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Borland Chief Scientist Danny Thorpe on the idea of Linq

MSDN home page for LINQ

Don Box and Anders on Linq

Stands for language integrated query. Allows SQL like queries on lists, collections etc.

Satya - Wednesday, November 09, 2005 10:19:11 AM

Current releases of dotnet environments

Visual Studio 2005
Dotnet 2.0

Previous dotnet releases

1.1
1.0

Previous visual studio releases

2003 (for dotnet 1.1)
visual studio.net  (for dotnet 1.0)

Satya - Wednesday, November 09, 2005 10:20:40 AM

What visual studio.net is required to linq?

What releases of dotnet and visual studio.net do I need to run linq. There is availability of linq against 2005. What about previous versions?

Satya - Wednesday, November 09, 2005 10:24:52 AM

Primary topics in linq

Linq proper
xlinq for xml
dlinq for databases

Satya - Wednesday, November 09, 2005 10:34:36 AM

General ideas in linq

Motivation for linq
history of linq
Language based queries
working with collections
filters
projections
key extraction
lambda expressions
expression trees
duck typing
extension methods
late binding and defered evaluation
compound values
anonymous types
sorting and grouping
Aggregation
select and select many
General Operators
   Where, 
   Select, 
   SelectMany, 
   GroupBy, 
   OrderBy, 
   ThenBy, 
   OrderByDescending, 
   and ThenByDescending. 
Online resources
   mailing lists
   web logs
   tutorials

Satya - Wednesday, November 09, 2005 12:34:41 PM

Xlinq topics

A new programming API for XML
functional construction
Relationship to linq
Relationship to DOM, XQuery, Xpath
New language objects in xlinq
xling class diagram
document free
Better support for namespaces
A conceptual approach to xml programming
Reading xml files
In memory xml initialization
XML navigation in xlinq
Manipulation xml: insert, delete, update
Attribute treatment
xml printing
Querying xml
   standard
   extended
Transformations
Working with databases

Satya - Wednesday, November 09, 2005 12:59:46 PM

DLinq topics

A brand new facility for data access
Relationship to object databases
Relationship to Entity beans in EJBs
Relationship to o/r mapping tools: Hibernate
   Inheritance
   Mapping
   Data binding
   Concurrency
   Transactions
Advances over ADO
Attributes for mapping
Data context: defining your databases
Foreign keys
joins
Saving
c# as your T-sql
Defered execution
Object identity
Projections
Concurrency
Transactions
Events or specializing the updates
Main Attributes
Relational integrity
Change notifications
Tools: Auto generation of classes from schema
Integration with xml

Satya - Monday, November 14, 2005 9:54:40 AM

A fundamental requirement of linq

operates on IEnumerable types

Satya - Monday, November 14, 2005 9:57:26 AM

hard wired binding to database tables

At the moment in dlinq the tables are hard wired in your code.

Satya - Monday, November 14, 2005 10:03:16 AM

The underlying pillars of linq

Generics
anonymous methods

Satya - Monday, November 14, 2005 10:13:29 AM

The soul of linq

A language integrated query would use the metadata of a compiled language like c#. Implication is that an ensuing query should take advantage of the following

metadata
compile time syntax checking
static typing
intellisense

Potentially this could be reflection on steroids. Or could play the role of what "system tables" in relational databases.