Redis hmget与通配符字段 [英] redis hmget with wildcard fields

问题描述

我在redis中有一个哈希集，如下所示.

I have a hashset in redis like below.

"abcd" : {
    "rec.number.984567": "value1",
    "rec.number.973956": "value2",
    "rec.number.990024": "value3",
    "rec.number.910842": "value4",
    "rec.number.910856": "...",
    "other.abcd.efgh": "some value",
    "other.xyza.blah": "some other value"
    "..." : "...",
    "..." : "...",
    "..." : "...",
    "..." : "..."
}

如果我叫hgetall abcd，它将为我提供哈希中的所有字段.我的目标是仅获取以"rec.number"开头的哈希集的那些字段.当我打电话给

if I call hgetall abcd, it will give me all fields in the hash. My objective is to get only those fields of the hashset that begin with "rec.number". When I call like

  redis-cli hmget "abcd" "rec.number*", 

它给我的结果是

1)

是否有一种方法只能检索那些以我期望的模式开头的键的数据?我只想检索那些键，因为我的数据集包含许多其他不相关的字段.

Is there a way to retrieve data for only those keys which start with my expected pattern? I want to retrieve only those keys because my dataset contains many other irrelevant fields.

推荐答案

HMGET 不支持通配符字段名称.您可以为此使用 HSCAN :

HMGET do not supports wildcard in field name. You can use HSCAN for that:

HSCAN abcd 0 MATCH rec.number*

有关官方文档.

此脚本通过LUA脚本实现:

This script does it in LUA scripting:

local rawData = redis.call('HGETALL', KEYS[1]);
local ret = {};

for idx = 1, #rawData, 2 do
    if string.match(rawData[idx], ARGV[1]) then
       hashData[rawData[idx]] = rawData[idx + 1];
    end 
end

可以在 Redis用户指南.

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