事务相关问题

savepoint s1
insert1
savepoint s2
insert2 -- 发生问题也仅会rollback到s2
commit; --commit s1

savepoint s1
insert1 -- 发生问题会rollback到s1
savepoint s2
insert2
commit; --commit s2

都没问题的话：
savepoint s1
insert1
savepoint s2
insert2
commit; --commit s1