1. CIS 764 Database Systems Engineering
L4:
Design process and artifacts
(and reverse engineering)
<no audio yet … to be added early in Sept. >
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2. CIS 764 Database Systems Engineering
No new homework assignment today.
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technology …. J2EE, dotNet, Ruby, …
JDev, Eclipse, VisStudio, ..
methodology … RUP (Rational Unified Process),
MDD / MDA (model driven development / architecture)
extreme programming / developent
management … install tools, backups, product selection, training,
process / people management, security policies,
schedules, budget, …
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4. CIS 764 Database Systems Engineering
Note:
Traditional DB design - -> data models:
> ER diagrams (P. Chen) ………………………….conceptual , not OO
> schema diagrams (Access, Visio, other tools) ... tables, not OO
> UML (an emerging notation for data models) … UML, not OO !!
read:
Scott Ambler’s own profile for UML database models.
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… notes:
stereotype is “data model”
storage map is “relational database”
kinds of classes: entity
lookup table
index
stored procedure
association table
view
kinds of associations: “arrow”
aggregation
composition
column tags: PK, FK, …
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conceptual model … most abstract,
language/platform independent
(never a table model )
logical model …….. specific parameters, constraints
physical model …. tables, concrete types
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OO design process: … in practice, always iterative
use case model (requirements) … what operations
Process model (“swim lanes”) … coordination of ops
GUI design: page designs, page flow, mock-up prototype,
state models
domain model use case assertions, class model
Semantic constraints:
invariants, operation assertions, state models
physical data model (and OO to relational mapping)
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UML tutorials:
OMG (Object Modeling Group)
Rational / Borland (old, but simple)
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Sample documents from Sundeep MSE:
A User Community
(based on Orkut.com)
 not a perfect example …
several weak features.
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Manage Friends
* Purpose: The purpose of this part of the application is to enable user to
manage his friends list.
*Input: The user will select his friends section and choose to manage friends
with various options given.
*Processing: The user selection will be validated and accordingly the action
is being performed again the user’s account at the server. Friends list is
then being processed at the server.
*Output: The required action is being performed based on the selection of
the action, between Add friend, Delete friend, Scrap friend.
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13. CIS 764 Database Systems Engineering
Process model:
<did not have one !!!>
That means any user can do any (legal) operation
in any order.
whereas, typical enterprise has coordination of operations:
e.g. I cannot access KATS until I am appointed as faculty.
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--Invariants--
Every photo in database should be associated to a single user.
Owner is a member of the community.
--Every photo in database should be associated to a single user.
association photoasso between Photo[0..*] role userphoto SocialUser[1] role user end
--Owner is a member of the community. context SocialUser inv CommOwnerIsMember: SocialUser.allinstances -> forAll(S | S.myCommunities.Owns->includes(S) implies S.myCommunities.member->includes(S))
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CreateCommunity(c_name : String, c_pic : String) : Boolean
pre : Community.allInstances.c_name->excludes(c_name)
post :
post :
DeleteCommunity(c_id : Integer)
pre : Community.allInstances.c_id->includes(c_id)
post :
post :
post :
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Test Plan: derived from method assertions
include plan for function and regression testing
function: test both positive action and invalid inputs & states
regression: JUnit , NUnit … repeat tests as system is changed
Registering a Social User
Login
Adding a Friend
Deleting a Friend
Scrap a Friend
Creating a Community
Joining a Community
Manage photos of user
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Now the reverse engineering process:
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End
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