编程 Python

Django多数据库配置及逆向生成model教程

Posted in Python onMarch 28, 2020

在项目中我们每个app对应不同的数据库，其中有一个是从数据库逆向生成model，做个笔记。

1、修改项目的setting.py配置：

DATABASES = {
 'default': {
  'ENGINE': 'django.db.backends.mysql', # 默认用mysql
  'NAME': 'bk',      # 数据库名 (默认与APP_ID相同)
  'USER': 'root',      # 你的数据库user
  'PASSWORD': 'root',      # 你的数据库password
  'HOST': 'xxx.xxx.xxx.xxx',     # 开发的时候，使用localhost
  'PORT': '3306',      # 默认3306
 },
 'cloudsino_test': {
   'ENGINE': 'django.db.backends.mysql', # 默认用mysql
   'NAME': 'cloudsino_test',      # 数据库名 (默认与APP_ID相同)
   'USER': 'root',      # 你的数据库user
   'PASSWORD': 'root',      # 你的数据库password
   'HOST': 'xxx.xxx.xxx.xxx',     # 开发的时候，使用localhost
   'PORT': '3306',      # 默认3306
  },
}

# 设置数据库的路由规则方法
DATABASE_ROUTERS = ['conf.database_router.DatabaseAppsRouter']

# 设置APP对应的数据库路由表，哪个app要连接哪个数据库，没有指定会用default那个。
DATABASE_APPS_MAPPING = {
 # example:
 #'app_name':'database_name',
 'home_application': 'cloudsino_test',
 'cmdb': 'default',
}

2、新建database_router.py：

在与setting.py文件同级的目录下新建database_router.py文件：

# -*- coding: utf-8 -*-
from settings_development import DATABASE_APPS_MAPPING

DATABASE_MAPPING = DATABASE_APPS_MAPPING


class DatabaseAppsRouter(object):
 def db_for_read(self, model, **hints):
  """"建议model类型对象从哪一个数据库读取."""
  if model._meta.app_label in DATABASE_MAPPING:
   return DATABASE_MAPPING[model._meta.app_label]
  return None

 def db_for_write(self, model, **hints):
  """建议model类型对象的写入操作应该使用哪个数据库"""
  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.
  	如果obj1 和obj2 之间应该允许关联则返回True，如果应该防止关联则返回False，如果路由无法判断则返回None
  """
  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.
  定义迁移操作是否允许在别名为db的数据库上运行。如果操作应该运行则返回True ，如果不应该运行则返回False，如果路由无法判断则返回None。
  """
  if db in DATABASE_MAPPING.values():
   return DATABASE_MAPPING.get(app_label) == db
  elif app_label in DATABASE_MAPPING:
   return False
  return None

3.逆向生成model：

在terminal中输入以下命令，使用名为cloudsino_test的DATABASE来逆向生成model到home_application这个app的models.py：

python manage.py inspectdb --database=cloudsino_test > home_application/models.py

Django多数据库配置及逆向生成model教程

逆向生成的model：

# 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
# * 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.
#
# Also note: You'll have to insert the output of 'django-admin sqlcustom [app_label]'
# into your database.
from __future__ import unicode_literals

from django.db import models


class CloudsinoCpuinfo(models.Model):
 corenumber = models.CharField(max_length=128)
 frequency = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 name = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 device = models.ForeignKey('CloudsinoDevice', blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_cpuinfo'


class CloudsinoDevice(models.Model):
 sn = models.CharField(max_length=128)
 app = models.CharField(max_length=128)
 business_chargeby1 = models.CharField(max_length=128)
 business_chargeby2 = models.CharField(max_length=128)
 chargeby1 = models.CharField(max_length=128)
 chargeby2 = models.CharField(max_length=128)
 description = models.CharField(max_length=128)
 device_status = models.CharField(max_length=128)
 devicename = models.CharField(max_length=128)
 field1 = models.CharField(max_length=128)
 field2 = models.CharField(max_length=128)
 field3 = models.CharField(max_length=128)
 field4 = models.CharField(max_length=128)
 field5 = models.CharField(max_length=128)
 frame_posiniton = models.CharField(max_length=128)
 framename = models.CharField(max_length=128)
 ip = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 model = models.CharField(max_length=128)
 os = models.CharField(max_length=128)
 position_desc = models.CharField(max_length=128)
 roomarea = models.CharField(max_length=128)
 roomname = models.CharField(max_length=128)
 servicetag = models.CharField(max_length=128)
 shape = models.CharField(max_length=128)
 specification = models.CharField(max_length=128)
 subtype = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 ucount = models.CharField(max_length=128)

 class Meta:
  managed = False
  db_table = 'cloudsino_device'


class CloudsinoDevicetype(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 status = models.CharField(max_length=128)

 class Meta:
  managed = False
  db_table = 'cloudsino_devicetype'


class CloudsinoDiskinfo(models.Model):
 bus = models.CharField(max_length=128)
 formfactor = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 media = models.CharField(max_length=128)
 name = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 size = models.CharField(max_length=128)
 speed = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_diskinfo'


class CloudsinoFaninfo(models.Model):
 index = models.CharField(max_length=128)
 name = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_faninfo'


class CloudsinoHbacardinfo(models.Model):
 name = models.CharField(max_length=128)
 wwnn = models.CharField(max_length=128)
 wwpn = models.CharField(max_length=128)
 fc_switch = models.CharField(max_length=128)
 switch_port = models.CharField(max_length=128)
 switch_mac = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_hbacardinfo'


class CloudsinoManageinfo(models.Model):
 assetcode = models.CharField(max_length=128)
 department = models.CharField(max_length=128)
 express_code = models.CharField(max_length=128)
 service_level = models.CharField(max_length=128)
 shutdown_level = models.CharField(max_length=128)
 usage = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_manageinfo'


class CloudsinoManufacturertype(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 status = models.CharField(max_length=128)

 class Meta:
  managed = False
  db_table = 'cloudsino_manufacturertype'


class CloudsinoMemory(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 frequency = models.CharField(max_length=128)
 size = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 memoryinfo = models.ForeignKey('CloudsinoMemoryinfo', blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_memory'


class CloudsinoMemoryinfo(models.Model):
 max_dimmslots = models.CharField(max_length=128)
 mem_totalsize = models.CharField(max_length=128)
 memmax_capacitysize = models.CharField(max_length=128)
 populated_dimmslots = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_memoryinfo'


class CloudsinoNetworkinfo(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 mac = models.CharField(max_length=128)
 speed = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_networkinfo'


class CloudsinoOobnetwork(models.Model):
 ip = models.CharField(max_length=128)
 netmask = models.CharField(max_length=128)
 gateway = models.CharField(max_length=128)
 mac = models.CharField(max_length=128)
 ethernet_switch = models.CharField(max_length=128)
 swith_port = models.CharField(max_length=128)
 swith_mac = models.CharField(max_length=128)
 distribution_frame = models.CharField(max_length=128)
 distribution = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_oobnetwork'


class CloudsinoPciecard(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 loc = models.CharField(max_length=128)
 online_state = models.CharField(max_length=128)
 conntype = models.CharField(max_length=128)
 bandwidth = models.CharField(max_length=128)
 speed = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_pciecard'


class CloudsinoPowerinfo(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 model = models.CharField(max_length=128)
 outputpower = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_powerinfo'


class CloudsinoProductnetwork(models.Model):
 ip = models.CharField(max_length=128)
 netmask = models.CharField(max_length=128)
 gateway = models.CharField(max_length=128)
 mac = models.CharField(max_length=128)
 os = models.CharField(max_length=128)
 remote_type = models.CharField(max_length=128)
 remote_port = models.CharField(max_length=128)
 ethernet_switch = models.CharField(max_length=128)
 swith_port = models.CharField(max_length=128)
 swith_mac = models.CharField(max_length=128)
 distribution_frame = models.CharField(max_length=128)
 distribution = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_productnetwork'


class CloudsinoPurchasewarrantyinfo(models.Model):
 date_manuf = models.CharField(max_length=128)
 expiredate = models.CharField(max_length=128)
 price = models.CharField(max_length=128)
 purchase_order = models.CharField(max_length=128)
 purchase_order_name = models.CharField(max_length=128)
 purchase_supply = models.CharField(max_length=128)
 serviceagent = models.CharField(max_length=128)
 warrantyitem = models.CharField(db_column='warrantyItem', max_length=128) # Field name made lowercase.
 warrantyperiod = models.CharField(db_column='warrantyPeriod', max_length=128) # Field name made lowercase.
 warrantystartdate = models.CharField(db_column='warrantyStartDate', max_length=128) # Field name made lowercase.
 warrantytype = models.CharField(db_column='warrantyType', max_length=128) # Field name made lowercase.
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_purchasewarrantyinfo'


class CloudsinoRaidinfo(models.Model):
 name = models.CharField(max_length=128)
 type = models.CharField(max_length=128)
 cachesize = models.CharField(max_length=128)
 speed = models.CharField(max_length=128)
 manufacturer = models.CharField(max_length=128)
 partnumber = models.CharField(max_length=128)
 serialnumber = models.CharField(max_length=128)
 index = models.CharField(max_length=128)
 device = models.ForeignKey(CloudsinoDevice, blank=True, null=True)

 class Meta:
  managed = False
  db_table = 'cloudsino_raidinfo'


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

 class Meta:
  managed = False
  db_table = 'django_migrations'

补充知识：Django使用数据库生成模型类

正常的开发流程

在models.py中定义模型类，要求继承自models.Model

把应用加入settings.py文件的installed_app项

生成迁移文件

执行迁移生成表

使用模型类进行crud操作

使用数据库生成模型类

python manage.py inspectdb > app_name/models.py

例如：

python manage.py inspectdb > booktest/models.py

以上这篇Django多数据库配置及逆向生成model教程就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持三水点靠木。

Django多数据库配置及逆向生成model教程

- Author -

qq_43776053

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

Python 相关文章推荐

python获取糗百图片代码实例

Dec 18 Python

PHP网页抓取之抓取百度贴吧邮箱数据代码分享

Apr 13 Python

Linux 下 Python 实现按任意键退出的实现方法

Sep 25 Python

python3+PyQt5实现自定义流体混合窗口部件

Apr 24 Python

让Django支持Sql Server作后端数据库的方法

May 29 Python

python利用Tesseract识别验证码的方法示例

Jan 21 Python

pyqt5与matplotlib的完美结合实例

Jun 21 Python

详解python中的index函数用法

Aug 06 Python

python 3.7.4 安装 opencv的教程

Oct 10 Python

基于Python中random.sample()的替代方案

May 23 Python

如何教少儿学习Python编程

Jul 10 Python

python从ftp获取文件并下载到本地

Dec 05 Python

后端开发使用pycharm的技巧(推荐)

Mar 27 #Python

如何基于python3和Vue实现AES数据加密

Mar 27 #Python

python小程序基于Jupyter实现天气查询的方法

Mar 27 #Python

Python实现的北京积分落户数据分析示例

Mar 27 #Python

Pyspark获取并处理RDD数据代码实例

Mar 27 #Python

Python Django中的STATIC_URL 设置和使用方式

Mar 27 #Python

Python爬虫爬取、解析数据操作示例

Mar 27 #Python