《数据库课程设计实验报告》
数据库实验报告(通用3篇)
数据库实验报告（通用3篇）数据库试验报告篇1一、实训时间：20_年5月13日至5月24日二、实训地点：三、实训目的与意义：1，这次实习可以使我们在课本上学到的学问用于实践增加了我对电脑技巧的一些认知。
2，通过这次实习也可以让我体验到上班族的生活为我将来毕业后找工作打下了基础。
3，并且这次实习可以非常好的关心我完成将来的毕业论文。
四、实训感悟：还依旧记得来的第一天对这里很茫然，不知道实习要做些什么。
然后经过老师的急躁讲解，熟悉了自己实习要做些什么，得到了许多心理熟悉，对许多问题都有了一些更深的了解。
同时，我熟识了河北玛世电子商务有限公司，总部位于国家命名的“中国丝网之乡”、“中国丝网产业基地”、中国丝网产销基地“、”中国丝网出口基地“—河北省安平县。
使我们队公司有了更进一步的了解实习，就是在实践中学习。
经过这半个月的实习训练，我了解到自己所学的如何在实践中运用。
当然学的更多的是如何在更新网站内容和添加商品，每天不厌其烦的更新添加，观察自己的胜利更多的是兴奋。
还有发布了一些关于公司产品的博客，比如新浪，网易。
而后又尝试在百度知道上提问与回答，在回答问题的过程中，通过网站搜寻相关内容来回答各种丝网问题，通过百度知道这个平台，我对公司又了更一步的了解。
经过半个月的实训我学到了许多之前没有学过没有接触到的东西，熟悉到自己的不足，需要更加努力，才能尽快的学会在社会上生活，敢于面对社会的压力，使自己可以在社会上成长进展。
数据库试验报告篇2由于平常接触的都是一些私人项目，这些项目大都是一些类库，其他人的沟通相对可以忽视不计，因此也就不考虑规范化的文档。
实际上从学习的经受来看，我们接触的学问体系都是属于比较老或比较传统的，与现在进展快速的IT行业相比许多状况已不再适用，尤其是当开源模式渐渐走近开发者后更是如此。
虽然这次是一个数据库课程设计，由于本人在选择项目的时候是本着对自己有实际应用价值的角度考虑的，所以其中也涉及到一些数据库以外的设计。
数据库课程设计实验报告
《数据库系统》课程设计题目：考勤管理系统专业：计算机科学与技术年级：大二班级：学号：姓名：指导老师：完成时间： 2017年6月8号目录一、实验目的 (2)二、实验平台 (2)三、实验内容 (2)四、实验要求 (2)五、实验步骤 (3)1.系统需求分析 (3)1.1系统功能分析 (3)1.2系统功能模块设计（划分） (3)1.3与其它系统的关系 (3)1.4数据流程图 (3)2.数据库设计 (3)2.1数据库需求分析 (4)2.2数据库概念结构设计 (4)2.3数据库逻辑结构设计 (4)2.4使用PowerDesigner16进行数据库的设计与建立 (6)2.5使用Axure RP 8 进行界面的设计 (7)3.各功能模块的设计与实现 (7)3.1功能说明 (7)3.2用户界面设计 (8)3.3各功能模块的实现 (13)4.系统实现 (14)4.1系统总体设计 (14)4.2ODBC连接方式的实现 (14)4.3登陆界面的实现 (17)4.4注册界面的实现 (18)4.5找回密码的实现 (19)4.6主界面的实现 (20)4.7上下班时间设置的实现 (20)4.8考勤修改的实现 (21)4.9出勤记录的实现 (22)4.10加班记录的实现 (23)4.11请假记录的实现 (24)4.12出差记录的实现 (24)4.13考勤统计和记录删除的实现 (25)六、实验心得 (26)七、部分代码展示 (1)一、实验目的数据库系统课程设计是为了配合数据库原理及应用开发而设置的，是计算机科学与技术、网络工程、信息安全、物联网工程、软件工程等专业集中实践的教学环节，是将关系数据库理论知识转化为解决实际问题能力的重要环节。
数据库系统课程设计目的在于加深对关系数据库理论知识的理解，通过使用具体的 DBMS，掌握一种实际的数据库管理系统并掌握其操作技术，熟练掌握使用数据库前端开发工具（如 VB、 C++、 Java、Delphi、 PowerBuilder等），进一步提高同学们运用数据库技术解决实际问题的能力。
数据库系统实验课实验报告
数据库系统实验课实验报告一、实验目的数据库系统实验课是一门重要的实践课程，旨在通过实际操作和实验，深入理解数据库系统的原理和应用，提高我们的数据库设计、管理和应用开发能力。
本次实验的具体目的包括：1、熟悉数据库管理系统（DBMS）的操作环境和基本命令。
2、掌握数据库的创建、表的设计、数据的插入、查询、更新和删除等基本操作。
3、学会使用 SQL 语句进行复杂的数据查询和数据处理。
4、理解数据库的完整性约束、索引和存储过程的概念及应用。
5、培养解决实际数据库问题的能力和团队协作精神。
二、实验环境本次实验使用的数据库管理系统是 MySQL 80，实验在 Windows 10 操作系统上进行。
使用的开发工具包括 MySQL Workbench 和命令行终端。
三、实验内容1、数据库的创建使用 CREATE DATABASE 语句创建了一个名为“student_management”的数据库，用于存储学生管理相关的数据。
2、表的设计在“student_management”数据库中，设计了以下几张表：“students”表，包含学生的学号（student_id）、姓名（student_name）、性别（gender）、年龄（age）等字段。
“courses”表，包含课程的课程号（course_id）、课程名称（course_name）、学分（credit）等字段。
“enrolls”表，用于记录学生选课的信息，包含学号（student_id）、课程号（course_id）、成绩（grade）等字段。
在设计表时，为每个字段选择了合适的数据类型，并设置了主键和外键约束，以保证数据的完整性和一致性。
3、数据的插入使用 INSERT INTO 语句向“students”、“courses”和“enrolls”表中插入了一些示例数据，以便进行后续的查询和操作。
4、数据的查询使用简单的 SELECT 语句查询了“students”表中的所有学生信息。
数据库的设计实验报告
一、实验目的1. 理解数据库设计的概念、过程和步骤。
2. 掌握数据库概念结构、逻辑结构和物理结构的设计方法。
3. 能够运用E-R图进行数据库概念结构设计。
4. 能够运用SQL语句进行数据库逻辑结构和物理结构设计。
二、实验环境1. 操作系统：Windows 102. 数据库管理系统：MySQL 5.73. 开发工具：MySQL Workbench三、实验内容1. 数据库概念结构设计2. 数据库逻辑结构设计3. 数据库物理结构设计四、实验步骤1. 数据库概念结构设计（1）分析需求，确定实体和属性以“图书管理系统”为例，确定实体和属性如下：实体：图书、读者、借阅信息属性：- 图书：书名、作者、出版社、ISBN、出版日期、分类号、库存数量- 读者：读者编号、姓名、性别、出生日期、联系电话、邮箱、住址- 借阅信息：借阅编号、图书编号、读者编号、借阅日期、归还日期、状态（2）绘制E-R图根据实体和属性，绘制E-R图如下：```图书(书名，作者，出版社，ISBN，出版日期，分类号，库存数量)读者(读者编号，姓名，性别，出生日期，联系电话，邮箱，住址)借阅信息(借阅编号，图书编号，读者编号，借阅日期，归还日期，状态) ```2. 数据库逻辑结构设计（1）确定关系模式根据E-R图，确定关系模式如下：- 图书(书名，作者，出版社，ISBN，出版日期，分类号，库存数量)- 读者(读者编号，姓名，性别，出生日期，联系电话，邮箱，住址)- 借阅信息(借阅编号，图书编号，读者编号，借阅日期，归还日期，状态)（2）编写SQL语句创建表```sqlCREATE TABLE 图书 (书名 VARCHAR(100),作者 VARCHAR(50),出版社 VARCHAR(50),ISBN VARCHAR(20),出版日期 DATE,分类号 VARCHAR(10),库存数量 INT);CREATE TABLE 读者 (读者编号 VARCHAR(10),姓名 VARCHAR(50),性别 CHAR(1),出生日期 DATE,联系电话 VARCHAR(20),邮箱 VARCHAR(50),住址 VARCHAR(100));CREATE TABLE 借阅信息 (借阅编号 VARCHAR(10),图书编号 VARCHAR(10),读者编号 VARCHAR(10),借阅日期 DATE,归还日期 DATE,状态 VARCHAR(10));```3. 数据库物理结构设计（1）确定索引根据需求，确定索引如下：- 图书表：ISBN、分类号- 读者表：读者编号- 借阅信息表：借阅编号、图书编号、读者编号（2）编写SQL语句创建索引```sqlCREATE INDEX idx_isbn ON 图书(ISBN);CREATE INDEX idx_分类号 ON 图书(分类号);CREATE INDEX idx_读者编号 ON 读者(读者编号);CREATE INDEX idx_借阅编号 ON 借阅信息(借阅编号);CREATE INDEX idx_图书编号 ON 借阅信息(图书编号);CREATE INDEX idx_读者编号 ON 借阅信息(读者编号);```五、实验结果与分析1. 通过实验，掌握了数据库设计的概念、过程和步骤。
数据库课程设计实验报告
SJTU-CS数据库课程设计实验报告姓名王亮谢明敏学号5040309458班级F0403016 F0403014 完成日期2007/7/5C O N T E N T1. Introduction (1)2. WaxBase Design (4)2.1 The Thought of Design (4)2.2 Project Part Introduce (5)2.2.1 The Paged File Component (5)2.2.1.1 Buffer_Data (6)2.2.1.2 PF_Manager (7)2.2.1.3 PF_FileHandle (8)2.2.1.4 PF_PageHandle (11)2.2.2 The Record Management Component (13)2.2.2.1 RM_Manager (13)2.2.2.2 RM_FileHandle (14)2.2.2.3 RM_FileScan (15)2.2.2.4 RM_Record (17)2.2.2.5 RM_RID (17)2.2.3 The Indexing Component (19)2.2.3.1 IX_Manager Class (19)2.2.3.2 IX_IndexHandle Class (20)2.2.3.3 IX_IndexScan Class (21)2.2.4 The System Management Component (23)2.2.4.1 SM_Manager Class (23)2.2.5 The Query Language Component (26)2.2.5.1 QL_Manager Class (26)2.3 The Algorithm Used In Program (29)2.3.1 LRU algorithm (29)2.3.2 Hashing Table (29)2.3.3 B+ Tree (29)3. Usage of WaxBase (32)3.1 Create a database (32)3.2 Destroy a database (32)3.3 Open a database (32)3.4 The commands we support in database: (32)3.4.1 DDL Commands (32)3.4.1.1 Create Table (32)3.4.1.2 Drop Table (32)3.4.1.3 Create Index (33)3.4.1.4 Drop Index (33)3.4.2 The RQL Select command (33)3.4.2.1 The syntax of the one data retrieval command in RQL (33)3.4.2.2 An alternative form of the Select command (33)3.4.3 The RQL Insert Command (33)3.4.4 The RQL Delete Command (34)4. Conclusions (35)5. Reference (36)1.IntroductionA database management system (DBMS) is computer software designed for the purpose of managing databases. Typical examples of DBMSs include Oracle, DB2, Microsoft Access, Microsoft SQL Server, Postgres, MySQL and FileMaker. DBMSs are typically used by Database administrators in the creation of Database systems.A DBMS is a complex set of software programs that controls the organization, storage and retrieval of data in a database. A DBMS includes:1. A modeling language to define the schema(relational model) of each database hosted in theDBMS, according to the DBMS data model.●The three most common organizations are the hierarchical, network and relational models. Adatabase management system may provide one, two or all three methods. Inverted lists andother methods are also used. The most suitable structure depends on the application and onthe transaction rate and the number of inquiries that will be made. The dominant model inuse today is the ad hoc one embedded in SQL, a corruption of the relational model byviolating several of its fundamental principles. Many DBMSs also support the OpenDatabase Connectivity API that supports a standard way for programmers to access theDBMS.2.Data structures (fields, records and files) optimized to deal with very large amounts of data storedon a permanent data storage device (which implies very slow access compared to volatile main memory).3. A database query language and report writer to allow users to interactively interrogate thedatabase, analyze its data and update it according to the users privileges on data.●It also controls the security of the database.●Data security prevents unauthorized users from viewing or updating the database. Usingpasswords, users are allowed access to the entire database or subsets of it called subschemas.For example, an employee database can contain all the data about an individual employee,but one group of users may be authorized to view only payroll data, while others are allowedaccess to only work history and medical data.●If the DBMS provides a way to interactively enter and update the database, as well asinterrogate it, this capability allows for managing personal databases. However, it may notleave an audit trail of actions or provide the kinds of controls necessary in a multi-userorganization. These controls are only available when a set of application programs arecustomized for each data entry and updating function.4. A transaction mechanism, that ideally would guarantee the ACID properties, in order to ensuredata integrity, despite concurrent user accesses (concurrency control), and faults (fault tolerance).●It also maintains the integrity of the data in the database.第1页The DBMS can maintain the integrity of the database by not allowing more than one user to update the same record at the same time. The DBMS can help prevent duplicate records viaunique index constraints; for example, no two customers with the same customer numbers(key fields) can be entered into the database. See ACID properties for more information(Redundancy avoidance).The components of a DBMS:The DBMS accepts requests for data from the application program and instructs the operating system to transfer the appropriate data.When a DBMS is used, information systems can be changed much more easily as the organization's information requirements change. New categories of data can be added to the database without disruption to the existing system.Organizations may use one kind of DBMS for daily transaction processing and then move the detail onto another computer that uses another DBMS better suited for random inquiries and analysis. Overall systems design decisions are performed by data administrators and systems analysts. Detailed database design is performed by database administrators.Database servers are specially designed computers that hold the actual databases and run only the DBMS and related software. Database servers are usually multiprocessor computers, with RAID disk arrays第2页used for stable storage. Connected to one or more servers via a high-speed channel, hardware database accelerators are also used in large volume transaction processing environments.DBMS's are found at the heart of most database applications. Sometimes DBMSs are built around a private multitasking kernel with built-in networking support although nowadays these functions are left to the operating system.Features and Abilities of DBMS: One can characterize a DBMS as an "attribute management system" where attributes are small chunks of information that describe something. For example, "color" is an attribute of a car. The value of the attribute may be a color such as "red", "blue", "silver", etc. Lately databases have been modified to accept large or unstructured (pre-digested or pre-categorized) information as well, such as images and text documents. However, the main focus is still on descriptive attributes.DBMS roll together frequently-needed services or features of attribute management. This allows one to get powerful functionality "out of the box" rather than program each from scratch or add and integrate them incrementally.第3页2.WaxBase Design2.1The Thought of DesignIn general, a Database managerment system will include many components, but because of the short of peoples and time, our WaxBase will include these components:Legend:●PF: Paged File●RM: Record Management●IX: Indexing●SM: System Management (DDL, utilities)●QL: Query Language●EX: Extension第4页2.2 Project Part Introduce2.2.1 The Paged File ComponentThe paged file component is the "bottom" component of the WaxBase system. This component provides facilities for higher-level client components to perform file I/O in terms of pages. In the PF component, methods are provided to create, destroy, open, and close paged files, to scan through the pages of a given file, to read a specific page of a given file, to add and delete pages of a given file, and to obtain and release pages for scratch use.The name of each class in paged file component begins with the prefix PF. Each method in the PF component except constructors and destructors returns an integer code; the same will be true of all of the methods you will see. A return code of 0 indicates normal completion. A nonzero return code indicates that an exception condition or error has occurred. Positive nonzero return codes indicate non-error exception conditions (such as reaching the end of a file) or errors from which the system can recover or exit gracefully (such as trying to close an unopened file). Negative nonzero return codes indicate errors from which the system cannot recover.Accessing data on a page of a file requires first reading the page into a buffer pool in main memory, then manipulating (reading or writing) its data there. While a page is in memory and its data is available for manipulation, the page is said to be "pinned" in the buffer pool. A pinned page remains in the buffer pool until it is explicitly "unpinned." A client unpins a page when it is done manipulating the data on that page. Unpinning a page does not necessarily cause the page to be removed from the buffer -- an unpinned page is kept in memory as long as its space in the buffer pool is not needed.If the PF component needs to read a new page into memory and there are no free spaces left in the buffer pool, then the PF component will choose an unpinned page to remove from the buffer pool and will reuse its space. The PF component uses a Least-Recently-Used (LRU) page replacement policy. When a page is removed from the buffer pool, it is copied back to the file on disk if and only if the page is marked as "dirty." Dirty pages are not written to disk automatically until they are removed from the buffer. However, a PF client can always send an explicit request to force (i.e., write to disk) the contents of a particular page, or to force all dirty pages of a file, without removing those pages from the buffer.It is important not to leave pages pinned in memory unnecessarily. The PF component clients that you will implement can be designed so that each operation assumes none of the pages it needs are in the buffer pool: A client fetches the pages it needs, performs the appropriate actions on them, and then unpins them, even if it thinks a certain page may be needed again in the near future. (If the page is used again soon then it will probably still be in the buffer pool anyway.) The PF component does allow the same page to be pinned more than once, without unpinning it in between. In this case, the page won't actually be unpinned until the number of unpin operations matches the number of pin operations. It is very important that each time you第5页fetch and pin a page, you don't forget to unpin it when you're done. If you fail to unpin pages, the buffer pool will slowly fill up until you can no longer fetch any pages at all (at which point the PF component will return a negative code).The description of classes in the PF component is in the below:2.2.1.1 Buffer_DataThe Buffer_Data class handles the buffer pool action. We use an array of char to store the buffer. The whole number of block is 40. Meanwhile, we use a hash table to save which page saved in our buffer now. In buffer, we use a chain to implement the LRU algothrim. If the block is pined in the buffer, it will not in the chain. Every time if we want to use a block in buffer to save the page, we will use the LRU place to save the page.Int getderty (int num)This method is to get if the num block in buffer is derty.Int getfname (int num)This method is to get the filename of the num block in buffer.Int getdata (int num)This method is to get the data of the num block in buffer.Int delMRU ()This method is to delete the data of the most recently used block in buffer.第6页Int addLRU (int num)This method is to add the num block in buffer to the LRU place.Int addLRU (int num)This method is to add the num block in buffer to the MRU place.Int DelChain (int num)This method is to delete the num block in buffer from the chain.Int WriteBack (int num)This method is to write back the num block in buffer from the buffer to disk, but not delete from the buffer.Int WriteBackWithDel (int num)This method is to write back the num block in buffer from the buffer to disk, and delete from the buffer.Int addMap (string str, int num)This method is to add the map of str to num in the hash table.Int delMap (string str, int num)This method is to delete the map from the hash table.Int delMap (int num)This method is to get the map from the hash table.2.2.1.2PF_ManagerThe PF_Manager class handles the creation, deletion, opening, and closing of paged files, along with the allocation and disposal of scratch pages. Your program should create exactly one instance of this class, and all requests for PF component file management should be directed to that instance. Below, the public methods of the class declaration are shown first, followed by descriptions of the methods. The first two methods in the class declaration are the constructor and destructor methods for the class; they are not explained further. Each method except the constructor and destructor methods returns a value of type RC (for "return code" -- actually an integer). A return code of 0 indicates normal completion. A nonzero return code indicates that an exception condition or error has occurred.RC CreateFile (const char *fileName)第7页This method creates a paged file called fileName. The file should not already exist.RC DestroyFile (const char *fileName)This method destroys the paged file whose name is fileName. The file should exist.RC OpenFile (const char *fileName, PF_FileHandle &fileHandle)This method opens the paged file whose name is fileName. The file must already exist and it must have been created using the CreateFile method. If the method is successful, the fileHandle object whose address is passed as a parameter becomes a "handle" for the open file. The file handle is used to manipulate the pages of the file (see the PF_FileHandle class description below).RC CloseFile (PF_FileHandle &fileHandle)This method closes the open file instance referred to by fileHandle. The file must have been opened using the OpenFile method. All of the file's pages are flushed from the buffer pool when the file is closed. It is a (positive) error to attempt to close a file when any of its pages are still pinned in the buffer pool.RC AllocateBlock (char *&buffer)This method allocates a "scratch" memory page (block) in the buffer pool and sets buffer to point to it. The scratch page is automatically pinned in the buffer pool.RC DisposeBlock (char *buffer)This method disposes of the scratch page in the buffer pool pointed to by buffer, which must have been allocated previously by PF_Manager::AllocateBlock. Similar to pinning and unpinning, you must call PF_Manager::DisposeBlock for each buffer block obtained by calling PF_Manager::AllocateBlock; otherwise you will lose pages in the buffer pool permanently.2.2.1.3 PF_FileHandleThe PF_FileHandle class provides access to the pages of an open file. To access the pages of a file, a client first creates an instance of this class and passes it to the PF_Manager::OpenFile method described above. As before, the public methods of the class declaration are shown first, followed by descriptions of the methods. The first two methods in the class declaration are the constructor and destructor methods and are not explained further.第8页PF_FileHandle (const PF_FileHandle &fileHandle)This method is the copy constructor, called if a new file handle object is created from an existing one. When a new file handle object is created from a file handle object that refers to an open file instance, the file is not opened an additional time. Instead, both file handle objects refer to the same open file instance. It is sufficient to call PF_Manager::CloseFile with one of the file handle objects to close the file.PF_FileHandle& operator= (const PF_FileHandle &fileHandle)This method overloads the = operator when it is used to assign one file handle object to another. It is not a good idea to assign one file handle object to another if the file handle object on the left-hand side of the = already refers to an open file. As with the copy constructor, if the file handle object on the right-hand side of the = refers to an open file instance, the file is not opened an additional time. Instead, both file handle objects refer to the same open file instance, and it is sufficient to call PF_Manager::CloseFile with one of the file handle objects to close the file.RC GetFirstPage (PF_PageHandle &pageHandle)For this and the following methods, it is a (positive) error if the PF_FileHandle object for which the method is called does not refer to an open file. This method reads the first page of the file into the buffer pool in memory. If the page fetch is successful, the pageHandle object becomes a handle for the page. The page handle is used to access the page's contents (see the PF_PageHandle class description below). The page read is automatically pinned in the buffer pool and remains pinned until it is explicitly unpinned by第9页calling the UnpinPage method (below). This method returns the positive code PF_EOF if end-of-file is reached (meaning there is no first page).RC GetLastPage (PF_PageHandle &pageHandle)This method reads the last page of the file into the buffer pool in memory. If the page fetch is successful, the pageHandle object becomes a handle for the page. The page read is automatically pinned in the buffer pool and remains pinned until it is explicitly unpinned by calling the UnpinPage method (below). This method returns the positive code PF_EOF if end-of-file is reached (meaning there is no last page).RC GetNextPage (PageNum current, PF_PageHandle &pageHandle)This method reads into memory the next valid page after the page whose number is current. If the page fetch is successful, pageHandle becomes a handle for the page. The page read is pinned in the buffer pool until it is unpinned by calling the UnpinPage method. This method returns PF_EOF if end-of-file is reached (meaning there is no next page). Note that it is not an error if current does not correspond to a valid page (e.g., if the page numbered current has been disposed of).RC GetPreviousPage (PageNum current, PF_PageHandle &pageHandle)This method reads into memory the valid page previous to the page whose number is current. If the page fetch is successful, pageHandle becomes a handle for the page. The page read is pinned in the buffer pool until it is unpinned by calling the UnpinPage method. This method returns PF_EOF if end-of-file is reached (meaning there is no previous page). Note that it is not an error if current does not correspond to a valid page (e.g., if the page numbered current has been disposed of).RC GetThisPage (PageNum pageNum, PF_PageHandle &pageHandle)This method reads into memory the page specified by pageNum. If the page fetch is successful, pageHandle becomes a handle for the page. Parameter pageNum must be a valid page number. As usual, the page read is pinned in the buffer pool until it is explicitly unpinned.RC AllocatePage (PF_PageHandle &pageHandle)This method allocates a new page in the file, reads the new page into memory, and pins the new page in the buffer pool. If successful, pageHandle becomes a handle for the new page.RC DisposePage (PageNum pageNum)This method disposes of the page specified by pageNum. After this method is executed, if you scan over the pages of the file, the page numbered pageNum will no longer appear. It is a (positive) error to attempt to dispose of a page that is pinned in the buffer pool.RC MarkDirty (PageNum pageNum)This method marks the page specified by pageNum as "dirty," indicating that the contents of the page have been or will be modified. The page must be pinned in the buffer pool. A page marked as dirty is written back to disk when the page is removed from the buffer pool. (Pages not marked as dirty are never written back to disk.)RC UnpinPage (PageNum pageNum)第10页This method tells the PF component that the page specified by pageNum is no longer needed in memory.RC ForcePages (PageNum pageNum = ALL_PAGES)This method copies the contents of the page specified by pageNum from the buffer pool to disk if the page is in the buffer pool and is marked as dirty. The page remains in the buffer pool but is no longer marked as dirty. If no specific page number is provided (i.e., pageNum = ALL_PAGES), then all dirty pages of this file that are in the buffer pool are copied to disk and are no longer marked as dirty. Note that page contents are copied to disk whether or not a page is pinned.2.2.1.4 PF_PageHandleThe PF_PageHandle class provides access to the contents of a given page. To access the contents of a page, a client first creates an instance of this class and passes it to one of the PF_FileHandle methods described above.PF_PageHandle (const PF_PageHandle &pageHandle)This method is the copy constructor. When a new page handle object is created from a page handle object that refers to a pinned page in the buffer pool, the page is not pinned a second time.PF_PageHandle& operator= (const PF_PageHandle &pageHandle)This method overloads the = operator when it is used to assign one page handle object to another. As with the copy constructor, if the page handle object on the right-hand side of the = refers to a pinned page, the page is not pinned a second time.RC GetData (char *&pData) constThis method provides access to the actual contents of a page. The PF_PageHandle object for which this method is called must refer to a page that is pinned in the buffer pool. If the method is successful, pData is set to point to the contents of the page in the buffer pool.RC GetPageNum (PageNum &pageNum) const第11页This method sets pageNum to the number of the page referred to by the PF_PageHandle object for which this method is called. The page handle object must refer to a page that is pinned in the buffer pool.第12页2.2.2 The Record Management ComponentThe RM component provides classes and methods for managing files of unordered records. All class names, return codes, constants, etc. in this component should begin with the prefix RM. The RM component is a client to the PF component: RM methods will make calls to the PF methods we have provided.2.2.2.1 RM_ManagerThe RM_Manager class handles the creation, deletion, opening, and closing of files of records in the RM component.RC CreateFile (const char *fileName, int recordSize)This method will call PF_Manager::CreateFile to create a paged file called fileName. The records in this file will all have size recordSize. This method will initialize the file by storing appropriate information in the header page. Although recordSize will usually be much smaller than the size of a page, you should compare recordSize with PF_PAGE_SIZE and return a nonzero code if recordSize is too large for your RM component to handle.RC DestroyFile (const char *fileName)This method should destroy the file whose name is fileName by calling PF_Manager::DestroyFile.RC OpenFile (const char *fileName, RM_FileHandle &fileHandle)This method should open the file called fileName by calling PF_Manager::OpenFile. If the method is successful, the fileHandle object should become a "handle" for the open RM component file. As in the PF component, it should not be an error if a client opens the same RM file more than once, using a different fileHandle object each time. Each call to the OpenFile method should create a new instance of the open file. You may assume if a file has more than one opened instance then each instance of the open file may be read but will not be modified. If a file is modified while opened more than once, you need not guarantee the integrity of the file or the RM component. You may also assume that DestroyFile will never be called on an open file.RC CloseFile (RM_FileHandle &fileHandle)This method should close the open file instance referred to by fileHandle by calling PF_Manager:: CloseFile.第13页2.2.2.2 RM_FileHandleThe RM_FileHandle class is used to manipulate the records in an open RM component file. To manipulate the records in a file, a client first creates an instance of this class and passes it to the RM_Manager::OpenFile method described above. Descriptions of the constructor and destructor methods are not included for this class.RC GetRec (RID &rid, RM_Record &rec)For this and the following methods, it should be a (positive) error if the RM_FileHandle object for which the method is called does not refer to an open file. This method should retrieve the record with identifier rid from the file. It should be a (positive) error if rid does not identify an existing record in the file. If the method succeeds, rec should contain a copy of the specified record along with its record identifier (see the RM_Record class description below).RC InsertRec (char *pData, RID &rid)This method should insert the data pointed to by pData as a new record in the file. If successful, the return parameter &rid should point to the record identifier of the newly inserted record.RC DeleteRec (RID &rid)This method should delete the record with identifier rid from the file. If the page containing the record becomes empty after the deletion, you can choose either to dispose of the page (by calling PF_Manager::DisposePage) or keep the page in the file for use in the future, whichever you feel will be more efficient and/or convenient.RC UpdateRec (RM_Record &rec)This method should update the contents of the record in the file that is associated with rec (see the RM_Record class description below). This method should replace the existing contents of the record in the file with the current contents of rec.第14页RC ForcePages (PageNum pageNum = ALL_PAGES) constThis method should call the corresponding method PF_FileHandle::ForcePages in order to copy the contents of one or all dirty pages of the file from the buffer pool to disk.2.2.2.3 RM_FileScanThe RM_FileScan class provides clients the capability to perform scans over the records of an RM component file, where a scan may be based on a specified condition. As usual, the constructor and destructor methods are not described.RC OpenScan (const RM_FileHandle &fileHandle, AttrType attrType, int attrLength, int attrOffset, CompOp compOp, void *value, ClientHint pinHint = NO_HINT)This method should initialize a scan over the records in the open file referred to by parameter fileHandle. During the scan, only those records whose specified attribute satisfies the specified condition (a comparison with a value) should be retrieved. If value is a null pointer, then there is no condition and all records are retrieved during the scan. If value is not a null pointer, then value points to the value that attributes are to be compared with.Parameters attrType and attrLength indicate the type and length of the attribute being compared: either a 4-byte integer, a 4-byte floating point number, or a character string with a length between 1 and MAXSTRINGLEN bytes. (MAXSTRINGLEN = 255 is defined in waxbase.h.) Type AttrType is defined in第15页waxbase.h as follows: INT for integer, FLOAT for floating point number, and STRING for character string. You will need to cast the value into the appropriate type for the attribute (or, in the case of an integer or float, copy it into a separate variable to avoid alignment problems). If a character string has length n, then the attribute and the value will each be exactly n bytes long. They will not be <= n bytes, i.e., no "padding" is required, and they are not null-terminated. Parameter attrOffset indicates where the attribute is found within the contents of each record. Parameter compOp indicates the way that the record's attribute value should be compared with the value parameter. The different values for compOp are defined in waxbase.h as follows:file scan can suggest a specific page-pinning strategy for the RM component to use during the file scan, to achieve maximum efficiency. Type ClientHint is defined in waxbase.h, and you will need to define constants in addition to NO_HINT if you plan to use it. You are free to implement only one page-pinning strategy and ignore the pinHint parameter, or you may implement more than one strategy based on pinHint values now, or you may implement one strategy now and consider adding new strategies later when you implement clients of the RM component. Please note that using pinHint is optional, and only default value NO_HINT will be passed to OpenScan in the TA's test suite.RC GetNextRec (RM_Record &rec)This method should retrieve a copy of the next record in the file scan that satisfies the scan condition. If this method succeeds, rec should contain a copy of the record along with its record identifier. This method should return RM_EOF (which you should define) if there are no records left satisfying the scan condition. You may assume that RM component clients will not close the corresponding open file instance while a scan is underway.RC CloseScan ()This method should terminate the file scan.第16页。
数据库课程设计实验报告
数据库课程设计·学生成绩管理系统一﹑系统定义......................................二﹑需求分析......................................（一）系统综合需求（二）功能需求（三）数据需求1.数据流图：2.数据字典三﹑系统设计......................................（一）逻辑结构设计（二）概念结构设计E-R图：四﹑详细设计.......................................（一）开发平台及工具（二）数据库分析五﹑源程序清单..................................... 六﹑设计心得.......................................一﹑系统定义：随着学校向全国及至世界范围的持续扩张，学生人数的增加，对于学生的信息管理也越来越复杂，要求也越来越高，因此需要一个全面、详细的信息管理系统，以便完成对学生信息的管理。
无纸化的环境是技术时代的一个梦想，也是许多学校和公司越来越意识到的一个真实世界。
以前是由学生档案和公告栏来提供各种信息及通告新的变化，而现在这个繁杂的工作已被网站和内部计算机网络所取代。
使得学生信息的管理更方便、安全。
根据调查得知，现在广大学生进行信息提交的主要方式是基于文件、表格等纸介质的手工处理，学生信息管理部门信息处理工作量大，容易出错，且管理方面因人而异。
然而学校网上学生信息管理系统应该覆盖各个所需功能，使各级管理人员和广大教职工在信息系统的辅助下进行工作，提高管理的整体水平。
使得学生信息管理更方便。
学生成绩管理系统就应运而生了。
二﹑需求分析：（一）该学生成绩管理系统，实现简单的密码修改、成绩查询、课程查询、学生查询等操作，并能实现简单的数据统计。
此系统主要完成用户密码登录、用户密码的修改、成绩查询、课程查询、学生查询、具体成绩查询等基本功能。
数据库实验报告（实验六）（合集五篇）
数据库实验报告（实验六）（合集五篇）第一篇：数据库实验报告(实验六)实验六SQL语言数据查询语言DQL一、实验内容了解SQL语言的SELECT语句对数据的查询，学会在Navicat for MySQL中用SELECT语句对表中的数据进行简单查询、连接查询、嵌套查询和组合查询。
启动Navicat for MySQL，用SELECT语句进行简单查询操作，具体实验步骤如下：（实验步骤里的内容）1启动Navicat for MySQL，登录到本地数据库服务器后，连接到test数据库上。
用Create Table建立Student表、Course表和Choose表：2.用INSERT语句分别向Student表中插入3个元组、Course表中插入3个元组、Choose表中插入7个元组：3.用SELECT语句，查询计算机学院学生的学号和姓名。
4.用SELECT语句的between…and…表示查询条件，查询年龄在20~23岁的学生信息。
5.用SELECT语句的COUNT()聚集函数，统计Student表中学生总人数。
6.分别用SELECT语句的max()、min()、sum()、avg()四个聚集函数，计算Choose表中C1课程的最高分、最低分、总分、平均分。
7.用SELECT语句对空值(NULL)的判断条件，查询Course表中先修课称编号为空值的课程编号和课程名称。
8.用SELECT语句的连接查询，查询学生的学号、姓名、选修的课程名及成绩。
9.用SELECT的存在量词EXISTS，查询与“张三”在同一个学院学习的学生信息。
10.用SELECT语句的嵌套查询，查询选修C1课程的成绩低于“张三”的学生的学号和成绩。
11.用SELECT语句的组合查询(UNION)，查询选修了C1课程或者选修了C3课程的学生学号。
12.用SELECT语句的组合查询(UNION)与DISTINCT短语，查询选修了C1课程或者选修了C3课程的学生学号，并取消重复的数据。
数据库课程设计实验报告
数据库课程设计实验报告导语：通过本课程设计，培养学生具有C/S模式的数据库应用软件系统的设计和开发能力。
以下是小编为大家整理的数据库课程设计实验报告，欢迎大家阅读与借鉴！数据库课程设计实验报告有关于数据库实验的心得体会，总的来说，受益匪浅。
在这些天中，我们学到了很多东西，包括建表，导入数据，查询，插入。
最重要的是我们有机会用电脑自己进行实践，没接触的时候总是觉得它比较深奥或是不可接近的新型语言，尽管自己对C语言非常感兴趣，但还是有些心理上的陌生感。
学习数据库就和我们平时的其它科目学习一样感觉它有永无止境的知识，数据库是我在高中时候听过，到了大学渐渐了解了些，但就其原理性的内容还不知道，也就是根本就不清楚什么是数据库，只是知道一个所谓的中国字典里的名词。
我认识它是从我接触实验运作开始的，刚开始就是建立数据库，两种验证模式，没什么东西但还觉得不错。
进而就是操作语言了，紧接着就是触发器的使用，进而对数据库高级的使用，等等。
开始知道数据库的时候想学，不知道从何而起，不懂的话怎么问，从什么地方学起。
后来到大三开学后有数据库原理必修课，非常高兴。
当时感觉SQL Sever数据库管理既然是单独一门课程一定会讲的比较细，也能学到真正实用的内容。
学了这门课以后发现和我想的基本是一样的，老师对学生也比较和蔼可亲，对我们要求也不是很紧。
让每个人都觉得轻轻松松就能把这门课程学完，没有多么紧张的作业，也没有太苛刻的要求。
当老师在最后说这个课程结束了，回顾一下以前老师给我们讲过的东西，真的有很多是我们应该去注意的。
学习完SQL Sever数据库后感觉可分两大块，一块是开发，一块是管理。
开发主要是写写存储过程、触发器什么的，还有就是用Oracle的Develop工具做form。
有点类似于程序员。
开发还需要有较强的逻辑思维和创造能力，自己没有真正做过，但感觉应该会比较辛苦，是青春饭；管理则需要对SQL Sever 数据库的原理有深刻的认识，有全局操纵的能力和紧密的思维，责任较大，因为一个小的失误就会弄掉整个数据库，相对前者来说，后者更看重经验。
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b.数据库的安全性、完整性控制：在建立之初便设置了密码
c.数据库性能的监督、分析和改造
Cpu：在空闲时cpu使用率依然很低，说明cpu资源充足
网络：因为SQL数据并不多，所以网络并不会因此变慢
d.数据库的重组织与重构造
随着数据库的不断运行，记录也会随之不停改变，使得数据库的物理存ቤተ መጻሕፍቲ ባይዱ情况变坏，降低了数据的存取效率，使数据库性能下降，因此要不断地重新安排存储位置，回收垃圾等操作，以此提高系统性能。
7应用程序开发
8遇到的问题及解决方法
更改了SqlServer的驱动
将driver更改为com.microsoft.sqlserver.jdbc.SQLServerDriver
四、课程设计心得
我们在选定课题的时候，看到了音乐播放器觉得很有挑战性，因为平时也经常听音乐，所以就想做一个贴近生活的音乐播放器。
歌手（姓名，简介，单曲，专辑，MV，歌手照片，粉丝数）
歌曲信息表（发布年份，专辑，热度指数，标签，词作者，曲作者）
用户个人信息（头像，姓名，账号，关注，等级，收藏，生日，地区，乐龄，听歌时长）
热度指数（分享量，下载量，播放量，收藏量，评论量，搜索量）
歌单（歌单名，制作人，收藏量，歌曲列表）
歌曲（歌名，歌手，专辑，长度，歌词，封面，信息表，评论）
迎合客户的根本需求，可实现听歌、评论、收藏等基本功能，在此基础上可增加好友互动、分享歌曲等社交活动。
1.3系统设计概要
本系统主要是设计一个音乐播放器，包括音乐播放功能、用户自定义歌单功能、歌曲搜索功能、热门榜单推荐功能等。
1.4软件处理对象
评论（用户名，评论内容，点赞数，回复内容）
专辑（歌手，发行时间，歌曲列表，唱片公司，专辑名，歌手简介，封面图片）
1.5系统可行性分析
使用场景：主要运用于手机上，计算机不适用于本音乐播放器
与现有播放器相比的优越性：操作界面简单明了，占用空间小。
费用支出：小组制作的软件，耗费极低。
人员和设备：三人一小组，利用电脑开发音乐播放器。
1.6系统设计目标及意义
设计出一个简洁、方便的音乐播放器，占用空间不大，能满足用户的基本需求。
1.7系统业务流程及具体功能
1.8数据流程图
1.9系统的数据字典
歌单=自制歌单+系统歌单
用户=歌手+听众
评论=[精彩评论|全部评论]
热度指数=[分享量|下载量|播放量|收藏量|评论量|搜索量|购买量]
歌曲信息=年份+节奏+热度指数+标签+词曲作者
歌手信息=姓名+简介+单曲+专辑+MV+照片+粉丝+编号
《数据库课程设计》
设计题目：音乐播放器
专业:物联网工程
引言
1、人员分配
原雅丽：ER图绘制，编码和数据库的连接，运行代码的编写和调试。
肖凌云：创建数据库，对设计进行可行性分析、需求分析，绘制系统流程图
孟佳：绘制功能界面，绘制数据流图，数据字典，逻辑结构设计和部分ER图绘制
二、课程设计目的和要求
目的：设计一个音乐播放器
专辑信息=歌手+发行时间+歌曲+唱片公司+专辑名+简介+封面
2概念结构设计阶段
用户：
歌曲：
歌手：
专辑：
歌单：
评论：
歌曲信息表：
热度指数：
Er图：
3逻辑结构设计阶段
4物理结构设计阶段
歌单表：
歌曲表：
热度表：
歌曲信息：
5数据库实施
创建歌单表：
创建歌曲表：
创建热度表
创建歌曲总表：
建立表间关系：
6数据库的运行和维护
我们先是观察了酷狗音乐的网页界面，决定了我们想要实现的部分功能，同时设想了到一些需要构建的数据库。
我们先设计了业务流程和数据流程，将每个界面设计出来，和每个界面之间的关系。随后决定了实体、属性和他们之间的联系，并画出了E-R图。然后构建了逻辑结构，决定实现所需的环境和他们之间的连接方法。
我们先使用SQLServer构建了后台数据库，然后用JAVA进行前端设计。
我们将精力放在了前面的设计部分，后面的实现有一定的困难，前端设计界面较多，实现较为复杂，连接数据库时也出现了问题。
要求：能够满足大部分用户对歌曲进行操作的需求，例如收藏，下载，建立歌单，关注歌手，搜索音乐等。
三、课程设计过程
1需求分析阶段
1.1应用背景
在快生活节奏的今天，人们生活、工作的压力日益增加，迫切需要一个方便、快捷的放松方式，例如听音乐，看MV等，音乐播放器也就应运而生，展现出了其巨大的潜在市场价值。
1.2需求分析目标