<?php include("config.php");?>
<html>
<head>
<meta charset="UTF-8">
<title>借书功能页</title>
</head>
<body>
<?php
// 如果图书编号没填写，提示用户
$book_id = $_GET['book_id'];
if ($book_id==""){
//echo "<script language=javascript>alert('编号不正确');window.location='index.php'</script>";
exit();
}
else {
?>
<?php
// 借书
// 查看用户ID是否已填
if ($_SESSION['id']==""){
//echo "<script language=javascript>alert('您还没有登陆');window.location='landing.php'</script>";
exit();
}else{
// 可以正常借书，记录之
// 获得当前日期
$now = date("Y-m-d,H-i-m");
$lendsql="INSERT INTO lend(book_id, book_title, lend_time, user_id) values('$book_id','$title','$now','".$_SESSION['id']."')";
mysqli_query($link,$lendsql);
// 借出后需要在该书记录中库存剩余数减一
mysqli_query($link,"update yx_books set leave_number=leave_number-1 where id='$book_id'");
//echo "<script language=javascript>alert('借阅完成');window.location='index.php'</script>";
?>
<?php
}
}
?>
</body>
</html>
