如何使用MySQL和Ruby实现一个简单的时钟功能

CREATE TABLE IF NOT EXISTS `clocks` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(255),
  `time` DATETIME
);

require 'mysql2'

# 连接数据库
client = Mysql2::Client.new(
  host: 'localhost',
  username: 'root',
  passWord: 'password',
  database: 'your_database_name'
)

# 添加新的时钟
def add_clock(client, name)
  current_time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
  client.query("INSERT INTO clocks (name, time) VALUES ('#{name}', '#{current_time}')")
  puts "时钟 #{name} 添加成功！"
end

# 更新时钟时间
def update_clock(client, name)
  current_time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
  client.query("UPDATE clocks SET time = '#{current_time}' WHERE name = '#{name}'")
  puts "时钟 #{name} 更新成功！"
end

# 查询时钟
def get_clock(client, name)
  result = client.query("SELECT * FROM clocks WHERE name = '#{name}'")
  if result.count > 0
    clock = result.first
    puts "时钟 #{clock['name']} 的当前时间为：#{clock['time']}"
  else
    puts "找不到名称为 #{name} 的时钟！"
  end
end

# 控制台应用程序示例
while true
  puts "请选择操作：(1) 添加时钟 (2) 更新时钟 (3) 查询时钟 (4) 退出"
  choice = gets.chomp.to_i
  case choice
  when 1
    puts "请输入时钟名称："
    name = gets.chomp
    add_clock(client, name)
  when 2
    puts "请输入要更新的时钟名称："
    name = gets.chomp
    update_clock(client, name)
  when 3
    puts "请输入要查询的时钟名称："
    name = gets.chomp
    get_clock(client, name)
  when 4
    break
  else
    puts "无效的选择！"
  end
end

# 关闭数据库连接
client.close