Fermé

Conceptual and Logical Design

Conceptual and Logical Design

Steps:

(a) Draw an ER diagram according to the list of requirements given below.

(b) Convert your ER diagram to a relational database schema.

Deliverables: ER diagram and relational schema. Hand-written scanned documents will NOT be accepted, please use the drawing tools(Dia Diagram Editor).

Design a code-versioning system (CVS) database for a software development company based on the following requirements.

• Every user has a name, multiple e-mails and a unique username.

• Every software project developed by the company is referred to with a unique name and

version combination. Together with this information, the following data of a project

are stored:

(a) a textual description of the project and,

(b) the root directory (that contains documents related with the project).

• Documents are identified by their absolute path.

• Every document has exactly one owner, who is a user. Document ownership is established upon document creation and the timestamp of this event is kept in the database

explicitly. Ownership can later be transferred but the “date created” property of a

document cannot be modified.

• The database does not keep any history of document ownership. Only the current

owner information is maintained.

• Every project contains at least one document. However some documents may not be

contained in any project, such as personal files.

• Users contribute to multiple projects. For each user working on a project, the user’s

contribution start-date and end-date are stored. Assume that once a user stops working

for a project, he/she cannot work for the same project again. Therefore, there is only

one start-date for each user working on each project.

• The database also keeps the duration of time each user worked on a project. Notice

that this value can b e calculated easily based on the start-date and end-date fields

described above.

• Every project is coordinated by a user. A co ordinator may co ordinate multiple projects

concurrently.

• The most important part of the database contains access logs of users. Whenever a

user accesses a document, an access log entry is created by the system.

• Each access log entry contains the following information:

(a) type of access: either ‘R’ for read, or ‘W’ for write, ‘RW’ for read and write,

(b) event timestamp: the date and time when the user accessed the document, and,

(c) a field called “difference”.

• The field “difference” is textual (i.e., is a string) and contains all the details needed

for undoing an edit operation by a user. Think of this field as an incremental backup

of the document.

• Over time, it is natural that a user will have multiple access log entries for a document.

• However, a user cannot have two access log entries on the same document with the

same timestamp.

Do not assign auto-increment type of keys to any of the entities.

Compétences : Développement de bases de données, Programmation de bases de données

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