Django MySql 后端每次使用连接时都会尝试评估 MySql 设置，但无法转换空字符串，即返回为整数。
当它这样做时，它会抛出如下错误（在这个例子中，我只是运行管理迁移命令）：
root@2d37585a3d96:/mealplanner/trunk# python manage.py migrate
Traceback (most recent call last):
File "manage.py", line 11, in <module>
execute_from_command_line(sys.argv)
File "/py36-default/lib/python3.6/site-packages/django/core/management/init.py", line 381, in execute_from_command_line
utility.execute()
File "/py36-default/lib/python3.6/site-packages/django/core/management/init.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/py36-default/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "/py36-default/lib/python3.6/site-packages/django/core/management/base.py", line 361, in execute
self.check()
File "/py36-default/lib/python3.6/site-packages/django/core/management/base.py", line 390, in check
include_deployment_checks=include_deployment_checks,
File "/py36-default/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 64, in runchecks
issues = run_checks(tags=[Tags.database])
File "/py36-default/lib/python3.6/site-packages/django/core/checks/registry.py", line 72, in run_checks
new_errors = check(app_configs=app_configs)
File "/py36-default/lib/python3.6/site-packages/django/core/checks/database.py", line 10, in check_database_backends
issues.extend(conn.validation.check(**kwargs))
File "/py36-default/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 9, in check
issues.extend(self._check_sql_mode(**kwargs))
File "/py36-default/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 13, in checksql_mode
with self.connection.cursor() as cursor:
File "/py36-default/lib/python3.6/site-packages/django/db/backends/base/base.py", line 256, in cursor
return self._cursor()
File "/py36-default/lib/python3.6/site-packages/django/db/backends/base/base.py", line 233, in _cursor
self.ensure_connection()
File "/py36-default/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/py36-default/lib/python3.6/site-packages/django/db/backends/base/base.py", line 197, in connect
self.init_connection_state()
File "/py36-default/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 231, in init_connection_state
if self.features.is_sql_auto_is_null_enabled:
File "/py36-default/lib/python3.6/site-packages/django/utils/functional.py", line 80, in get
res = instance.dict[self.name] = self.func(instance)
File "/py36-default/lib/python3.6/site-packages/django/db/backends/mysql/features.py", line 83, in is_sql_auto_is_null_enabled
cursor.execute('SELECT @@SQL_AUTO_IS_NULL')
File "/py36-default/lib/python3.6/site-packages/django/db/backends/utils.py", line 99, in execute
return super().execute(sql, params)
File "/py36-default/lib/python3.6/site-packages/django/db/backends/utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/py36-default/lib/python3.6/site-packages/django/db/backends/utils.py", line 76, in executewith_wrappers
return executor(sql, params, many, context)
File "/py36-default/lib/python3.6/site-packages/django/db/backends/utils.py", line 82, in _execute
return self.cursor.execute(sql)
File "/py36-default/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 71, in execute
return self.cursor.execute(query, args)
File "/py36-default/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/py36-default/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/py36-default/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/py36-default/lib/python3.6/site-packages/MySQLdb/cursors.py", line 413, in _query
self._post_get_result()
File "/py36-default/lib/python3.6/site-packages/MySQLdb/cursors.py", line 417, in postget_result
self._rows = self._fetch_row(0)
File "/py36-default/lib/python3.6/site-packages/MySQLdb/cursors.py", line 385, in fetchrow
return self._result.fetch_row(size, self._fetch_type)
ValueError: invalid literal for int() with base 10: ''
当我在 mysql 客户端中运行 SELECT @@SQL_AUTO_IS_NULL 时，我得到以下信息：
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 2.2.11-id64-release (95ae9a6)
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SELECT @@SQL_AUTO_IS_NULL;
+--------------------+
| @@sql_auto_is_null |
+--------------------+
| |
+--------------------+
1 row in set (0.00 sec)
所以看起来 Sphinx 返回一个空字符串，而后端期望可以转换为整数的东西。
是否有 sphinx 搜索配置/设置可以强制返回 MySql 后端期望的值？ 还有其他解决方案吗？