JSP database access application code

Question

Does anyone know of existing sample code, that can be downloaded, for the above that can do the following:
1. User login
2. Data retrieval from database
3. Data submission by fill in form
Any help appreciated?
Rupert

Answer 1

Here's an ad-hoc example:
<%
final String PREPARED_STATEMENT = "SELECT * FROM userTable WHERE userid = ? AND userpwd = ?";
String name = "", pwd = "", errorMsg = "",
loginsubmitted = request.getParameter("loginsubmitted"),
intendedPath = request.getParameter("intendedPath");
//If the intendedPath was never set then set it to your 1st protected page...
if(null == intendedPath)
   intendedPath = "your/protected/Page.jsp";
if(null != loginsubmitted && "true".equals(loginsubmitted))
   name = request.getParameter("name");
   pwd = request.getParameter("pwd");
   //Code to be abstracted into a servlet of some sort...
   java.sql.Connection con = dataSource.getConnection(); //Assume dataSource has been initialized elsewhere
   java.sql.PreparedStatement stmnt = con.prepareStatement(PREPARE_STATEMENT);
   stmnt.setString(1,name);
   stmnt.setString(2,pwd);
   java.sql.ResultSet rs = stmnt.executeQuery();
   rs.next();
   if(rs.isAfterLast())
      errorMsg = "Invalid user ID or password.";
   else
      request.getRequestDispatcher(intendedPath).forward(request,respone);
%>
<h1>Login</h1>
<form name="login" action="thispage.jsp" method="POST">
   Name: <input type="text" name="name" value="<%=name%>"/>
   Password: <input type="password" name="pwd" value="<%=pwd%>"/>
   <input type="hidden" name="loginsubmitted" value="true"/>
   <input type="hidden" name="intendedPath" value="<%=intendedPath%>"/>
   <input type="submit"/>
   <hr/>
   <h3><%=errorMsg%></h3>
</form>Cliff