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>]>