Question

我有以下MySQL查询和PHP代码，用于将Count结果格式化为单个数组：

$equalDimensions_query = 
"SELECT 'allEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images
) AS union_table
WHERE primaryId = $imgId AND imgWidth = $maxImageWidth AND imgHeight = $maxImageHeight
UNION ALL
SELECT 'widthEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images
) AS union_table
WHERE primaryId = $imgId AND imgWidth = $maxImageWidth AND imgHeight != $maxImageHeight
UNION ALL
SELECT 'heightEqual' AS COL1,COUNT(*) AS imgCount FROM (
    SELECT imgHeight, imgWidth, imgId AS primaryId FROM primary_images  
    UNION ALL 
    SELECT imgHeight, imgWidth, primaryId FROM secondary_images
) AS union_table
WHERE primaryId = $imgId AND imgWidth != $maxImageWidth AND imgHeight = $maxImageHeight";

$equalDimensions_data = mysql_query($equalDimensions_query) or die('MySql Error' . mysql_error());

while ($row = mysql_fetch_assoc($equalDimensions_data)) { 
    $cnt[$row['COL1']] = $row['imgCount']; 
}

var_dump($cnt);

（注意我将var_dump($cnt)列为最后一行）

var_dump返回了以下数组：

array
(
  'allEqual' => string '2' (length=1)
  'widthEqual' => string '0' (length=1)
  'heightEqual' => string '0' (length=1)
)

我很好奇为什么计数作为字符串返回，而不是整数？

它应该作为整数返回吗？或者它是处理计数查询时的标准，结果是作为字符串返回？

感谢。

Answer 1

来自http://www.php.net/manual/en/function.mysql-fetch-assoc.php：

返回对应于的关联字符串数组 获取行，如果没有更多行，则返回FALSE。

（强调我的）MySQL驱动程序可能只是更容易为您提供一切字符串，并假设您将知道如何处理它。只需使用intval（）来获取整数值。

Answer 2

所有内容都以字符串¹的形式返回，无论它是否为列值（列的类型不起任何作用）或函数的结果（返回值的类型也不起作用）。

¹谈到MySql驱动程序时，至少。

PHP MySQL计数查询结果是字符串，而不是整数

2 个答案: