PHP開發簡單圖書借閱系統完整主頁程式碼實現
本節實現如下圖的主頁功能代碼
主頁為index.php,包含分類選擇，使用者退出，借書還書功能，各種分頁顯示。
<?php
include("config.php");
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图书管理系统主页面</title>
<style>
body,td,th {font-family: 微软雅黑;font-size: 9px;color: #222;}
body {background-color: #FFFFFF;line-height:20px;}
a:link {color: #222;text-decoration: none;}
a:visited {text-decoration: none;color: #222;}
a:hover {text-decoration: underline;color: #FF0000;}
a:active {text-decoration: none;color: #999999;}
</style>
</head>
<body>
<?php include("head.php");?>
<table width="782" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td height="22">
<?php
$pagesize=5; //每页显示5条数据
if(!urldecode($_GET['proid'])){
//urldecode()函数将 URL 编码后字符串还原成未编码的样子。编码使用 %## 的格式
$sql="select * from yx_books order by id desc"; //倒序排列
}else{
$sql="select * from yx_books where type='".urldecode($_GET['proid'])."'";
//将查询出来的书目类别中文字转换为编码形式
}
$rs=mysqli_query($link,$sql);
$recordcount=mysqli_num_rows($rs); //输出查询的总数
//mysql_num_rows() 返回结果集中行的数目。此命令仅对 SELECT 语句有效。
$pagecount=($recordcount-1)/$pagesize+1; //计算总页数
$pagecount=(int)$pagecount;
$pageno=empty($_GET["pageno"])?'':$_GET["pageno"]; //当前页
if($pageno=="") //当前页为空时显示第一页
{
$pageno=1;
}
if($pageno<1) //当前页小于第一页时显示第一页
{
$pageno=1;
}
if($pageno>$pagecount) //当前页数大于总页数时显示总页数
{
$pageno=$pagecount;
}
$startno=($pageno-1)*$pagesize; //每页从第几条数据开始显示
if(!urldecode($_GET["proid"])){
$sql="select * from yx_books order by id desc limit $startno,$pagesize";
}else{
$sql="select * from yx_books where type='".urldecode($_GET['proid'])."'
order by id desc limit $startno,$pagesize";
}
$rs=mysqli_query($link,$sql);
?>
<table width="100%" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td width="88" height="30" align="center" bgcolor="#FFFFFF" class="line2">ID</td>
<td width="103" align="center" bgcolor="#FFFFFF" class="line2">书名</td>
<td width="77" align="center" bgcolor="#FFFFFF" class="line2">价格</td>
<td width="152" align="center" bgcolor="#FFFFFF" class="line2">入库时间</td>
<td width="107" align="center" bgcolor="#FFFFFF" class="line2">类别</td>
<td width="126" align="center" bgcolor="#FFFFFF" class="line2">现有数量(本)</td>
<td width="121" align="center" bgcolor="#FFFFFF" class="line2">操作</td>
</tr>
<?php
if(!empty($rs)){
while($rows=mysqli_fetch_array($rs))
{
?>
<tr>
<td height="30" align="center" bgcolor="#FFFFFF"><?php echo $rows["id"];?></td>
<td align="center" bgcolor="#FFFFFF"><?php echo $rows["name"];?></td>
<td align="center" bgcolor="#FFFFFF"><?php echo $rows["price"];?></td>
<td align="center" bgcolor="#FFFFFF"><?php echo $rows["uploadtime"];?></td>
<td align="center" bgcolor="#FFFFFF"><?php echo $rows["type"];?></td>
<td align="center" bgcolor="#FFFFFF"><?php echo $rows["leave_number"];?></td>
<td align="center" bgcolor="#FFFFFF" class="line2">
<?php
$rs2=mysqli_query($link,"select * from lend where book_id='".$rows['id']."'
and user_id='".$_SESSION['id']."'");
$rows2=mysqli_fetch_assoc($rs2);
if($rows2['book_id']){
echo "<font color='red'>您已借阅</font>
<a href=huanshu.php?book_id=".$rows['id'].">我要还书</a>";
}else{
if($rows["leave_number"]==0){
echo "<font color='#cccc00'>该书已借完</font>";
}else{
echo "<a href=jieshu.php?book_id=".$rows['id'].">我要借书</a>";
}
}
?> </td>
</tr>
<?php
}
}
?>
</table>
<table width="100%" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td height="35" align="center" bgcolor="#FFFFFF">
<?php
if($pageno==1)
{
?>
首页 | 上一页 |
<?php if($pageno+1<= $pagecount) { ?>
<a href="index.php?proid=<?php echo empty($_GET['proid'])?'':urlencode($_GET['proid']);?>
&pageno=<?php echo $pageno + 1 ?>">下一页</a> |
<a href="index.php?proid=<?php echo empty($_GET['proid'])?'':urlencode($_GET['proid']);?>
&pageno=<?php echo $pagecount ?>">末页</a>
<?php
}
}
else if($pageno==$pagecount)
{
?>
<a href="index.php?proid=<?php echo urlencode($_GET['proid']);?>&pageno=1">首页</a> |
<a href="index.php?proid=<?php echo urlencode($_GET['proid']);?>
&pageno=<?php echo $pageno-1?>">上一页</a> | 下一页 | 末页
<?php
}
else
{
?>
<a href="index.php?proid=<?php echo urlencode($_GET['proid']);?>&pageno=1">首页</a> |
<a href="index.php?proid=<?php echo urlencode($_GET['proid']);?>
&pageno=<?php echo $pageno-1?>">上一页</a> |
<a href="index.php?proid=<?php echo urlencode($_GET["proid"]);?>
&pageno=<?php echo $pageno+1?>" class="forumRowHighlight">下一页</a> |
<a href="?pageno=<?php echo $pagecount?>">末页</a>
<?php
}
?>
页次：<?php echo $pageno ?>/<?php echo $pagecount ?>
页 共有<?php echo $recordcount?>条信息</td>
</tr>
</table></td></tr>
</table>
<table width="782" height="30" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td height="19" align="center"> Copyright @ 2013-2016</td>
</tr>
</table>
</body>
</html>