这样做的目的是避免使用空数据时出现的死锁。
This is done to avoid deadlocks while working with an empty database.
如果该数据库不存在,则创建一个空数据库。
If the database does not exist, an empty database is created.
所以,如果您肯定那个空数据库中存在数据,请检查是否有录入错误。
So, if you are sure there was data in that empty database, check for typing errors.
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