Django 数据库

2018年1月27日作者张舫

1 blog/models.py开始编写一个数据模型类

from django.db import models
from django.utils import timezone
from django.contrib.auth.models import User

class BlogArticles(models.Model):
    title = models.CharField(max_length=300) #规定属性限制长度
    author = models.ForeignKey(User, related_name="blog_posts") #一个用户对应多个文章
    body = models.TextField()
    publish = models.DateTimeField(default=timezone.now)

    class Meta:
        ordering = ("-publish",) #规定实例对象的显示顺序

    def __str__(self):
        return self.title

from django.db import models

from django.utils import timezone

from django.contrib.auth.models import User

class BlogArticles(models.Model):

title = models.CharField(max_length=300) #规定属性限制长度

author = models.ForeignKey(User, related_name="blog_posts") #一个用户对应多个文章

body = models.TextField()

publish = models.DateTimeField(default=timezone.now)

class Meta:

ordering = ("-publish",) #规定实例对象的显示顺序

def __str__(self):

return self.title

2. 执行python manage.py makemigrations

python manage.py makemigrations

1	python manage.py makemigrations

会生成blog/migrations/0001_initial.py这个文件

from __future__ import unicode_literals

from django.conf import settings
from django.db import migrations, models
import django.db.models.deletion
import django.utils.timezone


class Migration(migrations.Migration):

    initial = True

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='BlogArticles',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('title', models.CharField(max_length=300)),
                ('body', models.TextField()),
                ('publish', models.DateTimeField(default=django.utils.timezone.now)),
                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='blog_posts', to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'ordering': ('-publish',),
            },
        ),
    ]

from __future__ import unicode_literals

from django.conf import settings

from django.db import migrations, models

import django.db.models.deletion

import django.utils.timezone

class Migration(migrations.Migration):

initial = True

dependencies = [

migrations.swappable_dependency(settings.AUTH_USER_MODEL),

]

operations = [

migrations.CreateModel(

name='BlogArticles',

fields=[

('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),

('title', models.CharField(max_length=300)),

('body', models.TextField()),

('publish', models.DateTimeField(default=django.utils.timezone.now)),

('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='blog_posts', to=settings.AUTH_USER_MODEL)),

options={

'ordering': ('-publish',),

]

3.执行python manage.py sqlmigrate blog 0001

python manage.py sqlmigrate blog 0001

1	python manage.py sqlmigrate blog 0001

将0001转化为sql语句

4.执行python manage.py migrate

python manage.py migrate

1	python manage.py migrate

创建数据库了

关于作者

张舫

好好学习天天向上