如果没有，我该怎么做才能改善它？目前只用13秒来评估我们的开发数据。 Raw SQL的想法？
suppliers = models.Supplier.objects.all().order_by('company')
for supplier in suppliers :
sup = {}
sup['company'] = supplier.company
sup['supplies'] = get_supplies(1, supplier.uuid)
sup['category'] = 'Supplier'
if isocode == None :
addresses = models.Address.objects.filter(company = supplier.company).iterator()
else :
addresses = models.Address.objects.filter(company = supplier.company, country_iso = isocode).iterator()
sup['contacts'] = list(models.Contact.objects.filter(address__in=addresses))
company_list.append(sup)
class SupplierManager(models.Manager):
def suppliers_for_panel(self, bought_in_control_panel_id):
return self.filter(supplies__bought_in_control_panel__id = bought_in_control_panel_id).filter(company__hidden=0).order_by('company__name')
class Supplier(models.Model):
uuid = UUIDField(primary_key=True)
company = models.ForeignKey(Company, db_column='company_uuid',null=True, blank=True)
sector = models.ForeignKey(CustomerSector, db_column='sector_uuid',null=True, blank=True,verbose_name=_('Sector'))
account_number = models.CharField(null=True, blank=True,max_length=255,verbose_name=_('Account No'))
reference = models.CharField(null=True, blank=True,max_length=255)
notes = models.TextField(null=True, blank=True)
date_created = models.DateTimeField(null=True, blank=True, auto_now_add=True)
date_modified = models.DateTimeField(null=True, blank=True, auto_now=True)
user = UserField(null=True, blank=True)
jms_code = models.CharField(null=True, blank=True,max_length=255)
objects = SupplierManager()
def __unicode__(self):
return self.company.name
class Meta:
db_table = 'supplier'
class Contact(models.Model):
uuid = UUIDField(primary_key=True)
address = models.ForeignKey(Address, db_column='address_uuid',null=True,blank=True,verbose_name=_('Address'))
title = models.ForeignKey(Title,db_column='title_uuid',null=True, blank=True)
forename = models.CharField(null=True, blank=True,max_length=255)
surname = models.CharField(null=True, blank=True,max_length=255)
position = models.CharField(null=True, blank=True,max_length=255)
mobile = models.CharField(null=True, blank=True,max_length=255)
direct_line = models.CharField(null=True, blank=True,max_length=255)
email = models.CharField(null=True, blank=True,max_length=255)
origin = models.IntegerField(null=True, blank=True)
lead_source = models.IntegerField(null=True, blank=True)
notes = models.TextField(null=True, blank=True)
contact_status = models.ForeignKey(ContactStatus, db_column='contact_status_uuid',verbose_name=_('Contact Status'))
contact_method = models.ForeignKey(ContactMethod, db_column='contact_method_uuid',verbose_name=_('Contact Method'))
date_created = models.DateTimeField(null=True, blank=True, auto_now_add=True)
date_modified = models.DateTimeField(null=True, blank=True, auto_now=True)
user = UserField(null=True, blank=True)
jms_code = models.CharField(null=True, blank=True,max_length=255)
allow_download = models.NullBooleanField(serialize=False)
is_modified = ModifiedField(serialize=False)
def __unicode__(self):
return self.get_full_name()
def get_full_name(self):
return self.forename + " " + self.surname
class Meta:
db_table = 'contact'
class Address(models.Model):
uuid = UUIDField(primary_key=True)
company = models.ForeignKey(Company, db_column='company_uuid',null=True,blank=True,verbose_name=_('Address'))
group_name = models.CharField(null=True, blank=False,max_length=255,verbose_name=_('Corporate Group'))
line1 = models.CharField(null=True, blank=False,max_length=255,verbose_name=_('Address Line 1'))
line2 = models.CharField(null=True, blank=True,max_length=255,verbose_name=_('Address Line 2'))
line3 = models.CharField(null=True, blank=True,max_length=255,verbose_name=_('Address Line 3'))
town = models.CharField(null=True, blank=True,max_length=255)
county = models.CharField(null=True, blank=True,max_length=255)
postcode = models.CharField(null=True, blank=True,max_length=255)
country_iso = models.CharField(null=True, blank=True,max_length=255)
telephone = models.CharField(null=True, blank=True,max_length=255)
fax = models.CharField(null=True, blank=True,max_length=255)
email = models.CharField(null=True, blank=True,max_length=255)
website = models.CharField(null=True, blank=True,max_length=255)
description = models.CharField(null=True, blank=True,max_length=255)
date_created = models.DateTimeField(null=True, blank=True, auto_now_add=True)
date_modified = models.DateTimeField(null=True, blank=True, auto_now=True)
user = UserField(null=True, blank=True)
jms_code = models.CharField(null=True, blank=True,max_length=255)
allow_download = models.NullBooleanField(serialize=False)
notes = models.CharField(null=True, blank=True,max_length=255)
is_modified = ModifiedField(serialize=False)
def __unicode__(self):
if self.description in [ '', None ] :
if self.line1 not in [ '', None ] :
return self.line1
return self.uuid
return self.description
def asList (self) :
return [ b for b in self.line1, self.line2, self.line3, self.town, self.county if b not in ('', None) ]
class Meta:
db_table = 'address'
verbose_name_plural = ('Addresses')
答案 0 :(得分：2)
首先，将.select_related('company')添加到初始供应商查询中。现在，每次访问循环中的supplier.company时，您都会发出一个额外的查询。
查询膨胀的其余部分来自单独选择Address和Contact。这是每次循环时必须发出的另外两个查询。如果您使用的是Django 1.4+，可以尝试使用prefetch_related来删除它们。如果您运行的是较小的版本，则可以尝试django-batch-select，它可以提供类似的功能。这可能需要对您的方法进行一些重新思考，找出一种方法来同时选择所有内容。
答案 1 :(得分：1)
可以重写为：
sup['contacts'] = models.Contact.objects.filter(address__in=addresses)
Sups会以Queryset对象结束，在您使用它时会对其进行评估。如果您确实需要列表，请执行以下操作，这将立即评估QuerySet并为您提供Python列表对象：
sup['contacts'] = list(models.Contact.objects.filter(address__in=addresses))
https://docs.djangoproject.com/en/dev/ref/models/querysets/#in https://docs.djangoproject.com/en/dev/ref/models/querysets/#when-querysets-are-evaluated
答案 2 :(得分：0)
sup['contacts'] = Contact.objects.filter(address__in=addresses)