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Home » Eclipse Projects » Dali » embedding JPQL in a typesafe manner
embedding JPQL in a typesafe manner [message #610584] Tue, 01 July 2008 14:12
Miguel Garcia is currently offline Miguel GarciaFriend
Messages: 77
Registered: July 2009
Member
Hi,

I'm exploring the pros and cons of embedded query languages (JPQL, LINQ) in
a typesafe manner (to detect misspellings at compile-time, check type
agreement between operands in WHERE clauses) and I was wondering whether
other Dali users are also working on that.

In a nutshell, such embeddings allow writing code similar to this [1]

List<Tuple3<String, Integer, Date>> rows =
new QueryBuilder(datasource)
.from(p)
.where(gt(p.height, 170))
.select(p.name, p.height, p.birthday)
.list();

but with an API generated automatically from an Ecore metamodel (
http://bugs.eclipse.org/234003 ) instead of one manually built as in the
example above.

It would be great to hear from others also working in this area.


Miguel
http://www.sts.tu-harburg.de/~mi.garcia/


References:

[1] Embedded Typesafe Domain Specific Languages for Java
Jevgeni Kabanov, Rein Raudj
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