![]() In Access, you use ODBC data sources to connect to data sources external to Access that do not have built-in drivers. In the ODBC architecture, an application such as Access connects to the ODBC Driver Manager, which in turn uses a specific ODBC driver (for example, Microsoft SQL ODBC driver) to connect to a data source. This information can be obtained from the administrator of the database to which you want to connect. Examples of connection information include server location, database name, logon ID, password, and various ODBC driver options that describe how to connect to the data source. Examples of data sources are SQL Server, Oracle RDBMS, a spreadsheet, and a text file. In this articleĪ data source is a source of data combined with the connection information that is required to access that data. The procedure steps might vary depending on the specific database products and ODBC drivers used. This article contains general information about ODBC data sources, how to create them, and how to connect to them by using Microsoft Access. Open Database Connectivity (ODBC) is a protocol that you can use to connect a Microsoft Access database to an external data source such as Microsoft SQL Server. This is fine - but you then need to be very careful to keep the 32-bit and 64-bit DSN configurations in sync, as different output resulting from different configurations can lead to undesired and unexpected results in the end, especially in scenarios where tools invisibly mix 32-bit and 64-bit components (as some versions of Microsoft SQL Server and Visual Studio are known to do).Access for Microsoft 365 Access 2021 Access 2019 Access 2016 Access 2013 Access 2010 Access 2007 More. It can be tempting - and in some ways useful - to use identical names for 32-bit and 64-bit DSNs. System DSNs will only be seen by the applications and tools which can use them - 32-bit DSNs for 32-bit applications, and 64-bit DSNs for 64-bit applications.įor this reason among others, we strongly advise using only System DSNs in 64-bit environments. Likewise, the 64-bit Administrator, and all 64-bit ODBC applications (typically installed to %systemdrive%/Program Files/), will list 32-bit User DSNs (that is, DSNs based on 32-bit ODBC drivers) - even though these DSNs and drivers cannot be used by the 64-bit tools/applications. Note that the 32-bit Administrator, and all 32-bit ODBC applications (typically installed to %systemdrive%/Program Files (x86)/), will list 64-bit User DSNs (that is, DSNs based on 64-bit ODBC drivers) - even though these DSNs and drivers cannot be used by the 32-bit tools/applications. Start -> Control Panels -> Data Sources (ODBC) (The 64-bit ODBC Administrator can also be accessed through the Control Panels interface, as the Data Sources (ODBC) control panel.) Typical Paths to ODBC Administrators ![]() This controls 64-bit ODBC drivers, which are required by 64-bit client applications. (The 32-bit ODBC Administrator cannot be accessed through the Control Panels interface the Data Sources (ODBC) control panel is the 64-bit ODBC Administrator.)Ĭounterintuitively, the 64-bit ODBC Administrator is found at %systemdrive%/Windows/System32/odbcad32.exe. This controls 32-bit ODBC drivers, which are required by 32-bit client applications. The 32-bit ODBC Administrator is found at %systemdrive%/Windows/ SysWoW64/odbcad32.exe. They are differentiated by their filesystem location. Many 64-bit environments still support 32-bit applications, and these require 32-bit ODBC drivers and DSNs, so it's important to understand how this all works.īoth the 32-bit and 64-bit ODBC Administrator are named odbcad32.exe. Using ODBC (32-bit and 64-bit) on 64-bit WindowsĦ4-bit Windows has some surprising and counterintuitive setup and behavior around 32-bit and 64-bit ODBC.
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