PDO和bindParam問題

Question

好了，這裏是我的代碼...

public function insert_cover($title, $description, $category_id, $filename) 
{ 
    if($this->category_exists($category_id)) { 
     $sth = $this->con->prepare(' 
      INSERT INTO cover 
      (id, title, description, image, category_id, timestamp) 
      VALUES 
      (null, :title, :description, :image, :category_id, null) 
     '); 

     $sth->bindParam(':title', $title, PDO::PARAM_STR); 
     $sth->bindParam(':description', $description, PDO::PARAM_STR); 
     $sth->bindParam(':image', $filename); 
     $sth->bindParam('::category_id', $category_id, PDO::PARAM_INT); 

     $sth->execute(); 

     return true; 
    } else { 
     return false; 
    } 
} 

這裏是我的錯誤：

Warning: PDOStatement::execute() [pdostatement.execute]: SQLSTATE[HY093]: Invalid parameter number: parameter was not defined in /MAMP/htdocs/*****/lib/DB.class.php on line 44 

，如果我不使用bindParam並添加工作正常數組鍵=>值對​​

任何想法這裏發生了什麼？

Answer 1

大概在$sth->bindParam('::category_id', $category_id, PDO::PARAM_INT); 糾正一個錯字：$sth->bindParam(':category_id', $category_id, PDO::PARAM_INT);

Answer 2

你有兩個冒號爲category_id。