The SAP B1 adaptor is a database 'read' and uses files to write the order
For the reads the system supports both the Oracle and SQL databases.
For the writes the system produces a file (normally xml) that is then imported using the SAP B1iF (Integration Framework). he B1iF task is done by the SAP consultant so please check with them to ensure they are aware of this
An example of B1iF is here https://www.youtube.com/watch?v=laS5gueVtOY