PHP+Mysql開(kāi)發(fā)分頁(yè)之顯示總頁(yè)數(shù)
顯示總的頁(yè)數(shù)
<html>
<head>
<meta http-equiv="CONTENT-TYPE" content="text/html;">
</head>
<body>
<?php
/** 1.傳入頁(yè)面 **/
$page = $_GET['p'];
/** 2.根據(jù)頁(yè)面取出數(shù)據(jù)：php->mysql **/
$host = "localhost";
$username = 'root';
$password = '123456789';
$db = 'bbs2';
$PageSize=5;
//連接數(shù)據(jù)庫(kù)
$conn = mysql_connect($host, $username, $password);
if(!$conn){
echo "數(shù)據(jù)庫(kù)連接失敗";
exit;
}
//選擇所要操作的數(shù)據(jù)庫(kù)
mysql_select_db($db);
//設(shè)置數(shù)據(jù)庫(kù)編碼格式
mysql_query('SET NAMES UTF8');
//編寫(xiě)sql獲取分頁(yè)數(shù)據(jù)：SELECT * FROM 表名 LIMIT 起始位置 , 顯示條數(shù)
$sql = "SELECT*FROM test LIMIT ".($page-1)*$PageSize .",$PageSize";
if(!$sql){
echo "取出不成功";
};
//把sql語(yǔ)句傳送到數(shù)據(jù)庫(kù)
$result = mysql_query($sql);
//處理我們的數(shù)據(jù)
echo "<table border=1 cellspacing=0 width=15% >";
echo "<tr><td>ID</td><td>名字</td><td>性別</td></tr>";
while($row = mysql_fetch_assoc($result)){
echo "<tr>";
echo "<td>{$row['id']}</td>";
echo "<td>{$row['name']}</td>";
echo "<td>{$row['sex']}</td>";
echo "<tr>";
}
//釋放結(jié)果
mysql_free_result($result);
//獲取數(shù)據(jù)總數(shù)
$to_sql="SELECT COUNT(*)FROM test";
$to_result=mysql_fetch_array(mysql_query($to_sql));
$to=$to_result[0];
//計(jì)算頁(yè)數(shù)
$to_pages=ceil($to/$PageSize);
mysql_close($conn);
/** 3.顯示數(shù)據(jù)+分頁(yè)條 **/
$page_banner="<a href='".$_SERVER['PHP_SELF']."?p=".($page-1)."'>上一頁(yè)</a>";
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($page+1)."'>下一頁(yè)</a>";
$page_banner.="共{$to_pages}頁(yè)";
echo $page_banner;
?>
</body>
</html>代碼解釋
//獲取數(shù)據(jù)總數(shù) $to_sql="SELECT COUNT(*)FROM test"; $to_result=mysql_fetch_array(mysql_query($to_sql)); $to=$to_result[0]; //計(jì)算頁(yè)數(shù) $to_pages=ceil($to/$PageSize); mysql_close($conn);
本章難點(diǎn)
$to_sql：用來(lái) 計(jì)算數(shù)據(jù)的總數(shù)
$to_result：連接計(jì)算出來(lái)的總數(shù)，并取得數(shù)據(jù)
$to就是取得的總條數(shù)
$to_pages計(jì)算出頁(yè)數(shù)? $to/$PageSize每頁(yè)顯示的數(shù)據(jù)獲得顯示多少頁(yè)，
ceil向上去整數(shù)，這樣余下的數(shù)也能顯示出來(lái)。
