[英]How to get the highest value from a database row?
我有個問題。 我有一個網頁網站,如果發布了一條消息,並且帖子下方顯示了帖子,則需要有圖片,但是在索引頁面的最后,我不想顯示圖片。 因此,就像數據庫中的ID最高,則帖子下方沒有圖像。
這是代碼:
<?php
include 'functions/image/functions.php';
$countQuery = $db->prepare("SELECT paginaNummer AS max FROM pages ;");
$countRow = $countQuery->fetch();
$maxId = $countRow['max'];
$query = $db->prepare("SELECT * FROM pages");
$query->execute();
$num_cols = 1;
$i = 0;
$imgList = getImagesFromDir($root . $path);
$img = getRandomFromArray($imgList);
while($row = $query->fetch()) {
if(isset($row)) {
echo "<section data-stellar-background-ratio='0.5'>";
echo "<div class='panelContainer'>";
echo "<div class='panel2'>";
echo "<div class='symbol3'></div>";
echo "</div>";
echo "</div>";
echo "</div>";
echo "</section>";
echo "<section class='wrapper'>";
echo "<div class='box'>";
echo "<div class='content'>";
echo $i++ % $num_cols == 0 ? '' : '';
echo "<div id='message'><h2> ", $row['berichtNaam'], "</h2>";
echo $row['paginaContent'], "<br />";
if (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 2) {
echo " <a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
echo " <a class='delete' href='functions/admin/deletePost.php?id=" . $pageNumber . " '>Delete</a>";
} elseif (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 1) {
echo " <a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
} else {
}
echo "</div>";
echo "</div>";
echo "</section>";
echo max($row);
if (count($row['paginaNummer']) == max($row)){
} else {
echo "<a href='/'><img src='<?php echo $path . $img ?>'alt=''/></a>";
}
echo "</section>";
}
}
echo "</div></div>";
?>
這部分我將不再贅述,希望您能幫助我解決這個問題
很難理解您的需求。 但是嘗試以下查詢:
$countQuery = $db->prepare("SELECT paginaNummer AS max
FROM pages ORDER BY paginaNummer DESC LIMIT 1");
也許是這樣的:
$countQuery = $db->prepare("SELECT paginaNummer AS max
FROM pages ORDER BY id DESC LIMIT 1");
更新:此代碼更改,而不是頂部:
<?php
include 'functions/image/functions.php';
$query = $db->prepare("SELECT * FROM pages");
$query->execute();
$maxrow = $query->rowCount();
$num_cols = 1;
$i = 0;
$imgList = getImagesFromDir($root . $path);
$img = getRandomFromArray($imgList);
$n = 0;
while($row = $query->fetch()) {
if(isset($row)) {
$n++;
echo "<section data-stellar-background-ratio='0.5'>";
echo "<div class='panelContainer'>";
echo "<div class='panel2'>";
echo "<div class='symbol3'></div>";
echo "</div>";
echo "</div>";
echo "</div>";
echo "</section>";
echo "<section class='wrapper'>";
echo "<div class='box'>";
echo "<div class='content'>";
echo $i++ % $num_cols == 0 ? '' : '';
echo "<div id='message'><h2> ", $row['berichtNaam'], "</h2>";
echo $row['paginaContent'], "<br />";
if (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 2) {
echo " <a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
echo " <a class='delete' href='functions/admin/deletePost.php?id=" . $pageNumber . " '>Delete</a>";
} elseif (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 1) {
echo " <a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
} else {
}
echo "</div>";
echo "</div>";
echo "</section>";
echo max($row);
if ($n == $maxrow){
} else {
echo "<a href='/'><img src='<?php echo $path . $img ?>'alt=''/></a>";
}
echo "</section>";
}
}
echo "</div></div>";
?>
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