如何验证Codeigniter中的电子邮件重复条目

Question

我需要帮助来验证电子邮件，请教我如何。

插入现有电子邮件后出现

数据库错误：
图像：

添加用户的创建代码

function student($param1 = '', $param2 = '', $param3 = '')
{
    if ($this->session->userdata('admin_login') != 1)
        redirect('login', 'refresh');
    if ($param1 == 'create') {
        $data['name']        = $this->input->post('name');
        $data['mname']       = $this->input->post('mname');
        $data['lastname']    = $this->input->post('lastname');
        $data['birthday']    = $this->input->post('birthday');
        $data['sex']         = $this->input->post('sex');
        $data['address']     = $this->input->post('address');
        $data['phone']       = $this->input->post('phone');
        $data['email']       = $this->input->post('email');
        $data['password']    = md5($this->input->post('password')); 
        $data['father_name'] = $this->input->post('father_name');
        $data['mother_name'] = $this->input->post('mother_name');
        $data['class_id']    = $this->input->post('class_id');
        $data['roll']        = $this->input->post('roll');
        $this->db->insert('student', $data);
        $student_id = mysql_insert_id();
        move_uploaded_file($_FILES['userfile']['tmp_name'], 'uploads/student_image/' . $student_id . '.jpg');
        $this->email_model->account_opening_email('student', $data['email']); //SEND EMAIL ACCOUNT OPENING EMAIL
        $this->session->set_flashdata('flash_message', get_phrase('add_student_success'));
        redirect(base_url() . 'index.php?admin/student/' . $data['class_id'], 'refresh');
    }

Answer 1

定义表单时，请为is_unique

添加验证程序

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