Python connect to SQL Server - PYODBC - SQLAlchemy: Data source name not found and no default driver specified

Question

I am trying to establish a connection to SQL Server so I can upload my df to a table (using .to_sql() ) and run a query later on with this new table. My issue is that when trying to establish a connection to SQL Server (work database is on SQL Server ) I get the same error message when trying a couple of different methods.

    #Method 1
    TR_info = pd.read_excel(TR_path, sheet_name = 'TR information', skiprows = 3)

    cnxn_str = (r"Driver={SQL Server Native Client 11.0};"
                r"Server=server_name;"
                r"Database=ALDB;"
                r"Trusted_Connection=yes;") 
    
    cnxn = pyodbc.connect(cnxn_str)

    TR_info.to_sql(name='tr_info', schema='RF1', con = cnxn, index=False, if_exists='replace')

    #Method 2
    TR_info = pd.read_excel(TR_path, sheet_name = 'TR information', skiprows = 3)

    import sqlalchemy as sal

    engine = sal.create_engine('mssql+pyodbc://server_name/ALDB?driver=SQL Server Native Client 11.0?Trusted_Connection=yes')

    conn = engine.connect()

    TR_info.to_sql(name='tr_info', schema='RF1', con = conn, index=False, if_exists='replace')

Both methods give me the following error message.

(pyodbc.InterfaceError) ('IM002', '[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)') (Background on this error at: https://sqlalche.me/e/14/rvf5)

Finally, I have also confirmed I have SQL Native client 11.0 setup in my ODBC Data Source Administrator, so it is not that.

Answer 1

I am using a different driver, but maybe try the following syntax using quote_plus :

from urllib.parse import quote_plus

    SQL_SERVER_NAME = ''
    SQL_DB_NAME = ''
    SQL_USER = ''
    SQL_PW = ''

    odbc_connection_string = f"Driver={{ODBC Driver 17 for SQL Server}};Server=tcp:{SQL_SERVER_NAME}.database.windows.net,1433;Database={SQL_DB_NAME};Uid={SQL_USER}@{SQL_SERVER_NAME};Pwd={SQL_PW};Encrypt=yes;TrustServerCertificate=no;Connection Timeout=30;"

    SQLALCHEMY_DATABASE_URI = f"mssql+pyodbc:///?odbc_connect={quote_plus(odbc_connection_string)}"