How to Resolve: [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)

This article, provides useful troubleshooting tips, for the following error which you might get, under certain circumstances, when trying to connect to SQL Server from Python, using pyodbc: [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect).

Prior to sharing our tips for troubleshooting the issue, let’s discuss about the two main ways of connecting to SQL Server from Python.

 

Ways of Connecting to SQL Server from Python

In Python, there are 2 main ways for connecting to SQL Server, using the pyodbc module and Microsoft ODBC Driver 17 for SQL Server.

 

Specifying the Full Connection String in Python

The first way, is to define the full connection string in you Python code.

For example, in case you are using a username/password instead of a trusted connection, here’s a relevant example:

conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER=server_name;DATABASE=database_name;UID=user;PWD=password')

 

In case you are using a trusted connection, here’s another relevant example:

conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER=server_name;DATABASE=database_name;Trusted_Connection=yes;')

 

Referencing an ODBC System DSN

The second way, is to reference an ODBC DSN.

Here’s a code example, that references and ODBC DSN:

conn = pyodbc.connect('DSN=mynewdsn;UID=user;PWD=password')

 

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Troubleshooting the Issue

The error message we are examining in this post, indicates that we are trying to connect to SQL Server, using the second method, that is referencing an ODBC DSN and the process fails.

In this case, we can further troubleshoot the issue, by performing the below checks.

 

Check 1 – Verify that the DSN Name is Valid

Check in ODBC Data Source Administrator that the DSN exists with the exact same name you are referencing it in your Python code.

Additionally, you must check that the DSN indeed works.

For checking the DSN:

• 64-bit ODBC Data Source Administrator if you are using a 64-bit version of Windows:
  C:\WINDOWS\System32\odbcad32.exe

 

• 32-bit ODBC Data Source Administrator if you are using a 32-bit version of Windows:
  C:\WINDOWS\SysWOW64\odbcad32.exe

 

Check 2 – Verify that the DSN is Correctly Referenced in Python Code

If the DSN uses a username/password, you need to also specify it in your Python code as per below example:

conn = pyodbc.connect('DSN=dsn_name;UID=user;PWD=password')

If the DSN uses a trusted connection, you need to also specify it in your Python code as per below example:

conn = pyodbc.connect('DSN= dsn_name;Trusted_Connection=yes;')

 

If None of the Above Helps

If none of the above helps, then you may consider instead of using a DSN, to define the full connection in your Python code (see first way above).

 

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