Question

我正在从任何mysql客户端执行此查询，并且它正在运行：

SELECT
  q.calldate,
  q.dst,
  @ts_dnd_activate   := IF(q.dst='*78',q.calldate,@ts_dnd_activate) AS dndact,
  @ts_dnd_deactivate := IF(q.dst='*79',q.calldate,NULL) AS dnddeact,
  TIMESTAMPDIFF(SECOND,@ts_dnd_activate,@ts_dnd_deactivate) AS tdiff
FROM
  (SELECT calldate,dst
   FROM cdr
   WHERE calldate>='2012-01-09 11:12:08' AND src=1004 AND dst IN ('*78','*79')
   ORDER BY calldate DESC) q

它从表中获取两个字段，并根据dst字段的值，使用mysql变量计算calldates字段之间的差异，这是一个时间戳。

如果我在PHP代码中运行此查询：

[...]
$q = "SELECT
        q.calldate,
        q.dst,
        @ts_dnd_activate   := IF(q.dst='*78',q.calldate,@ts_dnd_activate) AS dndact,
        @ts_dnd_deactivate := IF(q.dst='*79',q.calldate,NULL) AS dnddeact,
        TIMESTAMPDIFF(SECOND,@ts_dnd_activate,@ts_dnd_deactivate) AS tdiff
      FROM
       (SELECT calldate,dst
        FROM cdr
        WHERE calldate>='2012-01-09 11:12:08' AND src=1004 AND dst IN ('*78','*79')
        ORDER BY calldate DESC) q";
$rs = mysql_query($q,$database);
[...]

我永远不会得到tdiff字段，因为我得到的行mysql变量总是为NULL，如下所示：

Array
(
    [calldate] => 2012-01-09 12:20:10
    [dst] => *78
    [dndact] => 2012-01-09 12:20:10
    [dnddeact] => 
    [tdiff] => 
)
Array
(
    [calldate] => 2012-01-09 12:22:05
    [dst] => *79
    [dndact] => 
    [dnddeact] => 2012-01-09 12:22:05
    [tdiff] => 
)
Array
(
    [calldate] => 2012-01-09 12:25:15
    [dst] => *78
    [dndact] => 2012-01-09 12:25:15
    [dnddeact] => 
    [tdiff] => 
)
Array
(
    [calldate] => 2012-01-09 12:29:21
    [dst] => *79
    [dndact] => 
    [dnddeact] => 2012-01-09 12:29:21
    [tdiff] => 
)

请注意，它是一个单一的查询，但似乎不可能在php mysql基本扩展中使用mysql变量，因为我不知道为什么但似乎每行都设置为null。

我做错了什么？这是一个新问题吗？

P.S。请不要告诉我我要使用PDO或mysqli;这是一个我无法重写的旧项目。

如何在php mysql扩展中使用mysql变量？

0 个答案: