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Data store / JSON problem!?

Asked by
LuaQuest 450 Moderation Voter
9 years ago

I recently read more in depth about how data store works on the roblox wiki, and found that each key is limited to about 2^16 string characters of data (64 kibibytes). Which means using JSON on tables depends on how big the table is, which causes a HUGE problem for my project.

Here's an example:

local player_data = {}

local http = game:GetService("HttpService")
local data = game:GetService("DataStoreService"):GetDataStore("Test")
data:SetAsync("player_info", http:JSONEncode(player_data))

print(data:GetAsync("player_info") and "Data found" or "Data not found") -- Result is as expected

for i = 1,2^16 do
table.insert(player_data, '.')
end

data:SetAsync("player_info",http:JSONEncode(player_data)) -- Says value is to large!

print(data:GetAsync("player_info") and "Data found" or "Data not found")

Please help! This means things like chat logs saving, complex stats saving, and anything else that involves a lot of memory to be stored based off players is very limited! Is there any way around this?

1 answer

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0
Answered by
Vlatkovski 320 Moderation Voter
9 years ago

You could always create a table, separate the string into multiple parts and insert them into the table.

local player_data = {}

local http = game:GetService("HttpService")
local data = game:GetService("DataStoreService"):GetDataStore("Test")


function split_string(str)
    local length = 2^16
    local result = {}

    for i=1, #str do
        if i % length == 0 then -- check if "i" is divisible by length
            local string_part = str:sub(i-length, i) -- or string.sub(string_part, i-length, i)
            result[#result + 1] = string_part -- table.insert uses too much memory compared to this :)
        end
    end

    return result
end


for i=1, 2^16 do
    player_data[#player_data + 1] = '.'
end

player_data = split_string(player_data)

data:SetAsync("player_info", http:JSONEncode(player_data))

To read it:

local player_data = data:GetAsync("player_info") and "Data found" or "Data not found")

for index, value in next, http:JSONDecode(player_data) do
    print(index, value)
end
2
Thanks for the answer, but i still get the same result: "Value is to large" :/ LuaQuest 450 — 9y
0
Change the part's size to (2^16)-1 in stead of 2^16? Vlatkovski 320 — 9y
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