📄 bookreturn.jsp~2~
字号:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Return Book</title>
<style type="text/css">
<!--
.style3 {font-size: 24px}
.style4 {font-size: 18px}
-->
</style></head>
<body>
<form name="form1" method="post" action="">
<table border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top" bgcolor="#000000">
<td height="100" colspan="2"><table width="100%" border="0" align="left" cellpadding="0" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td bgcolor="#FFFFFF"><img src="F:\example\图书馆\login\library1.gif" width="699" height="100" alt=""></td>
</tr>
</table></td>
</tr>
<tr>
<td height="449" align="left" valign="top" bgcolor="#000000"><table width="99%" border="0" align="left" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
<td valign="top" bgcolor="#CCCCCC"><table width="70%" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td width="20" align="right"> </td>
<td width="130" align="center"> </td>
</tr>
<tr>
<td width="20" align="right"><img src="F:\example\图书馆\login/library3.png" width="10" height="10" alt=""></td>
<td width="130" align="center"> <a href="userrights.jsp">UserRights</a> </td>
</tr>
<tr>
<td width="20" height="5" align="right"> </td>
<td width="130" height="5" align="center"><img src="F:\example\图书馆\login/library4.png" width="102" height="5" alt=""></td>
</tr>
<tr>
<td width="20" align="right"><img src="F:\example\图书馆\login/library3.png" width="10" height="10" alt=""></td>
<td width="130" align="center"><a href="modifyuser.jsp">ModifyMessage</a></td>
</tr>
<tr>
<td width="20" height="5" align="right"> </td>
<td width="130" height="5" align="center"><img src="F:\example\图书馆\login/library4.png" width="102" height="5" alt=""></td>
</tr>
<tr>
<td width="20" align="right"><img src="F:\example\图书馆\login/library3.png" width="10" height="10" alt=""></td>
<td width="130" align="center"><a href="booksearch.jsp">BookSearch</a></td>
</tr>
<tr>
<td width="20" align="right"> </td>
<td width="130" align="center"><img src="F:\example\图书馆\login/library4.png" width="102" height="5" alt=""></td>
</tr>
<tr>
<td width="20" align="right"><img src="F:\example\图书馆\login/library3.png" width="10" height="10" alt=""></td>
<td width="130" align="center"><a href="bookreturn.jsp">BookReturn</a></td>
</tr>
<tr>
<td width="20" align="right"> </td>
<td width="130" align="center"><img src="F:\example\图书馆\login/library4.png" width="102" height="5" alt=""></td>
</tr>
<tr>
<td width="20" align="right"><img src="F:\example\图书馆\login/library3.png" width="10" height="10" alt=""></td>
<td width="130" align="center"><a href="haveborrow.jsp">HaveBorrow</a></td>
</tr>
<tr>
<td width="20" align="right"> </td>
<td width="130" align="center"><img src="F:\example\图书馆\login/library4.png" width="102" height="5" alt=""></td>
</tr>
</table></td>
</tr>
<tr>
<td height="230" valign="top" bgcolor="#CCCCCC"> </td>
</tr>
</table></td>
<td height="449" align="left" valign="top"><table width="80%" border="1" align="center" cellpadding="10" cellspacing="1">
<tr align="center">
<td height="50" colspan="2"><span class="style3">Return Book </span></td>
</tr>
<tr>
<td width="37%" height="30" align="right" ><span class="style4">Title:</span></td>
<td width="63%" height="30"><span class="style4">
<input name="title" type="text" id="title" size="10" maxlength="8">
***</span></td>
</tr>
<tr>
<td height="30" colspan="2" align="right"> <table width="60%" border="0" align="center" cellpadding="0" cellspacing="1">
<tr>
<td width="50%" align="center"><input name="enter" type="submit" id="enter" value="Enter"></td>
<td width="50%" align="center"><input name="reset" type="reset" id="reset" value="Reset"></td>
</tr>
</table></td>
</tr>
</table></td>
</tr>
<tr>
<td bgcolor="#666666"> </td>
<td><img src="F:\example\图书馆\login/library2.png" width="573" height="40" alt=""></td>
</tr>
</table>
</form>
<jsp:useBean id="Library" scope="session" class="login.Library">
</jsp:useBean>
<%
try{
int flag=0,flag1=0;String studentnumber="";
String id=Library.getid();
Connection conn=Library.getConn();
Statement stmt,stmt1;
stmt = conn.createStatement();
stmt1 = conn.createStatement();
ResultSet rs4 = stmt.executeQuery("select * from borrowbook where id ='" + id + "' and title ='" + request.getParameter("title") + "' and returndata = '0'");
if(rs4.next()){//判断在borrowbook表中是否有当前用户指定书名的书的未还记录，即returndata="0"
stmt1.executeUpdate("update borrowbook set returndata = '" + (new java.util.Date().getYear()*365 + new java.util.Date().getMonth()*31 + new java.util.Date().getDay()) + "' where title ='" + request.getParameter("title") + "'and id ='" + id + "' and returndata = '0'");
//一个用户不会有病到在一本书还没还的情况下，再借一本相同的书吧
ResultSet rs6 = stmt.executeQuery("select * from book where title ='" + request.getParameter("title") + "'");
while(rs6.next()){
int oldinbook = Integer.parseInt(rs6.getString("innumber"));
int oldoutbook = Integer.parseInt(rs6.getString("outnumber"));
String newinbook = "update book set innumber ='" + (oldinbook+1) +"' where title ='" + request.getParameter("title") + "'";
stmt1.executeUpdate(newinbook);
String newoutbook = "update book set outnumber ='" + (oldoutbook-1) +"' where title ='" + request.getParameter("title") + "'";
stmt1.executeUpdate(newoutbook);
// out.println("<p>You succeed in returning this book.</p>");
}
}
}catch (Exception ex) {
response.sendRedirect("fail.jsp");
ex.printStackTrace();}
%>
</body>
</html>
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