Linq e Ef

Pietro Brambati Microsoft blogs.msdn.com/pietrobr { LINQ & ADO.NET Entity Framework }

C# 3.0 VB 9 .NET Language Integrated Query LINQ to Objects LINQ to DataSets LINQ to SQL LINQ to XML oggetti <book> <title/> <author/> <year/> <price/> </book> XML Mondo relazionale

Enumerate SQL Query o SProc Rows Oggetti SubmitChanges() DML o SProcs Applicazione LINQ to SQL from c in db.Customers where c.City == "London" select c.CompanyName SELECT CompanyName FROM Customer WHERE City = 'London' db.Customers.Add(c1); c2.City = “Perugia"; db.Customers.Remove(c3); INSERT INTO Customer … UPDATE Customer … DELETE FROM Customer …

Dati == Oggetti

Imperativo  Dichiarativo

Per oggetti, XML e Dati relazionali

ObjectContect

Represents a Connection to an Underlying Data Store

ObjectQuery<T>

Represents a Command to be Executed Against an Entity Data Model

Data Classes

Represent Entities

ObjectServices: Objects Over Entities

API for Programming Against Entity Data Models

Query: Two Approaches

LINQ: Language Integrated Query

Entity SQL

Text-Based Query

Query Builder Methods

LINQ to * : un approccio unificato per l’accesso a sorgenti dati eterogenee

ADO.NET EF: il modello concettuale per sviluppare…

LINQ to Entites : LINQ per EF

LINQ to SQL e LINQ to Entities sono pensati per diversi scenari

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