Connect docker python to SQL server with pyodbc

Question

I\'m trying to connect a pyodbc python script running in a docker container to login to a MSSQL database I have tried all sorts of docker files, but not been able to make th

Answer 1

Running through this recently I found it was necessary to additionally include the following line (note that it did not build without this step):

RUN apt-get install --reinstall build-essential -y

The full Dockerfile looks as follows:

# parent image
FROM python:3.7-slim

# install FreeTDS and dependencies
RUN apt-get update \
 && apt-get install unixodbc -y \
 && apt-get install unixodbc-dev -y \
 && apt-get install freetds-dev -y \
 && apt-get install freetds-bin -y \
 && apt-get install tdsodbc -y \
 && apt-get install --reinstall build-essential -y

# populate "ocbcinst.ini"
RUN echo "[FreeTDS]\n\
Description = FreeTDS unixODBC Driver\n\
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so\n\
Setup = /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so" >> /etc/odbcinst.ini

# install pyodbc (and, optionally, sqlalchemy)
RUN pip install --trusted-host pypi.python.org pyodbc==4.0.26 sqlalchemy==1.3.5

# run app.py upon container launch
CMD ["python", "app.py"]

Here's one way to then actually establish the connection inside app.py, via sqlalchemy (and assuming port 1433):

import sqlalchemy as sa
args = (username, password, server, database)
connstr = "mssql+pyodbc://{}:{}@{}/{}?driver=FreeTDS&port=1433&odbc_options='TDS_Version=8.0'"
engine = sa.create_engine(connstr.format(*args))