See the IBM® i Information Center programming category (URL http://www.ibm.com/systems/i/infocenter/) for a description of the IBM i control language (CL) and its commands.
See the IBM i
Information Center database
and file systems category for related database programming topics such as,
using files in application programs, database organization, data description
specifications (DDS) and DDS keywords, distributed data management (DDM),
embedded SQL programming,
and application programming interfaces.
http://www.ibm.com/systems/i/infocenter/