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Introduction to Enterprise Objects Framework
Transcript of Introduction to Enterprise Objects Framework
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Introduction toEnterprise Objects Framework
Session 703
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Introduction toEnterprise Objects Framework
James DempseyOperations Engineer
Apple Software Customer Seeding
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What You’ll Learn•An overview of the purpose and benefits of EOF•Introduction to basic database operations•Working with persistent objects•Demonstration of desktop EOF applications•A conceptual model of how EOF works
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Technology Framework•An introduction to the EOAccess and
EOControl frameworks of EOF•These frameworks form the core of
database access in• HTML and XML-based
WebObjects applications• Cocoa EOF applications• Java Client applications
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4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
DepartmentDepartment
1,000,0001,000,000
namename “Sales”“Sales”
budgetbudget
Object-Oriented Applications•Different classes of
objects to modeldifferent types
•Each object stores data•Each class of object has
behavior—business logic•How does object state
persist between uses?
EmployeeEmployee
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NAME BUDGETDEPT_ID
DEPARTMENT
R&D 4,000,000501
Sales 1,200,000502
NAME SALRY SDATE DEPT_IDE_ID
EMPLOYEE
Fred 60,000 4/29/00 503101
Beth 65,000 1/19/00 501102
•Different tables modeldifferent types of data
•Each row stores data•Database can execute
stored procedures•How to use the data
in an object-orientedmanner?
Database-Driven Applications
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An object-relational persistence layer
Enterprise Objects Framework
•Uses the natural mapping between objectsand relational databases
•Abstracts business logic and database operations•Preserves object-oriented nature of
persistent objects•Sophisticated, mature, object-oriented
architecture
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4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
EmployeeEmployee
Enterprise Objects
•Implement theEOEnterpriseObjectinterface
•Objects with built-inpersistence
Affectionately known as EOs
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NAME SALARY ST_DATE DEPT_IDEMP_ID
EMPLOYEE
Fred 60,000 4/29/00 503101
Beth 65,000 1/19/00 501102
Entities and Attributes
1/19/001/19/00
firstNamefirstName “Beth”“Beth”
startDatestartDate
salarysalary 65,00065,000
departmentdepartment
EmployeeEmployee
4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
EmployeeEmployee
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4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
EmployeeEmployee
Relationship by Reference
DepartmentDepartment
1,000,0001,000,000
namename “Sales”“Sales”
budgetbudget
A unique reference to another object
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NAME BUDGETDEPT_ID
DEPARTMENT
R&D 4,000,000501
Sales 1,200,000502
NAME SALARY ST_DATE DEPT_IDEMP_ID
EMPLOYEE
Fred 60,000 4/29/00 503101
Beth 65,000 1/19/00 501102
Relationship by JoinA unique primary key value in another table
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4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
EmployeeEmployee
NAME SALARY ST_DATE DEPT_IDEMP_ID
EMPLOYEE
Fred 60,000 4/29/00 503101
From Row to EO and Back
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Model Defines the MappingDefine object-relational mapping in EOModeler
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DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
Multiple Views, Same Data
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Logic Written in Standard Java
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
Object-oriented design in a widely used language
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Distributed ProcessingOff-load logic processing to applications
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
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Dynamically Generated SQL
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
Transactions and statements generated by EOF
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Access to Database FeaturesCan access stored procedures and execute customSQL from within EOF as needed
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
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Multiple Data Sources
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
Using data from different sources abstracted at alow level—programmatic interface remains the same
DatabaseDatabaseDatabaseDatabase
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Editing
Context
Editing
ContextEditing
Context
Editing
ContextEditing
Context
Editing
ContextEditing
Context
Editing
ContextEditing
Context
Editing
ContextEditing
Context
Editing
Context
Separate ‘Scratch Pad’ Per User
DatabaseDatabase
HTML-Based
WebObjects
Application
HTML-Based
WebObjects
Application
XML-Based
WebObjects
Application
XML-Based
WebObjects
Application
Cocoa
EOF
Application
Cocoa
EOF
Application
Java Client
EOF
Application
Java Client
EOF
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
EOF-based
Application
Each user provided a separate context for makingedits and canceling changes
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Basic EOF Operations•Fetch•Insert•Update•Delete•Save•Revert
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EOEditingContextEOEditingContext
EOEditingContext
•Fetches from the database•Observes updates to all
EOs it has fetched•Tracks inserts and deletes•Keeps changes until they
are saved or reverted
The class you use most for programmatic control
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•Every session in a WebObjects application has adefault editing context
•Editing context for desktop apps lives in nib file•You can create your own as well
EOEditingContext ec =session().defaultEditingContext();
EOEditingContext ec =new EOEditingContext();
Getting an Editing Context
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•Default editing context is automatically lockedand unlocked in WebObjects applications
•Nib-based editing contexts not locked by default•Lock and unlock editing contexts that you create
before and after useec.lock();
// use editing contextec.unlock();
Locking the Editing ContextFor use with multi-threaded applications
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Fetching
•Create a fetch specification•Access an editing context•Tell editing context to fetch
using the specification•Receive an array of retrieved
Enterprise Objects
Many techniques—all with same underlying steps
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Graphical Fetch BuilderDefine fetch graphically in EOModeler
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EOFetchSpecification spec;NSDictionary bindings;NSArray results;
EOEditingContext ec =session().defaultEditingContext();
results =EOUtilities.
objectsWithFetchSpecificationAndBindings(ec, “Customer”, “FetchSpec”, bindings);
Performing the Fetch•Fetching returns an array of EOs
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eo =EOUtilities.createAndInsertInstance
(ec, “Employee”);
Creating and Inserting•Two separate steps combined in one
convenience methodEOEnterpriseObject eo;EOEditingContext ec;
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ec.deleteObject(eo);
Deleting•Tell the editing context to delete the object;
It will be deleted next time changes are savedEOEnterpriseObject eo;EOEditingContext ec;
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•Make changes using standard accessors—the editing context observes all changes
•Key Value Coding provides generic accessors
Employee employee;
employee.setName(“Jerry Long”);
employee.takeValueForKey(“Jerry Long”, “name”);
employee.valueForKey(“name”);
Editing
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•Pending changes are not sent to the databaseuntil you tell editing context to save changes
•Pending changes are discarded by tellingthe editing context to revert
editingContext.saveChanges();
editingContext.revert();
Saving and Reverting Changes
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DemoGenevieve PuruggananWebObjects Engineering
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Using EOs as Objects•Subclass EOGenericRecord and add class-specific
business logic and validation logic•Call methods, put ‘em in collections, hook ‘em
up to user interface elements•Think about them as objects, and leave the
database concepts in the database•Example: Relationships
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NSArrayNSArray
An Example Relationship
4/29/004/29/00
firstNamefirstName “Fred”“Fred”
startDatestartDate
salarysalary 60,00060,000
departmentdepartment
DepartmentDepartment
1,000,0001,000,000
namename “Sales”“Sales”
budgetbudget
EmployeeEmployee
employeesemployees
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EmployeeEmployee
emailemail
ProjectProject
employeeemployee
EmailAddressEmailAddress
addressaddress “[email protected]“[email protected]
An Example
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SELECT t0.Comments, t0.CreatedBy,
t0.CreatedByMethod, t0.CreationDate, t0.ID,
t0.PortalInvitationText, t0.ModificationDate,
t0.ModifiedBy, t0.ModifiedByMethod,
t0.PrimarySeedEngineer, t0.ProjectDescription,
t0.ProjectInternalName, t0.ProjectName, t0.Status
FROM Projects t0 WHERE t0.Status = "Active"
Some SQL
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SELECT t0.ParticipantProjectMailingAddressID,
t0.Comments, t0.CreatedBy, t0.CreatedByMethod,
t0.CreationDate, t0.DefaultConfigurationID,
t0.ParticipantProjectEmailAddressID, t0.Grade, t0.ID,
t0.ModificationDate, t0.ModifiedBy,
t0.ModifiedByMethod, t0.NumBugsSubmitted,
t0.NumDiscussionEntries, t0.NumIssuesSubmitted,
t0.NumSurveysCompleted,
t0.NumSurveysRequested, t0.ParticipantEndDate,
t0.ParticipantID, t0.ParticipantStartDate, t0.ProjectID,
t0.RanWizard, t0.Status FROM ParticipantProjects t0
WHERE t0.ID = 9145
Some SQL
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SELECT t0.AgeRange, t0.Comments, t0.Company,
t0.CreatedBy, t0.CreatedByMethod, t0.CreationDate,
t0.PrimaryTestingEnvironment, t0.FileMakerID,
t0.FirstName, t0.Gender, t0.ID, t0.JobTitle,
t0.LastName, t0.MiddleInitial, t0.ModificationDate,
t0.ModifiedBy, t0.ModifiedByMethod,
t0.NDADateSigned, t0.NDAVersion, t0.NickName,
t0.Occupation, t0.ParticipantGrade,
t0.ProgramStatus, t0.Salutation,
t0.SelectionJustification FROM Participants t0
WHERE t0.ID = 9145
Some SQL
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SELECT t0.CreatedBy, t0.CreatedByMethod,
t0.CreationDate, t0.EmailDescription,
t0.EmailAddress, t0.ID, t0.IsDefault,
t0.EmailAddressIsInvalid, t0.ModificationDate,
t0.ModifiedBy, t0.ModifiedByMethod, t0.ParticipantID
FROM ParticipantEmailAddresses t0 WHERE
t0.ParticipantID = 1516
Some SQL
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project.employee.emailAddress.email
Or a Key Path•Attach a user interface element
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DemoGenevieve PuruggananWebObjects Engineering
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Desktop Database Applications
•Event driven applications demand a moredynamic interface than the web
•In Model-View-Controller design pattern, muchcontroller code is synching view to model
•EOInterface abstracts much of thiscontroller work
A user interface challenge beyond the web
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DemoGenevieve PuruggananWebObjects Engineering
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Fred 60,000 4/29/00 503101
EOAccessEOAccess
EOEO
EOControlEOControl
EOInterfaceEOInterface
The EOF StackWho are the frameworks in your neighborhood?
DatabaseDatabase
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Adaptor LayerAdaptor Layer
Database LayerDatabase Layer
EOModelEOModel
EOAccess Framework
DatabaseDatabase
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EOModelGroupEOModelGroup
EOModelEOModel
EOModelEOModel
Multiple Data Sources
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
Multiple EOModels, one per data source
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EOObjectStore
Coordinator
EOObjectStore
Coordinator
EOEditingContextEOEditingContext EOEditingContextEOEditingContext EOEditingContextEOEditingContext
EOControl FrameworkEOAccess coordination and programming control
EOModelGroupEOModelGroup
EOModelEOModel
EOModelEOModel
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
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EOInterfaceEOInterface
EOInterface Framework
EOObjectStore
Coordinator
EOObjectStore
Coordinator
EOEditingContextEOEditingContext EOEditingContextEOEditingContext EOEditingContextEOEditingContext
EOModelGroupEOModelGroup
EOModelEOModel
EOModelEOModel
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
Database LayerDatabase Layer
Adaptor LayerAdaptor Layer
DatabaseDatabase
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Review
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WebObjects Lab•Located downstairs in Room L•Lab hours
• Monday 12:00pm–6:00pm• Tuesday 9:00am–2:00pm*• Wednesday 9:00am–6:00pm• Thursday 9:00am–6:00pm• Friday 9:00am–6:00pm*Conversion Workshop Tuesday 2-6pm; Sign up in Lab
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Room A1Thurs., 3:30pm
Room A1Thurs., 3:30pm
711 Advanced Data Modelingand Connectivity
Room A1Thurs., 5:00pm
Room A1Thurs., 5:00pm
712 Advanced Enterprise ObjectsFrameworks
Room A1Fri., 10:30am
Room A1Fri., 10:30am
714 Optimizing WebObjects Applications
Roadmap
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Services Consulting, Integration, Training and Certification
(800) [email protected]
Bob FraserWebObjects Product [email protected]
Toni Trujillo VianDirector, WebObjects [email protected]
Who to Contact
http://developer.apple.com/wwdc2002/urls.html
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For More Information•WebObjects Developer Documentation
http://developer.apple.com/techpubs/webobjects
•Apple Professional Services Technical Support(www.apple.com/services/technicalsupport)
•Other places• www.apple.com/webobjects
• developer.apple.com/webobjects
• www.apple.com/services
• www.info.apple.com/webobjects
Subscribe to:[email protected]
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DocumentationEnterprise Objects Framework Develop’s Guide
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How to Access Documentation•Most up-to-date: PDF and HTML
http://developer.apple.com/techpubs/webobjects•Hardcopy print-on-demand
Vervante.com under Related Resources•Product CD
Documents folder and installed in /Developer/Documentation/WebObjects
•In the box (localized) Installation Guides, What’s New, WebObjects Overview, Java Client Desktop Applications, Discovering WebObjects for HTML
•Check ADC News for latest updates http://developer.apple.com/devnews
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Q&A
Toni Trujillo VianDirector, WebObjects Engineering
http://developer.apple.com/wwdc2002/urls.html
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