Python Django双工作台接头

我使用了

$python manage.py inspectdb

从MSSQL中获取以下表格，Book表格可能有很多图片，因此我检查了它的forignkey的Mpeg表格

在foreignkey=book\u id

model.py

class Book(models.Model):
    book_id = models.AutoField(db_column='book_id', primary_key=True)  # Field name made lowercase.
    book_name = models.CharField(db_column='book_name', max_length=100, blank=True, null=True)  # Field name made lowercase.   
    media = models.CharField(max_length=200, blank=True, null=True)
    class Meta:
        db_table = 'book'

class Mpeg(models.Model):
    picture_id = models.AutoField(primary_key=True)
    picture_name = models.CharField(max_length=50)
    picture_type = models.CharField(max_length=50)
    picture_url = models.CharField(max_length=100)
    foreignkey = models.IntegerField(db_column='foreignKey')  # Field name made lowercase.
    class Meta:
        db_table = 'mpeg'

def map_player_post(request, book_id):
    book = models.Book.objects.get(book_id = book_id)
    mpeg = models.Mpeg.objects.all() #Tried filter but failed
    template = get_template('map.html')
    request_context = RequestContext(request)
    request_context.push(locals())
    if book != None:
        html = template.render(request_context)
        return HttpResponse(html)

视图.py

class Book(models.Model):
    book_id = models.AutoField(db_column='book_id', primary_key=True)  # Field name made lowercase.
    book_name = models.CharField(db_column='book_name', max_length=100, blank=True, null=True)  # Field name made lowercase.   
    media = models.CharField(max_length=200, blank=True, null=True)
    class Meta:
        db_table = 'book'

class Mpeg(models.Model):
    picture_id = models.AutoField(primary_key=True)
    picture_name = models.CharField(max_length=50)
    picture_type = models.CharField(max_length=50)
    picture_url = models.CharField(max_length=100)
    foreignkey = models.IntegerField(db_column='foreignKey')  # Field name made lowercase.
    class Meta:
        db_table = 'mpeg'

def map_player_post(request, book_id):
    book = models.Book.objects.get(book_id = book_id)
    mpeg = models.Mpeg.objects.all() #Tried filter but failed
    template = get_template('map.html')
    request_context = RequestContext(request)
    request_context.push(locals())
    if book != None:
        html = template.render(request_context)
        return HttpResponse(html)

模板

<h4>{{book.mpeg.count}}</h4> //get the book count

{{book.mpeg.count}}//获取图书计数

书桌上可能有许多图片

为此，您必须在

Mpeg

模型中使用一个，如下所示：

class Mpeg(models.Model):
    picture_id = models.AutoField(primary_key=True)
    picture_name = models.CharField(max_length=50)
    picture_type = models.CharField(max_length=50)
    picture_url = models.CharField(max_length=100)
    book = models.ForeignKey('Book', models.CASCADE)
    # remove the foreignkey = models.IntegerField(db_column='foreignKey')

    class Meta:
        db_table = 'mpeg'

book = Book.objects.get(book_id=book_id)
mpeg = Mpeg.objects.filter(book=book)

book = Book.objects.get(id=book_id)
mpeg = Mpeg.objects.filter(book=book)

现在运行

/manage.py makemigrations

和

/manage.py migrate

，然后（当然，在填充一些数据之后）可以执行如下查询：

class Mpeg(models.Model):
    picture_id = models.AutoField(primary_key=True)
    picture_name = models.CharField(max_length=50)
    picture_type = models.CharField(max_length=50)
    picture_url = models.CharField(max_length=100)
    book = models.ForeignKey('Book', models.CASCADE)
    # remove the foreignkey = models.IntegerField(db_column='foreignKey')

    class Meta:
        db_table = 'mpeg'

book = Book.objects.get(book_id=book_id)
mpeg = Mpeg.objects.filter(book=book)

book = Book.objects.get(id=book_id)
mpeg = Mpeg.objects.filter(book=book)

[奖金]：您可以删除

图片id

和

图书id

字段，因为Django将自动为您添加

id

。然后你可以像这样重写上面的表达式：

class Mpeg(models.Model):
    picture_id = models.AutoField(primary_key=True)
    picture_name = models.CharField(max_length=50)
    picture_type = models.CharField(max_length=50)
    picture_url = models.CharField(max_length=100)
    book = models.ForeignKey('Book', models.CASCADE)
    # remove the foreignkey = models.IntegerField(db_column='foreignKey')

    class Meta:
        db_table = 'mpeg'

book = Book.objects.get(book_id=book_id)
mpeg = Mpeg.objects.filter(book=book)

book = Book.objects.get(id=book_id)
mpeg = Mpeg.objects.filter(book=book)

---

class

是python中的保留关键字！！尝试为变量使用另一个名称。好的，我举了一个错误的示例。我改名字。