Hi Jon,
we are thinking about a refactoring of the OQL parser and SQL generation
for quite some time. At the moment we plan to work on that for next
feature release 1.1. The targets of the refactoring are not yet defined
finally but main points are:
- use ANTLR to generate OQL parser instead of hand written code
- make OQL parser and SQL generation plugable
- offer similar possibilities as with current OQL syntax
- fix some bugs if possible
How we go about extentensions of the syntax is not defined yet. The
problem here is that our current syntax is a custom one not compatible
to any standard. It has mainly been influenced by ODMG 3.0 OQL
definition but also not complies to that. As we like to develope Castor
to get complient with JPA(EJB3.0) in the future we may decide to not
further extend current OQL syntax but instead implement EJBQL complient
parser with extended functions.
Our targets in most cases do not depend on what we like to do but on the
demands of our users. How fast we progress with tasks does not only
depend on our targets but also on how much support/help we get from the
users ;-)
Having said that we expect syntax extensions to be much easier when
generating OQL parser by ANTLR as it is with our current codebase. In
addition it may be interesting for you to know that I frequently use
passthrough SQL queries as I also miss some syntax elements at OQL.
Regards
Ralf
Jon Wilmoth schrieb:
I have two questions:
1) Looking at http://www.castor.org/oql.html#Status, it says phase 3 is where the project is at. Is there a target for phase 4 or phase 5?
2) Is "unique collectionExpr" also part of OQL phase 4?
Thanks,
Jon
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