使用python连接到DB2

Question

I'm using python 2.7 and I want to connect to a DB2 database and insert data into it. Here is what I did so far :

import sqlalchemy
from sqlalchemy import *
import ibm_db_sa

db2 = sqlalchemy.create_engine('ibm_db_sa://user:pswd@localhost:50001/prm')
metadata = MetaData()
users = Table('users', metadata, 
Column('user_id', Integer, primary_key = True),
Column('user_name', String(16), nullable = False),
Column('email_address', String(60), key='email'),
Column('password', String(20), nullable = False)
)
metadata.bind = db2
metadata.create_all()
users_table = Table('users', metadata, autoload=True, autoload_with=db2)
users_table

The problem is when I execute the code above I get this the following error :

ProgrammingError: (ProgrammingError) ibm_db_dbi::ProgrammingError: [IBM][CLI Driver]
SQL1042C  An unexpected system error occurred.  SQLSTATE=58004\r SQLCODE=-1042 None None

Can anyone help me to figure this out ?

Answer 1

Although problem solved I write my bit as it might be helpful for someone.

In my case LD_LIBRARY_PATH and all lib folders were OK.

Reinstalling ibm_db and ibm_db_sa in virtualenv solved issue.

pip uninstall ibm_db ibm_db_sa
pip install ibm_db ibm_db_sa

My guess is that ibm_db was installed before there was a DB2 driver installed in system (maybe someone ignored errors/warning).

It's good to check if you can connect to database with db2cli first

db2cli execsql -connstring "DATABASE=database_name;HOSTNAME=db_host;PORT=50000;PROTOCOL=TCPIP;UID=db_user;PWD=db_pass;"

> select 'db_name' from sysibm.sysdummy1

Answer 2

I finally got it to work by adding LD_LIBRARY_PATH to environment variables with the value : <YOUR_DB2_HOME>\\SQLLIB\\lib . It works perfectly now.