django2 多数据配置 sql server 2012+从已有数据库生成model.py

1.配置多数据库(sqlite + sql server 2012)

连接sql server 需要安装 django-pyodbc-azure

pip install django-pyodbc-azure

　

参考文章: https://blog.csdn.net/zongzhengyingzhe/article/details/80867256

新增 database_router.py 

from django.conf import settings
DATABASE_MAPPING = settings.DATABASE_APPS_MAPPING
class DatabaseAppsRouter(object):
    """
    A router to control all database operations on models for different
    databases.

    In case an app is not set in settings.DATABASE_APPS_MAPPING, the router
    will fallback to the `default` database.

    Settings example:

    DATABASE_APPS_MAPPING = {'app1': 'db1', 'app2': 'db2'}
    """

    def db_for_read(self, model, **hints):
        """"Point all read operations to the specific database."""
        print(DATABASE_MAPPING[model._meta.app_label])
        if model._meta.app_label in DATABASE_MAPPING:
            return DATABASE_MAPPING[model._meta.app_label]
        return None

    def db_for_write(self, model, **hints):
        """Point all write operations to the specific database."""
        print(model._meta.app_label+"?")
        print(DATABASE_MAPPING[model._meta.app_label])
        if model._meta.app_label in DATABASE_MAPPING:
            return DATABASE_MAPPING[model._meta.app_label]
        return None

    def allow_relation(self, obj1, obj2, **hints):
        """Allow any relation between apps that use the same database."""
        db_obj1 = DATABASE_MAPPING.get(obj1._meta.app_label)
        db_obj2 = DATABASE_MAPPING.get(obj2._meta.app_label)
        if db_obj1 and db_obj2:
            if db_obj1 == db_obj2:
                return True
            else:
                return False
        return None

    def allow_syncdb(self, db, model):
        """Make sure that apps only appear in the related database."""

        if db in DATABASE_MAPPING.values():
            return DATABASE_MAPPING.get(model._meta.app_label) == db
        elif model._meta.app_label in DATABASE_MAPPING:
            return False
        return None

    def allow_migrate(self, db, app_label, model=None, **hints):
        """
        Make sure the auth app only appears in the 'auth_db'
        database.
        """
        if db in DATABASE_MAPPING.values():
            return DATABASE_MAPPING.get(app_label) == db
        elif app_label in DATABASE_MAPPING:
            return False
        return None

修改 app>model.py

# 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
#   * Make sure each ForeignKey has `on_delete` set to the desired behavior.
#   * Remove `managed = False` lines if you wish to allow Django to create, modify, and delete the table
# Feel free to rename the models, but don't rename db_table values or field names.
from django.db import models

class AppAuthor(models.Model):
    name = models.CharField(max_length=100)

class AppBook(models.Model):
    name = models.CharField(max_length=100)
    author_email = models.CharField(max_length=75)
    imported = models.BooleanField()
    published = models.DateField(blank=True, null=True)
    price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    user_id = models.IntegerField(blank=True, null=True)

class AppBookCategories(models.Model):
    book_id = models.IntegerField()

class AppCategory(models.Model):
    name = models.CharField(max_length=100)

class AppCoursemanage(models.Model):
    uuid = models.CharField(primary_key=True, max_length=22)
    add_time = models.DateTimeField()
    modified_time = models.DateTimeField()
    del_state = models.IntegerField()
    remote_id = models.CharField(max_length=30)
    status = models.SmallIntegerField()

class DjangoMigrations(models.Model):
    app = models.CharField(max_length=255)
    name = models.CharField(max_length=255)
    applied = models.DateTimeField()

修改配置 settings.py

# Database
# https://docs.djangoproject.com/en/2.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }, 'xhydb':
        {
            'ENGINE': 'sql_server.pyodbc',
            'NAME': 'django1',  # 数据库的名字
            'USER': 'sa',  # 登录数据库的用户名
            'PASSWORD': '123456',  # 登录数据库的密码
            'HOST': 'localhost',  # 数据库的IP地址
            'PORT': '1433',  # 数据库的端口
            'OPTIONS':
                {
                    'driver': 'SQL Server Native Client 11.0',  # 注意，不行就试试11.0
                    'MARS_Connection': True,
                }
        }
}

DATABASE_ROUTERS = ['BatchPrinting.database_router.DatabaseAppsRouter'] # 数据库路由
DATABASE_APPS_MAPPING = {
    'admin': 'default',
    'auth': 'default',
    'contenttypes': 'default',
    'sessions': 'default',
    'django': 'default',
    'app': 'xhydb',
}

执行数据库迁移

python manage.py makemigrations

python manage.py migrate

python manage.py migrate --database=xhydb

Sql server 运行效果

sqlite 效果

2.从现有数据库生成model.py

python manage.py inspectdb --database=xhydb > app/models.py

python manage.py inspectdb 表名 > app/models.py