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Ineresting post from D group about Doost lib.. [message #15744]

Tue, 06 May 2008 21:57

unodgs
Messages: 1366
Registered: November 2005
Location: Poland

Ultimate Contributor

..seem our Sql module is not so bad Wink

Quote:

Now I am working on D version of part of U++ library, which is intended to
allow type safe database queries.
(http://www.ultimatepp.org/src$Sql$SqlExp$en-us.html)

Imagine that you put database schema into file:
http://www.dsource.org/projects/doost/browser/trunk/examples /database/TestSchema.schema

and then you use in your program typesafe versions of sql:
http://www.dsource.org/projects/doost/browser/trunk/examples /database/PackageTest.d

And simple cases work already quite well Smile

I just see problem with sql expressions. In U++ it is done like below:
Select(BOOK.AUTHOR).WHERE((BOOK.ID == 100) && (BOOK.TITLE == "Dot"));

In D it is not possible (unfortunately) and must be written like below:
Select(BOOK.AUTHOR).WHERE(land(leq(BOOK.ID, 100), leq(BOOK.TITLE, "Dot")));

I hope that maybe Walter someday will reconsider adding extended operators
overloading as addition to the current system.

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