Creating new expression builders to process Subscription service requests
In this step, you create
expression builders that allow the storefront to access the Day-of-month
schedule information. The get-data-config.xml file
contains expression builders, each represents a different SQL query
that is defined in the query template file. By referencing the appropriate
expression builder, getData tags in the storefront JavaServer Pages
(JSP) files can retrieve specific data from the database.