python导入错误cx_Oracle在macOS Sierra中

Question

I have macOS Sierra 10.12.3, and I need to connect to an Oracle database through python. I installed cx_Oracle following these instructions , using pip. I get the following error message when importing cx_Oracle in ipython (Python 3.5.2 |Anaconda 4.2.0 (x86_64)):

In [1]: import cx_Oracle
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-d1ecebcba3d2> in <module>()
----> 1 import cx_Oracle

ImportError: dlopen(/Users/dufoudav/anaconda/lib/python3.5/site-packages/cx_Oracle.cpython-35m-darwin.so, 2): Library not loaded: @rpath/libclntsh.dylib.12.1
    Referenced from: /Users/dufoudav/anaconda/lib/python3.5/site-packages/cx_Oracle.cpython-35m-darwin.so
        Reason: image not found

Any ideas of how to solve this?

Answer 1

Installing cx_Oracle for Python/ Mac OS Sierra

Download the following files from Oracle

instantclient-basic-macos.x64-12.1.0.2.0.zip instantclient-sdk-macos.x64-12.1.0.2.0.zip

• instantclient-basic-$VERSION-macosx-x64.zip
• instantclient-sdk-$VERSION-macosx-x64.zip

Create a directory /usr/local/lib/share/oracle

export ORACLE_HOME=/usr/local/lib/share/oracle
export VERSION=12.1.0.2.0
export ARCH=x86_64

mkdir -p $ORACLE_HOME

Copy Instant Client Basic & SDK to /usr/local/lib/share/oracle

cp instantclient-basic-macos.x64-$VERSION.zip $ORACLE_HOME
cp instantclient-sdk-macos.x64-$VERSION.zip $ORACLE_HOME

Unpack both files to that directory:

cd $ORACLE_HOME
tar -xzf instantclient-basic-macos.x64-$VERSION.zip
tar -xzf instantclient-sdk-macos.x64-$VERSION.zip

Create Symbolic links in the instant client folder in /user/local/lib/share/oracle

cd instantclient_12_1
ln -s libclntsh.dylib.12.1 libclntsh.dylib
ln -s libocci.dylib.12.1 libocci.dylib

export DYLD_LIBRARY_PATH=$ORACLE_HOME
export LD_LIBRARY_PATH=$ORACLE_HOME

now you can get rid of the zip files you downloaded as they aren't needed anymore

cd /usr/local/lib/share/oracle
rm instantclient-basic-macos.x64-$VERSION.zip
rm instantclient-sdk-macos.x64-$VERSION.zip

move all the files & folders outside of /instantclient_12_1 to the parent directory /usr/local/lib/share/oracle

mv  -v $ORACLE_HOME/instantclient_12_1/* /$ORACLE_HOME/
rm -rf instantclient_12_1/

You should be able to install cx_Oracle now.

Troubleshooting

If you're experiencing cx_Oracle.DatabaseError: ORA-21561: OID generation failed Get the hostname of your computer by typing in terminal

hostname

copy this value and add it to your /etc/hosts file with your favorite text editor(i'm using vi in this case)

vi /etc/hosts

on the line that has 127.0.0.1 localhost at the end of it put a space and enter your hostname given to you earlier. below, you see MYMACSNAME, replace that portion with your hostname you received

127.0.0.1       localhost MYMACSNAME