大家帮忙看看这oracle代码错在哪里?
public ArrayList<Product> hclassselect(int currpage,int count)
{
ArrayList<Product> list=new ArrayList<Product>();
Connection conn=BaseDao.getConn();
PreparedStatement ps=null;
ResultSet rs=null;
Product p=null;
try {
ps = conn.prepareStatement("select * from (select epc_name,epc_class_id,et_type,et_id"+
"from (select a.epc_name,a.epc_id,b.* from easybuy_pclass a,easybuy_ptype b" +
" where a.epc_class_id=b.epc_class_id order by b.et_id))" +
"where et_id between"+((currpage-1)*count+1)+"and"+currpage*count);
rs = ps.executeQuery();
while(rs.next())
{
p=new Product();
p.setFid(rs.getInt("epc_class_id"));
p.setFname(rs.getString("epc_name"));
p.setSid(rs.getInt("et_id"));
p.setSname(rs.getString("et_name"));
list.add(p);
}

} catch (Exception e) {
e.printStackTrace();
}
finally
{
BaseDao.closeAll(rs, ps, conn);
}
return list;
}

rs总是为null怎么搞的
[解决办法]
是不是报异常了，还有你拼的语句是不是少了空格了，造成异常了
[解决办法]

 "where et_id between"+((currpage-1)*count+1)+"and"+currpage*count);