SQLite数据库备份

Question

For backup of SQLite database, I went through https://www.sqlite.org/backup.html I came to know that there is one python wrapper over these SQLite online backup APIs.So, I went through https://github.com/husio/python-sqlite3-backup Here are some doubts that I have about sqlitebck(python package)

1. I checked out the code in tests, it shows db is copied from :memory: to file and vice versa using sqlitebck.copy(:memory:,dbfile), I am confused about ":memory:" and its use.
2. Instead from memory, can I copy one database file to other database file like sqlitebck(dbfile1, dbfile2). so that dbfile2 will be the backup of dbfile1?

Answer 1

':memory:' as a "filename" is how you tell sqlite to keep a small DB in memory rather than on-disk. But yes, sqlitebck is fine to copy from file to file -- though the arguments it takes are sqlite connections so you'd need to sqlite3.connect to each file first (and usually might as well just copy the file directly w/o involving sqlite -- as the sqlite page you link to implies, suggesting Unix cp or Windows copy ... Python has its own standard library module for file copies, https://docs.python.org/2/library/shutil.html ).