标签：bsp pre values save list contains gate 大于等于 查询
1.类名.objects.create(属性=值，属性=值)
Myomodel.objects.create(name="TeacherCang",age=15)
2.d={"属性":"值"} obj=类名(**d) obj.save()
d={"name":"Money","age":11}
obj=Myomodel(**d)
obj.save()
3.obj=类名() obj.属性=值 obj.save()
obj=Myomodel() obj.name="Child" obj.age=9 obj.save()
1.单个删除：类名.objects.get(属性=值).delete()
Myomodel.objects.get(id=8).delete()
2.批量删除：类名.objects.filter(条件).delete()
Myomodel.objects.filter(age__lt=16).delete()
1.单个修改：查 改 存
obj=Myomodel.objects.get(id=1) obj.name="xiugai" obj.save()
2.批量修改：类名.objects.filter(条件).update(属性=值)
Myomodel.objects.filter(name="money").update(name="amaoagou")
Myomodel.objects.all()#<QuerySet [<Myomodel: Myomodel object (1)>]>Myomodel.objects.values()#<QuerySet [{‘id‘: 1, ‘name‘: ‘xiugai‘, ‘age‘: 16}]>Myomodel.objects.values(‘id‘,‘age‘)#<QuerySet [{‘id‘: 1, ‘age‘: 16}]>Myomodel.objects.values_list()#<QuerySet [(1, ‘xiugai‘, 16)]>Myomodel.objects.values_list(‘name‘)#<QuerySet [(‘xiugai‘,), (‘Jerry‘,)]>Myomodel.objects.filter(name="amaoagou")#<QuerySet [<Myomodel: Myomodel object (10)>]>
查询：过滤查询：类名.objects.filter(属性__查询谓词=值)#此处是双下划线
查询谓词：
1.exact 等值查询
2.contains 模糊查询，相当于like "%xx%"
3.in 模糊查询
4.gt 大于
5.lt 小于
6.gte 大于等于
7.lte 小于等于
8.startswith 以...开始，相当于like "x%"
9.endwith 以...结束，相当于like "%x"
10.range 相当于between and
11.regex 正则表达式匹配
Myomodel.objects.filter(name__startswith="Kai")#<QuerySet [<Myomodel: Myomodel object (4)>]>Myomodel.objects.filter(name__contains="cher")#<QuerySet [<Myomodel: Myomodel object (9)>]>
查询：条件取反：类名.objects.exclude(条件)
Myomodel.objects.exclude(name__contains="cher")#<QuerySet [<Myomodel: Myomodel object (1)>]>
查询：排序查询：类名.objects.order_by(条件)
默认是升序，字段名前加“-”即可降序排列
Myomodel.objects.order_by(‘age‘).values_list(‘age‘) #<QuerySet [(11,), (11,), (15,), (15,), (16,), (19,), (23,), (36,), (36,)]>Myomodel.objects.order_by(‘-age‘).values_list(‘age‘) # < QuerySet[(36,), (36,), (23,), (19,), (16,), (15,), (15,), (11,), (11,)] >Myomodel.objects.order_by(‘-age‘,‘-id‘).values_list(‘age‘,‘id‘) #<QuerySet [(36, 14), (36, 11), (23, 4), (19, 3), (16, 1), (15, 12), (15, 9), (11, 13), (11, 10)]>
只查询一条：类名.objects.get(条件)
Myomodel.objects.get(id=14)#Myomodel object (14)
获取查询数量
Myomodel.objects.filter(name="TeacherCang").count()#2
聚合查询
from django.db.models import Avg,Sum,Count,Max,Min
.........................
Myomodel.objects.aggregate(age=Avg(‘age‘))
Myomodel.objects.aggregate(age=Sum(‘age‘))
Myomodel.objects.aggregate(age=Count(‘age‘))
Myomodel.objects.aggregate(age=Max(‘age‘))
Myomodel.objects.aggregate(age=Min(‘age‘))
标签：bsp pre values save list contains gate 大于等于 查询
原文地址：https://www.cnblogs.com/pfeiliu/p/11930828.html
