Question

我想在我的网站上显示今天的数据，但如果今天还没有添加数据，我想显示昨天的数据。

这是我正在使用的代码的一部分，现在它显示今天和昨天两个数据是否可用，但我想只在今天显示两者是否可用。

我不知道，如何分开它们。任何人都可以指出我正确的方向吗？

    date_default_timezone_set('America/Los_Angeles');
$today = date('Y-m-d');
$yesterday = date('Y-m-d',strtotime("-1 days"));

$result = mysqli_query($bd, "SELECT * FROM apps WHERE datum = '".$today."' OR datum = '".$yesterday."' AND price > 0 ") or die(mysqli_error());
$count = mysqli_num_rows($result);
$cc = 0;

.....

$cc++;  
    if ($cc < $count) {
    echo "\n";

Answer 1

试试这个：

date_default_timezone_set('America/Los_Angeles');
$today = date('Y-m-d');
$yesterday = date('Y-m-d',strtotime("-1 days"));

$result = mysqli_query($bd, "SELECT * FROM apps WHERE datum = '".$today."' AND price > 0 ") or die(mysqli_error());
$count = mysqli_num_rows($result);
if($count == 0) {
    $result = mysqli_query($bd, "SELECT * FROM apps WHERE datum = '".$yesterday."' AND price > 0 ") or die(mysqli_error());
    $count = mysqli_num_rows($result);
}
$cc = 0;

.....

$cc++;  
    if ($cc < $count) {
    echo "\n";

Answer 2

您需要在查询末尾添加ORDER BY datum DESC LIMIT 1并阅读单行。

$query = "SELECT *
          FROM apps
          WHERE (datum = '".$today."'
             OR datum = '".$yesterday."')
             AND price > 0
          ORDER BY datum DESC
          LIMIT 1";

$result = mysqli_query($bd, $query) or die(mysqli_error());

if ($row = mysqli_fetch_row($result)) {
    // You have the data here
}

如何使用mysql和php仅显示今天或仅显示昨天的数据？

2 个答案: