Casper Bang wrote:
> The issue goes a little deeper than your simple use case though. The
> Java enterprise world, due to the lack of expression trees, has to
> work with many thousands lines of embedded DSL (JPQL/HQL/SQL etc.).
> This poses several problems:
>
> - How do you format/indent it?
> - How do you copy-paste between database tool and IDE?
> - How do you get help with the syntax?
>
> By my experience, that is very much a real problem :
>
> " select new com.somecompany.somexp.backend.model.ManagerInfoRecord("+
> " c, b.itemNo, x )" +
> " from SomeEntity x" +
> " Join x.account a" +
> " Join a.baseData b" +
> " Join b.customer c "+
> " where x.state <> com.somecompany.somexp.backend.entities.SomeEntity
> $ReadingState.InValid " +
> " and ( " +
> " (" +
> " x.someState = com.somecompany.somexp.backend.entities.SomeEntity
> $someState.Valid " +
> " and b.someData <> 'Y' " +
> " )" +
> " or x.someOtherState =
> com.somecompany.somexp.backend.entities.SomeEntity
> $someOtherState.Valid " +
> " )" +
> " and b.relatedEntity =:relatedEntity " +
> " and x.someForeignRelation <>
> com.somecompany.somexp.backend.entities.SomeEntity$EntityStateEnum.E
> " ),
>
> And that's just one small annotation query (obfuscated to protect the
> innocent). Fun eh? :)
>
You don't embed this sort of thing. You use getResourceAsStream() and a
separate file along with MessageFormat or such to perform substitutions
of live data if need be.
Plain and simple.
This also allows the IDE to do easily appropriate things for a .sql file
or the like.
[In the XML sphere I'm all for sticking SVG, XSL FO, etc, directly
inside an XHTML document -- but this whole approach seems to be dying on
the vine there, even though the grammar is the same throughout all of
these.]
--
Jess Holle
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