无法使用python 3.4连接到Oracle

Question

I just started to learn python and try to connect to oracle 11g, but I always get following error

cx_Oracle.InternalError: No Oracle error?

Here is my simple script to connect to oracle

import cx_Oracle as oracle
con = oracle.connect('user/password@ip:port/service')

Already try to look for any reference in other sites including here but can't find the solution. I don't think I have connection issue to oracle, because I use the same PC to connect to oracle using PHP. Any advise would be appreciated, thanks.

Answer 1

One thing to keep in mind anytime you work with Oracle is that they use a proprietary connection protocol TNS (Transparent Network Substrate). Therefore, you might need to use the cx_Oracle.makedsn(ip, port, SID) method and then pass it to cx_Oracle.connect() method to create your connection. Thus the general format on how to set up Oracle connection is:

import cx_Oracle

ip = 'xxx.xxx.xx.xxx'
port = 'xxxx'
SID = 'SID'
username = 'username'
password = 'password'

dsn_tns = cx_Oracle.makedsn(ip, port, SID)
db = cx_Oracle.connect(username, password, dsn_tns)

This is assuming you have already gotten cx_Oracle to work and import properly, which can be finicky depending on your environment.