PDO - 選擇列從POST /參數

Question

未來是否有可能有這樣的功能：

function getProjectData($uid, $what) { 
    $sql = "SELECT ? FROM projects WHERE fid = ?"; 
    $stmt = $this->db->prepare($sql); 
    $stmt->execute(array($uid,$what); 
    return $stmt->fetch(PDO::FETCH_LAZY); 
} 

「UID」是用戶ID和「什麼」是我想例如列「標題」所以查詢將是：

SELECT title FROM projects WHERE fid = 1 

這可能嗎？

Answer 1

表和列名不能在PDO來代替：

到這裏看看： Can PHP PDO Statements accept the table or column name as parameter?

Answer 2

function getProjectData($uid) { 
    $sql = "SELECT * FROM projects WHERE fid = ?"; 
    $stmt = $this->db->prepare($sql); 
    $stmt->execute(array($uid); 
    return $stmt->fetch(); 
} 

這樣調用它

$proj_data = getProjectData($uid); 

，然後得到所需的性能

$title = $proj_data[$what];