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djang常用查询SQL语句的使用代码

2019年05月29日  | 移动技术网IT编程  | 我要评论

523au,淡水天气预报,badboy特攻粤语

将django语法和sql对应一下，希望对大家有所帮助

查询单个列的值

story.object.values_list("url", flat=true)
select `story`.`url` from `hbtc_story` where `story`.`status` = resolved

and查询

stories.objects.filter(q(status='resolved') & q(status='developing'))
select * from `story` where (`story`.`status` = resolved and `story`.`status` = developing)

或查询

stories.objects.filter(q(status='resolved') | q(status='developing'))
select * from `story` where (`story`.`status` = resolved or `story`.`status` = developing)

not查询

stories.objects.filter(~q(status='resolved'))
select * from `story` where not (`story`.`status` = resolved)

查询为空

stories.objects.filter(status__isnull=true)
select * from `story` where `story`.`plan_id_id` is null

like查询

stories.objects.filter(status__contains='resolved')
select * from `story` where `story`.`status` like binary %resolved%;
stories.objects.filter(status__endswith='resolved')

select * from `story` where `story`.`status` like binary %resolved;
stories.objects.filter(status__istartswith='resolved')

select * from `story` where `story`.`status` like binary resolved%;

in查询

stories.objects.filter(status__in=('resolved',))
select * from `story` where `story`.`status` in (resolved) ;

distinct查询

story.object.values_list("status", flat=true).distinct()
select distinct `story`.`status` from `story`

具体示例代码

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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