如何在同一模型中使用另一種方法中的模型中的一種方法使用insert_id

Question

我遇到了insert_id問題。我使用的是CodeIgniter。我有一種方法，其中我插入一些值，並在其中我返回

$insert_id=$this->db->insert_id(); 
return $insert_id;` 

我想在同一模型中的另一種方法中使用此值。我試過了：$insert_id=$this->add_teacher_subject();但以這種方式，第一個方法再次運行，我沒有收到last_insert_id，但是這個值爲+1。請告訴我，我怎麼能解決這個問題？

我的模式是：

public function add_teacher_subject() { 

     $date = new DateTime("now"); 
     $data=array(
      'teacher_id'=>$this->input->post('teacher'), 

      'user_id'=>$this->session->userdata['user_id'], 

      'created_at'=>$date->format('Y-m-d H:i:s') 

     ); 

     $this->db->insert('student_surveys',$data); 
     $insert_id=$this->db->insert_id(); 
     return $insert_id; 

    } 
    public function survey_fill() 
    { 
      $insert_id=$this->add_teacher_subject(); 
     if ($this->input->post('answer')) { 
      $answers= $this->input->post('answer');   
      if (null !==($this->input->post('submit'))) { 
       $date = new DateTime("now"); 
       foreach($answers as $question_id=>$answer) 
       { 
        $data = array(
         'user_id'=>$this->session->userdata['user_id'], 
         'question_id'=>$question_id, 
         'answer'=>$answer,    

         'student_survey_id' => $insert_id 
        ); 

        $this->db->insert('survey_answers', $data); 

       } 

      } 

Answer 1

您可以使用會話[]保持最後插入ID：

public function add_teacher_subject() { 
    $date = new DateTime("now"); 
    $data = array(
     'teacher_id' => $this->input->post('teacher'), 
     'user_id' => $this->session->userdata['user_id'], 
     'created_at' => $date->format('Y-m-d H:i:s') 
    ); 

    $this->db->insert('student_surveys', $data); 
    $insert_id = $this->db->insert_id(); 
    $newdata = array('insert_id' => $insert_id); 
    $this->session->set_userdata($newdata); 
    return $insert_id; 
} 

public function survey_fill() { 
    $insert_id = $this->session->userdata('insert_id'); 
    if ($this->input->post('answer')) { 
     $answers = $this->input->post('answer'); 
     if (null !== ($this->input->post('submit'))) { 
      $date = new DateTime("now"); 
      foreach ($answers as $question_id => $answer) { 
       $data = array(
        'user_id' => $this->session->userdata['user_id'], 
        'question_id' => $question_id, 
        'answer' => $answer, 
        'student_survey_id' => $insert_id 
       ); 

       $this->db->insert('survey_answers', $data); 
      } 
     } 
    } 
}