MySQL? LIMIT ? OFFSET? ???? PHP?? ?????? ??? ??? ???? ??? ??????
Jan 05, 2025 am 03:13 AM
MySQL LIMIT, OFFSET with Response? ??? ??? ??
??? ??? ???? ? ??? ???? ??? ??? ??? ??? ? ?? ?? ??? ???? ??? ? ????. . MySQL? ??? ??? ???? ?? LIMIT ? OFFSET ?? ?????.
??:
????? ?? ??? ?? ?? ???? ?????? ???? ???? ????? ?? ???? ???? ???. ?????? ??? ??? ?????? ?? logic.
???:
??? ?? URL? ??? ??? ????? ?????.
http://yoursite.com/itempage.php?page=2
??? ???? ??? ??? ??? ???? ? ????. $_GET['page'].
???? ???? ???? ???? ????? SQL ??? ?????. number:
// determine page number from $_GET
$page = 1;
if(!empty($_GET['page'])) {
$page = filter_input(INPUT_GET, 'page', FILTER_VALIDATE_INT);
if(false === $page) {
$page = 1;
}
}
// set the number of items to display per page
$items_per_page = 4;
// build query
$offset = ($page - 1) * $items_per_page;
$sql = "SELECT * FROM menuitem LIMIT " . $offset . "," . $items_per_page;
? ??? ?? ????? ???? ? ?? ???? ???.
$sql = "SELECT your_primary_key_field FROM menuitem";
$result = mysqli_query($con, $sql);
$row_count = mysqli_num_rows($result);
// free the result set as you don't need it anymore
mysqli_free_result($result);
$page_count = 0;
if (0 === $row_count) {
// maybe show some error since there is nothing in your table
} else {
// determine page_count
$page_count = ceil($row_count / $items_per_page);
// double check that request page is in range
if($page > $page_count) {
// error to user, maybe set page to 1
$page = 1;
}
}
???? ??? ???? ??? ? ??? ??? ? ????. ??? ??? ???? ?? $page ? $page_count ??:
// later when outputting page, you can simply work with $page and $page_count to output links
// for example
for ($i = 1; $i <= $page_count; $i++) {
if ($i === $page) { // this is current page
echo 'Page ' . $i . '<br>';
} else { // show link to other page
echo '<a href="/menuitem.php?page=' . $i . '">Page ' . $i . '</a><br>';
}
}? ??? MySQL? LIMIT ? OFFSET? ???? PHP?? ?????? ??? ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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