esx_core/server/classes/datastore.lua

function CreateDataStore(name, owner, data)

	local self = {}

	self.name  = name
	self.owner = owner
	self.data  = data

	local timeoutCallbacks = {}

	self.set = function(key, val)
		data[key] = val
		self.save()
	end

	self.get = function(key)
		return data[key]
	end

	self.save = function()

		for i=1, #timeoutCallbacks, 1 do
			ESX.ClearTimeout(timeoutCallbacks[i])
			timeoutCallbacks[i] = nil
		end

		local timeoutCallback = ESX.SetTimeout(10000, function()

			if self.owner == nil then
				MySQL.Async.execute(
					'UPDATE datastore_data SET data = @data WHERE name = @name',
					{
						['@data'] = json.encode(self.data),
						['@name'] = self.name,
					}
				)
			else
				MySQL.Async.execute(
					'UPDATE datastore_data SET data = @data WHERE name = @name and owner = @owner',
					{
						['@data']  = json.encode(self.data),
						['@name']  = self.name,
						['@owner'] = self.owner,
					}
				)
			end

		end)

		table.insert(timeoutCallbacks, timeoutCallback)

	end

	return self

end