在同一网页中从mysql数据库发送数据和接收数据

I am trying to make a discussion board as my own project, right now I have a page where a user enter his comment, and another page where it confirms that his comment was posted, and then a third page where you could see all the comments. All this is done using php and mysql as the database that holds all the users information such as the users, name, comments, date ,etc.I am trying to make a discussion board as my ow