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Database Application Assignment FIS 1311; Nov. 28, 2005 Outline: Assignment Components • • • • • • • Use Cases Entity Relationship Diagram MS Database with data Query Query results/output XML Record Illustrate with “bulletin board” example Use Cases • Note: Include final version of scenario in your design document. • Each group member should create: – One diagram with at least one case (one or more “ovals” in the diagram) – Corresponding statements of pre-conditions, flows and post-conditions • These should be combined into a single coherent, consistent document with a common list of use case actors Use Cases, con’t • Label each set of use case diagrams, conditions, etc. with the name of their creator • Ensure each of the queries/statements is expressed in some way in the use cases in your group Entity Relationship Diagram • “for high-level graphical descriptions of of conceptual data models --especially for relational database systems.” • Entity=table, attributes=fields, • multi-field attributes=table with values (and ID’s, definitions) • Relationships=relationships (1-1, 1many) MS Database with Data • Screen capture(s) and database file • Screen capture of the tables with sample data • Screen capture of their relationship • “ALT + PRNT Screen” • “Grab” SQL Query • One per person, based on one of the questions/statements provided in the scenario description • Will be a conditional select statement, usually with a join component; sometimes with a sub-query and/or a “miscellaneous” clause Query Results • Display the content of the fields selected from the tables. • You can do this by inputting a query into MS Access (graphically or using SQL input), or manually carrying out the query: HTML or MSAccess Report • Use the principles from last week’s information on page/site design XML Record • One per student/group member • For query results OR table contents • http://www.xmlblueprint.com/XML-MarkupLanguages.htm xmlBluePrint XML Markup Languages • Only needs to be well-formed (check manually, not with validator) • Follow the example provided in Standards and XML (Oct. 24), Anatomy of a Document Illustration: Bulletin Board • • • • • • Use Cases Entity Relationship Diagram MS Database with data Query Query results/output XML Record BBS: Scenario • Both students and teachers must log on, and supply their email addresses for security purposes. Messages that accumulate on the bulletin board have titles, dates/times, and also have attachments. – Search the contents of the messages for a particular word. – When were the most messages posted -day or night? Use Case • • • • Actors Preconditions Flow Postconditions Entity Relationship Diagram Database id type def’n 1 normal If nec 2 urgent asap 3 question clarif Query • SELECT users.first_name, users.last_name, message.title, message.date_time FROM users, message WHERE users.ID = message.user_ID AND message.content IS LIKE ‘%felix%’ ORDER BY message.date_time Query • SELECT COUNT(*) WHERE messages.time_date >= 18 OR messages.time_date <= 7 • SELECT COUNT(*) WHERE messages.time_date < 18 AND > 7 – If query A produces a bigger number, more messages were sent during the night. – Assumes that “daytime” begins at 7:00 AM and ends at 6:00 PM – Assumes that time_date uses a 24 hour clock Query Results • Messages containing the word “felix,” ordered by date: Help me John Smith, 21 March 2004 RE: Help me John Smith, 22 March 2004 What is the name of that cat Al Chen, 26 July XML <user> <id>12</id> <username>jdoe</username> <password>abc123</password> <email>[email protected]</email> <first_name>Jane</first_name> <last_name>Doe</last_name> </user>