djang常用查询SQL语句的使用代码

djang常用查询SQL语句的使用代码

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)#, , , , , ]>

  #2 res=models.Book.objects.filter(price='555')
  # print(res)#, ]>

  #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)#, , , ]>

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

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

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

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

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

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。