django查询优化之是否存在
摘要:
res = Booking.objects.filter() # 方法一:exists() if res.exists(): print('queryset has data') else: print('queryset has no data') # 方法二:count() ==0 if res 阅读全文
posted @ 2023-03-27 21:47 一先生94 阅读(51) 评论(0) 推荐(0) 编辑