pyodbc.Error 'IM002' connecting to DB2

问题

I downloaded Python 2.7 (python-2.7.1.amd64.msi) and pyodbc, the python extension module for connecting to DB2 database (i.e. pyodbc-2.1.8.win-amd64-py2.7.exe).

I wrote sample script as shown below.

import csv 
import pyodbc 
conn = pyodbc.connectpyodbc.connect('DRIVER={DB2};SERVER=localhost;DATABASE=DBT1;UID=scott;PWD=tiger;')  
curs = conn.cursor() 
curs.execute('select count(edokimp_id) from edokimp') 
print curs.fetchall()

The script throws following error

pyodbc.Error: ('IM002', '[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnectW)')

As I am a newbie to Python, I realized from the error that I need to download the IBM DB2 driver for pyodbc and hence searched extensively on Google but couldn't find any.

I would greatly appreciate if you could point me to the site where I can download the driver and later explain me how to configure/load the driver.

In case of Java

the driver will be shipped in the form of ojdbc.jar which will be copied to the lib directory which will be on classpath
make changes to configuration file
reference the DataSource from Java Class

I am newbie to Python so I would greatly appreciate if you could let me know cooresponding steps with an example in Python.

回答1:

You can get the PyDB2 driver on the project homepage.

If you run into compilation issues with the official Python, ActivePython is a good alternate distribution of Python on Windows.

Edit: If it asks you for DB2 headers, you need to get the IBM Data Server Client for ODBC and CLI.

回答2:

It does work using pyodbc. I think you have a wrong connection string. After some research and tests I solved with this code:

con = pyodbc.connect('DRIVER=iSeries Access ODBC Driver;SYSTEM=10.0.0.1;UID=bubi;PWD=xyz;DBQ=DEFAULTSCHEMA;EXTCOLINFO=1')
cur = con.cursor()
cur.execute('select * from MYTABLE')
row = cur.fetchone()
if row:
    field1 = row[0] 
    field2 = row[1]
# etc...

As you see it doesn't need a DSN to be configured on your system.

回答3:

This connection string for pyodbc, work for me:

conexion_str = 'SYSTEM=%s;db2:DSN=%s;UID=%s;PWD=%s;DRIVER=%s;' % (self._SYSTEM, self._DSN, self._UID, self._PWD, self._DRIVER)
self._cnn = pyodbc.connect(conexion_str)

来源：https://stackoverflow.com/questions/4452322/pyodbc-error-im002-connecting-to-db2

标签

python

db2

pyodbc