django之创建第8个项目-数据库配置及同步研究

Posted 2020-07-04 Xiao|Deng

1、sqlitestudio-2.1.5数据库可视化工具--百度云盘下载 

2、编写C:\djangoweb\helloworld\blog\models.py文件
# Create your models here.
#coding:utf-8
from django.db import models
class Student(models.Model):
    name=models.CharField(max_length=50)
    age=models.IntegerField()


3、配置C:\djangoweb\helloworld\helloworld\setting.py的DATABASES变量
DATABASES = {
    ‘default‘: {
        ‘ENGINE‘: ‘django.db.backends.sqlite3‘, # Add ‘postgresql_psycopg2sqlite3‘, ‘mysql‘, ‘sqlite3‘ or ‘oracle‘.
        ‘NAME‘: ‘test.db‘,                      # Or path to database file if using sqlite3.
        # The following settings are not used with sqlite3:
        ‘USER‘: ‘‘,
        ‘PASSWORD‘: ‘‘,
        ‘HOST‘: ‘‘,                      # Empty for localhost through domain sockets or ‘127.0.0.1‘ for localhost through TCP.
        ‘PORT‘: ‘‘,                      # Set to empty string for default.
    }
}


4、同步数据库（之前创建数据库删掉）
c:\djangoweb\helloworld>manage.py syncdb
Creating tables ...
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table django_admin_log
Creating table blog_student

You just installed Django‘s auth system, which means you don‘t have any superuse
rs defined.
Would you like to create one now? (yes/no): no        #是否创建超级用户？这里我选择了no
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)
c:\djangoweb\helloworld>


5、C:\djangoweb\helloworld\blog\models.py文件新增intime数据类型
# Create your models here.
#coding:utf-8

from django.db import models
class Student(models.Model):
    name=models.CharField(max_length=50)
    age=models.IntegerField()
    intime=models.DateTimeField()  #新增

6、数据库同步，将新增的model中的内容更新到数据库中
【注意事项】
    1）这里需要删除掉之前的数据库中对应的表再同步数据库（鼠标右键点击blog_student表，在下拉菜单中选择“删除表”），
    2）尽量不要直接删除数据库，如果里面有数据那么就完蛋了
c:\djangoweb\helloworld>manage.py syncdb


7、反向同步数据库
1）在sqlite3可视化工具中添加新的数据类型，给student添加sex数据类型数据
2）新增teacher表，并创建id和name2个数据类型
3）执行反向同步数据库，manage.py inspectdb
4）效果：
c:\djangoweb\helloworld>manage.py inspectdb
# This is an auto-generated Django model module.
# You‘ll have to do the following manually to clean this up:
#     * Rearrange models‘ order
#     * Make sure each model has one field with primary_key=True
# Feel free to rename the models, but don‘t rename db_table values or field na
s.
#
# Also note: You‘ll have to insert the output of ‘django-admin.py sqlcustom [a
name]‘
# into your database.
from __future__ import unicode_literals

from django.db import models

class AuthGroup(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=80, unique=True)
    class Meta:
        db_table = ‘auth_group‘

class AuthGroupPermissions(models.Model):
    id = models.IntegerField(primary_key=True)
    group_id = models.IntegerField()
    permission = models.ForeignKey(‘AuthPermission‘)
    class Meta:
        db_table = ‘auth_group_permissions‘

class AuthPermission(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    content_type_id = models.IntegerField()
    codename = models.CharField(max_length=100)
    class Meta:
        db_table = ‘auth_permission‘

class AuthUser(models.Model):
    id = models.IntegerField(primary_key=True)
    password = models.CharField(max_length=128)
    last_login = models.DateTimeField()
    is_superuser = models.BooleanField()
    username = models.CharField(max_length=30, unique=True)
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)
    email = models.CharField(max_length=75)
    is_staff = models.BooleanField()
    is_active = models.BooleanField()
    date_joined = models.DateTimeField()
    class Meta:
        db_table = ‘auth_user‘

class AuthUserGroups(models.Model):
    id = models.IntegerField(primary_key=True)
    user_id = models.IntegerField()
    group = models.ForeignKey(AuthGroup)
    class Meta:
        db_table = ‘auth_user_groups‘

class AuthUserUserPermissions(models.Model):
    id = models.IntegerField(primary_key=True)
    user_id = models.IntegerField()
    permission = models.ForeignKey(AuthPermission)
    class Meta:
        db_table = ‘auth_user_user_permissions‘

class BlogStudent(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    age = models.IntegerField()
    intime = models.DateTimeField()
    sex = models.IntegerField()
    class Meta:
        db_table = ‘blog_student‘

class DjangoAdminLog(models.Model):
    id = models.IntegerField(primary_key=True)
    action_time = models.DateTimeField()
    user = models.ForeignKey(AuthUser)
    content_type = models.ForeignKey(‘DjangoContentType‘, null=True, blank=Tru

    object_id = models.TextField(blank=True)
    object_repr = models.CharField(max_length=200)
    action_flag = models.PositiveSmallIntegerField()
    change_message = models.TextField()
    class Meta:
        db_table = ‘django_admin_log‘

class DjangoContentType(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=100)
    app_label = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    class Meta:
        db_table = ‘django_content_type‘

class DjangoSession(models.Model):
    session_key = models.CharField(max_length=40, unique=True)
    session_data = models.TextField()
    expire_date = models.DateTimeField()
    class Meta:
        db_table = ‘django_session‘

class DjangoSite(models.Model):
    id = models.IntegerField(primary_key=True)
    domain = models.CharField(max_length=100)
    name = models.CharField(max_length=50)
    class Meta:
        db_table = ‘django_site‘

class Teacher(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    class Meta:
        db_table = ‘teacher‘
c:\djangoweb\helloworld>


8、修改C:\djangoweb\helloworld\blog\models.py文件
# Create your models here.
#coding:utf-8
from django.db import models
"""
class Student(models.Model):
    name=models.CharField(max_length=50)
    age=models.IntegerField()
    intime=models.DateTimeField()
"""
#修改为：
class Student(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    age = models.IntegerField()
    intime = models.DateTimeField()
    sex = models.IntegerField()
    class Meta:
        db_table = ‘student‘

9、删除“blog_student”表并同步数据库manage.py syncdb


10、将数据类型等信息输出到models.py文件中
1）manage.py inspectdb > blog/models.py
2）查看models文件内容(删除多余后的效果)：
from django.db import models
class Student(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    age = models.IntegerField()
    intime = models.DateTimeField()
    sex = models.IntegerField()
    class Meta:
        db_table = ‘student‘

class Teacher(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=50)
    class Meta:
        db_table = ‘teacher‘

 

百度云盘：django之创建第8个项目-数据库配置及同步研究