php - 排序顺序参数

Question

我正在尝试通过执行以下操作将变量传递给 DB::select(DB::raw('')) 的 order by 片段:

 ....order by :sort :order;'), array('sort' => $sort, 'order' => $order));

我在 :order 上遇到语法错误有什么原因吗？

如果我将 :sort 替换为包含 qtSTDDEV 的列，:order 上的错误仍然存​​在

代码

$sort  = 'qtSTDDEV';
$order = 'order';

DB::select(DB::raw('SELECT mid         as mID,
   round((x.qty_sum / x.qty_count), 5) as qtAVG,
   round(x.qty_stddev, 5)              as qtSTDDEV,
   x.qty_count                         as qtCOUNT,
   round((x.rel_sum / x.rel_count), 5) as relAVG,
   round(x.rel_stddev, 5)              as relSTDDEV,
   x.rel_count                         as relCOUNT,
FROM (SELECT mid,
         SUM( mt = 'qt' )   as qty_count,
         SUM(CASE WHEN mt = 'qt' THEN rt END)  as qty_sum,
         STD(CASE WHEN mt = 'qt' THEN rt END)  as qty_stddev,
         SUM( mt = 'rel' ) as rel_count,
         SUM(CASE WHEN mt = 'rel' THEN rel END) as rel_sum,
         STD(CASE WHEN mt = 'rel' THEN rel END) as rel_stddev
  FROM t_r r
right join t_m t on t.mid = r.mid
  GROUP BY mid
 ) x
right join m_k m on m.mid = x.mid
right join k_d k on k.kid = m.kid
order by :sort :order;'), array('sort' => $sort, 'order' => $order));

Answer 1

您发布的代码不是有效的 PHP，因此很难提供 100% 肯定的答案。

但是，可以肯定的是列名不能作为绑定(bind)参数传递。您需要从 PHP 代码生成那部分 SQL 查询。

此外，order by 子句中的列名需要用逗号分隔。

我猜你想替换这个:

order by :sort :order;'), array('sort' => $sort, 'order' => $order));

与:

order by ' . $sort . ', ' . $order . ';'));