Bienvenidos

Language Integrated Query – LINQ: Nuevos paradigmas en el acceso a datos Oscar J. Berroterán MCP, MVP Visual Basic,Ineta Academic Speaker, MS Andean Speaker Group ojberroteran@gmail.com http://msmvps.com/blogs/oberroteran http://blogs.comunidadesandinas.com/blogs/oberroteran

Agenda Pasado, presente y futuro Objetivos Presentando LINQ Demos

.Net a través del tiempo 2002 2003 2005 2006 2008¿? Tool (Visual Studio) VS .NET 2002 VS .NET 2003 VS .NET 2005 + Extensiones (WPF, WWF,..) Visual Studio 2008 Codename Orcas Lenguajes C# v1 VB .Net v7 C# v1.1 VB .Net v7.1 C# v2 VB 2005 (v8) C# v3 VB .9 Framework NetFx v1.0 NetFx v1.1 NetFx v2.0 NetFx v3.0 NetFx v3.5 Engine (CLR) CLR v1.0 CLR v1.1 CLR v2.0 ¿?

Evolución de acceso a datos en .Net WPF,WCF, WWF .Net 3.0 .Net 2.0 Generics ADO .Net Factory objects .Net 1.0 ADO .Net , Datasets (desconectado), Componentes administrados

El concepto … “El concepto LINQ es la idea de aportar al .Net Framework la capacidad de creación, generación y ejecución de un modelo de consulta sobre cualquier tipo de información en memoria.” Datos Objetos != Orientación a objeto, polimorfismo, interfaces, herencia… Proyecciones, agrupaciones, claves foráneas, joins…

Objetivos de LINQ Integración de datos Adicional Objetos Datos Relacionales XML Adicional Mejorar la consistencia de los lenguajes Añadir funcionalidad No atar el lenguaje a un API especifico Mantener la compatibilidad hacia atras

Objetivos de LINQ Simplificar la búsqueda de información Integrar búsquedas y transformaciones Unificar el proceso de búsqueda en diferentes fuentes de información Simplificar el trabajo con XML Producir docs. XML rápidamente Accecer a los miembros de un doc. XML fácilmente

mmm, ¿Cómo? Sintaxis LINQ From C in Clientes Where c.Ciudad = “Maracay” Select new { c.Nombre, c.Apellido}; Sintaxis SQL Select C.Nombre, c.Apellido from Clientes As c where c.Ciudad=“Maracay”;

Presentando Language Integrated Query (LINQ) C# VB Others… .Net Language Integrated Query (LINQ) LINQ enabled data sources LINQ to ADO.NET LINQ To Objects LINQ To Datasets LINQ To SQL LINQ To Entities LINQ To XML <book> <title/> <author/> <price/> </book> Objects XML Relational

¿Que hay detrás de esto? Mejoras del lenguaje = L I N Q (Inferencia de tipos Inicializadores de objetos Tipos anónimos Expresiones Lambda (funciones en línea) Extension Methods) + Query Expressions = L I N Q

Sintaxis From id in Source {From id in Source| Cero o más From, join, let, where u orderby Comienza con From From id in Source {From id in Source| Join id in Source on expr equals expr [into id]| Let id = expr| where condition | Orderby ordering, ordering,…} Select expr | group expr by key Into idquery Termina con Select o groupby Continuación opcional into

Local Variable Type Inference El tipo de la variable se determina del proceso de inicialización Dim i=666 Dim s = “UCAB” Dim d = 3.14 Dim numbers = new int() {1,2,3,4}

Object Initializers Dim oPunto as Punto = New Punto oPunto.X=10 Public Class Punto Private mX as integer Private mY as integer Public Property X as Integer Get Return mX end get Set (ByVal value as Integer) mX=value end Set End Property End Class Dim oPunto as Punto = New Punto oPunto.X=10 oPunto.Y=20 Dim Opunto as Point = New Point With {.X=10, .Y=20}

Lambda Expresions Una expresión lambda es una función sin nombre que calcula y devuelve un solo valor. Las expresiones lambda se pueden utilizar dondequiera que un tipo del delegado sea válido. Método Clase real X=Paises.GetAll.Where(Function (a as Paises) a.Id =1) Ext. Method

Anonymous Types Class XXX Public Nombre as String Public Tipo as Integer End Class XXX Dim OCliente = New With {.Nombre=“Oscar”, .Tipo=20}

12/7/2017 4:44 AM Extension Methods Los métodos de extensión permiten, a partir de la creación de clases, extender tipos existentes con nuevas funcionalidades (métodos). En VB9 sólo estan permitidos a nivel de módulos <System.Runtime.CompilerServices.Extension()> _ Public Function Concatenar(ByVal values as Ienumerable(of Integer), ByVal separador as String) as String Dim st as String = String.Empty For Each i as Integer in Values st= st + i.ToString + separador next return st End Function © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

demo Linq to Objects 12/7/2017 4:44 AM © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Language INtegrated Query 12/7/2017 4:44 AM Language INtegrated Query C# VB Others… .Net Language Integrated Query (LINQ) LINQ enabled data sources LINQ enabled ADO.NET LINQ To Objects LINQ To Datasets LINQ To SQL LINQ To Entities LINQ To XML <book> <title/> <author/> <price/> </book> Objects XML Relational © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

12/7/2017 4:44 AM demo Linq to SQL © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Recursos Visual Studio 2008 LINQ Forum LINQ project 12/7/2017 4:44 AM Recursos Visual Studio 2008 http://msdn2.microsoft.com/en-us/vstudio/ LINQ Forum http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=123&Si teID=1 LINQ project http://msdn2.microsoft.com/en-us/vbasic/aa904594.aspx Blogs http://msmvps.com/blogs/oberroteran http://geeks.ms/blogs/oberroteran http://blogs.msdn.com/vsdata/ http://blogs.msdn.com/vbteam/ © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

12/7/2017 4:44 AM GRACIAS !!! © 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.