The sqlsource statement allows defining connections to external datasources such as databases. Connections are referred to by an identifier, and may be used by any other statement of the SQL Extension.
For the Perl implementation, Actual connections are open using the DBI generic database library. The connection scheme uses the following syntax:
The SQL::LAST_DEFINED_SOURCE variable contains datasource identifier of the connection opened by the latest <%sqlsource statement call. It may serve as default datasource for any SQL statement with no source defined.