improve multiple results support The specification talks exactly about -1: > Returns: the current result as an update count; > -1 if the current result is a ResultSet object or there are no more results Other negative numbers can theoretically mean something different than „no more results“ e.g. unknown number of updates (?).

eb3676c6929b133cabb94181ed87729978275800 v0.8
3c6d560a1d146011b2a95f542470aeb263ba588a v0.9
0503996934e0cb507c841799b7b87f099867898a v0.10