如何使自动递增整数字段Django [英] How to make an auto increment integer field Django

问题描述

问题很简单，我正在订购购物车，我需要做一个自动递增的字段，当订单。但是我不知道如何使整数字段自动递增：S任何帮助。

order.py

  class Order（models.Model）：
 cart = models.ForeignKey（Cart）
 add_date = models.DateTimeField（auto_now_add = True）
 order_number = models.IntegerField（）
 enable = models.BooleanField（default = True）
  

解决方案

在Django中
1：将会有一个自动递增的名称为id的默认字段。

2：您可以将任何字段定义为自动增量字段使用 AutoField
字段。

 
 class Order（models.Model）：
 auto_increment_id = models.AutoField（primary_key = True）
＃你使用primary_key = True如果您不想使用django给您的模型的默认字段id
 

db design

 
 + ------------ + ------------------ -------------------------------------------------- -------------------------------------------------- ----------------------------------------- + 
 |表|创建表| 
 + ------------ + -------------------------------- -------------------------------------------------- -------------------------------------------------- --------------------------- + 
 | core_order | CREATE TABLE`core_order`（
`auto_increment_id` int（11）NOT NULL AUTO_INCREMENT，
 PRIMARY KEY（`auto_increment_id`）
）ENGINE = InnoDB DEFAULT CHARSET = latin1 | 
 + ------------ + -------------------------------- -------------------------------------------------- -------------------------------------------------- --------------------------- + 
 1列（0.01秒）
 

如果要使用django的默认ID作为增量字段。

 
 class Order（models 。$）
 dd_date = models.DateTimeField（auto_now_add = True）
 

db设计

 
 + ------------- + --------------------- -------------------------------------------------- -------------------------------------------------- ---------------------------------------- + 
 |表|创建表| 
 + ------------- + ------------------------------- -------------------------------------------------- -------------------------------------------------- ------------------------------ + 
 | core_order | CREATE TABLE`core_order`（
`id` int（11）NOT NULL AUTO_INCREMENT，
`dd_date` datetime NOT NULL，
 PRIMARY KEY（`id`）
）ENGINE = InnoDB DEFAULT CHARSET = latin1 | 
 + ------------- + ------------------------------- -------------------------------------------------- -------------------------------------------------- ------------------------------ + 
 

the question is simple, I am making an order for shopping cart and I need to make a field that auto increments when the order is made. But I don't know how to make the integer field auto increment :S any help.

order.py

class Order(models.Model):
    cart = models.ForeignKey(Cart)
    add_date = models.DateTimeField(auto_now_add=True)
    order_number = models.IntegerField()
    enable = models.BooleanField(default=True)

解决方案

In Django 1 : There will be a default field with name "id" which is auto increment .
2 : You can define any field as auto increment field using AutoField field.

class Order(models.Model):
    auto_increment_id = models.AutoField(primary_key=True)
    #you use primary_key = True if you do not want to use default field "id" given by django to your model

db design

+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table      | Create Table                                                                                                                                                  |
+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
| core_order | CREATE TABLE `core_order` (
  `auto_increment_id` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`auto_increment_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

If you want to use django's default id as increment field .

class Order(models.Model):
    dd_date = models.DateTimeField(auto_now_add=True)

db design

+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table       | Create Table                                                                                                                                                    |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| core_order | CREATE TABLE `core_order` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `dd_date` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+

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