用javabean做的数据库连接有时行,有时不行?

Question

2.sign_up_handle.jsp
<%@ page language="java"  import="java.sql.*"  %>
<jsp:useBean id='db' class='mydb.faq' />
<% 
try
{
ResultSet rs=null; String name=request.getParameter("name");
String  n_name=request.getParameter("n_name");
String  password =request.getParameter("password");
String  q_password=request.getParameter("q_password");
String  mail =request.getParameter("mail");
String  birdh =request.getParameter("birth");
String  job=request.getParameter("job");newsql = "insert forum_user(name,password) values('"+name+"',"+"'"+password+"') ";out.println(newsql);
//out.println(newsql);
rs = db.executeQuery(newsql);
rs.close();  
}
catch(Exception e)
{
  out.println(e.toString());
}
%><a href ="login.jsp">登录</a>