Question

我试图通过WordPress get_results函数从返回对象获取值，但是没有成功

示例代码

$myrows = $wpdb->get_results("SELECT SUM(view) as dviews FROM view_count WHERE post_id = '$pid'");

echo $myrows->dviews;   // echo nothing

所以任何想法如何从中获取整数返回dviews。

Answer 1

首先，如果您只想获得一条记录，请使用get_row() 代替get_results()，因为它将获取所有检索到的数据通过SQL查询。

单曲

$result = $wpdb->get_row("SELECT SUM(view) as dviews FROM view_count WHERE post_id = '$pid'");
echo $result->dviews;

对于多个记录

$results = $wpdb->get_results("SELECT SUM(view) as dviews FROM view_count WHERE post_id = '$pid'");
foreach ($results as $result)
{
    echo $result->dviews;
}

请注意：如果您有表格前缀，请使用$wpdb->prefix获取正确的表名。

希望这有帮助！

Answer 2

尝试这样的事情，

foreach( $wpdb->get_results("SELECT SUM(view) as dviews FROM view_count WHERE post_id = '".$pid."';") as $key => $row) {
    // each column in your row will be accessible like this
        echo $row->column_name;
    }

它应该有用。

Answer 3

试试这个

$myrows = $wpdb->get_results("SELECT SUM(view) as dviews FROM view_count WHERE post_id =".$pid."");
foreach($myrows as $item)
{
echo $item->dviews;
}

Answer 4

请添加表的前缀，并在查询中将$ wpdb声明为全局变量。我已将您的查询修改为：

global $wpdb;
$myrows = $wpdb->get_results("SELECT SUM(view) as {prefix}dviews FROM view_count WHERE post_id = '$pid'");

echo $myrows[0]->dviews;

Wordpress如何从get_results函数中获取值

4 个答案: