php - 如何批量删除问题

Question

假设我手里有 30 个问题。 我想一次删除这30个问题。 但有一些编码错误，如果您能帮助我，我将不胜感激

public function Clear()
    {
        $stmt = $this->db->prepare("SELECT id FROM ask_data WHERE standart=0");
        $stmt->execute();

        if ($stmt->rowCount() > 0)
        {
            $ask_cnt = $stmt->rowCount();

            $ask_data = array();

            while ($row = $stmt->fetch())
            {
                $data = array("ask_id" => $row['id']);
                $stmt2 = $this->db->prepare("DELETE FROM  id FROM questions WHERE ask_id=(:ask_id)");
                $stmt->bindParam(':ask_id', $ask_data[$i], PDO::PARAM_INT);
                $stmt2->execute();  
            }
            $i = 0;
            $count = count($ask_id);

            for ($i=0;$i<$count;$i++)
            {
                $data = array("ask_id" => $row['id']);
                $stmt2 = $this->db->prepare("DELETE FROM  id FROM questions WHERE ask_id=(:ask_id)");
                $stmt->bindParam(':ask_id', $ask_data[$i], PDO::PARAM_INT);
                $stmt2->execute();
            }
        }
    }

Answer 1

delete 语句是错误的 - 您有两个 from 子句。您应该删除FROM id:

DELETE FROM questions WHERE ask_id=(:ask_id)

话虽如此，您可以通过使用 IN 运算符而不是单独的查询来极大地简化您的程序:

DELETE FROM questions
WHERE ask_id IN (SELECT id 
                 FROM   ask_data
                 WHERE  standart = 0)