在java中批量选择和迭代mysql结果，以减少等待时间。

import java.sql.*;

public class MySQLBatchSelectAndIterateExample {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            // 连接到MySQL数据库
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 创建Statement对象
            statement = connection.createStatement();

            // 执行批量选择
            statement.addBatch("SELECT * FROM mytable1");
            statement.addBatch("SELECT * FROM mytable2");
            statement.addBatch("SELECT * FROM mytable3");
            statement.executeBatch();

            // 获取结果集
            resultSet = statement.getResultSet();

            // 迭代结果集
            while (resultSet.next()) {
                // 处理每条记录
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                // 其他字段...

                // 输出记录信息
                System.out.println("ID: " + id + ", Name: " + name);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (resultSet != null) {
                    resultSet.close();
                }
                if (statement != null) {
                    statement.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}