how do you connect to oracle using pyodbc

Question

I am trying to connect to Oracle db using pyodbc, getting errors. The examples include ms sql server driver:

in my /etc/unixODBC/odbc.ini, I have this entry:

[test_con]
Driver=Oracle
Description=data repository db
Trace=Yes
ServerName=//db1.example.com:1521/db2_svc1


import pyodbc
cnxn=pyodbc.connect('DSN=test_con, UID=user_id, PWD=passwd123')

I get this error:

pyodbc.Error: ('IM012', '[IM012] [unixODBC][Driver Manager]DRIVER keyword syntax error (0) (SQLDriverConnect)')

Answer 1

I came here looking for an answer to this question, but instead found an answer elsewhere to a more general question that I'd like to share. You can very simply connect to an Oracle db without pyodbc, using the cx_Oracle library. Check out the installation instructions below:

https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html

Starter code below:

cx_Oracle.init_oracle_client(lib_dir=r"C:\oracle\instantclient_19_10")

connection = cx_Oracle.connect(
user="username",
password="password",
dsn="address")

cursor = connection.cursor()

Answer 2

pyodbc maintainer did an excellent job at documenting how to install Oracle ODBC driver and then how to connect to the database. It worked for me: https://github.com/mkleehammer/pyodbc/wiki/Connecting-to-Oracle-from-RHEL-or-Centos

Answer 3

The code below is for mssql on Mac OS and it assumes that you installed unixODBC using:

$ brew install freetds --with-unixodbc

and that you have edited the two odbc config files:

1. /usr/local/Cellar/unixodbc/2.3.2_1/etc/odbcinst.ini

   [FreeTDS]

   Description=FreeTDS Driver for Linux & MSSQL on MacOS

   Driver=/usr/local/Cellar/freetds/0.95.80/lib/libtdsodbc.0.so

   Setup=/usr/local/Cellar/freetds/0.95.80/lib/libtdsodbc.0.so

   FileUsage=1

2. Edit ~/Library/ODBC/odbc.ini

   [sql_server]

   Driver=FreeTDS

   Server=put_ip_here

   Port=1433

== Code:

import pyodbc

connection_string = "Driver={{FreeTDS}};Server={};"\
"Database={};UID={};PWD={};"\
.format(db_host, db_name, db_user, db_password)

with pyodbc.connect(connection_string) as db:
    cursor = db.cursor()

    cursor.execute("SELECT count(*) FROM aTable")
    ...

Answer 4

The reply has been late but can be useful for future reader.

Install:

• oracle-instantclient12.2-basic-12.2.0.1.0-1.x86_64.rpm
• oracle-instantclient12.2-odbc-12.2.0.1.0-2.x86_64.rpm

From: http://www.oracle.com/technetwork/topics/linuxx86-64soft-092277.html

sudo rpm -Uvh oracle-instantclient12.2-*

set ORACLE_HOME and LD_LIBRARY_PATH

export ORACLE_HOME=/usr/lib/oracle/12.2/client64
export LD_LIBRARY_PATH=/usr/lib/oracle/12.2/client64/lib

In /etc/odbcinst.ini set:

[Oracle_test]
Description=Oracle ODBC driver for Oracle 12c
Driver=/usr/lib/oracle/12.2/client64/lib/libsqora.so.12.1
FileUsage=1
Driver Logging=7
UsageCount=1

In Python shell:

>>> import pyodbc
>>> conn = pyodbc.connect('DRIVER={Oracle_test};Host=1.1.1.1;Port=1521;Service Name=orcl.local;User ID=test1;Password=test1')
>>> print(conn)
<pyodbc.Connection object at 0x7f6acb2c4c00> 

Hopefully it helps someone.

PS: You can also set the driver in /etc/ld.so.conf as

/usr/lib/oracle/12.2/client64/lib

Run: ldconfig

Answer 5

Try something like:

import pyodbc
connectString = 'Driver={Microdsoft ODBC for Oracle};Server=<host>:<port>/<db>.<host>;uid= <username>;pwd=<password>'
cnxn = pyodbc.connect(connectString)

Read some docs ;) https://sites.google.com/site/bcgeopython/examples/getting-the-pyodbc-module