microsoft ado net entity framework code first

... an empty solution Getting Entity Framework Code First From CodePlex The second option, for advanced users, is to clone the Entity Framework Code First repository on CodePlex, build the binaries ... Chapter 1 Setting Up 11 Before We Start 11 Getting Entity Framework Code First From NuGet 11 Getting Entity Framework Code First From CodePlex 11 Configuring the Database 12 Chapter 2 ... Server, create a new database called Succinctly Getting Entity Framework Code First From NuGet NuGet is to NET package management what Entity Framework is to data access In a nutshell, it allows

Ngày tải lên: 12/07/2014, 17:15

... (WPF) Trang 21CHƯƠNG II: TÌM HIỂU ENTITY FRAMEWORK 5.0 II.1 Tổng quan về Entity Framework II.1.1 Giới thiệu về Entity Framework Microsoft® ADO.NET Entity Framework là một bộ ánh xạ đối tượng ... tiếp với ADO.NET data provider để gửi hoặc nhận dữ liệu EntityClient sử dụng Entity SQL để truy vấn ADO.NET Data Provider Là layer giao tiếp với cơ sở dữ liệu theo tiêu chuẩn ADO.Net EntityDataReader ... trên NET Framework có thể tích hợp với bất kì mã nào .NET Framework bao gồm bộ thực thi ngôn ngữ chung (Common Languge Runtime - CLR) và lớp thư viện NET Framework (FCL) CLR là nền tảng của NET Framework

Ngày tải lên: 27/11/2021, 09:06

... the standard controls provided with Visual Studio Chapter 21, “Binding Data with ADO.NET,” discusses the ADO.NET-specific features of this control. Querying and Sorting Data In Chapter 3, “Storing ... records to a DataTable is important, the real value of ADO.NET lies in get-ting those records back out in a variety of ways Fortunately, the data framework includes many different methods and tools ... Trang 156 Microsoft ADO NET 4 Step by Step3 Locate the CustomerAccounts_RowChanging event handler, which is called

Ngày tải lên: 05/07/2014, 19:20

... DataSet("SetName") Trang 974 Microsoft ADO NET 4 Step by StepAdding a name to a standalone DataTable instance might be inconsequential, but some table-related features in ADO.NET do enable access to ... the types of table constraints available in ADO.NET ■ ■ Build relationships that auto-correct linked rows when needed The DataTable class provides ADO.NET’s core data-management functionality But ... table, you can query expression columns in Select statements or examine them with standard ADO.NET code just like static columns Expression columns are not calculated until you attempt to access

Ngày tải lên: 05/07/2014, 19:20

... " & ex.Message) Return End Try Trang 994 Microsoft ADO NET 4 Step by StepThe code performs the calculation in a Try block because the code that built the ex-pression didn’t bother to ... Trang 186 Microsoft ADO NET 4 Step by Step6 Test setting linked child fields to NULL when a parent record is deleted Set the Delete Rule field to SetNull Select the first row in the Flights ... covered in earlier chapters This chapter introduces the data-aggregation features included in the ADO.NET Framework, expressions that summarize data across multiple table rows Although not as powerful

Ngày tải lên: 05/07/2014, 19:20

... Trang 1106 Microsoft ADO NET 4 Step by StepSummary This chapter introduced two ADO.NET features that enhance its core functionality: aggre-gates ... other XML-enabled application ADO.NET includes full schema definition support using Schema Definition Language (XSD) Note Before version 4, ADO.NET included an XmlDataDocument class that supported ... DataSet is even easier because ADO.NET will guess at the correct structure of the data even if you don’t provide table design guidance Trang 3108 Microsoft ADO NET 4 Step by StepWriting XML To

Ngày tải lên: 05/07/2014, 19:20

... strings ■ ■ Write code that connects to an external data source ■ ■ Identify the different data providers included in ADO.NET The first seven chapters of this book demonstrated many ADO.NET features ... other ways to bring ADO.NET data and XML together in your applications LINQ, a major language feature in both Visual Basic and C#, includes data-querying features for both ADO.NET and XML, features ... built into ADO.NET classes These features exist primarily to assist in serializing static XML content for disk-based storage or for transfer to other applications that expect ADO.NET-generated

Ngày tải lên: 05/07/2014, 19:20

... data management between ADO.NET and external data sources Note ADO.NET includes an “Entity Client” provider that enables provider-like functionality to the new ADO.NET Entity Framework system It ... System. Data.SqlClient namespace. Note Prior to version 4 of ADO.NET, Microsoft also included a functional Oracle provider with the NET Framework This provider, stored in the System.Data.OracleClient ... enable access to more third-party database systems and file formats The ADO.NET Framework comes with three providers: ■ ■ The Microsoft SQL Server provider, expressed through the System.Data.SqlClient

Ngày tải lên: 05/07/2014, 19:20

... 6 Open the source code view for the StateBuilder form Locate the RefreshEverything routine Just after the “See if a custom state already exists” comment, add the following code: sqlText = "SELECT ... (sqlText) and a connection (linkToDB) If the reader contains at least one row, the code accesses specific fields in that first row to populate various internal and onscreen values Trang 37 Run the program, ... 6 Open the source code view for the StateBuilder form Locate the RefreshEverything routine Just after the “See if a custom state already exists” comment, add the following code: sqlText = "SELECT

Ngày tải lên: 05/07/2014, 19:20

... needed, and adding it to the SqlCommand.Parameters collection When you execute the command, ADO.NET passes both the placeholder-laden SQL text and the parameter collection to the database for ... require specific preci-sion and scale values Use these properties to configure the data from ADO.NET’s point of view ■ ■ Size Similar to Precision and Scale, Size is commonly used for text and ... the direction of a parameter The SqlParameter class in-cludes a Direction property that tells ADO.NET which way data flows from your query’s data value to the stored procedure There are four available

Ngày tải lên: 05/07/2014, 19:20

... these components working on a single database table, Customer. Trang 5170 Microsoft ADO NET 4 Step by StepDatabase ADO.NET Customer DataAdapter SELECT Fill Update INSERT UPDATE DELETE DataReader ... experience provided by ADO.NET revolves around the DataSet class and its supporting objects The last few chapters have introduced ways to access external data with ADO.NET, but none of those ... Trang 1166 Microsoft ADO NET 4 Step by Step4 Just after the “Read the next set, which contains the orders” comment, add the follow-ing code: customerReader.NextResult()

Ngày tải lên: 05/07/2014, 19:20

... implementation, and be aware of changes to ADO.NET in future releases that might affect your use of such statements. Using Local Transactions ADO.NET includes support for transactions with a ... record updates to be treated as a single unit This chapter introduces ADO.NET’s take on the trans-action and how your code can work with the database to ensure safe and sound data Note The exercises ... platform-specific statements: SELECT, INSERT, UPDATE, and DELETE, or their stored procedure equiva-lents ADO.NET includes the SqlCommandBuilder tool to assist you in developing at least some of these statements

Ngày tải lên: 05/07/2014, 19:20

... transaction’s overall changes. 204 Microsoft ADO.NET 4 Step by Step Using Distributed Transactions The .NET Framework includes support for distributed transactions through the Microsoft Distributed Transaction ... occur through the System.Transactions.TransactionScope class. This class is not part of ADO.NET, but ADO.NET does include automatic support for it when you use it in your application. To access ... all relevant ADO.NET commands here. Visual Basic Imports System.Transactions ' Later Using envelope As TransactionScope = New TransactionScope() ' Include all relevant ADO.NET commands

Ngày tải lên: 05/07/2014, 19:20

... associated NET Framework version 3.5), Microsoft enhanced ADO.NET with a library of additional function-ality known as the Entity Framework (EF) The question is this: Why? Why would Microsoft ... and parallel elements in the Entity Framework ADO.NET has been included with the NET Framework since its initial release in 2002 As the primary data layer of the Framework, it provides great ... TransactionScope object’s Dispose method. Trang 6Microsoft ADO NET 4 Step by StepPart III Entity Framework Trang 8Chapter 13Introducing the Entity Framework After completing this chapter, you will

Ngày tải lên: 05/07/2014, 19:20

... access to related data ■ ■ Entity set An entity set is the logical container for an entity and any other entities de-rived from that first entity For example, a PastDueOrder entity definition and ... Classes generated by the Framework implement in code the entities, properties, and associations defined in the model Understanding the Entity Framework’s Layers In the Entity Framework, you define ... chapter provided an overview of the major concepts in ADO.NET’s new Entity Framework functionality Although much more complex than the ADO.NET class library that enables it, EF is also much more

Ngày tải lên: 05/07/2014, 19:20

... To add a custom code generator to your project, use Visual Studio’s Project | Add New Item menu command, and choose either ADO.NET EntityObject Generator or ADO.NET Self-Tracking EntityObject Generator ... search for “Generated Code Overview” within the Visual Studio online help Summary This chapter continued the overview of the Entity Framework by introducing the ADO.NET Entity Data Model Designer ... querying EF data: retrieving entity data using Entity SQL and accessing objects directly through the Entity Framework’s Object Services layer Trang 8Add a new Entity Framework model to a project

Ngày tải lên: 05/07/2014, 19:20

... updates are needed, the standard Entity Framework tools take over ■ ■ None of the batch query or stored procedure functionality found in T-SQL is available in Entity SQL Entity SQL does include support ... T-SQL focuses on the logical tables and rows in the database Even when an Entity Framework model targets a SQL Server database, Entity SQL queries focus on the data as expressed through the conceptual model Writing Basic Queries Entity SQL selection ... exist as collections of table-row instances The custom Entity SQL features directly address these and other Entity Framework enhancements In Entity SQL, the entities being queried and the results

Ngày tải lên: 05/07/2014, 19:20

... included with the Entity Framework, this is a small omission But if you need to push entity data into a standard ADO.NET structure, you will have to do so manually When using the EntityCommand.ExecuteReader ... and then ultimately through a provider such as the SQL Server ADO.NET provider The Entity Framework hosts its own data provider: the EntityClient provider This provider exposes much of the same ... additional ways that Entity Framework data can be accessed within your software and your business logic Trang 10Select entity records using Entity SQL Write your query using the Entity SQL language.

Ngày tải lên: 05/07/2014, 19:20

... chapter) that act as collections for named or anonymous entity types Trang 5280 Microsoft ADO NET 4 Step by StepConsider this simple Entity SQL statement that selects a few fields from Customer ... the entity by ID. Trang 9284 Microsoft ADO NET 4 Step by StepUsing Query Builder Methods: Visual Basic Note This exercise continues the previous exercise in this chapter. 1 Open the source code ... Microsoft ADO NET 4 Step by StepNote At this point, the Delete button on the CustomerEditor form does not work The example that appears later in this chapter on page 284 adds the necessary code

Ngày tải lên: 05/07/2014, 19:20

... provider endows ordinary ADO.NET DataTable objects with the ability to participate fully in LINQ queries It does this by adding the necessary LINQ requirements to relevant ADO.NET classes This chapter ... ■ Prepare a DataTable instance so that it uses the IEnumerable interface ■ ■ Treat ADO.NET table values as first-class members of a LINQ query ■ ■ Cast type-neutral column values as strongly ... that integrate into LINQ queries as first-class processing features The next three chapters delve deeper into the specific flavors of LINQ that pertain to the ADO.NET experience Trang 9Join two collections

Ngày tải lên: 05/07/2014, 19:20