Wenn E-Mail bereits vorhanden ist, gebe keine Daten in die Tabelle ein und gebe eine Eingabe (Bereits vorhanden!)

Question

Ich hatte ein Newsletter-Formular in PHP, das die E-Mail entweder bereits in der Datenbanktabelle oder nicht vorhanden einfügt, aber ich möchte, wenn E-Mail bereits existiert Es wird kein doppelter Eintrag in der Datenbanktabelle und der Eingabeaufforderung ("Already exist") hinzugefügt. fix freundlicherweise meinen Code unten:

<?php 
defined('BASEPATH') OR exit('No direct script access allowed'); 

class Newsletter extends CI_Controller { 

    function __construct() 
    { 
     parent::__construct(); 
     $this->load->model('stories_model'); 
    } 
    public function index() 
    { 
     $this->load->view('header'); 
     $this->load->view('navigation'); 
     $this->load->view('pages/newsletter'); 
     $this->load->view('footer'); 
    } 
    public function register() 
    { 
     $email = $this->input->post('email'); 

     $arr['result'] = 'confirm'; 
     $arr['message'] = '<ul>'; 


     if (strlen($email) == 0) { 
      $arr['result'] = 'error'; 
      $arr['message'] .= '<li>Please fill the email.</li>'; 
     } 

     if ($arr['result'] != 'error') 
     { 
      $insertcomment=$this->db->insert('newsletter_subscribers',array('email'=>$email)); 

      $arr['result'] = 'confirm'; 
      $arr['message'] = 'Successfull Added.'; 
     } 
     echo json_encode($arr); 
    } 
    public function cronjob() 
    { 
     $data['stories'] = $this->newsletter_model->get_stories($email); 
     $data['emails'] = $this->newsletter_model->get_emails_subscribers(); 
    } 

} 

Answer 1

Sie get_where

 if ($arr['result'] != 'error') 
     { 
      if(!$this->db->get_where('newsletter_subscribers', array('email' => $email), 0, 0)) { 
      $insertcomment=$this->db->insert('newsletter_subscribers',array('email'=>$email)); 

      $arr['result'] = 'confirm'; 
      $arr['message'] = 'Successful Added.'; 

      } else { 

      $arr['result'] = 'error'; 
      $arr['message'] = 'Already Added.'; 

      } 

     } 

Answer 2

<?php 
defined('BASEPATH') OR exit('No direct script access allowed'); 

class Newsletter extends CI_Controller { 

    function __construct() 
    { 
     parent::__construct(); 
     $this->load->model('stories_model'); 
    } 
    public function index() 
    { 
     $this->load->view('header'); 
     $this->load->view('navigation'); 
     $this->load->view('pages/newsletter'); 
     $this->load->view('footer'); 
    } 
    public function register() 
    { 
     $email = $this->input->post('email'); 

     $arr['result'] = 'confirm'; 
     $arr['message'] = '<ul>'; 


     if (strlen($email) == 0) { 
      $arr['result'] = 'error'; 
      $arr['message'] .= '<li>Please fill the email.</li>'; 
     } 

     if ($arr['result'] != 'error') 
     { 
      $getEmails = $this->db->get_where('newsletter_subscribers', array('email' => $email) 
      $countEmails = $getEmails->num_rows(); 
      if($countEmails < 1) 
      { 
       $insertcomment=$this->db->insert('newsletter_subscribers',array('email'=>$email)); 
       $arr['result'] = 'confirm'; 
       $arr['message'] = 'Successfull Added.'; 
      } 
      else 
      { 
       $arr['result'] = 'error'; 
       $arr['message'] = 'Email Already Exist.'; 
      } 

     } 
     echo json_encode($arr); 
    } 
    public function cronjob() 
    { 
     $data['stories'] = $this->newsletter_model->get_stories($email); 
     $data['emails'] = $this->newsletter_model->get_emails_subscribers(); 
    } 

}