ODBC Driver for Microsoft Access

Connection String Parameters - ODBC Driver for Microsoft Access

Microsoft Access ODBC Connection String Parameters

The following table lists the connection string parameters for Microsoft Access.

Parameter Description


The full path to the database to connect to.

Advanced Settings

Allow NULL strings

To retrieve metadata, not all parameters according to MSDN can accept a null value. If NULL, the driver should return an error. But some 3rd-party tools pass NULL to the parameters. These options should be enabled for compatibility with such tools.

Empty strings as NULL

Character Set

Specifies the encoding for storing textual data in the database. Used for handling databases in older Access formats (e.g. Access 97) that lack Unicode support.

Exclusive Lock

If set to True, this parameter enforces a single-user access mode for the database. Even with ReadOnly set to True, only one user is able to access the database at a time. The default value is False.

Read Only

By default, Microsoft Access is a single-user database system. The connector implements a read-only multi-user mode to enable several users to read data from the database simultaneously. The possible values are True and False. The default value is False. By setting ReadOnly to True, two or more users are able to access the database simultaneously, however only in the ReadOnly mode.

ODBC Behavior

Used to set the behavior corresponding to the ODBC specification version that a third-party tool expects. The behavior of ODBC driver can be changed by setting a value for the SQL_ATTR_ODBC_VERSION attribute by calling the SQLSetEnvAttr function. But some third-party tools expect the driver to exhibit ODBC 2.x behavior, but forget to call SQLSetEnvAttr with the specified version or pass an incorrect value there. In this case, the required behavior can be explicitly specified in the Connection String by setting the ODBC Behavior parameter. The possible values are:
  • Default - Default ODBC behavior determined by a third-party tool.
  • Ver 2.x - ODBC 2.x behavior is explicitly set.
  • Ver 3.x - ODBC 3.x behavior is explicitly set.


Enables the use of local regional settings when converting numbers to strings.


Enables the use of local regional settings when converting dates and times to strings.

String Types

Sets the string value types returned by the driver as Default, Ansi or Unicode.

  • Default - the driver defines the string types.
  • Ansi - all string types will be returned as SQL_CHAR, SQL_VARCHAR and SQL_LONGVARCHAR.
  • Unicode - all string types will be returned as SQL_WCHAR, SQL_WVARCHAR and SQL_WLONGVARCHAR.

The parameter value should be changed if any third-party tool supports only Ansi string types or Unicode ones.

Microsoft Access ODBC Connection String sample

DRIVER=Devart ODBC Driver for Microsoft Access;Database=fullpathtoyourdatabase

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