mysql与redis结合使用

<!-- MySQL -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.23</version>
</dependency>

<!-- Redis -->
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.7.0</version>
</dependency>

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MySQLConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/mydatabase";
    private static final String USER = "user";
    private static final String PASSWORD = "password";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USER, PASSWORD);
    }
}

import redis.clients.jedis.Jedis;

public class RedisConnection {
    private static final String HOST = "localhost";
    private static final int PORT = 6379;

    public static Jedis getJedis() {
        return new Jedis(HOST, PORT);
    }
}

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import redis.clients.jedis.Jedis;

public class Main {
    public static void main(String[] args) {
        try (Connection conn = MySQLConnection.getConnection();
             Statement stmt = conn.createStatement();
             Jedis jedis = RedisConnection.getJedis()) {

            // 查询MySQL数据
            ResultSet rs = stmt.executeQuery("SELECT * FROM users WHERE id = 1");
            if (rs.next()) {
                String username = rs.getString("username");

                // 缓存到Redis
                jedis.set("user:1:username", username);
            }

            // 从Redis读取缓存数据
            String cachedUsername = jedis.get("user:1:username");
            System.out.println("Cached Username: " + cachedUsername);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}