1. Advances for Data in VS “Orcas”
Mike Taulty
Developer & Platform Group
Microsoft Ltd

2. Barriers Between Code & Data
Relational
XML
"The Data Barrier"
My Code
Object
Objects
Metadata
Type Safety
Compile time checking
IntelliSense

3. Today - "String in", "Object Out"
Relational
XML
We get back an opaque data type
XmlNode
DataTable, DataReader
Metadata
Type Safety
Compile time checking
IntelliSense
We solve the problem with a string...
"/descendant-or-self/..."
"SELECT * FROM ..."
"The Data Barrier"
My Code

4. These errors show up at runtime, not compile time
Today - Illustrated
These errors show up at runtime, not compile time

5. Tomorrow - Query in the Languages
The Language Integrated Query Pattern
 from itemName in srcExpr
 join itemName in srcExpr on keyExpr equals keyExpr
(into itemName)?
let itemName = selExpr
where predExpr
orderby (keyExpr (ascending | descending)?)*
select selExpr
group selExpr by keyExpr 
into itemName query-body
Relational
XML
Object
Objects

6. Taking LINQ to Common Data Stores
Objects
XML
SQL
DataSet 1 2 3

7. LINQ over XML 1 LINQ Pattern New XML API from itemName in srcExpr
 join itemName in srcExpr on keyExpr equals keyExpr
(into itemName)?
let itemName = selExpr
where predExpr
orderby (keyExpr (ascending | descending)?)*
select selExpr
group selExpr by keyExpr 
into itemName query-body
New XML API

8. System.Xml.Linq New XML API (more DOM than reader)
Key classes: XElement, XAttribute

9. LINQ over XML

10. Object Relational Mapping API
LINQ to SQL 2
LINQ Pattern
 from itemName in srcExpr
 join itemName in srcExpr on keyExpr equals keyExpr
(into itemName)?
let itemName = selExpr
where predExpr
orderby (keyExpr (ascending | descending)?)*
select selExpr
group selExpr by keyExpr 
into itemName query-body
Object Relational Mapping API
Code Gen Tools

11. System.Data.Linq – Data API

12. LINQ to SQL

13. LINQ to DataSet 3 LINQ Pattern DataSet/DataTable FirstName LastName
 from itemName in srcExpr
 join itemName in srcExpr on keyExpr equals keyExpr
(into itemName)?
let itemName = selExpr
where predExpr
orderby (keyExpr (ascending | descending)?)*
select selExpr
group selExpr by keyExpr 
into itemName query-body
FirstName
LastName
Age
Height
Fred
Smith 55
1.2
Jim
Jones 22
1.3
John
Doe 43
1.4 Jo
Blogs 17
1.5
DataSet/DataTable

14. Linq to DataSet Existing DataTable already has some query capabilities
LINQ syntax extends to DataSet to apply the same model for querying

15. LINQ to DataSet

16. Summary Powerful, intuitive LINQ pattern For Relational Data
One "syntax" to learn
Relational, hierarchical, object data
Underpinned by new or existing API's
For Relational Data
LINQ to SQL
ORM over database schema
LINQ to DataSet

17. roadshowresources.com