LINQ for SQLSQL Saturday May 2009

David Fekke

Who am I?

•David Fekke

•davidfekke@gmail.com

•Software Engineer at LPS

•Reformed DBA/Sharepoint developer

•JaxFusion.org

LINQLanguage Integrated

Query

ORMor

Object Relational Mapper

.NET 3.5 Framework

SQL vs. LiNQ

Abstraction

SQL Server 2005/8

•MySQL

•PostgreSQL

•Other RDBMS supported by Open Source

Oracle ProviderThrough DevArt

IQueriable Interface

•Query Objects

•Query XML

•Query Databases

var myQuery = from p in db.people where p.firstname == “David” select p

LINQ makes use .NET 3.5

language features

C# 3.0VB .NET 9.0

Lamda ExpressionsAnonymous Types

Dynamic Types

Pros and Cons• Visual Studio Generates Object code

•No reason to create separate queries for each RDBMS

• Auto parametrize variables

•Use Stored Procedures

•No hinting

• careful about in memory querying

• SQL Statements are auto-generated with the exception of Stored Procs