我想知道如何在django项目中运行这个sql代码：
> SELECT * FROM COLETA INNER JOIN TRANSDUTOR ON COLETA.id_transdutor =
> TRANSDUTOR.id_transdutor INNER JOIN USER ON TRANSDUTOR.id_user =
> USER.id_user
请注意，我有3个表（COLETA，TRANSDUTOR，USER），我想通过您的外键关联它们。
USER表与TRANSDUTOR表有一对多的关系，而TRANSDUTOR表与COLETA表有一对多的关系。
我看到了一些与Django相关的SELECT-RELATED，有人知道如何使用它吗？
models.py：
class User(AbstractBaseUser, PermissionsMixin):
email = models.EmailField(_('email address'), unique=True)
first_name = models.CharField(_('first name'), max_length=30, blank=True)
last_name = models.CharField(_('last name'), max_length=30, blank=True)
date_joined = models.DateTimeField(_('date joined'), auto_now_add=True)
is_active = models.BooleanField(_('active'), default=True)
is_staff = models.BooleanField(_('staff'), default=True)
avatar = models.ImageField(upload_to='dashboard/static/avatars/', null=True, blank=True)
objects = UserManager()
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = []
class Meta:
verbose_name = _('user')
verbose_name_plural = _('users')
def get_full_name(self):
'''
Returns the first_name plus the last_name, with a space in between.
'''
full_name = '%s %s' % (self.first_name, self.last_name)
return full_name.strip()
def get_short_name(self):
'''
Returns the short name for the user.
'''
return self.first_name
def email_user(self, subject, message, from_email=None, **kwargs):
'''
Sends an email to this User.
'''
send_mail(subject, message, from_email, [self.email], **kwargs)
class UserManager(BaseUserManager):
use_in_migrations = True
def _create_user(self, email, password, **extra_fields):
"""
Creates and saves a User with the given email and password.
"""
if not email:
raise ValueError('The given email must be set')
email = self.normalize_email(email)
user = self.model(email=email, **extra_fields)
user.set_password(password)
user.save(using=self._db)
return user
def create_user(self, email, password=None, **extra_fields):
extra_fields.setdefault('is_superuser', False)
return self._create_user(email, password, **extra_fields)
def create_superuser(self, email, password, **extra_fields):
extra_fields.setdefault('is_superuser', True)
if extra_fields.get('is_superuser') is not True:
raise ValueError('Superuser must have is_superuser=True.')
return self._create_user(email, password, **extra_fields)
class Concessionaria(models.Model):
nome = models.CharField(max_length=255)
hp_inicio = models.DateTimeField('hp inicio')
hp_fim = models.DateTimeField('hp fim')
def __str__(self):
return self.nome
class Cliente_has_concessionaria(models.Model):
id_cliente = models.ForeignKey(User, on_delete=models.CASCADE)
id_concessionaria = models.ForeignKey(Concessionaria, on_delete=models.CASCADE)
class Classificacao(models.Model):
nome = models.CharField(max_length=255)
id_concessionaria = models.ForeignKey(Concessionaria, on_delete=models.CASCADE)
def __str__(self):
return self.nome
class Transdutor(models.Model):
data_instalacao = models.DateTimeField('Data instalacao')
numero_serie = models.CharField(max_length=255)
chave_api = models.CharField(max_length=25, default='', blank=False) #T TODO: precisamos verificar se KEY cadastrado existe em algum equipamento
id_cliente = models.ForeignKey(User, on_delete=models.CASCADE)
id_classificacao = models.ForeignKey(Classificacao, on_delete=models.CASCADE)
parametro_a = models.FloatField(max_length=255, null=True)
parametro_b = models.FloatField(max_length=255, null=True)
hora_ponto_inicio = models.TimeField('Hora inicio')
hora_ponto_fim = models.TimeField('Hora fim')
nome_io6 = models.CharField(max_length=255)
nome_io7 = models.CharField(max_length=255, blank=True)
nome_io8 = models.CharField(max_length=255, blank=True)
nome_io9 = models.CharField(max_length=255, blank=True)
nome_io10 = models.CharField(max_length=255, blank=True)
nome_io11 = models.CharField(max_length=255, blank=True)
nome_io12 = models.CharField(max_length=255, blank=True)
def __str__(self):
return (self.chave_api)
class Servico(models.Model):
descricao = models.CharField(max_length=255)
valor = models.CharField(max_length=255)
id_classificacao = models.ForeignKey(Classificacao, on_delete=models.CASCADE)
def __str__(self):
return self.descricao
class Coleta(models.Model):
data_leitura = models.DateTimeField(null=True) # TODO: MUdar isso depois
io6 = models.FloatField(max_length=255, null=True)
calculo_io6 = models.FloatField(max_length=255, null=True)
media_io6 = models.FloatField(max_length=255, null=True)
io7 = models.FloatField(max_length=255, null=True)
calculo_io7 = models.FloatField(max_length=255, null=True)
media_io7 = models.FloatField(max_length=255, null=True)
io8 = models.FloatField(max_length=255, null=True)
calculo_io8 = models.FloatField(max_length=255, null=True)
media_io8 = models.FloatField(max_length=255, null=True)
io9 = models.FloatField(max_length=255, null=True)
io10 = models.FloatField(max_length=255, null=True)
io11 = models.FloatField(max_length=255, null=True)
io12 = models.FloatField(max_length=255, null=True)
parametro_a = models.FloatField(max_length=255, null=True)
parametro_b = models.FloatField(max_length=255, null=True)
id_transdutor = models.ForeignKey(Transdutor, on_delete=models.CASCADE, null=True)
class Conta_contrato(models.Model):
conta_contrato = models.CharField(max_length=255)
id_cliente = models.ForeignKey(User, on_delete=models.CASCADE)
class Imposto(models.Model):
nome = models.CharField(max_length=255)
estado = models.CharField(max_length=255)
valor = models.CharField(max_length=255)
def __str__(self):
return self.nome
class Constante(models.Model):
nome = models.CharField(max_length=255)
valor = models.CharField(max_length=255)
def __str__(self):
return self.nome
views.py：
def my_custom_bad_request_view(request):
return render(request, '400.html', )
def my_custom_permission_denied_view(request):
return render(request, '403.html', )
def my_custom_page_not_found_view(request):
return render(request, '404.html', )
def my_custom_error_view(request):
return render(request, '500.html', )
def index(request):
return render(request, 'dashboard/index.html')
def do_change_password(request):
if request.method == 'POST':
form = PasswordChangeForm(request.user, request.POST)
if form.is_valid():
user = form.save()
update_session_auth_hash(request, user) # Important!
messages.success(request, 'Your password was successfully updated!')
return redirect('change_password')
else:
messages.error(request, 'Please correct the error below.')
else:
form = PasswordChangeForm(request.user)
return render(request, 'dashboard/change_password.html', {
'form': form
})
@login_required
def graficos(request):
current_user = request.user
first_name = User.objects.values_list('first_name', flat=True).filter(pk=current_user.id)
last_name = User.objects.values_list('last_name', flat=True).filter(pk=current_user.id)
date_joined = User.objects.values_list('date_joined', flat=True).filter(pk=current_user.id)
context = {
'last_name': last_name,
'first_name': first_name,
'date_joined': date_joined,
}
return render(request, 'dashboard/graficos.html', context)
def printa(request):
coletas = Coleta.objects.all().order_by('-id')
transdutores = Transdutor.objects.filter(id_cliente=request.user.id)
io6_name = Transdutor.objects.values_list('nome_io6', flat=True).filter(id_cliente=request.user.id)
io7_name = Transdutor.objects.values_list('nome_io7', flat=True).filter(id_cliente=request.user.id)
io8_name = Transdutor.objects.values_list('nome_io8', flat=True).filter(id_cliente=request.user.id)
parametros = Transdutor.objects.all().filter(id_cliente=request.user.id).order_by('-id')
parametro_a = Transdutor.objects.values_list('parametro_a', flat=True).filter(id_cliente=request.user.id).order_by('-id').first()
parametro_b = Transdutor.objects.values_list('parametro_b', flat=True).filter(id_cliente=request.user.id).order_by('-id').first()
data = Coleta.objects.values_list('data_leitura', flat=True).filter(id_transdutor=1).order_by('-id')[:10]
context = {
'coletas': coletas,
'transdutores': transdutores,
'io6_name': io6_name,
'io7_name': io7_name,
'io8_name': io8_name,
'parametro_a': parametro_a,
'parametro_b': parametro_b,
'data': data,
}
return render(request, 'dashboard/print.html', context)
def do_login(request):
if request.method == 'GET':
if request.user.is_authenticated():
return render(request, 'dashboard/graficos.html')
if request.method == 'POST':
user = authenticate(username=request.POST['username'], password=request.POST['password'])
if user is not None:
if request.POST.get('lembrar', None) is not None:
request.session.set_expiry(
60 * 60 * 24 * 30 * 12) # Se selecionar o "lembrar-me" ficará logado por 1 ano
login(request, user)
return redirect('/graficos')
return render(request, 'dashboard/login.html')
def do_logout(request):
# return render(request, 'dashboard/logout.html')
logout(request)
return redirect('/login')
def consumo_mensal(request, *args, **kargs):
mes = request.GET['mes'] # TODO: avaliar a forma como isso ta sendo feito
dados = []
transdutores = Transdutor.objects.filter(id_cliente=request.user.id)
for t in transdutores:
coletas = Coleta.objects.filter(id_transdutor_id=t.id, data_leitura__month=mes).order_by('data_leitura')
for c in coletas:
# soma os valores dos canais
valores = [float(c.io6), float(c.io7), float(c.io8), float(c.io9), float(c.io10), float(c.io11),
float(c.io12)]
soma = sum(valores)
dia = int(c.data_leitura.day)
adicionado = False
for dado in dados:
if dado['Dia'] == dia:
novo_valor = float(dado['Consumo']) + soma
dado['Consumo'] = "%.4f" % novo_valor
adicionado = True
if not adicionado:
dados.append({'Dia': dia, 'Consumo': "%.4f" % soma})
return JsonResponse(dados, safe=False)
def consumo_mensal_por_setores(request, *args, **kargs):
#io6_name = Transdutor.objects.values_list('nome_io6', flat=True).filter(chave_api="hab0001")
data2 = [
{'value': 2554, 'label': 'Industria'},
{'value': 242, 'label': 'Oficina'},
{'value': 3233, 'label': 'Suprimento'},
{'value': 122, 'label': 'Outros Departamentos'}
]
return JsonResponse(data2, safe=False)
def gasto_mensal(request, *args, **kargs):
data3 = [
{'Dia': '01', 'Valor': 51333},
{'Dia': '02', 'Valor': 30222},
{'Dia': '03', 'Valor': 20442},
{'Dia': '04', 'Valor': 20123},
{'Dia': '05', 'Valor': 32333},
{'Dia': '06', 'Valor': 44963},
]
return JsonResponse(data3, safe=False)
def gasto_mensal_por_setores(request, *args, **kargs):
data = [
{'value': 12.22, 'label': 'Industria'},
{'value': 15.32, 'label': 'Oficina'},
{'value': 12.12, 'label': 'Suprimento'},
{'value': 51.30, 'label': 'Outros Departamentos'}
]
return JsonResponse(data, safe=False)
谢谢你们。
答案 0 :(得分：0)