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如何做写一套图书馆管理系统（三）借阅管理

2016-01-30 14:31 344 查看
接下来，是书本与读者之间借阅关系的管理。

第一步仍然是确定数据表。

这是追求理想型问题，我们从目的定位出发。

管理借阅记录的目的是记录每一本图书的借阅状态，防止图书丢失。

所以，我们的字段分为三种类型，第一种类型能准确定位到被借的图书，第二种准确定位到借书的人，第三种能准确定位到借书这件事情。

那么最基本的三个字段即可：书的条形码、读者编号、借书时间。

再给一个id用于记录借阅记录数。

所以数据表结构为：

idbarcodereadernumborrowtime
int(10)int(100)int(100)datetime()
create table borrows(
id int(10) auto_increment primary key,
barcode int(10) not null,
readernum int(10) not null,
borrowtime datetime);

下一步是借阅的主页：

borrows.php

<html>
<span style="white-space:pre">	</span><head>
<span style="white-space:pre">		</span><title>借阅档案管理</title>
<span style="white-space:pre">	</span></head>
<span style="white-space:pre">	</span><body>
<span style="white-space:pre">		</span><form method = "POST" action = "">
<span style="white-space:pre">		</span><select name = "searchtype">
<span style="white-space:pre">			</span><option value = "readernumber">读者编号</option>
<span style="white-space:pre">			</span><option value = "paperstype">图书条形码</option>
<span style="white-space:pre">			</span><option value = "all">全部</option>
<span style="white-space:pre">		</span></select>
<span style="white-space:pre">		</span><input name = "key" type = "text"></input>
<span style="white-space:pre">		</span><button type = "submit">提交</button>
<span style="white-space:pre">		</span><a href = "borrows_add.php">借书</a>
<span style="white-space:pre">		</span><a href = "borrows_return.php">还书</a>
<span style="white-space:pre">		</span></form>
<span style="white-space:pre">		</span><table>
<span style="white-space:pre">			</span><tr>
<span style="white-space:pre">				</span><th>书名</th>
<span style="white-space:pre">				</span><th>条形码</th>
<span style="white-space:pre">				</span><th>读者姓名</th>
<span style="white-space:pre">				</span><th>读者编号</th>
<span style="white-space:pre">				</span><th>借书时间</th>
<span style="white-space:pre">				</span><th>是否归还</th>
<span style="white-space:pre">			</span></tr>
<span style="white-space:pre">			</span><?php
<span style="white-space:pre">				</span>include "conn/conn.php";
<span style="white-space:pre">				</span>/*只知道一个表的主键，怎么通过这个主键去寻找并填充其他主键？
<span style="white-space:pre">					</span>方法之一是，先把这个主键
<span style="white-space:pre">				</span>*/
<span style="white-space:pre">				</span>@$f = $_POST['searchtype'];
<span style="white-space:pre">				</span>@$key = $_POST['key'];
<span style="white-space:pre">				</span>$sql = mysql_query("select * from borrows;");
<span style="white-space:pre">				</span>$info = mysql_fetch_array($sql);
<span style="white-space:pre">				</span>if($info == false)
<span style="white-space:pre">					</span>echo "No Records!";
<span style="white-space:pre">				</span>else if($info == true){
<span style="white-space:pre">					</span>if($key == ""||$f=="all"){
<span style="white-space:pre">				</span>do{
<span style="white-space:pre">			</span>?>
<span style="white-space:pre">			</span><tr>
<span style="white-space:pre">				</span><td><?php echo $info['bookname'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['barcode'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['readername'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['readernum'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['borrowtime'];?></td>
<span style="white-space:pre">				</span><td><?php if($info['if_return']) echo "已归还";else{echo "未归还";}?></td>
<span style="white-space:pre">			</span><?php
<span style="white-space:pre">				</span>}while($info = mysql_fetch_array($sql)); 
<span style="white-space:pre">				</span>}else{
<span style="white-space:pre">					</span>$sql = mysql_query("select * from borrows where $f like '%$key%';"); //记住，列名是不需要加引号的。
<span style="white-space:pre">					</span>$info = mysql_fetch_array($sql);
<span style="white-space:pre">					</span>if($info == false)
<span style="white-space:pre">						</span>echo "No such records were found！";
<span style="white-space:pre">					</span>else{
<span style="white-space:pre">				</span>do{
<span style="white-space:pre">			</span>?>
<span style="white-space:pre">			</span><tr>
<span style="white-space:pre">				</span><td><?php echo $info['bookname'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['barcode'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['readername'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['readernum'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['borrowtime'];?></td>
<span style="white-space:pre">				</span><td><?php echo $info['if_return'];?></td>
<span style="white-space:pre">			</span><?php<span style="white-space:pre">	</span>
<span style="white-space:pre">				</span>}while($info = mysql_fetch_array($sql));
<span style="white-space:pre">				</span>}
<span style="white-space:pre">				</span>}
<span style="white-space:pre">				</span>}
<span style="white-space:pre">			</span>?>
<span style="white-space:pre">		</span></table>
<span style="white-space:pre">	</span></body>
</html>

2.增加借书记录的页面，borrows_add.php

<html>
	<head>
		<title>添加借书信息</title>
	</head>
	<body>
		<form action = "borrows_add_ok.php" method = "POST">
		<label>被借书目条形码</label>
		<input type = "text" name = "barcode"></input></br>
		<label>借书读者编号</label>
		<input type = "text" name = "readernumber"></input></br>
		<button type = "submit" >提交</button>
		<input name="Submit2" type="button" value="返回" onClick="history.back();">
	</body>
</html>
3.borrows_add_ok.php

<?php
	include "conn/conn.php";
	$barcode = $_POST['barcode'];
	$readernumber = $_POST['readernumber'];
	$sql = mysql_query("select * from books where barcode = '$barcode'");
	$info = mysql_fetch_array($sql);
	$bookname = $info['bookname'];
	$sql = mysql_query("select * from readers where readernumber = '$readernumber'");
	$info = mysql_fetch_array($sql);
	$readername = $info['readername'];
	$borrowtime = date("Y-m-d h:i:m");
	mysql_query("insert into borrows (barcode,bookname,readernum,readername,borrowtime)values('$barcode','$bookname','$readernumber','$readername','$borrowtime')");
	echo "<script language='javascript'>alert('图书信息添加成功!');history.back();</script>";
?>
以上，完成了借阅记录的添加和查询。

这里我认为借阅记录还是不能被删除和修改的。

4.borrows_return.php

<html>
	<head>
		<title>还书</title>
	</head>
	<body>
		<form action = "borrows_return_ok.php" method = "POST">
		<label>书目条形码</label>
		<input type = "text" name = "barcode"></input></br>
		<button type = "submit" >归还</button>
		<input name="Submit2" type="button" value="放弃" onClick="history.back();">
	</body>
</html>
5.borrows_return_ok.php

<?php
	include "conn/conn.php";
	$barcode = $_POST['barcode'];
	mysql_query("update borrows set if_return = 1 where barcode = '$barcode'");
	echo "<script language='javascript'>alert('还书成功!');history.back();</script>";
?>
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