esx_core-esx-framework/server/main.lua

local IdentifierTables = {}

function GetTables()
	MySQL.ready(function ()
		MySQL.Async.fetchAll('SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME = @id AND TABLE_SCHEMA = @db', { ['@id'] = "owner", ["@db"] = Config.databaseName}, function(result)
			if result then
			--print(json.encode(result))
 				for k, v in pairs(result) do
					table.insert( IdentifierTables, {table = v.TABLE_NAME, column = "owner"})
				end
			end
		end)
		MySQL.Async.fetchAll('SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME = @id AND TABLE_SCHEMA = @db', { ['@id'] = "identifier", ["@db"] = Config.databaseName}, function(result)
			if result then
				--print(json.encode(result))
		   		for k, v in pairs(result) do
		 			table.insert( IdentifierTables, {table = v.TABLE_NAME, column = "identifier"})
		   		end
			end
		end)
	end)
end

GetTables()

RegisterServerEvent("kashactersS:SetupCharacters")
AddEventHandler('kashactersS:SetupCharacters', function()
	local src = source
	local Characters = GetPlayerCharacters(src)
	TriggerClientEvent('kashactersC:SetupUI', src, Characters)
end)

RegisterServerEvent("kashactersS:CharacterChosen")
AddEventHandler('kashactersS:CharacterChosen', function(charid, ischar)
	local src = source
	local isNew = true
	if ischar then isNew = false end
	local spawn = {}
	if type(charid) == "number" and string.len(charid) == 1 and type(ischar) == "boolean" then
		TriggerEvent('esx:onPlayerJoined', src, charid, isNew)
	else
		-- Trigger Ban Event here to ban individuals trying to use SQL Injections
	end
end)

RegisterServerEvent("kashactersS:DeleteCharacter")
AddEventHandler('kashactersS:DeleteCharacter', function(charid)
	local src = source
	if type(charid) == "number" and string.len(charid) == 1 then
		DeleteCharacter(ESX.GetIdentifier(src), charid)
		TriggerClientEvent("kashactersC:ReloadCharacters", src)
	else
		-- Trigger Ban Event here to ban individuals trying to use SQL Injections
	end
end)

function GetPlayerCharacters(source)
	local Chars = MySQLAsyncExecute("SELECT * FROM `users` WHERE `identifier` LIKE 'char%:"..ESX.GetIdentifier(source).."'")
	for i = 1, #Chars, 1 do
		charJob = MySQLAsyncExecute("SELECT * FROM `jobs` WHERE `name` = '"..Chars[i].job.."'")
		charJobgrade = MySQLAsyncExecute("SELECT * FROM `job_grades` WHERE `grade` = '"..Chars[i].job_grade.."' AND `job_name` = '"..Chars[i].job.."'")
		local accounts = json.decode(Chars[i].accounts)
		Chars[i].bank = accounts["bank"]
		Chars[i].money = accounts["money"]
		Chars[i].job = charJob[1].label
		if charJob[1].label == "Unemployed" then
			Chars[i].job_grade = ""
		else
			Chars[i].job_grade = charJobgrade[1].label	
		end
		if Chars[i].sex == "m" then
			Chars[i].sex = "Male"
		else
			Chars[i].sex = "Female"	
		end
	end
	return Chars
end

function DeleteCharacter(identifier, charid)
	local identifier = 'char'..charid..':'..identifier
	for _, itable in pairs(IdentifierTables) do
		MySQLAsyncExecute("DELETE FROM `"..itable.table.."` WHERE `"..itable.column.."` = '"..identifier.."'")
	end
end

function MySQLAsyncExecute(query)
	local IsBusy = true
	local result = nil
	MySQL.Async.fetchAll(query, {}, function(data)
		result = data
		IsBusy = false
	end)
	while IsBusy do
		Citizen.Wait(0)
	end
	return result
end