根据keyspace获取databases num时，需要加1

[feiazifeiazi]

fix #2570

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.86%. Comparing base (f8e1f4b) to head (d760a77).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2573      +/-   ##
==========================================
+ Coverage   76.82%   76.86%   +0.04%     
==========================================
  Files         117      117              
  Lines       16073    16084      +11     
==========================================
+ Hits        12348    12363      +15     
+ Misses       3725     3721       -4     

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[LeoQuote]

加 mock 就好了啊，你正好还可以测试下你的case

[feiazifeiazi]

加 mock 就好了啊，你正好还可以测试下你的case

本地单元测试时，总是报这个错。 “报auth_group表不存在。”
加的单元测试，都测不了。。好烦。

2024-04-10 18:14:34,861 - environ.environ - WARNING - Invalid line: AUTH_LDAP_ALWAYS_UPDATE_USER = True
2024-04-10 18:14:35,020 - archery.settings - INFO - 当前生效的外部认证方式：LDAP
2024-04-10 18:14:35,020 - archery.settings - INFO - 认证后端：('django_auth_ldap.backend.LDAPBackend', 'django.contrib.auth.backends.ModelBackend')
============================= test session starts =============================
platform win32 -- Python 3.11.2, pytest-8.1.1, pluggy-1.4.0
django: version: 4.1.10, settings: archery.settings (from ini)
rootdir: d:\Users\Administrator\Source\Workspaces\Archery_Genuine2
configfile: pyproject.toml
plugins: django-4.8.0, mock-3.14.0
collected 1 item

sql\engines\tests.py
Got an error creating the test database: (1007, "Can't create database 'test_archery'; database exists")
E

=================================== ERRORS ====================================
_____________ ERROR at setup of TestRedis.test_get_all_databases ______________

self = <django.db.backends.utils.CursorWrapper object at 0x0000025B59F3F2D0>
sql = 'ALTER TABLE sql_users_groups ADD CONSTRAINT sql_users_groups_group_id_d572a82e_fk_auth_group_id FOREIGN KEY (group_id) REFERENCES auth_group (id)'
params = ()
ignored_wrapper_args = (False, {'connection': , 'cursor': <django.db.backends.utils.CursorWrapper object at 0x0000025B59F3F2D0>})

def _execute(self, sql, params, *ignored_wrapper_args):
    self.db.validate_no_broken_transaction()
    with self.db.wrap_database_errors:
        if params is None:
            # params default might be backend specific.
            return self.cursor.execute(sql)
        else:

          return self.cursor.execute(sql, params)

c:\Users\Administrator\archery_venv\Lib\site-packages\django\db\backends\utils.py:89:

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[LeoQuote]

100% 覆盖率👏