我是一名学生,我被分配到一个项目,我正在使用Django + PostgreSQL,我应该制作一个CLI(命令行界面)可能与Django显示我的数据库模块。最简单的方法是什么?我只对C ++编程有一些了解,所以我在想一个switch语句,用户可以选择不同的查询,但我不知道如何在Django中做到这一点。
谢谢 :)
如果要访问数据库shell,只需运行./manage.py dbshell
。但是如果你想直接从命令行显示你的表,你可以使用custom django management命令,但显示表与Django无关,而不是仅使用python的SQL查询。例如:
你可以在any_django_app/management/commands
中添加一个新的python文件,并将其命名为show_tables.py
,在其中,输入以下代码:
from django.core.management.base import BaseCommand, CommandError
from django.db import DEFAULT_DB_ALIAS, connections
class Command(BaseCommand):
help = (
"Shows DB tables, also you can pass your DATABASE NAME through this command"
)
requires_system_checks = False
def add_arguments(self, parser):
parser.add_argument(
'--database', default=DEFAULT_DB_ALIAS,
help='Nominates a database onto which to open a shell. Defaults to the "default" database.',
)
def handle(self, **options):
connection = connections[options['database']]
try:
cursor = connection.cursor()
cursor.execute("""SELECT table_name FROM information_schema.tables
WHERE table_schema = 'public'""")
for table in cursor.fetchall():
print(table[0])
except OSError:
# Note that we're assuming OSError means that the client program
# isn't installed. There's a possibility OSError would be raised
# for some other reason, in which case this error message would be
# inaccurate. Still, this message catches the common case.
raise CommandError(
'You appear not to have the %r program installed or on your path.' %
connection.client.executable_name
)
现在,运行./manage.py show_tables
,然后它将显示数据库中的表。