Question

我需要选择作者（不同的），并为每个作者列出所属的标题，不超过六个月。

$items = '';
$sqla = "select distinct auth from posts order by date";
$sta = $db->prepare($sqla);
$sta -> execute();
while ($rowa = $sta->fetch()) {
    $items .= "<div class='auth'>" . mb_strtoupper($row['auth']) . "</div>\n";
    $sqlb = "select id, date, title, subtitle, tags, from posts where `auth` = '" . $rowa['auth'] . "' and `date` < date(now() - interval 6 month)";
    $stb = $db->prepare($sqlb);
    $stb -> execute(); // line 29
    while ($rowb = $stb->fetch()) {
        $items .= $rowb['title'] . '\n'; 
    }
}

echo $items;

第29行致命错误。

Answer 1

您可以使用单个查询

     select distinct auth,id, date, title, subtitle, tags 
     from posts 
     where  `date` < date(now() - interval 6 month)
     order by date

无论如何，你的第二个查询中有错误（标签），从

之前删除逗号

 $sqlb = "select id, date, title, subtitle, tags from posts where `auth` = '" . $rowa['auth'] . "' and `date` < date(now() - interval 6 month)";

对于作者，你应该参考$ rowa

$items .= "<div class='auth'>" . mb_strtoupper($rowa['auth']) . "</div>\n";

列出作者和所属标题

1 个答案: