[OT [OT]] - assering database query results

[Nicholas Clark]

Off topicly off topic, as it's not even about that 4 letter P word.

So, we have quite a lot of our database queries in config files, with
placeholders, etc

Some of them are only supposed to return 1 row.
However, if our assumptions are wrong, they might return multiple rows.
This isn't a fatal bug in our code, which is written such that it takes the
first row returned. However, it is a bug in our logic.

Is there a good way to "assert" that there is only one row? So that in the
development (and QA) environments, it is fatal to breach assumptions.
But production keeps going.

Nicholas Clark