismatch.