15.3. Jaql
To provide a running example of query language programming, this chapter introduces Jaql, a general-purpose query language similar to SQL. The name Jaql is an acronym for “just another query language.”
This section shows examples of Jaql queries and their results against the chip company's data. If you like, you can run the sample program and try your own queries. Using the files on the CD, run the Jaql environment:
> java sjm.examples.query.JaqlUe
The JaqlUe class starts up a UE (user environment), as Figure 15.7 shows.
Figure 15.7. An environment for Jaql queries. This user environment accepts queries, applies them against a potato chip database, and shows the results.
Although Jaql is a general-purpose language, this UE always ...
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