entity framework data access layer example

1. When selecting datasource in my environment vs2008 sp1.entity Data Model Wizard, the Acess database cannot be selected. Is the acess Entity Data Model currently unavailable. On the contrary, you can use LINQ to SQL. 2. What are the advantages of ADO. NET Entity compar

stored in the XML file, more conducive to the expansion or modification of the system. But the premise is that we need to provide it with a dedicated SQL statement management tool. The use of SQL statements can not be avoided, how to better apply the SQL statement is inconclusive, but there is a principle worthy of our adherence, that is, "should try to make the SQL statements in the data access

is no final conclusion on how to better apply SQL statements. However, there is a principle that deserves our attention, that is, "try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM framework provides basic se

;}public string Name {get; set;}public int CompanyID {get; set;}Public virtual icollectionPublic virtual company company {get; set;}}public class Appointment{public int Appointmentid {get; set;}Public System.DateTime appointmentdate {get; set;}public string Patient {get; set;}public int Doctorid {get; set;}Public virtual Doctor Doctor {get; set;}}Next, in Listing 13-7, we create a way to access EF in Codefirst mode, DbContext objectListing 13-7. DbCon

statements cannot be avoided, and there is no final conclusion on how to better apply SQL statements. However, there is a principle that deserves our attention, that is, "try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM

In this article, I'll explain the use of the Entity Framework (with Windows Communication Foundation (WCF) RESTful services exposed and secured by Windows Azure Access Control Service (ACS)) to implement an Open Data protocol (OData )。 Like most developers, I often find myself trying to use a variety of new methods to

statements cannot be avoided, and there is no final conclusion on how to better apply SQL statements. However, there is a principle that deserves our attention, that is, "try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM

, and there is no final conclusion on how to better apply SQL statements. However, there is a principle that deserves our attention, that is, "try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM framework provide

statements. However, there is a principle that deserves our attention, that is, "try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM framework provides basic select, insert, update, and delete operations for

layer.". Of course, if ORM is applied, everything will be different. The ORM framework provides basic select, insert, update, and delete operations for data access. For example, in nhibsion, we can directly call the Save method of the isession object to insert (or create)

worth observing, that is," Try to make SQL statements exist in the specific implementation of the data access layer ". Of course, if ORM is applied, everything will be different. The ORM framework provides basic select, insert, update, and delete operations for data

Enable Entity Framework to stop private access to sys. databases and sysdatabases Here, "Private sys. databases" refers to the default query initiated by Entity Framework: SELECT Count (*) FROM sys. databases WHERE [name] = n' database name' Note: This article is intended fo

In the Entity Framework, you can use lambda expressions to query data, and you can map query results directly to objects or object lists, which greatly improves development speed and makes data-tier data easier to process and deliver. But a lot of times, we do not need the w

The data entity layer is used to encapsulate the data structure of an entity class. It is generally used to map data tables or views of a database to describe objects that exist objectively in the business.When designing the