mysqli - 如何从查询中获取精确（$ ​​i）原始字段

Question

需要从$ i raw of mysqli object接收字段数据。

$res = $mysqli->query("SELECT mood,count(mood) as number FROM em_mood GROUP by mood ORDER by mood ASC");
$obj = $res->fetch_object();

for ($i = 1; $i <= 10; $i++){
    if ($i==$obj->mood[$i]) $mood_result .= "<div class='chart'>".$obj->mood[$i].$obj->number[$i]."</div>";
    else $mood_result .= "<div class='chart'>empty</div>";
}

说明： $ obj-＆gt;心情等于1到10。 如果$ obj->情绪缺失＆＃34; 2＆＃34;例如，我需要用空div交换它。 换句话说，获取字段[情绪]值的语法是什么让我们说第二个原始？像$ obj [2] [心情]？

更新

看起来像这样：

for ($i = 1; $i <= 10; $i++){
    $res = $mysqli->query("SELECT mood,count(mood) as number FROM em_mood WHERE date>=CURDATE()-INTERVAL 30 DAY and mood=".$i);
    $obj = $res->fetch_object();
    echo $obj->mood." - ".$obj->number."<br>";
}

有没有办法让这更简单？不要做10个mysqli查询？

Answer 1

$raw = [];
$sql = "SELECT mood,count(mood) as number FROM em_mood GROUP by mood";
$res = $mysqli->query($sql);
while ($obj = $res->fetch_object())
{
    $raw[$obj->mood] = $obj->number;
}

现在您可以获得“原始”数据

for ($i = 1; $i <= 10; $i++){
    if (isset($raw[$i])) {
        $mood_result .= "<div class='chart'>$i - $raw[$i]</div>";
    } else {
        $mood_result .= "<div class='chart'>empty</div>";
    }
}