djang常用查询SQL语句的使用代码

数据库  /  管理员 发布于 5年前   225

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 [,,,,,]>  
#2 res=models.Book.objects.filter(price='555')  
# print(res)#<QuerySet [,]>  
#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 [,,,]>  
#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)#<QuerySet [,,]>  
#  
#2 res=models.Book.objects.filter(price__lte=555,price__gte=114)  
# print(res)#<QuerySet [,,,]>  
#3 res=models.Book.objects.filter(publishDate__year=2017)  
# print(res)#<QuerySet []>  
#4 res=models.Book.objects.filter(title__startswith='水')  
# print(res)#<QuerySet []>  
#5 res=models.Book.objects.filter(title__contains='小')  
# print(res)#<QuerySet []>

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。