博客小项目

    #没有过滤条件 默认取全部
    rez = models.UserInfo.objects.filter()
    #取到userinfo里第一个对象
    ret = models.UserInfo.objects.filter().first()
    #filter是过滤条件得到符合条件的QuerSet对象列表，没写条件默认全取
    #values是取哪个字段的 values返回的是一个特殊的QuerSet对象以字典的形式
    rev = models.UserInfo.objects.filter().values()
    res = models.UserInfo.objects.filter().values().first()
    print(rez)#<QuerySet [<UserInfo: zhangxiangyu>, <UserInfo: shuaige>, <UserInfo: fengge>, <UserInfo: laji>]>
    print(ret)#zhangxiangyu
    print(rev)#<QuerySet [{‘password‘: ‘pbkdf2_sha256$36000$zp8ZbTg592rM$DnHyzSA7e01uPgT5w2BhxElnXeB+JCcDyxc8kIKqV1Q=‘,
    #  ‘last_login‘: datetime.datetime(2018, 7, 6, 14, 54, 45, 795147),
    #  ‘is_superuser‘: True,
    #  ‘username‘: ‘zhangxiangyu‘,
    #  ‘first_name‘: ‘‘,
    #  ‘last_name‘: ‘‘,
    #  ‘email‘: ‘‘,
    #  ‘is_staff‘: True,
    #  ‘is_active‘: True,
    #  ‘date_joined‘: datetime.datetime(2018, 7, 2, 12, 20),
    #  ‘nid‘: 1,
    #  ‘phone‘: ‘1323456789‘,
    #  ‘avatar‘: ‘avatars/lan.jpg‘,
    #  ‘blog_id‘: 1},
    #  {‘password‘: ‘pbkdf2_sha256$36000$1XDan2kCOZTM$YuGErlHmajPaP0Y6yekfE2DoAQNM0DT2iKGferJOK8o=‘,
    #  ‘last_login‘: datetime.datetime(2018, 7, 6, 20, 12, 52, 687070),
    #  ‘is_superuser‘: False,
    #  ‘username‘: ‘shuaige‘,
    #  ‘first_name‘: ‘‘,
    #  ‘last_name‘: ‘‘,
    #  ‘email‘: ‘‘,
    #  ‘is_staff‘: False,
    #  ‘is_active‘: True,
    #  ‘date_joined‘: datetime.datetime(2018, 7, 3, 11, 14, 58, 682584),
    #  ‘nid‘: 2,
    #  ‘phone‘: ‘13564860073‘,
    #  ‘avatar‘: ‘avatars/20170927154455_d935444a70089b866b462615580c1449_9.jpg‘,
    #  ‘blog_id‘: None},
    #  {‘password‘: ‘pbkdf2_sha256$36000$JxHqJPfwM5Br$86fF57EivL4jYSxUpoZq7Vms47f/O6qjL2WR/ljHvAo=‘,
    #  ‘last_login‘: None,
    #  ‘is_superuser‘: False,
    #  ‘username‘: ‘fengge‘,
    #  ‘first_name‘: ‘‘,
    #  ‘last_name‘: ‘‘,
    #  ‘email‘: ‘‘,
    #  ‘is_staff‘: False,
    #  ‘is_active‘: True,
    #  ‘date_joined‘: datetime.datetime(2018, 7, 3, 11, 23, 5, 372292),
    #  ‘nid‘: 4,
    #  ‘phone‘: ‘13564860074‘,
    #  ‘avatar‘: ‘avatars/64006a41a84a1a7271f938_f97B9Oz.png‘,
    #  ‘blog_id‘: None},
    #  {‘password‘: ‘pbkdf2_sha256$36000$45DjoTLDNOEb$fnlYjkGK3NGuj75YVHVYUAu22Xk1DUmlBOYTvS0R+v4=‘,
    # ‘last_login‘: datetime.datetime(2018, 7, 4, 8, 59, 18, 729869),
    #  ‘is_superuser‘: False,
    #  ‘username‘: ‘laji‘,
    #  ‘first_name‘: ‘‘,
    #  ‘last_name‘: ‘‘,
    #  ‘email‘: ‘‘,
    #  ‘is_staff‘: False,
    #  ‘is_active‘: True,
    #  ‘date_joined‘: datetime.datetime(2018, 7, 4, 8, 16, 41, 997415),
    #  ‘nid‘: 5,
    #  ‘phone‘: ‘13345678910‘,
    #  ‘avatar‘: ‘avatars/18309411_1200x1000_0.jpg‘,
    #  ‘blog_id‘: None}]>
    print(rev[0][‘password‘])#pbkdf2_sha256$36000$zp8ZbTg592rM$DnHyzSA7e01uPgT5w2BhxElnXeB+JCcDyxc8kIKqV1Q=
    print(res)#{‘password‘: ‘pbkdf2_sha256$36000$zp8ZbTg592rM$DnHyzSA7e01uPgT5w2BhxElnXeB+JCcDyxc8kIKqV1Q=‘,
    #  ‘last_login‘: datetime.datetime(2018, 7, 6, 14, 54, 45, 795147),
    #  ‘is_superuser‘: True,
    #  ‘username‘: ‘zhangxiangyu‘,
    #  ‘first_name‘: ‘‘,
    # ‘last_name‘: ‘‘,
    #  ‘email‘: ‘‘,
    #  ‘is_staff‘: True,
    # ‘is_active‘: True,
    #  ‘date_joined‘: datetime.datetime(2018, 7, 2, 12, 20),
    #  ‘nid‘: 1,
    # ‘phone‘: ‘1323456789‘,
    #  ‘avatar‘: ‘avatars/lan.jpg‘,
    #  ‘blog_id‘: 1}
    print(res[‘password‘])#pbkdf2_sha256$36000$zp8ZbTg592rM$DnHyzSA7e01uPgT5w2BhxElnXeB+JCcDyxc8kIKqV1Q=
　　

    #得到一个userinfo表对象
    res = models.UserInfo.objects.first()
    print(res)#zhangxiangyu(这相当于一个对象)
    #一对一关联的表可以将关联表名当做字段来查询但是它不等于某一个具体的值，而是等于一个对象
    obj = models.Blog.objects.filter(userinfo=res)
    print(obj[0].title)#zhangxiangyu的博客
    #一对一跨表查询 可以用__加关联表的字段来进行查询
    obj1 = models.Blog.objects.filter(userinfo__phone=‘13564860073‘).values(‘title‘)
    print(obj1)