Connecting through the DirectConnect middleware product
SAP DirectConnect is a data access server that provides a
standardized middleware interface between your applications and your
enterprise data sources. Data access services to a particular database
are defined in a DirectConnect server. Since a DirectConnect server can
support multiple access services, you can access multiple databases
through a single server.
When you use the DirectConnect interface to connect to a
particular database, your connection is routed through the access
service for that database. An access service consists of a named set of
configuration properties and a specific access service library.
To access DB2 data on an IBM mainframe through a DirectConnect
server, you can use the DirectConnect interface to connect through
either a DirectConnect for MVS access service or a DirectConnect
Transaction Router Service (TRS).
TRS provides fast access to a DB2/MVS database by using remote
stored procedures. The DirectConnect interface supports both versions of
the TRS library: TRSLU62 and TRSTCP.
The DirectConnect server operates in two modes: SQL transformation
and passthrough. The DirectConnect interface for DB2/MVS uses
passthrough mode, which allows your PowerBuilder application to have
direct access to the capabilities of the DB2/MVS data source.