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title Default Data Source
description Default Data Source
author David-Engel
ms.author davidengel
ms.date 01/19/2017
ms.service sql
ms.subservice connectivity
ms.topic concept-article
helpviewer_keywords
data sources [ODBC], connection functions
connecting to data source [ODBC], default data source
functions [ODBC], data source or driver connections
data sources [ODBC], default
default data source [ODBC]
connecting to data source [ODBC], functions
connecting to driver [ODBC], default data source
connecting to driver [ODBC], functions
connection functions [ODBC]
ODBC drivers [ODBC], connection functions
ms.custom sfi-ropc-nochange

Default Data Source

The driver may select a data source, called the default data source, in certain cases where the application does not explicitly specify one:

  • In a call to SQLConnect where the ServerName argument is a zero-length string, a null pointer, or DEFAULT.

  • In a call to SQLDriverConnect where InConnectionString either specifies DSN=DEFAULT or specifies with the DSN keyword a data source that is not contained in the system information.

It is driver-defined how the default data source is specified. This may involve administrative action and may depend on the user.