Database Application Development Methodology...Assumptions • Business process is well-designed •...
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Database Application Development Methodology © - an Example Leo Mark & Rocky Dunlap College of Computing Georgia Tech 1 © Copyright: Leo Mark and Rocky Dunlap
Transcript of Database Application Development Methodology...Assumptions • Business process is well-designed •...
DatabaseApplicationDevelopmentMethodology©
- anExample
LeoMark&RockyDunlapCollegeofComputing
GeorgiaTech
1©Copyright:LeoMarkandRockyDunlap
Assumptions• Businessprocessiswell-designed• Documentsareknown• Tasksareknown• Systemboundaryisknown• Onedatabaseschemaunifyingallviewscanbedesigned– difficult:interests,goals,power,politics– problemswiththemethodology?– problemswiththeorganization?– or-ga-ni-za-tion:“anentitycreatedtopursueasharedsetofgoals”
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TheSoftwareProcess
• Businessprocess(re-)design• Analysis• Specification• Design• Implementation• Testing• Operation• Maintenance
Managem
ent
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OverviewoftheMethodology- datafirst!!
AnalysisSpecificationDesignImplementation
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2
3
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InformationFlow
Diagram1
2b 4b
2a 3a 4a
Tasks
ERDiagram
RelationalSchema
AbstractCodew/SQL
MySQLRelationalPlatform
PHPCodew/SQL
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SQL
ExampleProjectDescription
• Theprojectdescriptionrepresentsthecustomer:– Businessprocess– Documents– Tasks– Systemboundary
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GTOnline isasimplesocialnetworkingapplicationwithasetofbasicfeaturessimilartothosefoundonsiteslikeFacebook andLinkedIn.GTOnline usersmaintainabasicprofileincludingtheirname,birthdate,hometown,currentcity,schoolstheyhaveattended,andplacesofemployment.Userscanconnecttootherusersbysendingfriendrequests.Ifarequestisaccepted,thenafriendshiplinkisestablishedbetweenthetwousers.Inadditiontomaintainingbasicprofileinformation,userscanlettheirfriendsknowwhattheyarecurrentlydoingbywritingstatusupdates.Userscanalsocommentontheirfriends’statusupdatesaswellastheirownstatusupdates.TheGTOnline applicationalsosupportsadministrativeuserswhomaintainthelistofschoolsandplacesofemployment.
GTOnline Lite Social Networkingfor Networking Socialites
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GTOnline isasimplesocialnetworkingapplicationwithasetofbasicfeaturessimilartothosefoundonsiteslikeFacebook andLinkedIn.GTOnline usersmaintainabasicprofileincludingtheirname,birthdate,hometown,currentcity,schoolstheyhaveattended,andplacesofemployment.Userscanconnecttootherusersbysendingfriendrequests.Ifarequestisaccepted,thenafriendshiplinkisestablishedbetweenthetwousers.Inadditiontomaintainingbasicprofileinformation,userscanlettheirfriendsknowwhattheyarecurrentlydoingbywritingstatusupdates.Userscanalsocommentontheirfriends’statusupdatesaswellastheirownstatusupdates.TheGTOnline applicationalsosupportsadministrativeuserswhomaintainthelistofschoolsandplacesofemployment.
GTOnline Lite Social Networkingfor Networking Socialites
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GTOnlineLogin
Password
LoginRegister
NewusersclickheretocreateanewGTOnlineaccount
GTOnline Lite Social Networkingfor Networking Socialites
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EditGTOnlineProfileforMichaelBluth
Male
1968-06-20
GeorgiaInstituteofTechnology(College/University)
1990
DunderMifflin
AssistanttotheRegionalManager
WilliamMcKinley(HighSchool)
1986
Sex
Birthdate
CurrentCity
Hometown
MichaelBluth
School
Education AddAnotherSchool
YearGraduated
Professional
DeletethisSchool
AddAnotherJob
Employer
JobTitle
DeletethisJob
Save
Cancel
AddsanotherboxontheuserinterfacewithSchoolandYearGraduated.
AddsanotherboxtotheuserinterfacewithEmployerandJobTitle.
Maybeleftblank
Listsavailableschoolsandtheirtype
School
YearGraduated
DeletethisSchool
Interests TennisWatchingInceptionOverandOverAgainSeinfeld
Add
Addsanewinterestandrefreshesthepage
Save
Save
Save
GTOnlineNewUserRegistration
Bluth
Michael
Password
ConfirmPassword
RegisterCancel
Returnstotheloginscreen
LastName
FirstName
Allfieldsarerequired
GTOnline Lite Social Networkingfor Networking Socialites
ViewGTOnlineProfileforMichaelBluth
Sex
Birthdate
CurrentCity
Hometown
MichaelBluth
School
Education
YearGraduated
Professional
Employer
JobTitle
Male
Scranton,PA
1968-06-20
BeveryHills,CA
GeorgiaInstituteofTechnology(College/University)
1990
DunderMifflin
AssistanttotheRegionalManager
SchoolName
YearGraduated
WilliamMcKinley(HighSchool)
1986
ViewStatusUpdatesViewFriends
LogOut
SearchforFriends,ViewPendingRequests,andEditProfileareonlyvisibleifthisistheprofileofthecurrentlyloggedinuser
OnlyshowYearGraduatediffieldisnotnull
SearchforFriendsViewPendingRequests
EditProfile
Interests TennisWatchingInceptionOverandOverAgainSeinfeld
SearchforFriends
ScrantonHometown Search
Name
SearchforFriends
SearchResults
BobVance Scranton,PAPhyllisLapin-Vance Scranton,PA
Name Hometown
AfterclickingSearch,anyrelevantresultsappearhere(oronanewpage)
ClickingonanameshowstheAddFrienddialogbox
Existingfriendsshouldnotbeshowninthelist
Close
ThesethreefieldsareORedtogether
BacktoProfile
RequestNewFriendforMichaelBluth
Co-worker
Hometown
SendFriendRequest
Theuserprovidesanyvaluefortherelationship
Name
RequestNewFriendforMichaelBluth
PhyllisLapin-Vance
Scranton,PA
Relationship
Cancel
Friendisnotimmediatelyadded.Instead,arequestissenttotheotheruser.
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GTOnlineFriendsList
FriendsofMichaelBluth
Name Relationship ConnectedSince
AngelaMartin Co-worker August17,2009DwightSchrute Co-worker July9,2009GeorgeBluth,Sr. Father March10,2008GeorgeMichaelBluth Son March10,2008JimHalpert Co-worker July9,2009LindseyFunke Sister November22,2009MichaelScott Boss April1,2009PamBeasley Co-worker June14,2009TobiasFunke Brother-in-law November23,2009
Clickingonanameshowsthatfriend’sprofile
Clickingontheheaderre-sortsthelistoffriends BacktoProfile
Returntothisuser’sprofile
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PendingFriendRequestsforMichaelBluth
Accept
Thefollowingpeoplehaverequestedtobefriendswithyou
SueSylvester Lima,OH FormerCoach
WillSchuester Lima,OH FormerDirector
Name Hometown Relationship
ClickingAcceptaddstheuserasafriendandrecordsthecurrentdate
ClickingRejectcancelstherequest
Reject
Accept Reject
Close
Itispossibletoclosethewindowevenwithpendingrequests.Thoserequestsshouldstillappearthenexttimetheuserviewsthispage.
Youhaverequestedtobefriendswiththesepeople
PhyllisLapin-Vance Scranton,PA Co-worker
Name Hometown Relationship
Clickingonauser’snameshowshisorherprofile
Cancel
Cancelarequestbeforeitisacceptedorrejected
Thesesnippets oftaskrequirements aretakenfromacomprehensive project description andarejustpartofwhatisusedtodesigntheIFDDiagram.
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Analysis– InformationFlowDiagram
• informationflow;not controlflow
• never connecttwodocuments
• never connecttwotasks
D1
T1
T2
T3
Database
D2
D6
D3
D5
D4
T4
documentname
taskname
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FriendSearchandResults
Friendrequest
UsedocumentandtasknamesfromtheprojectdescriptionintheIFD!
IFD
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• Everythinginthedatabasemustcomefromsomewhere
• Everythingontheinputdocumentsmustgosomewhere
• Everythinginthedatabasemustbeusedforsomething• Everythingontheoutputdocumentsmustcomefromsomewhere
D1
T1T2?
D2 D3
Whatgoesintothedatabase?Whatcomesoutofthedatabase?
?
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Specification
• EERDiagram• DataFormats• Constraints• TaskDecomposition
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GTOnlineNewUserRegistration
Bluth
Michael
Password
ConfirmPassword
RegisterCancel
Returnstotheloginscreen
LastName
FirstName
Allfieldsarerequired
GTOnline Lite Social Networkingfor Networking Socialites
GTOnlineLogin
Password
LoginRegister
NewusersclickheretocreateanewGTOnlineaccount
GTOnline Lite Social Networkingfor Networking Socialites
[Requirement]:…..AllusersareuniquelyidentifiedbyhisorherEmailAddress.Providing avalidEmailAddress andPassword combinationwilllogtheuserintothesystem…..
[Question]:ShouldNamebeacompositeattribute?Well,youdecide, sortof…..
Name
Thesesnippets oftaskrequirements aretakenfromacomprehensiveproject description andarejustpartofwhatisusedtodesigntheERDiagram.
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User
Email Password
NameFirstName
LastName
UseattributenamesfromthedocumentsintheEERDiagram!
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EditGTOnlineProfileforMichaelBluth
Male
1968-06-20
GeorgiaInstituteofTechnology(College/University)
1990
DunderMifflin
AssistanttotheRegionalManager
WilliamMcKinley(HighSchool)
1986
Sex
Birthdate
CurrentCity
Hometown
MichaelBluth
School
Education AddAnotherSchool
YearGraduated
Professional
DeletethisSchool
AddAnotherJob
Employer
JobTitle
DeletethisJob
Save
Cancel
AddsanotherboxontheuserinterfacewithSchoolandYearGraduated.
AddsanotherboxtotheuserinterfacewithEmployerandJobTitle.
Maybeleftblank
Listsavailableschoolsandtheirtype
School
YearGraduated
DeletethisSchool
Interests TennisWatchingInceptionOverandOverAgainSeinfeld
Add
Addsanewinterestandrefreshesthepage
Save
Save
Save
RegularUser
Interests
CurrentCity
HomeTown
Sex
Birthdate
[Requirements]:…..AllGTOnlineusers(exceptadministrativeusers)haveaprofilecontainingbasicinformation aboutthem.…..
[Requirements]:…..Administrativeusershavesomeofthesameinformationasregularusers(EmailAddress,Password,FirstName,andLastName)…..,butdonothaveafullprofileandcannotrequestfriends, etc.Ausermustbeeitheranadministratororaregularuser,butneverboth.GTOnline alsotracksthelastdateandtimethatanadminuserloggedintothesystem…..
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RegularUser
User
AdminUser
d
LastLogin
Password
NameFirstName
LastNameInterests
CurrentCity
HomeTown
Sex
Birthdate
[Requirements]:…AlistofSchools,fromwhichtheusercanselect,ismaintainedinthesystem.AssumethatallSchoolNameswillbeunique.AusercanhaveanynumberofschoolsassociatedwithhimorherandcanprovideaGraduationDate foreachschool.…..Itispossible thatthesameschoolwillappearmultiple timeswithdifferentgraduationdates.
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EditGTOnlineProfileforMichaelBluth
Male
1968-06-20
GeorgiaInstituteofTechnology(College/University)
1990
DunderMifflin
AssistanttotheRegionalManager
WilliamMcKinley(HighSchool)
1986
Sex
Birthdate
CurrentCity
Hometown
MichaelBluth
School
Education AddAnotherSchool
YearGraduated
Professional
DeletethisSchool
AddAnotherJob
Employer
JobTitle
DeletethisJob
Save
Cancel
AddsanotherboxontheuserinterfacewithSchoolandYearGraduated.
AddsanotherboxtotheuserinterfacewithEmployerandJobTitle.
Maybeleftblank
Listsavailableschoolsandtheirtype
School
YearGraduated
DeletethisSchool
Interests TennisWatchingInceptionOverandOverAgainSeinfeld
Add
Addsanewinterestandrefreshesthepage
Save
Save
Save
M
NRegularUser
School
YearGraduated
SchoolName
GTOnlineAdministrator–ManageSchools
College/University
Schools
GeorgiaInstituteofTechnology College/UniversityWilliamMcKinley HighSchoolUniversityofGeorgia MiddleSchoolBuckwheatElementary ElementarySchool
Add
BacktoMenu
Schooltypesinclude:College/University,HighSchool,MiddleSchool,andElementarySchool
Addsanewschooltothelistandrefreshesthepage
[Requirements]:…..EachschoolmusthaveaSchoolType.Therearefourpossibletypes:College/University,HighSchool,MiddleSchool,andElementarySchool.…..Itshouldbepossibleforthedatabaseadministratortoaddnewschooltypesfrombehind thescenes.
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M
M
N
N
RegularUser
School
SchoolType
YearGraduated
TypeName
SchoolName
[Requirements]:…..Administratorsareresponsible formanaging thelistofEmployers.AssumethatallEmployershaveauniqueName.
GTOnlineAdministrator–ManageEmployers
Employers
DunderMifflinDepotofOfficeSuppliesPaper,Inc.CityofAtlantaCoca-ColaDeltaDatabaseDesigners,Inc.
Add
BacktoMenu
Addsanewemployertothelistandrefreshesthepage
[Requirements]:…..TheJobTitle fieldisnotmanagedbytheadministratorandcanbeanyvalueprovidedbytheuser.AprofilecancontainmultipleEmployers andthesameEmployermayevenappearmultiple timesaslongastheJobTitle isdifferent ineachcase.
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M
N
RegularUser
Employer
JobTitle
EmployerName
RequestNewFriendforMichaelBluth
Co-worker
Hometown
SendFriendRequest
Theuserprovidesanyvaluefortherelationship
Name
RequestNewFriendforMichaelBluth
PhyllisLapin-Vance
Scranton,PA
Relationship
Cancel
Friendisnotimmediatelyadded.Instead,arequestissenttotheotheruser.
PendingFriendRequestsforMichaelBluth
Accept
Thefollowingpeoplehaverequestedtobefriendswithyou
SueSylvester Lima,OH FormerCoach
WillSchuester Lima,OH FormerDirector
Name Hometown Relationship
ClickingAcceptaddstheuserasafriendandrecordsthecurrentdate
ClickingRejectcancelstherequest
Reject
Accept Reject
Close
Itispossibletoclosethewindowevenwithpendingrequests.Thoserequestsshouldstillappearthenexttimetheuserviewsthispage.
Youhaverequestedtobefriendswiththesepeople
PhyllisLapin-Vance Scranton,PA Co-worker
Name Hometown Relationship
Clickingonauser’snameshowshisorherprofile
Cancel
Cancelarequestbeforeitisacceptedorrejected
[Requirements]:…..friendship isnotalwaysreciprocal…..justbecauseEmilyisfriendswithSarah,thisdoesnotimplythatSarahisfriendswithEmily.…..
…..theDateConnected fieldissetwhenthefriend requestisaccepted,not whentherequestisoriginally sent.
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RegularUser
Friendship
1
NN
1
Relationship
DateConnected
request
accept
M
M
N
N
M
N
RegularUser
User
AdminUser
School Employer
d
SchoolType
JobTitleYearGraduated
TypeName
EmployerName
SchoolName
LastLogin
Password
NameFirstName
LastName
Friendship
1
NN
1
Interests
CurrentCity
HomeTown
Sex
Birthdate
Relationship
DateConnected
request
accept
EERDiagram
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GTOnlineNewUserRegistration
Bluth
Michael
Password
ConfirmPassword
RegisterCancel
Returnstotheloginscreen
LastName
FirstName
Allfieldsarerequired
GTOnline Lite Social Networkingfor Networking Socialites
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RegularUser
User
d
Email Password
NameFirstName
LastNameInterests
CurrentCity
HomeTown
Sex
Birthdate
DataFormats- beg,steal,borrow
User:• Email:max36chars.Example: [email protected]• Password:max20chars.Example:qwerty• Name:FirstName:max25chars;Last:max40chars• Addresses(whenneeded)areveryvery difficult.
E.g.,look atthe208pageguidelineathttp://pe.usps.com/cpim/ftp/pubs/pub28/pub28.pdf
RegularUser:• Birthdate:Date:'YYYY-MM-DD'• Sex:{M,F}• CurrentCity,HomeTown:max 20chars,each• Interests:multi-valuewith16chars,each
Constraints
Examples:• DateConnected isNULLuntilrequestisaccepted.• CannotbeFriendwithyourself.• CanonlycommentonStatusofFriends.
Ignore:• Dataformattingconstraints• ConstraintsthatcanbeexpressedintheEERDiagram
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