HP Integrity NonStop J-Series - Manual (Page 105)

CREATING AND RUNNING A MULTIFILE APPLICATION
Associating and Linking Boxes
Sample Two-Level Tree Structure. Figure 5-9 shows an example of
a two-level tree structure. This figure also shows the SET TREE
command that builds this tree structure.
TREE(01 employee
02 dependents LINK empnum TO OPTIONAL emp-no)
S5044-028
employee
empnum
empname
• • •
Level 1
Dependents
dep-key
emp-no
dependent-no
• • •
Level 2
Link between Boxes
Figure 5-9. Sample Two-Level Tree Structure
Figure 5-10 shows the screen displayed by an application
generated with this tree structure. Note that a field from the
"employee" box (the box at the first level of the tree structure)
appears first on the screen. The "dependents" box directly
follows the join field ("empnum") of the "employee" box. The
join field ("emp-no") of the "dependents" box does not appear on
the screen.
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