The Microsoft

Technical Roadshow 2007

Advances for Data in VS “Orcas”

Mike TaultyDeveloper & Platform GroupMicrosoft LtdMike.Taulty@microsoft.com http://www.mtaulty.com

Earlier that day....

ObjectObject

ObjectObject

IEnumerable<T>?

ObjectObject

ObjectObject

from itemName in srcExprwhere predExprorderby (keyExpr (ascending | descending)?)*select selExpr...

where ObjectObject

ObjectObjectorderby

selectObjec

t

IQueryable<T>?

ObjectObject

ObjectObject

from itemName in srcExprwhere predExprorderby (keyExpr (ascending | descending)?)*select selExpr...

where

whereorderby

whereorderby

select

ObjectObject

ObjectObject

Object

IEnumerable vs IQueryable

Agenda”Would you like LINQ with that?”

1 2

3

LINQ Pattern from itemName in srcExpr join itemName in srcExpr on keyExpr equals keyExpr

(into itemName)?let itemName = selExprwhere predExprorderby (keyExpr (ascending | descending)?)*select selExprgroup selExpr by keyExpr into itemName query-body

LINQ over XML1

System.Xml.XLinq

New XML API (more DOM than reader)Key classes: XElement, XAttribute

LINQ over XML

LINQ to SQL2

System.Data.Dlinq – Data API

DataContext, Table & Friends

But what about?

IdentityRelationshipsInsert, Update, DeleteConstraintsGenerated columnsTransactions

Stored Procedures, Views, FunctionsDeferred LoadingInheritanceConcurrencyModifications without query

e.g. N-Tier updates

More detail but no updates yet...

Identity Management

SQL

My Process

Identity Management

Row ID = 58, Colour=Red

Query Id=58

UpdateId=58,

Colour=Blue

QueryId=58

ObjectId=58,

Colour = Red Original

ObjectId=58,

Colour = Blue

Current

Change Tracking (1)

SQL

DataContext.SubmitChanges()

Compare & Generate SQL

My Process

Change TrackingObjectId=58,

Colour = Red Original

ObjectId=58,

Colour = Blue

Current

Change Tracking (2)

SQL

My Process

Change Tracking

UpdateId=58,

Colour=Blue

ObjectId=58,

Colour = Red Original

ObjectId=58,

Colour = Blue

Current

Fire PropertyChanged

Notification!

Change Tracking (3)

SQL

DataContext.SubmitChanges()

My Process

Change TrackingObjectId=58,

Colour = Blue

Current

Generate SQL from List of Changes

Updates, Transactions...

LINQ Pattern from itemName in srcExpr join itemName in srcExpr on keyExpr equals keyExpr

(into itemName)?let itemName = selExprwhere predExprorderby (keyExpr (ascending | descending)?)*select selExprgroup selExpr by keyExpr into itemName query-body

DataSet/DataTable

LINQ to DataSet3

Linq to DataSet

Existing DataTable already has some query capabilities

LINQ syntax extends to DataSet to apply the same model for querying

LINQ to DataSet

Putting a few things together

Awareness:ADO.NET Entity Framework

Conceptual Models

Conceptual Design(Entities & Relationships)

Customer Order

SalesPerson

places

sells

Application(Entities & Relationships)

Relational Models

Application(Entities & Relationships)

relational schema(normalised, tables, keys)

SP's

Views

Fn's

Mapping LogicConceptual<->Relational

Application(Entities & Relationships)

SP's

Views

Fn's

Mapping LogicConceptual<->Relational

Application(Entities & Relationships)

SP's

Views

Fn's

Mapping LogicConceptual<->Relational

ADO.NETMapping Provider

Entity SQL

Object Services(Inheritance & Complex Types)

ADO.NETDatabase Provider(e.g. SqlProvider)

SQL

Application(Entities & Relationships)

LINQ Syntax

ConceptualSchema(XML)

Mapping

Schema(XML)

StoreSchema(XML)

ADO.NET Entity Framework

Do Try This At Home But...

This Talk Was Brought To You By;

The LINQ May CTPThe ADO.NET V.Next August CTP

Concepts have not changedLater CTPs have slightly altered syntaxMy CTP lacked IntelliSense

In the later builds

Summary

Powerful, intuitive LINQ patternOne "syntax" to learnRelational, hierarchical, object dataUnderpinned by new or existing API's

For Relational DataLINQ to SQL

– ORM over database schema

LINQ to Entities and the Entity Framework– ORM over conceptual model

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