Metin2 lua query

function query(sql)
	user = "mt2"
	pw = "mt2!@#"
	local var = {}
	var.pre = ''
	if user ~= nil then
	var.pre = var.pre..' -u'..user
	end
	if pw ~= nil then
	var.pre = var.pre..' -p'..pw
	end
	var.scriptfile = 'sc_'..pc.get_name()..number(1,999)..number(2,999)..number(3,999)
	var.outputfile = 'op_'..pc.get_name()..number(1,999)..number(2,999)..number(3,999)
	sql = string.gsub(sql,'"',"'")
	var.str = "/usr/local/bin/mysql -N -L "..var.pre.." < "..var.scriptfile.." > "..var.outputfile
	script = io.open(var.scriptfile,"a+")
	script:write(sql)
	script:close()
	os.execute(var.str)
	back = io.open(var.outputfile)
	quer = back:read()
	back:flush()
	back:close()
	os.remove(var.scriptfile)
	os.remove(var.outputfile)
	return quer
end