October 8, 2010
QBQL is, to put it bluntly, “Relational Algebra done right”; and this posting is about the recent improvements.
include directive allows nesting QBQL programs inside each other. For example, the code snippet
[x] 1 2 <OR> [x] 2 3;
refers to user-defined operations introduced in the udf.def file (with generalized union operation
<OR> among them) and then executes the query.
3. Artificial distinction between database and program files is gone. To run the program you specify a single argument — the program name. For example,
C:\> java -jar C:\qbql_trunk\dist\qbql.jar C:\qbql_trunk\src\qbql\program\current.prg
runs the program
current.prg. It is up to the
current.prg to instantiate any database(s) with the include directive. (As we have seen in the previous bullet one might actually don’t need any explicit database initilalization).
Little more detailed instructions how to run QBQL are on updated Getting Started page.