On Nov 1, 2009, at 8:22 AM, Shravan Kumar. M wrote:
clearly order "matters" to you, which means that ordering is "real
data" and should be represented in your db explicitly, not achieved
with trickery.
+1
PKs and FKs are artifacts of the DB, not data. One of the banes of my
current job is that there are lots of places in our apps where PKs and
FKs were exposed as class attributes and used to set and change
relationships. There's a few places where this is actually needed due
to server architecture, but in only about 1% of the places it was
used. So there's lots of places where the not only does the attribute
get set, but also the relationship, otherwise EOF would get confused.
Any time you want to use a PK or FK directly in a WO app, you should
ask yourself if you really, really, really need to do it. Maybe you
do, but you almost certainly don't.
Dave
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