在Java语言中从ResultSet中检索聚合的SQL值

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 执行查询语句
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM mytable");

            // 检索聚合的SQL值
            if (rs.next()) {
                int count = rs.getInt(1);
                System.out.println("总记录数：" + count);
            }

            // 关闭连接
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}