在线考试系统数据库设计(共30页).doc

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1、精选优质文档-倾情为你奉上数据库设计文档成员：曹丽琼 冯继伟 刘维毅 班级08软工三班 指导老师：郭东恩 日 期：2011-5-22 目录数据库设计文档1 引言1.1 编写目的本文档是本项目开发中至关重要的一部分，通过本档编写，对本项目中相关数据存储信息进行明确定位，对数据结构等相关信息进行明确说明。本文档尽可能的详细说明各个实体的属性及相互联系，使开发人员的开发效率尽可能增加。1.2 项目来源 实训要求 开发人员：全体成员 文档使用者：oracle 开发人员、 程序设计人员1.3 文档约定1.4 预期读者和阅读建议 开发人员： 对oracle和java熟悉 测试人员： 对java及oracl

2、e有一定的了解1.5 参考资料1 在线考试系统可行性分析2 在线考试系统需求分析3 项目（bbs）数据库设计文档刘维毅4 2 数据库命名规则 db_examonline: 在线考试系统数据库 tb_invigilate: 监考人员 tb_user: 学生或用户信息表 tb_select:选择题相关信息表 tb_answer:简答题相关信息 tb_boolean:判断题相关信息 tb_admin: 管理员信息表 tb_page:数据库测试试题3 数据库设计说明3.1 数据库逻辑设计数据字典l 考生属性：编号tid,姓名uname,登录密码upassword,学号uno,班级uclass,考试状态

3、ustatel 监考人员属性：编号tid,姓名name,登录密码passwordl 管理员属性：编号aid,姓名name,登录密码passwordl 试卷属性：编号pid,科目subject, 选择题数量snum, 判断题数量bnum, 问答题数量anum，考试时间pageDatel 选择题属性：编号id,题目name,选项A optionA,选项B optionB,选项C option C,选项D optionD,所属科目subjectl 判断题属性：编号id,题目name,对选项yes,错选项no ,所属科目subjectl 简答题属性：编号id,题目name, 所属科目subjectl

4、科目属性：编号sid,科目subject实体关系 编号姓名学号考试状态登录密码班级考生监考人员编号姓名登录密码管理员姓名登录密码编号考试试卷选择题数目判断题数目科目名称简答题数目编号编号题目选项A科目名称选项D选项B选项C选择题判断题题目科目名称编号考试时间简答题题目科目名称编号科目科目名称编号E_R图考生监考人员管理员选择题简答题判断题科目考试试卷组成监考管理做组成SR关系：学生关系表：Stb_user(usid,uname,upassword,uno,uclass,ustate)监考人员关系表:Stb_invigilate(tid,name,password)管理员信息关系:Stb_adm

5、in(aid,name,password)考试试卷信息关系：Stb_page(usid,pid,subject,snum,bnum,anum,pageDate)选择题信息关系：Stb_select(id,pid,subject,name,optionA,optionB,optionC,optionD)判断题信息关系：Stb_boolean(id,pid,subject,name,yes,no)简答题信息关系:Stb_answer(id,pid,subject,name)科目信息关系:Stb_subject(sid,subject)3.2 数据库物理设计暂无3.3 数据库分布暂无3.4 基表设计

6、在线考试系统数据库：3.4.1. tb_user: 考生信息表属性：编号Tid,姓名name,登录密码password,学号number,班级class,考试状态state字段名称数据类型长度主键描述Tidnumber10是主键标识unameVarchar250否学生姓名upasswordchar16否登录密码unonumber10否学号uclassVarchar250否班级ustatenumber1否考试状态Create table tb_user( Tid number(10) primary key, Uname varchar2(50), Upassword char(16), Uno

7、 number(10), Uclass varchar2(50), Ustate number(1) );3.4.2. tb_invigilate: 监考人员信息表属性：编号tid,姓名name,登录密码password字段名称数据类型长度主键描述tidnumber10是主键标识nameVarchar250否姓名passwordchar16否登录密码Create table tb_invigilate( Tid number(10) primary key, Name varchar2 (50), Password char(16) );3.4.3. tb_admin: 管理员信息表属性：编号

8、aid,姓名name,登录密码password字段名称数据类型长度主键描述aidnumber10是主键标识nameVarchar250否姓名passwordchar16否登录密码Create table tb_admin( Aid number(10) primary key, Name varchar2(50), Password char(16) );3.4.4. tb_page:考试试卷信息表属性：编号pid,科目subject, 选择题数量snum, 判断题数量bnum, 问答题数量anum，考试时间pageDate字段名称数据类型长度主键描述pidnumber10是主键标识subje

9、ctVarchar250否科目(外键)snumnumber2否选择题数量bnumnumber2否判断题数量anumnumber2否问答题数量pageDatedate/否考试时间tidnumber10是学生编号(外键) Create table tb_page( Pid number(10) primary key, Subject varchar2(50), Snum number(2), Bnum number(2), Anum number(2), pageDate date, tid number(10), constraint page_FK foreign key (subject)

10、 references tb_subject(subject), constraint page_FK2 foreign key(tid) references tb_user(tid) );3.4.5. tb_select:选择题信息表属性：编号id,题目name,选项A optionA,选项B optionB,选项C option C,选项D optionD,所属科目subject字段名称数据类型长度主键描述idnumber10是主键标识nameVarchar250否题目optionAVarchar2100否选项AoptionBVarchar2100否选项BoptionCVarchar21

11、00否选项CoptionDVarchar2100否选项DsubjectVarchar250否科目(外键)pidnumber10是试卷编号(外键) Create table tb_select( Id number(10) primary key, Name varchar2(50), optionA varchar2(100), optionB varchar2(100), optionC varchar2(100), optionD varchar2(100), subject varchar2(50), pid number(10), constraint select_FK foreig

12、n key(subject) references tb_subject(subject), constraint select_FK2 foreign key(pid) references tb_page(pid) );3.4.6. tb_boolean:判断题信息表 属性：编号id,题目name,对选项yes,错选项no ,所属科目subject字段名称数据类型长度主键描述idnumber10是主键标识nameVarchar250否题目subjectVarchar250否科目(外键)pidnumber10否试卷编号(外键) Create table tb_boolean( id numb

13、er(10) primary key, Name varchar2(50), Subject varchar2(50), Pid number(10), constraint boolean_FK foreign key(subject) references tb_subject(subject), constraint boolean_FK2 foreign key(pid) references tb_page(pid) );3.4.7. tb_answer:简答题信息表属性：编号id,题目name, 所属科目subject字段名称数据类型长度主键描述idnumber5是主键标识name

14、Varchar250否题目subjectVarchar250否科目(外键)pidnumber10否试卷编号(外键)Create table tb_answer( Id number(5) primary key, Name varchar2(50), Subject varchar2(50), Pid number(10), constraint answer_FK foreign key(subject) references tb_subject(subject), constraint answer_FK2 foreign key(pid) references tb_page(pid)

15、 );3.4.8. tb_subject:考试科目信息表 属性：编号sid,科目subject字段名称数据类型长度主键描述sidnumber10否科目自增编号subjectVarchar250 是主键标识 Create table tb_subject( Sid number(10) , Subject varchar2(50) primary key );/备注uid是关键字已被系统占用3.5 视图设计3.6 索引设计3.7 序列设计 设计目的：通过序列的设计，可以使得编号可以进行自增，从而达到设计目的。l Tb_sq 序列自动进行递增初值为：1递增为：1最大值：无Create sequen

16、ce tb_sqIncrement by 1Start with 1NomaxvalueNocycleCache 10;l Tb_invigilate_sq监考人员的 tid 自动进行递增Create sequence tb_invigilate_sqIncrement by 10Start with 10NomaxvalueNocycleCache 10;3.8 完整性设计请参阅本文档的基表设计的外键设置3.9 授权设计3.10 触发器设计l Tb_user_triggerCreate or replace trigger tb_user_triggerBefore insert on tb

17、_userFor each rowDeclareNext_no number;BeginSelect tb_sq.nextvalInto next_noFrom dual;:new.tid:=next_no;End;/-insert into tb_user (uname, upassword,uno, uclass, ustate)-values();l Tb_invigilate_triggerCreate or replace trigger tb_invigilate_triggerBefore insert on tb_invigilateFor each rowDeclareNex

18、t_no number;BeginSelect tb_sq.nextvalInto next_noFrom dual;:new.tid:=next_no;End;l Tb_admin_triggerCreate or replace trigger tb_admin_triggerBefore insert on tb_adminFor each rowDeclareNext_no number;Begin Select tb_sq.nextvalInto next_noFrom dual;:new.aid:=next_no;End;l Tb_page_triggerCreate or rep

19、lace trigger tb_page_triggerBefore insert on tb_pageFor each rowDeclareNext_no number;Begin Select tb_sq.nextvalInto next_noFrom dual;:new.pid:=next_no;End;l Tb_select_triggerCreate or replace trigger tb_select_triggerBefore insert on tb_selectFor each rowDeclareNext_no number;BeginSelect tb_sq.next

20、valInto next_noFrom dual;:new.id:=next_no;End;l Tb_boolean_triggerCreate or replace trigger tb_boolean_triggerBefore insert on tb_booleanFor each rowDeclareNext_no number;BeginSelect tb_sq.nextvalInto next_noFrom dual;:new.id:=next_no;End;l Tb_answer_triggerCreate or replace trigger tb_answer_trigge

21、rBefore insert on tb_answerFor each rowDeclareNext_no number;Begin Select tb_sq.nextvalInto next_noFrom dual;:new.id:=next_no;End;l Tb_subject_triggerCreate or replace trigger tb_subject_triggerBefore insert on tb_subjectFor each rowDeclare Next_no number;BeginSelect tb_sq.nextvalInto next_noFrom du

22、al;:new.sid:=next_no;End;3.11 存储过程设计3.11.1 CRUD中的CUD三个操作-向试卷表中插入信息(create操作)Create or replace procedure insert_tb_page(p_subject in tb_page.subject%type,p_snum in tb_page.snum%type,p_bnum in tb_page.bnum%type,p_anum in tb_page.anum%type,p_pageDate in tb_page.pageDate%type,-插入系统时间sysdatep_tid in tb_p

23、age.tid%type)asBeginInsert into tb_page(subject,snum,bnum,anum,pageDate,tid) values(p_subject,p_snum,p_bnum,p_anum,p_pageDate,p_tid);Exception When DUP_VAL_ON_INDEX thenDbms_output.put_line(subject primary key error!);When others thenDbms_output.put_line(异常);End insert_tb_page;-/执行过程: execute insert

24、_tb_page(,);-向判断题表中插入信息(create操作)Create or replace procedure insert_tb_boolean(b_name in tb_boolean.name%type,b_subject in tb_boolean.subject%type,b_pid in tb_boolean.pid%type) asbeginInsert into tb_boolean(name, subject,pid) values(b_name,b_subject,b_pid);End insert_tb_boolean;-/执行过程: execute inser

25、t_tb_boolean(,);-向简答题表中插入信息Create or replace procedure insert_tb_answer(a_name in tb_answer.name%type,a_subject in tb_answer.subject%type,a_pid in tb_answer.pid%type)as BeginInsert into tb_answer(name,subject,pid) values(a_name,a_subject,a_pid);End insert_tb_answer;-向科目表中插入信息Create or replace proced

26、ure insert_tb_subject(s_subject in tb_subject.subject%type)asBeginInsert into tb_subject(subject) values(s_subject);Exception When DUP_VAL_ON_INDEX thenDbms_output.put_line(subject primary key error!);When others thenDbms_output.put_line(异常);End insert_tb_subject;-向选择题表中插入信息Create or replace procedu

27、re insert_tb_select(s_name tb_select.name%type,s_optionA tb_select.optionA%type,s_optionB tb_select.optionB%type,s_optionC tb_select.optionC%type,s_optionD tb_select.optionD%type,s_subject tb_select.subject%type,s_pid tb_select.pid%type)asBegin Insert into tb_select(name, optionA, optionB, optionC,

28、optionD, subject, pid) values(s_name,s_optionA,s_optionB,s_optionC,s_optionD,s_subject,s_pid);End insert_tb_select;-管理员信息插入Create or replace procedure insert_tb_admin(a_name in tb_admin.name%type,a_password in tb_admin.password%type)asBeginInsert into tb_admin(name, password) values(a_name,a_passwor

29、d);End insert_tb_admin;3.12 数据复制设计暂无4 查询记录语句-随机函数Select randnum from(select distinct round(dbms_random.value(1,60) as randnum from dual Connect by rownum=100Order by randnum)where rownum=20;-随机查询20条选择题Select * from tb_select where id in(Select * from (select rownum rn from dual Connect by rownum=100

30、 order byDbms_random.value) whereRownum=20);-随机查询10条判断题记录Select * from tb_boolean where id in(Select * from (select rownum rn from dualConnect by rownum=100 order byDbms_random.value) whereRownum=10);-随机查询5条简答题记录Select * from tb_answer where id in(Select * from (select rownum rn from dualConnect by rownum=100 order by Dbms_random.value) where Rownum=5);5 词汇表Primary key: 主键foreign key:外键6 历史数据处理导出数据库:exp 用户名密码导入数据库：imp 用户名/密码Ms-dos专心-专注-专业