A plurality of separate read and write operations database Django

Create a database:

      

= DATABASES {
     ' default ' : {
         ' ENGINE ' : ' django.db.backends.mysql ' ,
         ' NAME ' : ' default ' ,
         ' the HOST ' : ' 127.0.0.1 ' ,   # operation of the main server IP 
        ' PORT ' : 3306,    # run the port master of 
        ' the uSER ' : ' root ' ,   # user name of the primary server 
        'PASSWORD' : ' 123456 ' ,   # password master server 

    }, 
    ' Slave ' : {
         ' ENGINE ' : ' django.db.backends.mysql ' ,
         ' NAME ' : ' Slave ' ,
         ' the HOST ' : ' 127.0.0.1 ' ,
         ' PORT ' : 3306 ,
         ' the USER ' : ' the root ',
        'PASSWORD': '123456',

    }
}

 Models built table:

from django.db Import Models 

# the Create your Models here Wallpaper. 
class Article This article was (models.Model): 

    # verbose_name Chinese display of the field in the admin 
    title = models.CharField (64-max_length = )
     # Abstract 
    desc = models.CharField (max_length = 255)

Database Migration:

manage.py makemigrations Python   # In migrations folder generated record 

Python manage.py the migrate --database default   # default parameters can not write 

Python manage.py the migrate --database Slave   # migrate from the library once, you can build on it same table

Created in the app project db_router.py file and define a routing database class in the file for read and write separation, this class provides a maximum of four methods, namely: db_for_read, , db_for_write, allow_relation, allow_migratejust write the following three .

class MasterSlaveDBRouter (Object):
     "" " database from the master routing isolated read " "" 
 
    DEF db_for_read (Self, Model, ** hints):
         "" " Read Database " "" 
        return  " Slave " 
 
    DEF db_for_write (Self, Model, ** hints):
         "" " write database " "" 
        return  " default " 
 
    DEF allow_relation (Self, obj1, obj2, ** hints):
         "" " whether to run the association operation " "" 
        return True　　

Note configured in settings.py in:

DATABASE_ROUTERS = ["app001.db_router.MasterSlaveDBRouter"]

View function can operate:

DEF the Write (Request): 
    models.Article.objects.create (title = ' Dream of Red Mansions ' , desc = ' Good ' ) 
     # using a using ( 'default') may specify the database
     return HttpResponse ( ' Write Success ' ) 


DEF the Read (Request) : 
    obj = models.Article.objects.filter (title = ' Journey ' ) .first ()
     Print (obj.title)
     return the HttpResponse ( " read successful " )