警告：mysql_fetch_array（）：提供的参数不是有效的MySQL结果

尝试运行此命令时出现错误：

query('SELECT title,content FROM staff_vacancies ORDER BY ordering LIMIT 0,100'); // Get an array containing the results. // Loop for each item in that array while ($row = $connector->fetchArray($result)){ echo $row['title'].''; echo $row['content']; } ?> 我有一个链接文件：DbConnector.php： link = mysql_connect($host, $user, $pass); mysql_select_db($db); register_shutdown_function(array(&$this, 'close')); } //*** Function: query, Purpose: Execute a database query *** function query($query) { $this->theQuery = $query; return mysql_query($query, $this->link); } //*** Function: getQuery, Purpose: Returns the last database query, for debugging *** function getQuery() { return $this->theQuery; } //*** Function: getNumRows, Purpose: Return row count, MySQL version *** function getNumRows($result) { return mysql_num_rows($result); } //*** Function: fetchArray, Purpose: Get array of query results *** function fetchArray($result) { return mysql_fetch_array($result); } //*** Function: close, Purpose: Close the connection *** function close() { mysql_close($this->link); } } ?> 有人知道问题出在哪里吗？