17.13. Exposing Persistent Stored Modules as
Virtuoso SQL stored procedures and functions can be exposed as
SOAP services very simply from Virtuoso, whether they are native
Virtuoso or on remote data sources. This powerful ability means
that any database servers already existing within an organization
can easily become a component in an eBusiness solution using
Virtuoso. All you need is a few simple steps that typically take
mere minutes to complete:
Choose your stored procedure(s) . The
procedures that you want to expose can either be native Virtuoso
stored procedures, or remote stored procedures that can be linked
in using the Remote Procedures user interface.
Choose a virtual directory . Because SOAP
services need to be exposed and accessed via HTTP a Virtuoso
virtual directory must be used. Either use the existing SOAP
virtual directory or create a new one.
Publish procedures to virtual directory .
The user specified as SOAP account on the virtual directory must
have execute privileges on the procedures. Use the Publish options
on the virtual directory user interface.
Test the VSMX output . Once procedures
have been published as SOAP services they are automatically
described by WSDL and testable using Virtuoso's VSMX feature.
XML Query Templates provide a direct way to store SQL in an XML
file on the Virtuoso server that when executed, i.e. fetched from a
web browser, actually returns the results of the query.
The C Interface chapter describes how users can define custom
built-in functions, from C or other programming languages, that can
be used from within Virtuoso PL. This also means that VSE's can
also be published as a Web Service!