如何在 redis 键命令中应用“或"条件 [英] How to apply 'OR' condition in redis keys command

问题描述

例如

keys X 'or' Y

应该打印

1)X
2)Y

推荐答案

不，你不能直接用 KEYS 或 SCAN 来做，因为模式匹配他们提供的不支持.

No, you can't do it directly with KEYS nor with SCAN, as the pattern matching that they offer does not support that.

但是，您可以使用 Lua 脚本来执行此操作:

You can, however, use a Lua script to do that:

local dict = {}

while (#ARGV > 0) do
    local pattern = table.remove(ARGV,1)
    local cursor = 0
    repeat
        local r = redis.call('SCAN',cursor,'MATCH',pattern)
        cursor = tonumber(r[1])
        while (#r[2] > 0) do
            dict[table.remove(r[2],1)] = true
        end
    until cursor == 0
end

local reply = {}
for k,v in pairs(dict) do
    reply[#reply+1] = k
    dict[k] = nil
end

return reply

示例输出:

$ redis-cli KEYS "*"
1) "bazfoo"
2) "bar2"
3) "foo1"
4) "qazbar"
$ redis-cli --eval scanor.lua , "foo*" "bar*"
1) "bar2"
2) "foo1"

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