OpenEdge Data Management: DataServer for Microsoft SQL Server

Chapter 3: RDBMS Stored Procedure Details
Data output and retrieval options
This section briefly highlights the data retrieval options that you can initiate through the
execution of a stored procedure. See the “Interfacing with RDBMS stored procedures”
section on page 134 for more information and examples of each option.
Return codes
This value might be a success code or a value returned by the stored procedure (as
defined by the data source).
Values of output parameters defined when creating a
procedure
When you call a stored procedure, you can specify the ordered list of positional
parameters, or you can name them individually. To retrieve output parameter values
from a stored procedure, request them with the keyword OUTPUT or INPUT-OUTPUT
when you execute the procedure; your selected INPUT and OUTPUT parameter options
must match the corresponding signature of the stored procedure at the data source.
Results retrieved from a database
This section identifies and briefly defines three coding techniques that ABL supports to
retrieve data source results. In general, you can think of these techniques as handling
complex query results for which each technique has its own purpose and benefits.
Using the OpenEdge-supplied proc-text-buffer for row results
This technique:
• Allows you to access result sets available through a pseudo table for which each
row is a long character string
• Requires you to parse each long string to access specific fields
The Proc-text-buffer is part of the schema holder, making this result set option
independent of the foreign data source.
Defining a special view on the MS SQL Server data source to use as a buffer for
row results
This technique allows you to:
• Define views within the foreign data source
• Use the result set buffer configuration of the view to access the data returned by
the stored procedure
Defining of a special view involves some administration on the foreign datasource and
therefore is considered a result set option that is dependent on the foreign data source.
132 OpenEdge Data Management: DataServer for Microsoft SQL Server