内存存储排序映射

获取排序映射
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

{key: "player1", value: someValue1, sortKey: -1}
{key: "player2", value: someValue2, sortKey: 0}
{key: "player4", value: someValue3, sortKey: 1}
{key: "player5", value: someValue4, sortKey: 1}
{key: "player3", value: someValue5, sortKey: 3.14}
{key: "player6", value: someValue6, sortKey: "someString"}
{key: "player0", value: someValue7}
{key: "player7", value: someValue8}

向排序映射添加数据
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

local setSuccess, _ = pcall(function()
	return sortedMap:SetAsync("User_1234", 1000, 30, 3.14152)
end)
if setSuccess then
	print("设置成功。")
end

从排序映射获取特定键
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

local setSuccess, _ = pcall(function()
	return sortedMap:SetAsync("User_1234", 1000, 30, 3.14152)
end)
if setSuccess then
	print("设置成功。")
end

local item
local getSuccess, getError = pcall(function()
	item = sortedMap:GetAsync("User_1234")
end)
if getSuccess then
	print(item)
else
	warn(getError)
end

从排序映射获取键的范围
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

local lowerBound = {}
lowerBound["key"] = "10"
lowerBound["sortKey"] = 100
local upperBound = {}
upperBound["key"] = "50"
upperBound["sortKey"] = 500

-- 从开始获取最多20个项目
local getSuccess, items = pcall(function()
	return sortedMap:GetRangeAsync(
		Enum.SortDirection.Ascending, 20, lowerBound, upperBound)
end)
if getSuccess then
	for _, item in items do
		print(item.key)
		print(item.sortKey)
	end
end

在排序映射中更新玩家的排行榜分数
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("Leaderboard")

local function updateLeaderboard(itemKey, killsToAdd, deathsToAdd)
	local success, newStats, newScore = pcall(function()
		return sortedMap:UpdateAsync(itemKey, function(playerStats, playerScore)
			playerStats = playerStats or { kills = 0, deaths = 0 }
			playerStats.kills += killsToAdd
			playerStats.deaths += deathsToAdd
			if playerStats then
				-- `playerScore`是用于对映射中项进行排序的sortKey
				playerScore = playerStats.kills / math.max(playerStats.deaths, 1)
				return playerStats, playerScore
			end
			return nil
		end, 30)
	end)
	if success then
		print(newStats)
		print(newScore)
	end
end

从排序映射中移除一个键
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

local setSuccess, _ = pcall(function()
	return sortedMap:SetAsync("User_1234", 1000, 30, "someStringSortKey")
end)
if setSuccess then
	print("设置成功。")
end

local removeSuccess, removeError = pcall(function()
	sortedMap:RemoveAsync("User_1234")
end)
if not removeSuccess then
	warn(removeError)
end

删除排序映射中的内存
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

-- 初始下限为nil，从第一个项目开始刷新
local exclusiveLowerBound = nil

while true do
	-- 从当前下限开始获取最多一百个项目
	local getRangeSuccess, items = pcall(function()
		return sortedMap:GetRangeAsync(Enum.SortDirection.Ascending, 100, exclusiveLowerBound)
	end)
	if getRangeSuccess then
		local removeSuccess = true
		local removeError = nil

		for _, item in items do
			removeSuccess, removeError = pcall(function()
				sortedMap:RemoveAsync(item.key)
			end)
		end

		-- 如果删除项目时出现错误，则尝试用相同的排他性下限再次尝试
		if not removeSuccess then
			warn(removeError)
		-- 如果范围少于一百个项目，则已达到映射的终点
		elseif #items < 100 then
			break
		else
			-- 最后检索到的键是下一次迭代的排他性下限
			exclusiveLowerBound = {}
			exclusiveLowerBound["key"] = items[#items].key
			exclusiveLowerBound["sortKey"] = items[#items].sortKey
		end
	end
end

获取排序映射的大小
local MemoryStoreService = game:GetService("MemoryStoreService")

local sortedMap = MemoryStoreService:GetSortedMap("SortedMap1")

local setSuccess, _ = pcall(function()
	return sortedMap:SetAsync("User_1234", 1000, 30, 3.14152)
end)

if setSuccess then
	print("设置成功。")
end

local size
local success, sizError = pcall(function()
	size = sortedMap:GetSizeAsync()
end)

if success then
	print(size)
else
	warn(sizeError)
end