You cannot Instance this class with Instance.new()
This class cannot be accessed by client sided scripts.
Maximum 30 requests can be made in a mintue.
When using this service in local playtest: Your datastore WILL be saved into your computers storage under the username given by local server. Check workshop settings to disable this or to clear existing databases.

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Properties

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userId: int

Tells the user id of whom this database belongs to.

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busy: bool

Tells if the class is busy in waiting/setting for a change.

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Functions

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Get(string keyname)

Returns the value of key. An example: 
local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    if DataStore ~= nil then
        local PlayerCoins = DataStore.Get("Coins")
        if PlayerCoins ~= nil then
            printl("Loaded for player with id: " .. user_id .. "! Player has " .. PlayerCoins .. " coins!")
            OnLoadedCoins(PlayerCoins)
        else
            printl("Making player coins!")
            DataStore.Set("Coins", 10)
            while DataStore.busy do
                wait() -- waiting till the datastore is not done with processing
            end
            OnLoadedCoins(10)
        end
    else
        DataStoreService:CreateDataStore(user_id) -- once it is done creating data store, it will again call the OnDataStoreLoad signal
    end
end

function OnLoadedCoins(coinAmount) 
    printl(coinAmount)
end

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Set(string keyname, value)

Sets a value of a key. This function will create a key if doesnt exist and overwrite if exists.An Example: 
local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    if DataStore ~= nil then
        local PlayerCoins = DataStore.Get("Coins")
        if PlayerCoins ~= nil then 
            printl("Loaded for player with id: " .. user_id .. "! Player has " .. PlayerCoins .. " coins!")
            OnLoadedCoins(PlayerCoins)
        else
            printl("Making player coins!")
            DataStore.Set("Coins", 10)
            while DataStore.busy do
                wait() -- waiting till the datastore is not done with processing
            end
            OnLoadedCoins(10)
        end
    else
        DataStoreService:CreateDataStore(user_id) -- once it is done creating data store, it will again call the OnDataStoreLoad signal
    end
end

function OnLoadedCoins(coinAmount) 
    printl(coinAmount)
end

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Remove(string key)

The key needs to be the valuename. An example: 
local DataStoreService = Game:GetService("DataStoreService")
local Players = Game:GetService("Players")
DataStoreService:Connect("OnDataStoreLoad", __SCRIPT__, "CallOnDataStoreLoad")
Players:Connect("OnPlayerEntered", __SCRIPT__, "OnPlayerEnter")

function OnPlayerEntered(Player)
    DataStoreService:GetDataStore(Player.userId)
end

function CallOnDataStoreLoad(DataStore, user_id)
    if DataStore ~= nil then
        local PlayerCoins = DataStore.Get("Coins")
        if PlayerCoins ~= nil then
            DataStore.Remove("Coins")
            while DataStore.busy do
                wait() -- waiting till the datastore is not done with processing
            end
            printl("Removed!")
        end
    end
end

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Signals

None for now.