如何从codeigniter中的db检索数据

Question

   function send_admin_email($from = $email_id, $to, $subject, $body, $to_user = NULL, $attachment = NULL, $Bcc = NULL,$cc=NULL){
    $email_id = $this->db->select('value')
            ->get_where('common_email_settings', array('id' => 2))
            ->row()
            ->value;
             print_r($email_id);
    
    if($from == ""){
        $from = "*Greetings@investorsloanservicing.com*";
        $name = "Sharestates";
    }elseif($from == "*LoanServicing@investorsloanservicing.com*"){
        $name = "Sharestates LoanServicing";
    }elseif($from == "processing@investorsloanservicing.com"){
        $name = "Sharestates";
    }else{
        $name = "Sharestates";
    }

我在我的代码 codeigniter 中硬编码了这些电子邮件，我想将其更改为从数据库中获取而不是硬编码的电子邮件。我该怎么做？我做了一个从数据库中获取数据的函数，

        public function getemailData(){
                $email_id = $this->db->select('value')
                ->get_where('common_email_settings', array('id' => 2))
                ->row()
                ->value;
                 print_r($email_id);
        }

现在遇到的问题是，每当收到不同的电子邮件时，我都无法从 db 中获取它。我应该怎么做？我的数据库名称是 common_email_settings，其中包含 id、name、value 等字段

数据库 database