You can use a data source name (DSN) to create an ODBC connection between your web application and your database. A DSN is a name containing all the parameters needed to connect to a specific database using an ODBC driver.
Because you can only specify an ODBC driver in a DSN, you must use a connection string if you want to use an OLE DB provider.
You can use a locally defined DSN to create a database connection in Dreamweaver.