圆月山庄资源网

Django多数据库配置及逆向生成model教程
脚本专栏 2024/11/2 佚名
3 2
圆月山庄资源网 Design By www.vgjia.com

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。

标签：
Django,数据库配置,逆向生成,model
圆月山庄资源网 Design By www.vgjia.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！ 如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
圆月山庄资源网 Design By www.vgjia.com
www.vgjia.com 圆月山庄资源网
139,976互联网资源
144,792高清电影
21,817无损音乐
631,128技术资源
一句话新闻
苹果官宣WWDC 2024！预计会有大批AI功能 - 2024/11/2

3月27日消息，苹果宣布2024年全球开发者大会（WWDC）将于6月10日至6月14日举行，巧合的是，这次大会与端午假期重合。

苹果官方表示：

在线参加 Apple 每年规模最大的开发者盛会。亲眼见证 Apple 最新平台、技术和工具的发布。了解如何创建和改进你的 App 和游戏。与 Apple 设计师和工程师互动交流，与全球开发者社区建立联系。以上活动均免费在线举行。

探索各种新的工具、框架和功能，助力你打造出理想的 App 和游戏。通过视频讲座学习新技能，与 Apple 专家进行一对一会面，以推进你的项目，完善你的构思。

Swift Student Challenge 旨在支持和鼓舞下一代开发者、创作者和企业家。太平洋时间 3 月 28 日，我们将公布今年的获奖者名单。获奖者将有资格参加在 Apple Park 举办的特别活动。我们还会选出 50 名杰出获胜者，他们将受邀前往库比提诺，获得为期三天的非凡体验，包括参加 Apple Park 的特别活动。

RTX 5090要首发 性能要翻倍！三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB，每个模块容量为2GB。其速度预设为32 Gbps（PAM3），但也可以降至28 Gbps，以提高产量和初始阶段的整体性能和成本效益。

据三星表示，GDDR7内存的能效将提高20%，同时工作电压仅为1.1V，低于标准的1.2V。通过采用更新的封装材料和优化的电路设计，使得在高速运行时的发热量降低，GDDR7的热阻比GDDR6降低了70%。

更新日志

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接