java连接数据库搜索的一些问题

String aname = request.getParameter("aname");
        if(aname != null && !aname.trim().equals("")){
            try{
                String sql = "select * from article where aname like '%" + aname + "%'";
System.out.println(sql);
                conn = DB.getConn();
                stmt = DB.createStmt(conn);
                rs = DB.executeQuery(stmt, sql);
                while(rs.next()){
                    Article a = new Article();
                    a.initFromRs(rs);
                    articles.add(a);
                }
            } catch(SQLException e){
                e.printStackTrace();
            }
        }

如果aname填写其他字母搜索没有问题，但是如果填t就搜不出任何东西，求解！