如何知道Django中数据库的当前名称？

Question

我正在django项目中编写测试。现在，我有两个数据库连接：

(settings.py)
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'db_name'
        ...
    },
}

和自定义连接到MongoDB：

import sys
from pymongo import Connection
from pymongo.errors import ConnectionFailure
try:
    connection = Connection(host="localhost", port=27017)
    db = connection['db_name']
    print "Connected successfully(Mongo, db_name)"
except ConnectionFailure, e:
    sys.stderr.write("Could not connect to MongoDB: %s" % e)
    sys.exit(1)

我想知道我的项目何时运行

python manage.py test myapp

因为在运行测试时，django会自动创建单独的数据库（名称类似于 test_db_name ），但是在这种情况下，Mongo仍将使用
db_name 运行。我试过了：

import sys
from pymongo import Connection
from pymongo.errors import ConnectionFailure
from django.db import connections

try:
    connection = Connection(host="localhost", port=27017)
    db_name = connections['default'].settings_dict['NAME']
    db = connection[db_name]
    print "Connected successfully(Mongo, %s)" % (db_name,)
except ConnectionFailure, e:
    sys.stderr.write("Could not connect to MongoDB: %s" % e)
    sys.exit(1)

但它不起作用

Answer 1

要获取具有最新Django版本（尝试使用1.8）的数据库名称：

from django.db import connection
db_name = connection.settings_dict['NAME']
# Or alternatively
# db_name = connection.get_connection_params()['db']

请注意在初始化后读取此值，以便在运行单元测试时它具有正确的值。