store data with redis

redis.rb

require 'redis'

redis = Redis.new
names = []


keys = redis.keys("connect*:*")
if !keys.empty?
  redis.del(*keys)
end

if redis.exists("connect_id")
  redis.del("connect_id")
end

3.times do |i|
  puts "plz input a name: "
  name = gets.chomp()
  puts "input online time: "
  t1 = gets.chomp()
  puts "input offline time: "
  t2 = gets.chomp()

  names << name

  id = redis.incr("connect_id")

  redis.hset("connect:#{id}", "online", t1)
  redis.hset("connect:#{id}", "offline", t2)

  redis.rpush("connects:#{name}", "connect:#{id}")
end

names.uniq.each do |name|
  keys = redis.lrange("connects:#{name}", 0, -1)
  total = 0
  keys.each do |key|
   h = redis.hgetall(key)
   total += h["offline"].to_i - h["online"].to_i
 end
 puts "#{name} total connect time #{total}"
end