Question

我想计算总行数，样本：

row1 = 1
row2 = 1
row3 = -1
row4 = 1
row5 = -1

总计= 1，因为1 + 1 +（ - 1）+1 +（ - 1）= 1

我想从数据库中计算

我的代码是：

<?  $result_count_like = mysql_query("SELECT * FROM like_mood WHERE img_id='$imageid'");
while($row_like_co = mysql_fetch_array($result_count_like))
  {
  $total_num=$row_like_co['mood_num']; // THIS IS ROWS NAME
    }
 ?>

谢谢：）

Answer 1

...试

SELECT SUM(mood_num) FROM like_mood WHERE img_id= '$imageid'

例如..

$sql = mysql_query("SELECT SUM(mood_num) FROM like_mood WHERE img_id= '$imageid'");
$sql = mysql_fetch_array($sql);
$total = $sql[0];

Answer 2

<?
$toCount = array();
$result_count_like = mysql_query("SELECT * FROM like_mood WHERE img_id='$imageid'");
while($row_like_co = mysql_fetch_array($result_count_like))
{
  $toCount[]=$row_like_co['mood_num']; // THIS IS ROWS NAME
}

echo array_sum($toCount);

?>

php计数总计行数

2 个答案: