Python - Django - ORM common field

Auto Field:

int auto increment, must fill in the parameters primary_key = True

If you do not write AutoField, it will automatically create a column called id column

from django.db import models


class Person(models.Model):
    id = models.AutoField(primary_key=True)   # 自增的 id 主键

 

CharField：

Character type, you must provide max_length parameters, max_length represents the maximum character length

from django.db import models


class Person(models.Model):
    id = models.AutoField(primary_key=True)   # 自增的 id 主键
    name = models.CharField(max_length=32)

 

IntegerField：

Integer type, the range -2147483648 2147483647

from django.db import models


class Person(models.Model):
    id = models.AutoField(primary_key=True)   # 自增的 id 主键
    name = models.CharField(max_length=32)
    age = models.IntegerField()

 

DateField：

Date field, the date format YYYY-MM-DD, corresponding to the Python datetime.date ()

from django.db import models


class Person(models.Model):
    id = models.AutoField(primary_key=True)   # 自增的 id 主键
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    birthday = models.DateField(auto_now_add=True)

DatetimeField, DateField, TimeField three time fields, can be set auto_now_add, auto_now properties

auto_now_add = True, it will create a data record when the current time is assigned to the field

auto_now = True, then, each time updating the data record will be used to update the field

DateTimeField：

Time field, the format YYYY-MM-DD HH: MM [: ss [.uuuuuu]] [TZ], corresponding to the Python A datetime.datetime ()

 

Excuting an order:

manage.py@mysite2 > makemigrations app01
manage.py@mysite2 > migrate app01

To look over database

adding data

Add only name, age field

DateField add date of this data