How to Fix 'Data source name not found and no default driver specified' Error in PYODBC?-Mysql Tutorial-php.cn

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How to Fix 'Data source name not found and no default driver specified' Error in PYODBC?

Patricia Arquette

Jan 24, 2025 am 07:37 AM

How to Fix

Solving the "Data source name not found" PYODBC Connection Error

Connecting to SQL Server databases with PYODBC can sometimes throw a frustrating "Data source name not found and no default driver specified" error. This usually points to an incorrectly configured connection string, specifically a missing or incorrect ODBC driver specification.

Consider this example connection string:

import pyodbc
connection = pyodbc.connect('Driver = {SQL Server};Server=SIWSQL43A\SIMSSPROD43A;'
                            'Database=CSM_reporting;Trusted_Connection=yes;')

The problem lies in the vague 'Driver = {SQL Server}' entry. It doesn't specify which SQL Server ODBC driver to use. To fix this, you must explicitly state the driver version.

A successful solution often involves using the ODBC Driver 17 for SQL Server:

'DRIVER={ODBC Driver 17 for SQL Server}'

To determine the correct driver version for your system:

Search your system's applications or programs list for "ODBC".
The installed ODBC drivers will be listed. Note the version number (e.g., "ODBC Driver 17 for SQL Server").

Replace {SQL Server} in your connection string with the precise driver name you found, ensuring the correct version is specified. This precise specification eliminates ambiguity and resolves the "Data source name not found" error.

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