Django多数据库配置及逆向生成model教程
作者：qq_43776053
这篇文章主要介绍了Django多数据库配置及逆向生成model教程，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧
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
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脚本之家。