分佈式系統中多副本雪花算法防止主鍵衝突

db = get_db_return()
models_item = models.Item(
)
db.add(models_item)
for i in range(10):
    try:
        db.commit()
        break
    except Exception as e:
        db.rollback()
        models_item.id = SonyFlake().next_id()

详细介绍冲突的产生：
https://www.cnblogs.com/CnFallTime/p/16591007.html