In this editor, you enter all the characteristics of a
Block.
Database Block Overview tab
The Overview tab of a Database Block
displays the label of the Database Block instance
in a read/write mode. It also displays information specific to the
instance in a read-only mode. Buttons in the Overview tab
enable you to access the other tabs of the editor in which you can
modify or complete this information.
Database Block Definition tab
In this tab, you specify the logical information that is
necessary to generate the Block in a source language, the Data Description
Language (DDL).
-DR Lines in a Database Block
In the -DR Lines tab, you specify
which SQL objects make up the relational database. A -DR
line definition section displays the following information:
the type and external name of the object, the referenced table (for
J type lines only), the code of the Segment that represents the Block,
the key type that is supported by the Segment, and the generation
transaction type.
-DC Lines in a Database Block
The -DC Lines tab is dedicated to
the description of the CODASYL, DMSII, and TANDEM Database Blocks.
You can declare the areas, call the records, and distribute them within
the AREAS, call the SETS and describe them (name, label, parent, and
child Segments).
-DH Lines in a Database Block
In the -DH Lines tab, you can describe
the relationships between Segments in a hierarchical database (example:
DL/1).
-G Lines tab
This tab contains subtabs which enable you to enter comments
or specify generation elements or options on the Block.
-CR Lines tab
This tab is shared by all entity types. It contains the
links between entities. These links are called "references".
In this tab, you can add references that are not already defined in
the design of the entities.
Keywords tab
In this tab you enter new keywords or view the keywords
already assigned to the instance.