1 Copyright © 2011, Oracle and/or its affiliates. All ... · Oracle Support for LINQ and Entity Framework •Query language interfaces –LINQ to Entities –Entity SQL –DML capabilities

1 Copyright © 2011, Oracle and/or its affiliates. All rights

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Entity Framework, LINQ, and WCF Data

Services for Oracle Database

Alex Keh

Principal Product Manager, Oracle


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Program Agenda

• Entity Framework and LINQ

– General Concepts and Functionality

– Oracle Support for Entity Framework and LINQ

• WCF Data Services and OData


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ADO.NET Entity Framework

• Object-relational mapper (ORM) for .NET

– Abstracts the logical (relational) database schema

– Presents schema in an application-specific conceptual schema

– Eliminates object-relational impedance mismatch

– NHibernate – another popular ORM for .NET

• Data source providers abstract DB interfaces when

programming against conceptual model


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ADO.NET Entity Framework

• Entity data model (EDM) – conceptual data model that

maps to the relational model

• Entities represent the individual object instances

– E.g. employees, sales orders

• EDM Wizard and Designer

– Generating and modifying DB and conceptual schema mapping


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Querying and Modifying Entities

• Query entities via alternative language to SQL

• LINQ to Entities

– Language-Integrated Query (LINQ)

– Query language integrated into .NET

– E.g. “from e in ctx.EMPs select e”


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Querying and Modifying Entities

• Entity SQL

– SQL variant for declarative queries and updates over entities and

their relationships

– Uses EntityClient classes to query

– E.g. “select value e from Entities.EMPs as e”

• DML

– Stored procedures

– SaveChanges method on ObjectContext


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Entity Framework Architecture


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Oracle Support for LINQ and Entity Framework

• Entity Data Model Wizard and Designer

– Generate a conceptual model from Oracle Database

– Update conceptual model, storage model, and mappings from

Oracle Database

– Generate Oracle SQL DDL script from the conceptual model


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• Query language interfaces

– LINQ to Entities

– Entity SQL

– DML capabilities (insert/update/delete)

• Entity Framework auto-generates DML statements for Oracle

Database

• Or use your own Oracle stored procedures for DML


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D E M O N S T R A T I O N

Entity Framework and LINQ


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• All standard ADO.NET APIs supported using ODP.NET

– Use EntityClient or ObjectContext

• No ODP.NET-specific APIs available, except…

– Settings available in the Registry or .NET config files including

ODP.NET connection string attributes

– E.g. FetchSize, SelfTuning, DllPath, Max Pool Size, HA Events,

Load Balancing, etc.


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• Function imports

– Define .NET methods that map to stored procedures

– Add Function Import dialog integration


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• Return implicit result sets

– Use REF CURSORs from stored procedures

– Available to both EF and non-EF scenarios

• EF: one result set per stored procedure

• Non-EF: one or more result set per stored procedure

– Return types

• Complex – read-only

• Entity – read and updatable

– Define result set bind and metadata info in .NET config file


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Function Import and Implicit Result Set


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• Return stored procedure scalar values

– Bind directly to stored procedure

– Only bind by name supported, not bind by position

– No .NET config changes necessary

// C#

ObjectParameter oparam = new ObjectParameter(“oparam", typeof(decimal));


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• Triggers and sequences

– Set StoreGeneratedPattern=“Identity” manually in SSDL

• Model/Schema generation

– Database-First

– Model-First

– Code-First – TBD


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Model-First


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• Requires .NET Framework 4 and Visual Studio 2010

• Time frame

– Beta: now available

– Production: Around end of 2011

• Availability will be announced via Twitter and Oracle

.NET newlsetter

– Twitter: @OracleDOTNET

– Newsletter: http://otn.oracle.com/dotnet

http://otn.oracle.com/dotnet


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Program Agenda

• Entity Framework and LINQ

• WCF Data Services and OData


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WCF Data Services and OData

• WCF Data Services

– Platform for exposing data via web services and REST

– Accessed over HTTP with a URI to return data

– Represented as EDM objects

• Open Data Protocol (OData)

– Protocol for sharing data

– Allows a multitude of data consumers to interoperate with a

multitude of data producers


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WCF Data Services and OData


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More Oracle .NET Resources

• OTN .NET Developer Center

– http://otn.oracle.com/dotnet

• For more questions

– [email protected]

http://otn.oracle.com/dotnet

mailto:[email protected]


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Q&A


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The preceding is intended to outline our general product direction.

It is intended for information purposes only, and may not be

incorporated into any contract. It is not a commitment to deliver

any material, code, or functionality, and should not be relied upon

in making purchasing decisions. The development, release, and

timing of any features or functionality described for Oracle’s

products remains at the sole discretion of Oracle.


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Documents

1 Copyright © 2011, Oracle and/or its affiliates. All ... · Oracle Support for LINQ and Entity Framework •Query language interfaces –LINQ to Entities –Entity SQL –DML capabilities