需求
models对表的增删改查
知识点
1、基础操作
1.1 增
方法一
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models.Tb1.objects.create(c1='xx', c2='oo') #增加一条数据
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dic = {'c1':'xx','c2':'oo'}
models.Tb1.objects.creat(**dic) #可以接受字典类型数据 **kwargs
form提交的数据就是字典类型，可以直接当做参数**dic传给models增加数据。
方法二
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obj = models.Tb1(c1='xx', c2='oo')
obj.save()
1.2 查
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models.Tb1.objects.get(id=123) # 获取单条数据，不存在则报错（不建议使用）
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models.Tb1.objects.all() # 获取全部，它是一个Django的查询对象；取第一条.first()；取列成字典.values('username')；取列成列表.value_list()
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models.Tb1.objects.filter(name='seven') # 获取指定条件的数据
1.3 删
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models.Tb1.objects.filter(name='seven').delete() # 删除指定条件的数据
1.4 改
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models.Tb1.objects.filter(name='seven').update(gender='0') # 将指定条件的数据更新，均支持 **kwargs
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obj = models.Tb1.objects.get(id=1)
obj.c1 = '111'
obj.save() # 修改单条数据,不常用
2、进阶操作
2.1 获取个数
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models.Tb1.objects.filter(name='seven').count()
2.2 大于，小于
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models.Tb1.objects.filter(id__gt=1) # 获取id大于1的值，（两个双下划线）
models.Tb1.objects.filter(id__lt=10) # 获取id小于10的值
models.Tb1.objects.filter(id__lt=10, id__gt=1) # 获取id大于1 且 小于10的值
2.3 in
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models.Tb1.objects.filter(id__in=[11, 22, 33]) # 获取id等于11、22、33的数据
models.Tb1.objects.exclude(id__in=[11, 22, 33]) # not in
2.4 contains
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models.Tb1.objects.filter(name__contains="ven")
models.Tb1.objects.filter(name__icontains="ven") # icontains大小写不敏感
models.Tb1.objects.exclude(name__icontains="ven")
2.5 range
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models.Tb1.objects.filter(id__range=[1, 2]) # 范围bettwen and
2.6 其他类似
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startswith，istartswith, endswith, iendswith,
2.7 order by
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models.Tb1.objects.filter(name='seven').order_by('id') # asc，从小到大排列
models.Tb1.objects.filter(name='seven').order_by('-id') # desc，从大到小排列
2.8 limit 、offset
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models.Tb1.objects.all()[10:20] #分页用
2.9 group by
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from django.db.models import Count, Min, Max, Sum #个数，最小，最大，求和
models.Tb1.objects.filter(c1=1).values('id').annotate(c=Count('num')) #annotate=grounp by，比如id为1的num列的个数
#SELECT "app01_tb1"."id", COUNT("app01_tb1"."num") AS "c" FROM "app01_tb1" WHERE "app01_tb1"."c1" = 1 GROUP BY "app01_tb1"."id"
详细
1、增
models.py
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class SimpleModel(models.Model):
username = models.CharField(max_length=64)
password = models.CharField(max_length=64)
views.py
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def index(request):
dic = {"username":"user1","password":"123"}
models.SimpleModel.objects.create(**dic)
obj= HomeForm.ImportForm(request.POST)
return render(request,'home/index.html',{'obj':obj})
2、查
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def index(request):
ret = models.SimpleModel.objects.all()
print ret #[<SimpleModel: SimpleModel object>, ]对象的列表
print type(ret) #<class 'django.db.models.query.QuerySet'>
print ret.query #SELECT "id", "username","password" FROM "app01_simplemodel"
print models.SimpleModel.objects.all().values("username")
#[{'username': u'user1'}, {'username': u'user2'}, {'username': u'user3'}]
print models.SimpleModel.objects.all().values_list("id","username")
#[(1, u'user1'), (2, u'user2'), (3, u'user3')]
#正是form--select的格式
obj = HomeForm.ImportForm(request.POST)
return render(request,'home/index.html',{'obj':obj})
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models.Tb1.objects.create(c1='xx', c2='oo') #增加一条数据
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dic = {'c1':'xx','c2':'oo'}
models.Tb1.objects.creat(**dic) #可以接受字典类型数据 **kwargs
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obj = models.Tb1(c1='xx', c2='oo')
obj.save() |
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models.Tb1.objects.get(id=123) # 获取单条数据，不存在则报错（不建议使用）
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models.Tb1.objects.all() # 获取全部，它是一个Django的查询对象；取第一条.first()；取列成字典.values('username')；取列成列表.value_list()
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models.Tb1.objects.filter(name='seven') # 获取指定条件的数据
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models.Tb1.objects.filter(name='seven').delete() # 删除指定条件的数据
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models.Tb1.objects.filter(name='seven').update(gender='0') # 将指定条件的数据更新，均支持 **kwargs
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obj = models.Tb1.objects.get(id=1)
obj.c1 = '111'
obj.save() # 修改单条数据,不常用
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models.Tb1.objects.filter(name='seven').count()
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models.Tb1.objects.filter(id__gt=1) # 获取id大于1的值，（两个双下划线）
models.Tb1.objects.filter(id__lt=10) # 获取id小于10的值
models.Tb1.objects.filter(id__lt=10, id__gt=1) # 获取id大于1 且 小于10的值
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models.Tb1.objects.filter(id__in=[11, 22, 33]) # 获取id等于11、22、33的数据
models.Tb1.objects.exclude(id__in=[11, 22, 33]) # not in
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models.Tb1.objects.filter(name__contains="ven")
models.Tb1.objects.filter(name__icontains="ven") # icontains大小写不敏感
models.Tb1.objects.exclude(name__icontains="ven")
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models.Tb1.objects.filter(id__range=[1, 2]) # 范围bettwen and
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startswith，istartswith, endswith, iendswith, |
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models.Tb1.objects.filter(name='seven').order_by('id') # asc，从小到大排列
models.Tb1.objects.filter(name='seven').order_by('-id') # desc，从大到小排列
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models.Tb1.objects.all()[10:20] #分页用
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from django.db.models import Count, Min, Max, Sum #个数，最小，最大，求和
models.Tb1.objects.filter(c1=1).values('id').annotate(c=Count('num')) #annotate=grounp by，比如id为1的num列的个数
#
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1、增
models.py
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class SimpleModel(models.Model):
username = models.CharField(max_length=64)
password = models.CharField(max_length=64)
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views.py
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def index(request):
dic = {"username":"user1","password":"123"}
models.SimpleModel.objects.create(**dic)
obj= HomeForm.ImportForm(request.POST)
return render(request,'home/index.html',{'obj':obj})
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2、查
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def index(request):
ret = models.SimpleModel.objects.all()
print ret #[<SimpleModel: SimpleModel object>, ]对象的列表
print type(ret) #<class 'django.db.models.query.QuerySet'>
print ret.query #SELECT "id", "username","password" FROM "app01_simplemodel"
print models.SimpleModel.objects.all().values("username")
#[{'username': u'user1'}, {'username': u'user2'}, {'username': u'user3'}]
print models.SimpleModel.objects.all().values_list("id","username")
#[(1, u'user1'), (2, u'user2'), (3, u'user3')]
#正是form--select的格式
obj = HomeForm.ImportForm(request.POST)
return render(request,'home/index.html',{'obj':obj})
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