ApDBUtils引出

 土方法完成封装

利用最原始的方法进行封装

package com.jh.datasource;

import org.junit.jupiter.api.Test;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

//使用原始的方法解决ResultSet问题，将结果集封装到ArrayList

public class JDBCUtilsDruid_tuidea {

    @Test
    public void testSelect(){

        //1.得到连接
        Connection connection = null;
        //2.组织sql
        String sql = "select * from admin02 where id = ?";
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;

        //创建ArrayList   对象，用来存放admin02
        ArrayList list = new ArrayList<>();

        //3.创建PreparedStatement的对象

        try {
            connection = JDBCUtilsDruid.getConnection();
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setInt(1,1);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()){
                int id = resultSet.getInt("id");
                String username = resultSet.getString("username");
                String password = resultSet.getString("password");
                //得到的resultSet的记录，封装到Admin02中，并放入到ArrayList集合中
                list.add(new Admin02(id,username,password));
            }
            System.out.println("list集合数据:" + list);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            //6.关闭资源
            JDBCUtilsDruid.close(resultSet,preparedStatement,connection);
        }
        //return list;

    }

}