def dbMath(self, typ, field, op, value):
ops = orb.Query.Math(op)<EOL>format = self.MathMap.get(typ, {}).get(ops) or self.MathMap.get('<STR_LIT>').get(ops) or '<STR_LIT>'<EOL>return format.format(field=field, value=value)<EOL>
Performs some database math on the given field.  This will be database specific
implementations and should return the resulting database operation.

:param field: <str>
:param op: <orb.Query.Math>
:param target: <variant>
:param context: <orb.Context> || None

:return: <str>