如何使用jdbc实现一对多

import java.sql.*;

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

        try {
            // 1. 建立数据库连接
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 2. 执行SQL语句
            statement = connection.createStatement();

            // 插入主表数据
            String insertMainTableSql = "INSERT INTO main_table (name) VALUES ('Main Data')";
            statement.executeUpdate(insertMainTableSql, Statement.RETURN_GENERATED_KEYS);

            // 获取插入的主键值
            int mainTableId = -1;
            resultSet = statement.getGeneratedKeys();
            if (resultSet.next()) {
                mainTableId = resultSet.getInt(1);
            }

            // 插入从表数据
            String insertSubTableSql = "INSERT INTO sub_table (main_table_id, data) VALUES (" + mainTableId + ", 'Sub Data')";
            statement.executeUpdate(insertSubTableSql);

            // 3. 查询数据
            String selectSql = "SELECT * FROM main_table JOIN sub_table ON main_table.id = sub_table.main_table_id";
            resultSet = statement.executeQuery(selectSql);

            while (resultSet.next()) {
                int mainTableId = resultSet.getInt("main_table.id");
                String mainTableName = resultSet.getString("main_table.name");
                String subTableData = resultSet.getString("sub_table.data");

                System.out.println("Main Table ID: " + mainTableId);
                System.out.println("Main Table Name: " + mainTableName);
                System.out.println("Sub Table Data: " + subTableData);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 4. 关闭连接
            try {
                if (resultSet != null) {
                    resultSet.close();
                }
                if (statement != null) {
                    statement.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}