On 9/17/14, 9:00 PM, Peter Eisentraut wrote:
On 9/14/14 2:49 PM, Jan Wieck wrote:
I don't think it is even a good idea to implement assertions that can
query arbitrary data.


In a normal programming language, an assertion is usually a static fault
in your program.  If the assertion ever fails, you fix your program and
then it hopefully never happens again.

Assertion that query the state of the database or result row counts are
pushing that concept quite a bit.  Those are not assertions, those are
just plain old error handling.

*shrug* I don't see them as error handling if they're just checking conditions which should never happen.

That said, in PL/PgSQL these expressions would likely have to be SQL expressions, and then you'd have to go out of your way to implement assertions which *can't* query arbitrary data. And that just seems silly.


.marko


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