php+mysql有数据，但查询不到数据有关问题

$query = "select name,class,schoolid from studentslist where class like '$query_class' and name like '$query_name' ";<br />			<br />			echo $query.'<br>';<br />                        <br />			$result = MySql_query($query, $id);<br /><br />//			if($result)echo 'query success';<br /><br />                        $totalnum = MySql_num_rows($result);<br />echo $totalnum.' records found.';<br />                        if ($totalnum < 1) {<br />                            echo "<p align=left>未找到 " . $query_class . " 班姓名为 " . $query_name . " 的学生记录。</p>";<br />                        }