9 ORM-高阶补充(未完成)
https://www.cnblogs.com/alice-bj/p/9195846.html#_labelTop
https://www.cnblogs.com/yuanchenqi/articles/7570003.html
Queryset: 1 切片操作 Book.objects.all()[0:8] 2 迭代操作 for obj in Book.objects.all(): print(obj.属性) 3 惰性查询 ret=Book.objects.all() # for i in ret: # print(i) # # Book.objects.create(title="java",publishDate="2012-12-12",price=12,publish_id=1) # # for i in ret: # print(i) 4 缓存机制 # ret=Book.objects.all().exists() # if ret: # print("OK") # ret=Book.objects.all().iterator() # print(type(ret)) # for i in ret: # print(i) # Book.objects.create(title="hello2",publishDate="2012-12-12",price=12,publish_id=1) # # for i in ret: # print(i)
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】博客园社区专享云产品让利特惠,阿里云新客6.5折上折
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步