Django查询SQL语句

时间：2022-10-21 12:32:08

Django查询SQL语句

Django查询SQL语句


# 1 res=models.Book.objects.all()

    # print(res)#<QuerySet [<Book: Book object>, <Book: Book object>, <Book: Book object>, <Book: Book object>, <Book: Book object>, <Book: Book object>]>

    #2  res=models.Book.objects.filter(price='555')

    # print(res)#<QuerySet [<Book: 海贼王>, <Book: 哆啦A梦>]>

    #3  res=models.Book.objects.get(nid=2)

    # print(res.price)#三月的狮子

    # res=models.Book.objects.get(nid=10)

    # print(res)#只能用于一个对象的里面

    #4  res=models.Book.objects.exclude(price='555')

    # print(res)#<QuerySet [<Book: 百变小樱>, <Book: 三月的狮子>, <Book: 水星领航员>, <Book: 火影忍者>]>

    #5 res=models.Book.objects.values('title','publishDate')

    # print(res)#<QuerySet [{'title': '百变小樱', 'publishDate': datetime.date(2000, 8, 8)}, {'title': '三月的狮子', 'publishDate': datetime.date(2017, 10, 19)}, {'title': '水星领航员', 'publishDate': datetime.date(2004, 2, 23)}, {'title': '火影忍者', 'publishDate': datetime.date(1996, 1, 2)}, {'title': '海贼王', 'publishDate': datetime.date(1995, 2, 2)}, {'title': '哆啦A梦', 'publishDate': datetime.date(1969, 12, 31)}]>

    #6 res=models.Book.objects.values_list('title','price')

    # print(res)#<QuerySet [('百变小樱', Decimal('155.00')), ('三月的狮子', Decimal('114.00')), ('水星领航员', Decimal('999.99')), ('火影忍者', Decimal('99.20')), ('海贼王', Decimal('555.00')), ('哆啦A梦', Decimal('555.00'))]>

    #7 res=models.Book.objects.filter(price='555').distinct()

    # print(res)

    #8 res=models.Book.objects.count()

    # print(res) 6

    #9 res=models.Book.objects.first()

    # print(res)#百变小樱

    #10 res=models.Book.objects.exists()

    # print(res)#True

####################################################

    #1 res=models.Book.objects.filter(price__gt=200 )

    # print(res)#<QuerySet [<Book: 水星领航员>, <Book: 海贼王>, <Book: 哆啦A梦>]>

    #

    #2 res=models.Book.objects.filter(price__lte=555,price__gte=114)

    # print(res)#<QuerySet [<Book: 百变小樱>, <Book: 三月的狮子>, <Book: 海贼王>, <Book: 哆啦A梦>]>

    #3 res=models.Book.objects.filter(publishDate__year=2017)

    # print(res)#<QuerySet [<Book: 三月的狮子>]>

    #4 res=models.Book.objects.filter(title__startswith='水')

    # print(res)#<QuerySet [<Book: 水星领航员>]>

    #5 res=models.Book.objects.filter(title__contains='小')

    # print(res)#<QuerySet [<Book: 百变小樱>]>

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