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Python DBI driver for DB2 (LUW, zOS, i5) and IDS

Project description

Python support for IBM DB2 and IBM Informix

Build Status

Python, DB-API components for IBM DB2 and Informix

Provides Python interface for connecting to IBM DB2 and Informix

Table of contents

Components

Pre-requisites

Installation

Quick Example

API Documentation

Downloads

Latest Updates

Support & Feedback

Contributing to the ibm_db python project

Some common issues

Testing

Components

  1. The ibm_db contains:
    • ibm_db driver: Python driver for IBM DB2 and IBM Informix databases. Uses the IBM Data Server Driver for ODBC and CLI APIs to connect to IBM DB2 and Informix.
    • ibm_db_dbi: Python driver for IBM DB2 and IBM Informix databases that complies to the DB-API 2.0 specification. Checkout the README for getting started with ibm_db and ibm_db_dbi

Pre-requisites

Install Python 2.7 or Python 3 <= 3.9. The minimum python version supported by driver is python 2.7 and the latest version supported is python 3.9 except version 3.3 as it has reached end-of-life.

The pre-built 32-bit and 64-bit binaries on windows are available for the following versions:

python 2.7
python 3.4
python 3.5
python 3.6
python 3.7
python 3.8
python 3.9
python 3.10

You might need zlib, openssl, pip installations if not already available in your setup.

  • Z/OS: In case of any issues using Python on zO/S, refer to this file and also refer to this doc.

  • Linux/Unix: If you face problems due to missing python header files while installing the driver, you would need to install python developer package and retry install. e.g:

    zypper install python-devel
     or
    yum install python-devel
  • MAC OS: Db2 V11.5.4 clidriver is built with GCC version 8.4.0 and hence you may need to upgrade to this version if you face problems due to old version of the GCC compiler in your environment while loading the ibm_db library.

  • For installing ibm_db on Docker Linux container, you may need to install gcc, python, pip, python-devel, libxml2 and pam if not already installed. Refer to Installation for more details.

Installation

You can install the driver using pip as:

pip install ibm_db

This will install ibm_db and ibm_db_dbi module.

If you are using python 3.8 or 3.9 on windows and building the source manually, you will need to set dll path of dependent library of clidriver before importing the module as:

import os
os.add_dll_directory('path to clidriver installation until bin')

e.g:
os.add_dll_directory('C:\Program Files\IBM\CLIDRIVER\\bin')

Refer https://bugs.python.org/issue36085 for more details.

  • For installing ibm_db on docker Linux container, you can refer as below:
yum install python gcc pam wget python-devel.x86_64 libxml2
use, `yum install python3` to install python 3.x

if pip or pip3 does not exist, install it as:
wget https://bootstrap.pypa.io/get-pip.py
docker cp get-pip.py /root:<containerid>
cd root
python2 get-pip.py or python3 get-pip.py

Install python ibm_db as:
pip install ibm_db
or
pip3 install ibm_db

  • Uninstalling the ibm_db driver :
pip uninstall ibm_db

The ODBC and CLI Driver(clidriver) is automatically downloaded at the time of installation and it is recommended to use this driver. However, if you wish to use an existing installation of clidriver or install the clidriver manually and use it, you can set IBM_DB_HOME environment variable. For more information on how to set this variable, refer Environment Variables section.

  • Environment Variables: IBM_DB_HOME :

    Set this environment variable to avoid automatic downloading of the clidriver during installation. You could set this to the installation path of ODBC and CLI driver in your environment.
    e.g:

    Windows :
    set IBM_DB_HOME=c:/Users/skauser/clidriver
    
    Other platforms:
    export IBM_DB_HOME=/home/skauser/clidriver
    

    You are required to set the library path to the clidriver under IBM_DB_HOME to pick this version of the ODBC and CLI Driver.
    e.g:

    Windows:
    set LIB=%IBM_DB_HOME%/lib;%LIB%
    
    AIX:
    export LIBPATH=$IBM_DB_HOME/lib:$LIBPATH
    
    MAC:
    export DYLD_LIBRARY_PATH=$IBM_DB_HOME/lib:$DYLD_LIBRARY_PATH
    
    Other platforms:
    export LD_LIBRARY_PATH=$IBM_DB_HOME/lib:$LD_LIBRARY_PATH
    

    The ODBC and CLI driver is available for download at Db2 LUW ODBC and CLI Driver. Refer to (License requirements) for more details on the CLI driver for manual download and installation.

  • Installing using Anaconda distribution of python

conda install -c conda-forge ibm_db
  • Supported Platform for Anaconda Installation
Platform Architecture Supported Version
Linux amd64 (x86_64) Yes Latest
Linux ppc64le Yes Latest
Darwin Mac OS Yes Latest
Windows x64 Yes Latest
Windows x32 Yes Latest

Quick Example

$ python
Python 3.6.5 (default, May 10 2018, 00:54:55)
[GCC 4.3.4 [gcc-4_3-branch revision 152973]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ibm_db
>>> #For connecting to local database named pydev for user db2inst1 and password secret, use below example
>>> #ibm_db_conn = ibm_db.connect('pydev', 'db2inst1', 'secret')
>>> #For connecting to remote database named pydev for uid db2inst and pwd secret on host host.test.com, use below example
>>> # Connect using ibm_db
>>> conn_str='database=pydev;hostname=host.test.com;port=portno;protocol=tcpip;uid=db2inst1;pwd=secret'
>>> ibm_db_conn = ibm_db.connect(conn_str,'','')
>>>
>>> # Connect using ibm_db_dbi
>>> import ibm_db_dbi
>>> conn = ibm_db_dbi.Connection(ibm_db_conn)
>>> # create table using ibm_db
>>> create="create table mytable(id int, name varchar(50))"
>>> ibm_db.exec_immediate(ibm_db_conn, create)
<ibm_db.IBM_DBStatement object at 0x7fcc5f44f650>
>>>
>>> # Execute tables API
>>> conn.tables('DB2INST1', '%')
[{'TABLE_CAT': None, 'TABLE_SCHEM': 'DB2INST1', 'TABLE_NAME': 'MYTABLE', 'TABLE_TYPE': 'TABLE', 'REMARKS': None}]
>>>
>>> # Insert 3 rows into the table
>>> insert = "insert into mytable values(?,?)"
>>> params=((1,'Sanders'),(2,'Pernal'),(3,'OBrien'))
>>> stmt_insert = ibm_db.prepare(ibm_db_conn, insert)
>>> ibm_db.execute_many(stmt_insert,params)
3
>>> # Fetch data using ibm_db_dbi
>>> select="select id, name from mytable"
>>> cur = conn.cursor()
>>> cur.execute(select)
True
>>> row=cur.fetchall()
>>> print("{} \t {} \t {}".format(row[0],row[1],row[2]),end="\n")
(1, 'Sanders')   (2, 'Pernal')   (3, 'OBrien')
>>> row=cur.fetchall()
>>> print(row)
[]
>>>
>>> # Fetch data using ibm_db
>>> stmt_select = ibm_db.exec_immediate(ibm_db_conn, select)
>>> cols = ibm_db.fetch_tuple( stmt_select )
>>> print("%s, %s" % (cols[0], cols[1]))
1, Sanders
>>> cols = ibm_db.fetch_tuple( stmt_select )
>>> print("%s, %s" % (cols[0], cols[1]))
2, Pernal
>>> cols = ibm_db.fetch_tuple( stmt_select )
>>> print("%s, %s" % (cols[0], cols[1]))
3, OBrien
>>> cols = ibm_db.fetch_tuple( stmt_select )
>>> print(cols)
False
>>>
>>> # Close connections
>>> cur.close()
True
>>> # Dropping the table created
>>> drop = "drop table mytable"
>>> stmt_delete = ibm_db.exec_immediate(ibm_db_conn,drop)
>>> conn1.tables('DB2INST1','MY%')
[]
>>>
>>> ibm_db.close(ibm_db_conn)
True

Example of SSL Connection String

Using SSLServerCertificate keyword
 
conn = ibm_db.connect("DATABASE=<DATABASE_NAME>;HOSTNAME=<HOSTNAME>;PORT=<SSL_PORT>;SECURITY=SSL;SSLServerCertificate=<FULL_PATH_TO_SERVER_CERTIFICATE>;UID=<USER_ID>;PWD=<PASSWORD>",'','')
Using SSLClientKeyStoreDB and SSLClientKeyStoreDBPassword keyword
 
conn = ibm_db.connect("DATABASE=<DATABASE_NAME>;HOSTNAME=<HOSTNAME>;PORT=<SSL_PORT>;SECURITY=SSL;SSLClientKeyStoreDB=<FULL_PATH_TO_CLIENT_KEY_STORE_DB>;SSLClientKeyStoreDBPassword=<KEYSTORE_PASSWORD>;UID=<USER_ID>;PWD=<PASSWORD>",'','')
Using SSLClientKeyStoreDB and SSLClientKeyStash keyword
 
conn = ibm_db.connect("DATABASE=<DATABASE_NAME>;HOSTNAME=<HOSTNAME>;PORT=<SSL_PORT>;SECURITY=SSL;SSLClientKeyStoreDB=<FULL_PATH_TO_CLIENT_KEY_STORE_DB>;SSLClientKeyStash=<FULL_PATH_TO_CLIENT_KEY_STASH>;UID=<USER_ID>;PWD=<PASSWORD>",'','')

More examples can be found under 'tests' folder.

API Documentation has examples for each API.

Jupyter Notebook examples can be found here -> Other Examples

API Documentation

For more information on the APIs supported by ibm_db, please refer to below link:

https://github.com/ibmdb/python-ibmdb/wiki/APIs

License requirements for connecting to databases

Python ibm_db driver can connect to DB2 on Linux Unix and Windows without any additional license/s, however, connecting to databases on DB2 for z/OS or DB2 for i(AS400) Servers require either client side or server side license/s. The client side license would need to be copied under license folder of your cidriver installation directory and for activating server side license, you would need to purchase DB2 Connect Unlimited for System z® and DB2 Connect Unlimited Edition for System i®.

To know more about license and purchasing cost, please contact IBM Customer Support.

To know more about server based licensing viz db2connectactivate, follow below links:

If you intend to install the clidriver manually, Following are the details of the client driver versions that you can download from CLIDRIVER to be able to connect to databases on non-LUW servers. You would need the client side license file as per Version for corresponding installation.:

CLIDriver and Client license versions for Specific Platform and Architecture

Platform Architecture Cli Driver Supported Version
AIX ppc aix32_odbc_cli.tar.gz Yes V11.5.5
others aix64_odbc_cli.tar.gz Yes V11.5.5
Darwin x64 macos64_odbc_cli.tar.gz Yes V11.5.5
Linux x64 linuxx64_odbc_cli.tar.gz Yes V11.5.5
s390x s390x64_odbc_cli.tar.gz Yes V11.5.5
s390 s390_odbc_cli.tar.gz Yes V11.1
ppc64 (LE) ppc64le_odbc_cli.tar.gz Yes V11.5.5
ppc64 ppc64_odbc_cli.tar.gz Yes V10.5
ppc32 ppc32_odbc_cli.tar.gz Yes V10.5
others linuxia32_odbc_cli.tar.gz Yes V11.5.5
Windows x64 ntx64_odbc_cli.zip Yes V11.5.5
x32 nt32_odbc_cli.zip Yes V11.5.5
Sun i86pc sunamd64_odbc_cli.tar.gz Yes V10.5
sunamd32_odbc_cli.tar.gz Yes V10.5
sparc sun64_odbc_cli.tar.gz Yes V11.1
sparc sun32_odbc_cli.tar.gz Yes V11.1

You can refer to ODBC and CLI Driver installation for details on how to install the driver manually.

Downloads

Use following pypi web location for downloading source code and binaries ibm_db: https://pypi.python.org/pypi/ibm_db . You can also get the source code by cloning the ibm_db github repository as :

git clone git@github.com:ibmdb/python-ibmdb.git

Latest Updates

Updated ibm_db

Apr 12, 2021: A new release 3.0.4 of ibm_db and ibm_db_dbi available.

Support & feedback

Your feedback is very much appreciated and expected through project ibm-db:

Contributing to the ibm_db python project

See CONTRIBUTING

The developer sign-off should include the reference to the DCO in remarks(example below):
DCO 1.1 Signed-off-by: Random J Developer <random@developer.org>

Some common issues

1. Installation Issues for missing python.h file

Always use the latest pip

python3 -m pip install --upgrade pip

Install the package python3-dev that delivers the python.h header file

For RHEL use
yum install python3-dev
For Ubuntu use
apt-get install python3-dev

Once the above steps goes through fine, try re-installing ibm_db.

Issues with MAC OS X

  • If you run into errors for libdb2.dylib as below:
>>> import ibm_db
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(/usr/local/lib/python3.5/site-packages/ibm_db.cpython-35m-darwin.so, 2): Library not loaded: libdb2.dylib
  Referenced from: /usr/local/lib/python3.5/site-packages/ibm_db.cpython-35m-darwin.so
  Reason: image not found

You would need to set DYLD_LIBRARY_PATH to point to lib folder as per the installation location of clidriver in your environment. Assuming the driver is installed at /usr/local/lib/python3.5/site-packages/clidriver, you can set the path as:

export DYLD_LIBRARY_PATH=/usr/local/lib/python3.5/site-packages/clidriver/lib:$DYLD_LIBRARY_PATH

If the issue is not resolved even after setting DYLD_LIBRARY_PATH, you could refer: MAC OS Hints and Tips

  • Resolving SQL1042C error

If you hit following error while attempting to connect to a database:

>>> import ibm_db
>>> ibm_db.connect("my_connection_string", "", "")
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 Exception: [IBM][CLI Driver] SQL1042C An unexpected system error occurred. SQLSTATE=58004 SQLCODE=-1042

Set DYLD_LIBRARY_PATH to point to icc folder as per the installation location of clidriver in your environment.

export DYLD_LIBRARY_PATH=/usr/local/lib/python3.5/site-packages/clidriver/lib/icc:$DYLD_LIBRARY_PATH

In case of similar issue in windows platform

set PATH=<clidriver_folder_path>\bin\amd64.VC12.CRT;%PATH%

Testing

Tests displaying Python ibm_db driver code examples are located in the ibm_db_tests directory. A valid config.py will need to be created to configure your DB2 settings. A config.py.sample exists that can be copied and modified for your environment.

The config.py should look like this:

test_dir =      'ibm_db_tests'         # Location of testsuite file (relative to current directory)

database =      'test'          # Database to connect to
user     =      'db2inst1'      # User ID to connect with
password =      'password'      # Password for given User ID
hostname =      'localhost'     # Hostname
port     =      50000           # Port Number

Point the database to mydatabase as created by the following command.

The tests that ibm_db driver uses depends on a UTF-8 database. This can be created by running:

  CREATE DATABASE mydatabase USING CODESET UTF-8 TERRITORY US

Some of the tests utilize XML functionality only available in version 9 or later of DB2. While DB2 v8.x is fully supported, two of the tests (test_195.py and test_52949.py) utilize XML functionality. These tests will fail on version 8.x of DB2.

Running the driver testsuite on Linux

In order to run the entire python driver testsuite on Linux, run this command at the command prompt:

  python tests.py

To run a single test, set the environment variable, SINGLE_PYTHON_TEST, to the test filename you would like to run, followed by the previous command.

Running the driver testsuite on Windows

In order to run the entire python driver testsuite on Windows, run this command at the command prompt:

  tests.py

To run a single test, set the environment variable, SINGLE_PYTHON_TEST, to the test filename you would like to run, followed by the previous command.

Known Limitations for the Python driver

If trusted context is not set up, there will be two failures related to trusted context. When thick client has been used then additional three failures related to create, recreate DB.

Known Limitations for the Python wrapper

  1. The rowcount for select statements can not be generated.
  2. Some warnings from the drivers are not caught by the wrapper. As such these might go unnoticed.

Project details


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