ADO.NET Entity Framework

•

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The ADO.NET Entity Framework is part of Microsoft’s next generation of .NET technologies. It is intended to make it easier and more effective for object-oriented applications to work with data.

Technologie

 Originally intended to
be part of theVisual
Studio 2008 Release
 Now scheduled for
“later”.
 Entity Framework is
currently Beta 2
 Entity FrameworkTools
are currently CTP

Inherit differences between data expression in a relational database and
the same data expressed in an object-oriented application.

• Almost any business
application today has to
speak to a relational
database.
• This involves the usual
suspects of tables with
foreign keys, a
smattering of views,
and generally a gob of
stored procedures.

 Applications
themselves are written
in a completely
different world.
 The same data that
lives in the relational
database is represented
entirely differently in
the application.

 The result of this
“impedance mismatch”
is that developers
devote a lot of time and
energy writing code to
translate between how
the database likes to
see data and how the
application likes to see
data.

 Hibernate (Java)
 Enterprise Objects Framework (Mac OS)
 NHibernate (.NET)
 LINQ to SQL (Visual Studio 2008)
 And many, many, more …

 The ADO.NET Entity
Framework seeks to
remedy the problem by
providing a layer of
abstraction between
the logical data model
and the application
domain.

 Closer to the application
problem space
 Better suited for object
oriented programming
 Supports Inheritance
 Supports complex types
 Relationships are more
meaningful to the
application

The tools and technology that developers will interact with when using
the ADO.NET Entity Framework

 A gob of XML that
defines
 Logical DataTables,
Views, Foreign Keys
 Entity Objects that Map
to the Logical Data
 The Mapping Between
theTwo

 AVisual Studio
Designer that protects
developers from the
XML that is the EDM

 A code-generated data
context created from
the Entity Data Model
 Responsible for
managing
communication
between the conceptual
data model and the
logical data model

 Code-generated class
definitions for objects
defined in the EDM.

 Queries the object
model created against
the EDM
 Still string-based. No
compiler checking
 An ugly mix of code and
eSQL statements

 Full compiler checking.
No wondering if the
query is valid.
 A fun new SQL-Like
syntax
 More OO-ish

Database TablesDatabase Tables Entity Data ModelEntity Data Model

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ADO.NET Entity Framework

2.  The ADO.NET Entity Framework is part of Microsoft’s next generation of .NET technologies.  It is intended to make it easier and more effective for object- oriented applications to work with data.

3.  Originally intended to be part of theVisual Studio 2008 Release  Now scheduled for “later”.  Entity Framework is currently Beta 2  Entity FrameworkTools are currently CTP

4. Inherit differences between data expression in a relational database and the same data expressed in an object-oriented application.

5. • Almost any business application today has to speak to a relational database. • This involves the usual suspects of tables with foreign keys, a smattering of views, and generally a gob of stored procedures.

6.  Applications themselves are written in a completely different world.  The same data that lives in the relational database is represented entirely differently in the application.

7.  The result of this “impedance mismatch” is that developers devote a lot of time and energy writing code to translate between how the database likes to see data and how the application likes to see data.

8.  Hibernate (Java)  Enterprise Objects Framework (Mac OS)  NHibernate (.NET)  LINQ to SQL (Visual Studio 2008)  And many, many, more …

9.  The ADO.NET Entity Framework seeks to remedy the problem by providing a layer of abstraction between the logical data model and the application domain.

10.  Closer to the application problem space  Better suited for object oriented programming  Supports Inheritance  Supports complex types  Relationships are more meaningful to the application

11. The tools and technology that developers will interact with when using the ADO.NET Entity Framework

12.  A gob of XML that defines  Logical DataTables, Views, Foreign Keys  Entity Objects that Map to the Logical Data  The Mapping Between theTwo

13.  AVisual Studio Designer that protects developers from the XML that is the EDM

14.  A code-generated data context created from the Entity Data Model  Responsible for managing communication between the conceptual data model and the logical data model

15.  Code-generated class definitions for objects defined in the EDM.

16.  A brand new SQL language to learn  Leverages the rich, object- oriented Entity Data Model  Inheritance  Collections  ComplexTypes  Literal Strings – No Compiler Checking  Questionable value in embedded SQL in code

17.  Queries the object model created against the EDM  Still string-based. No compiler checking  An ugly mix of code and eSQL statements

18.  Full compiler checking. No wondering if the query is valid.  A fun new SQL-Like syntax  More OO-ish

19. Database TablesDatabase Tables Entity Data ModelEntity Data Model

20. Database TablesDatabase Tables Entity Data ModelEntity Data Model

ADO.NET Entity Framework

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