Mysql数据库：java对象的存入和查询

public class DataBase{
	public static final String Driver = "com.mysql.jdbc.Driver";
	public static final String url = "jdbc:mysql://localhost:3306/books";
	public static final String user = "root";
	public static final String password = "root";

	static {
		try {
			Class.forName(Driver);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	public static Connection getConnection() throws SQLException{
		Connection conn = null;
		conn = DriverManager.getConnection(url,user,password);
		return conn;
	}
}

class Test{
    public static void main(String[] args) throw Exception{
		ArrayList<String> al = new ArrayLIst<String>();
		al.add("1");
		al.add("2");
		al.add("3");
		//先进行数据的保存
		Connection conn = DataBase.getConnection();
		PreparedStatement pstmt = con.prepareStatement("insert into books values(1,?)");//想数据库中插入第一组数据
		pstmt.setObject(1,al);
		int time = pstmt.executeUpdate();//执行操作
		System.out.println(time+"插入完成");//提示插入完成
		pstmt.close();
		//再进行数据的提出
		Statement stmt = con.createStatement();
		ResultSet rs = stmt.executeQuery("select book from books where id=1");
		if(rs.next()){
			ObjectInputStream oips = new ObjectInputStream(rs.getBinaryStream(1));
			//从rs中得到对象的流,如果直接从rs.getObject(1)得到的对象是无法直接转化为下面的对象的。
			ArrayList<String> obb = (ArrayList<String>)oips.readObject();//从流中读取对象
			System.out.println(obb.get(2));//输出对象中指定的数据
			oips.close();
		}
		rs.close();
		stmt.close();               
		con.close();
    }
}