如何使用CodeIgniter检查数据库中是否已存在电子邮件 - How to check if email already exists in db with CodeIgniter

How to check if email already exists in db with CodeIgniter

我正在CodeIgniter中做应用程序。我不知道如何将电子邮件与CodeIgniter中的db进行比较，请任何人帮助我。

控制器

public function signup()
{
    $this->load->view('signup');
}
public function savedata(){
$this->load->library('form_validation');        
$this->form_validation->set_rules('firstname', 'firstname', 'required'); 
$this->form_validation->set_rules('lastname', 'lastname', 'required'); 

if ($this->form_validation->run() == TRUE) // Only add new option if it is unique
{       
    $result = $this->account_model->insert();
    if($result > 0)
    {
    $data['message'] = "Added successfully";    
    $this->load->view('signup',$data);
    }
    else
    {
    $this->index(); 
    }
}
else
{
    $this->load->view('signup');
}
}

如何检查电子邮件是否已经存在？

假设你有user表和email列。因此，您必须在表单验证中添加此行

$this->form_validation->set_rules('email','Email','required|valid_email|is_unique[users.email]');

注意并且需要在email列中具有唯一的索引

检查文档

添加规则：

$this->form_validation->set_rules('email', 'Email', 'callback_rolekey_exists');

在同一控制器中：

function rolekey_exists($key) {
  $this->roles_model->mail_exists($key);
}

在模型中，

function mail_exists($key)
{
    $this->db->where('email',$key);
    $query = $this->db->get('users');
    if ($query->num_rows() > 0){
        return true;
    }
    else{
        return false;
    }
}

参考

最佳方式

$this->form_validation->set_rules(
            'email', 'Email', 'valid_email|required|is_unique[usr_user.user_email]',
            array('is_unique' => 'This %s already exists.')
        );

 //in controller    
public function usernameExist($username)
{
    $user = $this->Model-> usernameExist($username);
    if ($user) {
        $this->form_validation->set_message(
            'usernameExist',
            'Username  is already exist.'
        );
        return false;
    } else {
        return true;
    }
}

function username_Exist($key)
{
    $this->db->where('username', $key);
    $query = $this->db->get('signup');
    if ($query->num_rows() > 0) {
        return true;
    } else {
        return false;
    }
}

在模型中输入这个

 $this->form_validation->set_rules('username', 'User', 'trim|required|callback_username_Exist');
        //type in controller in form validation