Using subsets of entity sets
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6 - Using subsets of entity sets

The basic routines of the TAP introduced in Chapter 5 are essential but not sufficient to build real applications. For that purpose one needs higher level concepts and new data operators. This chapter is devoted to the fundamental idea of subsets of entity sets. Subsets permit operations on parts of an ESet, thus facilitating the performance of data queries.

6.1 - Subsets and selectors

6.2 - An example program

6.3 - Basic management of selectors

6.4 - Looping over subsets of entities

6.5 - Selecting subsets of entities

6.6 - An example of selection

6.7 - Navigating along relationships

6.8 - A navigation example

6.9 - Another navigation example

6.10 - Summary

BR and MR - CERN PTG - ADAMO Users Guide for Version 3.3 - 11 Oct 93