光标如何在Django中选择数据库

Question

I have a question for cursor in python, if I have more than one database in my settings and I want to open a cursor in a function that will export data to excel file with openpyxl. My question is how my cursor will know which database to connect and how this does it.

Thanks in advance

DATABASES  = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'default',
    'USER': 'postgres',
    'PASSWORD': 'xxxx',
    'HOST': '127.0.0.1',
    'PORT': '5432',
},
'test1': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'test1',
    'USER': 'postgres',
    'PASSWORD': 'xxxx',
    'HOST': '127.0.0.1',
    'PORT': '5433',
},
'test2': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'test2',
    'USER': 'postgres',
    'PASSWORD': 'xxxx',
    'HOST': '127.0.0.1',
    'PORT': '5432',
}
}

Answer 1

It will use the default database. If you need to use a different database use:

from django.db import connections
cursor = connections['my_db_alias'].cursor()

From the docs here .