The tab dedicated to the description lines is specific
to the type of Database Block that is defined in the Database Block
editor. The -DH Lines tab is specific to the
hierarchical Database Blocks. The -DR Lines tab
is specific to the relational Database Blocks. The -DC
Lines tab is specific to the CODASYL, DMSII and TANDEM Database
Blocks.
About this task
What are the description lines used for?
- The -DH lines are used to describe the relationships between Segments
in a hierarchical database (example: DL/1).
- In the -DR lines, you specify which SQL objects make up the relational
database (table spaces, tables, table views, index, or key).
- The -DC lines are used to logically describe a CODASYL schema
or subschema: declare areas, call records and distribute them among
areas, define, and describe sets (code, name, owner record, member
record).
The procedure to create description lines is the same for all Database
Block types. In the tab dedicated to the description lines of a Block,
you can specify the description lines of the current Block in a tree
structure list. You can also delete some of them or reorganize them
in the list. The other part of the window displays a definition section
that opens when you select a description line in the list. In this section,
you can give further information about the selected description line.
Moreover, you can access
-GG Lines wizard by
clicking the
-G Lines button and specify generation elements associated
with the selected description line.