Question

我想根据登录用户查看mysql中codeigniter中的数据但出现错误“发生数据库错误”。我想我写错了代码

t.USER = $this->session->userdata('user_id');

代码如下：

function get_rekomen() 
{
  $query = $this->db->query("SELECT
   c.*,
   t.produk_id,
   t.id_transdet,
   t.kategori_id,
   t.total_qty,
   t.USER 
FROM
   transaksi_detail AS t 
   LEFT JOIN
      (
         SELECT
            g.id_produk,
            p.slug_produk,
            p.foto,
            p.foto_type,
            p.harga_diskon,
            p.diskon,
            p.harga_normal,
            p.judul_produk,
            g.kat_id,
            k.judul_kategori 
         FROM
            (
               SELECT
                  MAX(m.id_produk) AS id_produk,
                  m.kat_id 
               FROM
                  produk AS m 
               GROUP BY
                  m.kat_id 
            )
            AS g 
            INNER JOIN
               produk AS p 
               ON p.id_produk = g.id_produk 
            LEFT JOIN
               kategori AS k 
               ON k.id_kategori = g.kat_id 
      )
      AS c 
      ON c.kat_id = t.kategori_id 
WHERE
   t.USER = $ this -> session -> userdata('user_id');
<<// i think here's the problem

ORDER BY
   total_qty DESC limit 1")->result(); 

return $query;
}

问题是什么是正确的代码？

Answer 1

这是一个解决方案，但首先请确保已在控制器上加载$this->load->library('session');，或者只需添加autoload.php。

此外，您还必须向模型中添加参数，该参数将在会话中处理user_id，因此例如，您的模型如下所示：

function get_rekomen($user_id) { ...your query here... }

然后使用user_id的条件将是

t.USER = $user_id;

因此，在您的控制器上，您可以像这样调用模型：

$user_id = $this->session->userdata('user_id');

$this->ModelClass->get_rekomen($user_id);

其他：在登录阶段，如果用户成功登录，则必须在会话上设置用户数据，例如$this->session->set_userdata('user_data', $session_data);

希望这会有所帮助！

Answer 2

也许您可以使用它。您需要先定义$ user_id，然后再将其添加到 WHERE 语句...

$user_id = $this->session->userdata('user_id');
$sql = "SELECT c.*, t.produk_id, t.id_transdet, t.kategori_id, t.total_qty, t.USER 
    FROM transaksi_detail AS t 
    LEFT JOIN(SELECT g.id_produk, p.slug_produk, p.foto, p.foto_type, p.harga_diskon, p.diskon, p.harga_normal, p.judul_produk, g.kat_id, k.judul_kategori
        FROM(SELECT MAX(m.id_produk) AS id_produk, m.kat_id
            FROM produk AS m 
            GROUP BY m.kat_id)
        AS g 
        INNER JOIN produk AS p ON p.id_produk = g.id_produk 
        LEFT JOIN kategori AS k ON k.id_kategori = g.kat_id)
    AS c ON c.kat_id = t.kategori_id
    WHERE t.USER = '$user_id'
    ORDER BY total_qty DESC limit 1";

    $query = $this->db->query($sql);
    return $query->result();

希望这可以帮助您...

如何在Codeigniter中基于用户查看数据

2 个答案: