更新时间:2023-02-10 23:38:23
在Django
1中:我们有默认字段,名称为 id
2:您可以使用 AutoField
字段定义一个自动递增字段。
1 : we have default field with name "id" which is auto increment.
2 : You can define a 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
+------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 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)
class Order(models.Model):
dd_date = models.DateTimeField(auto_now_add=True)
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 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 |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+