Django plurality of database connections and to achieve separate read and write

Separate read and write

The basic principle is to make the main transactional database processing add, change, delete operations (INSERT, UPDATE, DELETE) operation, while processing SELECT queries from the database, the database is used to copy things change operations resulting from other databases to synchronize to SQL, for example, the master database is responsible for writing data, reading data, read only responsible for reading data library, the library every write operation, synchronous update the library to read, to write a library, reading library can have multiple, synchronized using logs master database for data and synchronization of multiple databases

Specific configuration is as follows

Increase the allocation slave database in the configuration file

In the configuration file settings.py Django, DATABASES add the following code:

= {DATABASES 
    'default': { 
        'ENGINE': 'django.db.backends.mysql', 
        'the HOST': '127.0.0.1', run # master server IP 
        'PORT': 3306, master server running port # 
        'uSER': 'django', username # primary server 
        'pASSWORD': 'django', password # master server 
        'nAME': 'djangobase' # table name 
    }, 
    'Slave': { 
        'ENGINE': ' django.db.backends.mysql ',   
        ' the HOST ':' 127.0.0.1 ', 
        ' PORT ': 8306, 
        ' the USER ':' django_slave ', 
        ' PASSWORD ':' django_slave ', 
        ' NAME ':'djangobase_slave'
    }
}　　

Create a route classification database operations

Create db_router.py utils project files, and the definition of a class in the file db, used for separate read and write

MasterSlaveDBRouter class (Object): 
    "" "separate route from the master database to read and write" "" 

    DEF db_for_read (Self, Model, hints **): 
        "" "Read Database" "" 
        return "Slave" 

    DEF db_for_write (Self, Model, hints **): 
        "" "database write" "" 
        return "default" 

    DEF allow_relation (Self, obj1, obj2, hints **): 
        "" "associated with the operation is running" "" 
        return True　　

Configuring route separate read and write

Increase in the configuration file

# Set the separate read and write 
DATABASE_ROUTERS = [ 'item name .utils.db_router. "Custom class name' ']