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並前往https://stackoverflow.com/questions/21364251/how-to-do-null-nil-check-in-lua-with-redis-scripto-and-redis-db

how to do null \ nil check in LUA with redis-scripto and redis DB?

Redis ' GET method never returns nil, but it returns a boolean value (false) if no key exists. ... If you play around with it a bit more, you'll see that you can ...

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