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LINQ to NHibernate - First pass HQL parser
Posted on Monday, March 09, 2009 3:13 PM

A brief update on the LINQ to NHibernate work that I'm doing at the mo (previous post here if you need a refresh).

Over the last few days, I've been working on test cases for the HQL string -> HQL AST part of the parser. I had a great start from Fabio, who had already compiled a vast number of queries that show pretty much the whole HQL language, so it was just a case of getting my fledgling parser to actually process them all.

The good news is that it has been a relatively painless process, and we now have 816 tests, with each test pushing a query through the parser and checking that the resultant AST matches the tree that the Hibernate implementation creates. I'm pretty happy with that - although I don't doubt that there are still a couple of gremlins to catch, it does give me a good deal of confidence that this part of the project is in pretty good shape.

Onto the HQL AST -> SQL AST processing - stay tuned!

26 Comments

Comments

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Left by Pingback/TrackBack on 3/10/2009 8:03 AM
# Specification Pattern and LINQ to NHibernate &amp;laquo; Andy Hitchman&amp;#8217;s Blog
Gravatar Specification Pattern and LINQ to NHibernate &laquo; Andy Hitchman&#8217;s Blog
Left by Pingback/TrackBack on 3/13/2009 11:56 AM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar What happens when you reach the milestone of 100% tests passing?
Left by Matt on 3/25/2009 4:47 AM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar Once I'm at 100% (or real close), then I move onto the LINQ provider, which is the real goal for this work...
Left by sstrong on 3/30/2009 3:50 PM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar How goes the work?
Left by Matt on 4/1/2009 6:58 AM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar Progress nicely through the second stage & third stages (HQL AST -> SQL AST & SQL AST -> SQL). Right now, I'm testing the new parser against the main NHibernate test suite - of the 1500 or so tests, there are currently only 17 failing. So pretty close to having the parser side of the project completed.
Left by sstrong on 4/1/2009 9:58 AM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar Are these changes targeted for post NH2.1?
Left by Matt on 4/6/2009 5:05 PM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar This sounds great, can I download the source and send you some patches to speed up the progress?
Left by Paco on 4/9/2009 1:58 PM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar Kudos to your work Steve and probably more to imeta company to "sponsor" it. Is is really appreciated.

Take your time, as allways, quality work is more welcomed then a rush-release with half-baked LINQ provider. More to it that we all love robustness and maturity of this excellent O/RM tool.

as a company leveraging nHibernate, what is a timeframe we should start teaching our staff to use LINQ instead of object SQL and become more familiar with the LINQ world?

I know it is hard to tell exactly (as a project manager I _should_ know, *grin*) but any timeframe +/- in month would be useful for us.

You only know what tools you will choose and (if) you leverage any LINQ stuff already baked on the market (there are many useful gadgets that helps making a provider).

So question is, are we looking on May-June release or we will still be in Alpha in September-October?

Again no rush, I need just some estimates if I'm _already_ late or I was right with pre-Christmas planning.

Thanks very much
Left by Steve Raynolds on 4/10/2009 5:41 PM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar Hey Steve,

Timescales are a little hard to predict, but I would hope we'd be looking for an initial release around June. Currently, progress on the HQL parser has been good (another blog on that will be out in the next couple of days), so the LINQ work is imminent.
Left by sstrong on 4/11/2009 9:23 PM
# re: LINQ to NHibernate - First pass HQL parser
Gravatar June sounds really nice!

What is with the Criteria "parser"? Or you just don't need it and it will use HQL?
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