Php 如何从不同的表中获取相关记录项

首先，我不知道Codeigniter，尽管我对普通的PHP/MYSQL还行

我正试图从相关记录中获取附加字段[unlock_code]内容。我有一张销售表和一张产品表

这是我尝试时遇到的错误

---

感谢您的帮助。

我想出来了

由于某种原因，查询未从产品数据库中获取解锁代码字段。所以我把它从

function get_product($pid) {
    $res = $this->db->get_where($this->table, array('pid' => $pid), 1);
    if ($res->num_rows() > 0) {
        return $res->first_row('array');
    }
    return false;
}

到

那就对了

---

谢谢你提供的帮助

如果你

var\u dump（$product->result（））

，解锁代码输出了吗？我会试试的谢谢你没有乐趣我很震惊你能发布你的代码吗<代码>$this->m_products->get_product（）函数get_product（$pid）{$res=$this->db->get_where（$this->表，数组（'pid'=>$pid），1）；if（$res->num_rows（）>0）{返回$res->第一行（'array'）；}返回false；}

 // Load libraries
    $this->load->library('AppSettings');
    //  Load models
    $this->load->model('m_customers');
    $this->load->model('m_products');

    // Get customer and product data
    $customer  = $this->m_customers->by_cid($sale['cid']);
    $product  = $this->m_products->get_product($sale['pid']);

    $configs = array(
        'protocol'  => $this->appsettings->get('email_method'),
        'smtp_host' => $this->appsettings->get('smtp_host'),
        'smtp_user' => $this->appsettings->get('smtp_username'),
        'smtp_pass' => $this->appsettings->get('smtp_password'),
        'smtp_port' => $this->appsettings->get('smtp_port'),
        'smtp_crypto' => $this->appsettings->get('smtp_crypto'),
    );



    $this->load->library("email", $configs);

    $this->email->set_newline("\r\n");
    $this->email->to($customer['cust_email']);
    $this->email->from(
        $this->appsettings->get('support_email'), 
        $this->appsettings->get('support_contact_person')
    );

    $search = array(
        '%CUSTOMER NAME%',
        '%CUSTOMER EMAIL%',
        '%PRODUCT NAME%',
        '%PRODUCT PRICE%',
        '%DOWNLOAD LINK%',
        '%DOWNLOAD EXPIRY%',
        '%UNLOCK CODE%',

    );

    $replace = array(
        $customer['cust_firstname'].' '.$customer['cust_lastname'],
        $customer['cust_email'],
        $product['name'],
        $product['price'],
        site_url('download/'.$sale['download_code']),
        $product['expiry'],
        $product['unlock_code'],
    );

function get_product($pid) {
    $res = $this->db->get_where($this->table, array('pid' => $pid), 1);
    if ($res->num_rows() > 0) {
        return $res->first_row('array');
    }
    return false;
}

function get_product($pid) {
    $res = $this->db->select('*')->get_where($this->table, array('pid' => $pid), 1);
    if ($res->num_rows() > 0) {
        return $res->first_row('array');
    }
    return false;
}