急如何把JSP页面中的下拉列表框与数据库相绑定

<script type="text/javascript" src="js/jquery-1.4.2.js"></script>     <script type="text/javascript">         $('document').ready(function(){                           //取得学校放入下拉框            $.ajax({                   type: "post",                   url: "GetAllSchoolServlet",                   dataType: "String",                   success: function (data) {                       var obj = eval('(' + data + ')');                       for (var i=0;i<obj.length;i++){                               var scode = obj[i].scode;                               var sname = obj[i].sname;                                var opt = '<option value="'+scode+'"selected>'+sname+'</option>';                               $('#selSchool').append(opt);                       }                   },                   error: function (XMLHttpRequest, textStatus, errorThrown) {                       alert("ajax取学校信息出错-"+errorThrown);                   }            });      });</script>