我正在尝试使用 PHP/PDO 学习分页。
$limit = 20;
$sth = $conn->prepare("SELECT * FROM directory WHERE user_active != ''");
$sth->execute(array(':county' => $county));
$c = 1;
while ($row = $sth->fetch(PDO::FETCH_ASSOC)) {
echo 'Resutls will be here';
$c++;
}
我不确定下一步该做什么，有没有人可以参考，或者可以为我解释这个过程？
谢谢
【问题讨论】：
未测试
$page = 1;
$limit = 20;
$start = $page * $limit;
$conn->setAttribute(PDO::ATTR_EMULATE_PREPARES, FALSE);
$sth = $conn->prepare("SELECT * FROM directory WHERE user_active LIMIT ?,?");
$sth->execute(array($start,$limit));
【讨论】：
请使用以下代码使用 PDO 进行分页：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Simple Pagination Demo using PDO Query</title>
<!-- CSS File -->
<link href="css/pagination.css" rel="stylesheet">
</head>
<body>
<?php
// mysql hostname
$hostname = 'localhost';
// mysql username
$username = 'root';
// mysql password
$password = '';
// Database Connection using PDO with try catch method.
try { $dbh = new PDO("mysql:host=$hostname;dbname=PaginationTestDb", $username, $password); }
// In case of error PDO exception will show error message.
catch(PDOException $e) { echo $e->getMessage(); }
// No. of adjacent pages shown on each side
$adjacents = 2;
// We will assign variable here for entry By. you can use your variables here.
$EntryBy = "furqan.aziz";
// We Will prepare SQL Query
$STM = $dbh->prepare("SELECT ServerName FROM statstracker WHERE EntryBy = :EntryBy");
// bind paramenters, Named paramenters alaways start with colon(:)
$STM->bindParam(':EntryBy', $EntryBy);
// For Executing prepared statement we will use below function
$STM->execute();
// Count no. of records
$Records = $STM->rowCount();
// Your File Name will be the same like your php page name which is index.php
$targetpage = "index.php";
// Below is setting for no. of records per page.
$limit = 10;
$page = $_GET['page'];
if($page)
//First Item to dipaly on this page
$start = ($page - 1) * $limit;
else
//if no page variable is given, set start to 0
$start = 0;
// Get data using PDO prepare Query.
$STM2 = $dbh->prepare("SELECT `SrNo`, `ServerName`, `HiMemUti`, `AvgMemUti`, `HiCpuUti`, `AvgCpuUti`, `HiIOPerSec`, `AvgIOPerSec`, `HiDiskUsage`, `AvgDsikUsage`, `EntryBy` FROM statstracker WHERE EntryBy = :EntryBy ORDER BY SrNo LIMIT $start, $limit");
// bind paramenters, Named paramenters alaways start with colon(:)
$STM2->bindParam(':EntryBy', $EntryBy);
// For Executing prepared statement we will use below function
$STM2->execute();
// We will fetch records like this and use foreach loop to show multiple Results later in bottom of the page.
$STMrecords = $STM2->fetchAll();
// Setup page variables for display. If no page variable is given, default to 1.
if ($page == 0) $page = 1;
//previous page is page - 1
$prev = $page - 1;
//next page is page + 1
$next = $page + 1;
//lastpage is = total Records / items per page, rounded up.
$lastpage = ceil($Records/$limit);
//last page minus 1
$lpm1 = $lastpage - 1;
//Now we apply our rules and draw the pagination object. We're actually saving the code to a variable in case we want to draw it more than once.
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<div class='pagination'>";
//previous button
if ($page > 1)
$pagination.= "<a href='$targetpage?page=$prev'>Previous</a>";
else
$pagination.= "<span class='disabled'>Previous</span>";
//pages
if ($lastpage < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='$targetpage?page=$counter'>$counter</a>";
}
}
elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
{
//close to beginning; only hide later pages
if($page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='$targetpage?page=$counter'>$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href='$targetpage?page=$lpm1'>$lpm1</a>";
$pagination.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";
}
//in middle; hide some front and some back
elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
{
$pagination.= "<a href='$targetpage?page=1'>1</a>";
$pagination.= "<a href='$targetpage?page=2'>2</a>";
$pagination.= "...";
for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
{
if ($counter == $page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='$targetpage?page=$counter'>$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href='$targetpage?page=$lpm1'>$lpm1</a>";
$pagination.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";
}
//close to end; only hide early pages
else
{
$pagination.= "<a href='$targetpage?page=1'>1</a>";
$pagination.= "<a href='$targetpage?page=2'>2</a>";
$pagination.= "...";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='$targetpage?page=$counter'>$counter</a>";
}
}
}
//next button
if ($page < $counter - 1)
$pagination.= "<a href='$targetpage?page=$next'>Next</a>";
else
$pagination.= "<span class='disabled'>Next</span>";
$pagination.= "</div>\n";
}
//Below is a start of table in which we will show records using foreach loop.
echo "<table class='mytableP'>";
// For Exporting Records to Excel we will send $EntryBy in link and will gate it on ExportToExcel page for stats for this user.
echo"<tr><th th colspan=11>Simple Pagination Demo using PDO Queries</div></th></tr>";
echo"<a href='ExportToExcel.php?val=$EntryBy' target=_blank><img src='img/e2e.png' alt='Export To Excel' border='' class='e2e' /></a>";
echo"<tr><th>Sr#</th><th>Server</th><th>Hi Memory Utilization</th><th>Avg Memory Utilization</th><th>Hi CPU Utilization</th><th>Avg CPU Utilization</th><th>Hi I/O Utilization</th><th>Avg I/O Utilization</th><th>Hi Disk Usage</th><th>Avg Disk Usage</th><th>By</th></tr>";
// We use foreach loop here to echo records.
foreach($STMrecords as $r)
{
echo "<tr>";
echo "<td>" .$r[0] ."</td>";
echo "<td>" .$r[1] ."</td>";
echo "<td>" .$r[2] ."</td>";
echo "<td>" .$r[3] ."</td>";
echo "<td>" .$r[4] ."</td>";
echo "<td>" .$r[5] ."</td>";
echo "<td>" .$r[6] ."</td>";
echo "<td>" .$r[7] ."</td>";
echo "<td>" .$r[8] ."</td>";
echo "<td>" .$r[9] ."</td>";
echo "<td>" .$r[10] ."</td>";
echo "</tr>";
}
echo "</table>";
// For showing pagination below the table we will echo $pagination here after </table>. For showing above the table we will echo $pagination before <table>
echo $pagination;
// Closing MySQL database connection
$dbh = null;
?>
</body>
</html>
欲了解更多详情，请访问以下网站获取源代码和 CSS 样式
【讨论】：