This is the first time that I have completed a program which is about database---MySql Server .I hava spent the whole afternoon studying Servlet that is related to mysql. Now that my specialized field is Software-Engineering , so I must devote myself to my field . However , it's a pity that when we study in university , we can obtain only a little konwledge from the school . Therefore , we must learn know how to learn by ourselves . When I finished the program , I began to debug . But I failed the first time . And I didn't know how to solve it . Great effort later , by kinds of methods , the problem was settled . To my excitement , it is only some syntax mistakes . I got to understand it that as a programmer I must be more careful !