2010/10/15 Mark Engelberg <[email protected]> > On Fri, Oct 15, 2010 at 1:49 AM, David Powell <[email protected]> > wrote: > > I'm in favour of down-casing - at least by default. Some processing is > going to happen anyway, as column names might contain spaces, which wouldn't > > be allowed in keywords. > > > > -- > > Dave > > One of the more significant nuisances in Clojure/Java interop is that > if you use some sort of wrapper library which converts Clojure things > to Java, and then converts from Java back to Clojure, you often end up > with something different than you started. Anywhere we can ameliorate > this, we should. > > For example, if I create a table using clojure.contrib.sql, where the > column names are things like :numberOfApples, and then I load in a > bunch of maps of the form {:numberOfApples 2}, {:numberOfApples 5}, > and so on, then when I fetch them out of the database, I really need > them to be {:numberOfApples 2}, etc. so that I can compare them with > the original maps used to fill the database to begin with. > > Right now, I get back {:numberofapples 2}. Yes, SQL is usually case > insensitive, but Clojure is not, so everything breaks down if you > don't get back the maps in the form you started with. Since SQL > typically *stores* the column names internally in mixed case (even > though it ignores the case for querying purposes), you might as well > retrieve them in mixed case so it matches the form you started with. > > Why would I write my column names using mixed case? Because I once > tried using :number-of-apples to match Clojure's conventions, but got > burned by a number of third-party tools gagging on the hyphens. > > I guess most of the time column names are written with names_separated_by_underscores, but anyway, it seems indeed weird that such downcase is done, especially without any (or to come) good reason for that.
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