Tìm thấy 20+ kết quả cho từ khóa "Entity Framework"
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Xây dựng ứng dụng Dynamic Data với ADO.NET Entity Framework. Tạo Project Dynamic Data. Xây dựng Cơ sở dữ liệu cho Project. Tạo Data Model với ADO.NET Entity Framework. Microsoft Vietnam – DPE Team | Bài số 8: Dynamic Data với ADO.NET Entity Framework 2. Bài số 8. DYNAMIC DATA VỚI ADO.NET Entity Framework. Bài này giới thiệu cách xây dựng ứng dụng Dynamic Data với ADO.NET Entity Framework.. Để bắt đầu, File → New Web Site và chọn “Dynamic Data Entities Web Site” hay “Dynamic Data Web Site”.
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This chapter ’ s “ The Entity Framework and Entity Data Model ” section provides a brief introduction to the Entity Framework and EDM. LINQ to XML. LINQ to XML ’ s Objects. XElement , is the LINQ to XML ’ s fundamental object. Manipulating XML Documents with LINQ to XML. delivers detailed coverage of the LINQ to XML implementation.. Here ’ s the code to open an Orders document and generate an XML fragment that contains all Order elements for U.S. new XComment(“Created with LINQ to XML.
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t ứ ng d ụ ng Entity Framework.
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A Brief Tour of the Entity Framework World ...2. It’s the conceptual modeling that is the defining feature of Entity Framework and is at the heart of this book. In the text, we often show database diagrams similar to the one in Figure 0-1. Each table in a diagram is annotated (courtesy of SQL Server Management Studio) with the name of the table and the schema for the table. A Brief Tour of the Entity Framework World.
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Out of all the ORM tools I have used in the past, I always find myself using the Entity Framework above all others. I have done several presentations on the Entity Framework and every session has been packed, which tells me there is great interest in the Entity Framework by the development community. I believe that Entity Framework 4, with its new features, will be a first-class ORM and will continue to see greater use.
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Microsoft Vietnam – DPE Team | Bài số 8: Dynamic Data với ADO.NET Entity Framework 2. Bài số 8. DYNAMIC DATA VỚI ADO.NET Entity Framework. Bài này giới thiệu cách xây dựng ứng dụng Dynamic Data với ADO.NET Entity Framework.. Xây dựng ứng dụng Dynamic Data với ADO.NET Entity Framework. Tạo Project Dynamic Data. Để bắt đầu, File → New Web Site và chọn “Dynamic Data Entities Web Site” hay “Dynamic Data Web Site”.
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See Entity Framework (EF). in Entity SQL language 252. Entity Framework defini- tion of 215, 216 importing database tables. managing through ob- jects 267–278 accessing entity data. modifying entity data 271–278. Entity Framework defini- tion of 215. Entity Framework defini- tion of 216. ObjectContext class as embodiment of 268 Entity Data Model. Designer, ADO.NET about 218. Entity Data Model (EDM) adding 225. Entity Data Model Wizard .
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Modifying Entity Data Through Objects. Accessing data through properties is great, but if that is all the Entity Framework could do, it wouldn’t be a tremendous improvement over standard ADO.NET. Fortunately, the Entity Framework also supports data updates. The entity container supports updates to existing entity properties, the addition of new en- tity instances, and the removal of existing entity instances.
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Querying Data in the Framework. Describe the Entity SQL language and its purpose. Use the Entity Provider to access data based in an entity model. The Entity Framework (EF) is a markedly different way of interacting with data traditionally found in relational databases and similar external data stores. Fortunately, the Entity Framework includes a tool that helps bridge the data query gap between SQL-based systems and Framework model-based objects: Entity SQL.
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Understand the ADO.NET 3.5 Entity Framework (EF) and ADO.NET 3.5 Entity Framework Tools (EFT).. Understand the ADO.NET 3.5 Entity Data Model (EDM) and associated Item template, Wizard, and Designer.. Create and implement ADO.NET 3.5 Entity Data Model Tools to develop professional data - driven applications in Visual C# 2008 environment.
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When you create the ObjectQuery instance, the Entity Framework delays process- ing of the query until you specifically request data. Even then, it might decide to retrieve only the requested portion of the data. Note The object context and its related entity container in the conceptual model expose a LazyLoadingEnabled property. Changing this Boolean value alters the way that the Entity Framework loads data at the other end of a navigation property.
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Model focus LINQ to Entities queries focus on the Entity Framework conceptual model, which is an abstraction of the underlying logical database model. In LINQ to SQL, the model closely reflects the database tables that support it.. Overhead LINQ to SQL is extremely lightweight compared with its Entity Framework counterpart.
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The ADO.NET Entity Framework and LINQ to Enti- ties enable developers to work against a conceptual model that offers more flexible mapping, which pro- vides the capability to utilize a wider degree of variance from the underlying data source.. What determines whether a project should use LINQ to SQL or LINQ to Entities/Entity Framework?. You should use LINQ to SQL when you want the following:.
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Part III Entity Framework. 13 Introducing the Entity Framework. Understanding the Entity Framework. Defining the Entity Framework’s Terms. Understanding the Entity Framework’s Layers. Using the Entity Framework. Chapter 13 Quick Reference. Using the Entity Data Model Wizard. Working with the Mapping Details Panel. Chapter 14 Quick Reference. Chapter 15 Quick Reference. Chapter 16 Quick Reference. Using LINQ with .NET Objects. Starting a Query with the From Clause.
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RowStateFilter modifying 101 setting properties 100 RowStates 47–48 rowversion columns 195 RowVersions 48–49 RTrim function 251 rules. using XML, in Entity Framework model 218. in Entity SQL language 246–248. entity SQL equivalent of 281. Generator, ADO.NET 241. erties using 234 Sign function 323 single quotes.
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WCF Data Services provides a standardized way of exposing Entity Framework (EF) data and other ADO.NET data content to Web-based clients. REST, short for representational state transfer, provides a method of querying and updating data service content using URIs and other standardized Web-based interfaces.. Getting to Know the Service Layers. Some of them have already been covered in this book, including the Entity Framework modeling layer that provides the core access to the data.
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Entity SQL and entity-specific LINQ queries (discussed in upcoming chapters) are useful tools for accessing Entity Framework-managed data because they both provide a SQL-like experience, which is based, in part, on the desire to provide an English-like experience. Enter query builder methods.. Query builder methods are ordinary .NET extension methods that apply the subtasks of a SQL-query to an entity or to the larger entity collection.
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With .NET 4.0 we get a great Object Relational Mapping (ORM) technology in the ADO.NET Entity Framework 4.0, which will significantly simplify the effort involved to work with RDBMS from .NET applications. I have been really impressed with how the product team listened to feedback from the community on the initial release of the Entity Framework and went on to deliver significant new functionality in version 4..
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“We’re making significant investments in the Entity Framework such that as of .NET 4.0 the Entity Framework will be our recommended data access solution for LINQ to relational scenarios.”. http://blogs.msdn.com/adonet/archive update-on-linq-to-sql-and-linq-to- entities-roadmap.aspx. However, after feedback from a large number of LINQ to SQL customers, Microsoft seemed to back off on this a bit, when Tim said:. “We will continue make some investments in LINQ to SQL based on customer feedback.
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If you would like to have a little more confidence when writing your LINQ to Entities queries, you can forgo the automated conversion and decide up front which Entity Framework or database-level functions you want to include in your query.. LINQ to Entities includes a set of canonical functions which are all hosted in the System.Data.. TruncateTime maps to the Entity SQL Truncate function, which returns a date with the time portion removed..