题目内容

阅读下列说明,回答问题1至问题4,将解答填入答题纸的对应栏内。
[说明]
某单位资料室需要建立一个图书管理系统,初步的需求分析结果如下:
(1)资料室有图书管理员若干名,他们负责已购入图书的编目和借还工作,每名图书管理员的信息包括工号和姓名;
(2)读者可在阅览室读书,也可通过图书流通室借还图书,读者信息包括读者D、姓名、电话和E-mail,系统为不同读者生成不同的读者ID:
(3)每部书在系统中对应唯一的一条图书在版编目数据(CIP,以下简称书目),书目的基本信息包括ISBN号、书名、作者、出版商、出版年月,以及本资料室拥有该书的册数(以下简称册数),不同书目的ISBN号不相同:
(4)资料室对于同一书目的图书可拥有多册(本),图书信息包括图书ID、ISBN号、存放位置、当前状态,每一本书在系统中被赋予唯一的图书ID;
(5)一名读者最多只能借阅十本图书,且每本图书最多只能借两个月,读者借书时需由图书管理员登记读者ID、所借图书ID、借阅时间和应还时间,读者还书时图书管理员在对应的借书信息中记录归还时间。
某书目的信息以及与该书目对应的图书信息如下表所示。
系统的主要业务处理如F。
(1)入库管理:图书购进入库时,管理员查询本资料室的书目信息,若该书的书目尚未建立,则由管理员编写该书的书目信息并录入系统,然后编写并录入图书信息;否则,修改该书目的册数,然后编写并录入图书信息,对于进入流通室的书,其初始状态为“未借出”,而送入阅览室的书的状态始终为“不外借”。
(2)借书管理:读者借书日寸,若有,则由管理员为该读者办理借书手续,并记录该读者的借书信息,同时将借出图书的状态修改为“已借出”。
(3)还书管理:读者还书时,则记录相应借还信息中的“归还时间”,对于超期归还者,系统自动计算罚金(具体的计算过程此处省略)。同时修改该图书的状态为“未借出”。
(4)通知处理:对于已到期且未归还的图书,系统通过E-mail自动通知读者。
根据以上说明设计的实体联系图如下图所示,请指出读者与图书、书目与图书之间的联系类型。

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