DB.php patch - error handling, flexible WHERE clauses, fix bug

[faguss]

There is a syntax error. Should be

Code:

_calcWhere

instead of

Code:

calcWhere

. That's line 144 in the original paste and 169 in my snippet (already fixed).

Figured out a way to find multiple records with more than one condition on each one: https://pastebin.com/XmJR0Jk5