php - $this->db->insert_id() 似乎抹去了我以前的 insert_id 变量值

Question

代码如下:

$the_question = $_POST['question'];
            $the_answer = $_POST['answer'];
            $dummy_num[] = $_POST['dummy_answer_1'];
            $dummy_num[] = $_POST['dummy_answer_2'];
            $dummy_num[] = $_POST['dummy_answer_3'];
            //Get Hidden Test ID and Q_order
            $test_id = $_POST['test_id'];
            $q_order = $_POST['q_order'];
            //Submit Question
            $data_submit_q = array (
                'type' => 1,
                'question' => $the_question,
                'done' => 1
            );
            $this->db->where('test_id', $test_id);
            $this->db->where('q_order', $q_order);
            $this->db->update('questions', $data_submit_q);
            $question_id = $this->db->insert_id();
            $time_created = date('Y-m-d H:i:s');
            //Submit Answer 
            $data_submit_a = array (
                'test_id' => $test_id,
                'question_id' => $question_id,
                'option' => $the_answer,
                'company_id' => $data['company']->id,
                'job_id' => $data['session_job_id'],
                'time_created' => $time_created
            );
            $this->db->insert('options', $data_submit_a);
            $answer_id = $this->db->insert_id();

            //Let question know that answer is right.
            $data_submit_qr = array (
                'answer_id' => $answer_id
            );

            $this->db->where('id', $question_id);
            $this->db->where('test_id', $test_id);
            $this->db->update('questions', $data_submit_qr);

设置答案 ID 会删除问题 ID 的值，然后在更新数据库时答案 ID 也没有值。即使它之前确实如此。

Answer 1

$this->db->insert_id() 方法在执行数据库插入(顾名思义)时检索 ID。

您在更新后使用它，这就是您的 $question_id 出现问题的原因(我认为它会被设置为 FALSE，但我不确定该方法在什么时候返回什么在错误的上下文中调用)。当您进行最后一次更新时，您将其用作 WHERE 条件，如果未设置...

并不是你对 insert_id() 的第二次调用消除了第一个，我怀疑更像是第一个已经 NOT SET(或 FALSE)