MySQL--规范数据库设计及数据库连接

package com.model.test;

import java.sql.*;

public class JDBC {
    public static void main(String[] args) throws SQLException {

        Connection connection=null;
        Statement statement=null;
        ResultSet resultSet=null;

        try {
            //1.加载驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.获取用户的信息和url
            String url="jdbc:mysql://localhost:3306/shop";
            String username="root";
            String password="12346";
            //3.获取数据库连接对象Connection
            connection = DriverManager.getConnection(url, username, password);
            //4.获取SQL执行对象Statement
            statement = connection.createStatement();
            //5.获取SQL语句
            String sql="select * from user";
            //6.执行SQL并获取返回值
            resultSet = statement.executeQuery(sql);
            //7.遍历返回值result即可
            while (resultSet.next()){
                String id = (String) resultSet.getObject("id");
                String name = (String) resultSet.getObject(2);
                System.out.println("id号："+id+"姓名："+name);
            }

        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            //8.关闭连接
            resultSet.close();
            statement.close();
            connection.close();
            
        }



    }
}