linq e ef

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{ { LINQ LINQ && ADO.NET Entity ADO.NET Entity FrameworkFramework}}

C# 3.0C# 3.0C# 3.0C# 3.0 VB 9VB 9VB 9VB 9

.NET Language Integrated Query.NET Language Integrated Query

LINQ LINQ toto

ObjeObjectscts

LINQ LINQ toto

ObjeObjectscts

LINQ LINQ toto

DataDataSetsSets

LINQ LINQ toto

DataDataSetsSets

LINQ LINQ toto

SQLSQL

LINQ LINQ toto

SQLSQL

LINQ LINQ toto

XMLXML

LINQ LINQ toto

XMLXML

oggettioggetti

<book> <title/> <author/> <year/> <price/></book>

XMXMLL

Mondo Mondo relazionarelaziona

lele

ApplicazionApplicazionee

LINQ to SQLLINQ to SQL

from c in db.Customerswhere c.City == "London"select c.CompanyName

EnumeratEnumeratee

SELECT CompanyNameFROM CustomerWHERE City = 'London'

SQL QuerySQL Queryo SProco SProc

RowsRows

OggettiOggetti

db.Customers.Add(c1);c2.City = “Perugia";db.Customers.Remove(c3);

SubmitChanges()SubmitChanges()

INSERT INTO Customer …UPDATE Customer …DELETE FROM Customer …

DML DML o SProcso SProcs

• Dati == Oggetti

• Imperativo Dichiarativo

• Per oggetti, XML e Dati relazionali

• 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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