自学者的求助：JSP连接数据库的问题。。

Java code:

<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.sql.*" %>
<%!
private void delete(Connection conn,int id){
Statement stmt=null;
try{
stmt=conn.createStatement();
String sql="delete from article where pid="+id;
stmt.executeUpdate(sql);
stmt.executeUpdate("delete from article where id="+id);}catch(SQLException e){
e.printStackTrace();
}finally{
if(stmt!=null){
stmt.close();
stmt=null;
}
}

}
%>
<%
int id=Integer.parseInt(request.getParameter("id"));
int pid=Integer.parseInt(request.getParameter("pid"));
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;Databasename=bbs;SelectMethod=Cursor","sa","sa");

conn.setAutoCommit(false);

delete(conn,id);
Statement stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery("select count(*) from article where pid="+pid);
rs.next();
int count=rs.getInt(1);
if(count<=0){
stmt.executeUpdate("update article set isleaf=0 wh