Mybatis的配置与实现

//使用jdbc访问数据库
public class Demo{
    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        //1.注册驱动
        DriverManager.registerDriver(new Driver());
        Class.forName("com.mysql.jdbc.Driver");
        
        //2.创建连接 三种方式
        //url是数据库的路径
        //Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/db2", "root", "123");
        //Properties properties = new Properties();
        //properties.setProperty("user", "root");
        //properties.setProperty("password", "123");
        //Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/db2", properties);
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/db2?user=root&password=123");
        //3.创建小车,并关联sql语句
        Statement statement = connection.createStatement(); 
        //3.1关联sql语句
         /*String sql = "select * from student1";
         //执行executerQuary方法,实现到数据库获取数据并存储到ResultSet对象里
         ResultSet set = statement.executeQuery(sql);//只适合查;增删改使用executeUpdate,增删改不用箱子
        //4.卸货(ResultSet)
        while    (set.next()) {//执行一次,取一条记录出来
            //Object object = set.getObject(2);
            Object object = set.getObject("name");
            System.out.println(object);
        }*/
        String sql = "select * from user";
        //返回的值到ResultSet中
        ResultSet rSet = statement.executeUpdate(sql);
        while(rSet.next()){
                       Object object = rSet.getObject("name");//此处只取名字
                }
            //5.关闭资源
        rSet.close();
        statement.close();
        connection.close();
    }    
}