【数据存储】变量快照比对：跨天数据变更的追踪存储设计

local WATCH = { "GEM_CHIP", "TITLE_CNT", "PKVAL" }
setontimerex(104, 86400)
function ontimer104()
    local dayTag = os.date("%m%d")
    for _, actor in ipairs(onlineList()) do
        local buf = ""
        for _, k in ipairs(WATCH) do
            buf = buf .. k .. "=" .. tostring(getplayvar(actor, 2, k) or "") .. ";"
        end
        setplayvarex(actor, "SNAP_" .. dayTag, buf, 1)
    end
end

local function diffSnapshots(actor, dayA, dayB)
    local player = class(actor)
    local a, b = {}, {}
    for pair in string.gmatch(getplayvar(actor, 2, "SNAP_" .. dayA) or "", "[^;]+") do
        local k, v = string.match(pair, "(%w+)=(.*)")
        a[k] = v
    end
    for pair in string.gmatch(getplayvar(actor, 2, "SNAP_" .. dayB) or "", "[^;]+") do
        local k, v = string.match(pair, "(%w+)=(.*)")
        b[k] = v
    end
    for k, va in pairs(a) do
        if b[k] ~= va then
            sendluamsg(actor, 9301, 0, 0, 0, k .. ":" .. va .. "->" .. tostring(b[k]))
        end
    end
end