I am trying to finish off my Python interface with some extra helper
functions and I need to find the primary key in a table if it exists.
I have two questions.
Although I can't imagine doing so, will the system allow you to create
more than one primary key on a table? I just need to know whether I
ned to test for multiple keys.
Can someone suggest a SQL statement to pull out the primary key(s) from
a table?
Also, if multiple keys are allowed, what are people's opinions about
using them? Basically I am creating a get function that is defined as:
def db_get(db, cl, arg, keyname = None):
where db is the database handle, cl is the class, arg is either a value
to lookup or a dictionary containing the value and keyname is the
field to lookup which defaults to the primary key. The question is,
what do I do if keyname is omitted (defaults to primary) and there
are two primary keys. Should I just use the first one or should I
raise an exception. I favour the latter.
--
D'Arcy J.M. Cain <darcy@{druid|vex}.net> | Democracy is three wolves
http://www.druid.net/darcy/ | and a sheep voting on
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