Andy Shellam wrote:
Am I missing something here? (It is late after a long day, I admit!)
Only something I forgot to mention.
All the foreign keys are set up as ON DELETE RESTRICT, meaning MySQL's
response to a foreign key violation is to spit out an error message to the
effect of "I'm sorry, Dave, I can't let you do that."
The problem is, the target platform doesn't use foreign keys for performance
reasons. I want to use foreign keys in development as a bug-trapping method --
I'd rather see an FK violation error in development than get an angry email
from a customer asking why there's a part listed that doesn't seem to have a
manufacturer.
The plan was to write a code-generator that would generate all the database
code for me, then I could deal with the page templates and display logic
myself (thus eliminating ~80% of the boring, repetitive work). I want the
generated code to handle foreign keys itself, rather than relying on the database.
As I said above, if foreign key constraints didn't slow things down markedly,
I'd use them in production. Based on the (admittedly limited) testing I've
done, application-side FK enforcement is considerably faster than using ON
DELETE CASCADE and letting MySQL deal with the foreign keys.
I don't like writing database code by hand (it all follows a standard
template), so I figured I'd write a program to do it for me. "Work smarter not
harder" and all that :)
Thanks,
--
Phil.
usene...@philpem.me.uk
http://www.philpem.me.uk/
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