Data Developer Center > Learn > Entity Framework > Get Started > Loading Related Entities Loading Related Entities Entity Framework supports three ways to load related data - eager loading, lazy loading and explicit loading. The techniques sho…

Spatial Data type support in Entity Framework 5.0 MS SQL Server 2008 introduced two spatial data types, geography and geometry. Geography represents data in a round-earth coordinate system and geometry represent data in a Euclidean (flat) coordinate…

Entity Framework允许控制对象之间的关系,在使用EF的过程中,很多时候我们会进行查询的操作,当我们进行查询的时候,哪些数据会被加载到内存中呢?所有的数据都需要吗?在一些场合可能有意义,例如:当查询的实体仅仅拥有一个相关的子实体时可以加载所有的数据到内存中.但是,在多数情况下,你可能并不需要加载全部的数据, 而是只要加载一部分的数据即可. 默认情况下,EF仅仅加载查询中涉及到的实体,但是它支持两种特性来帮助你控制加载: 1.贪婪加载 2.延迟加载 下面以客户类型.客户和客户邮件三个实…

MS SQl Server引进两种特殊的数据类型geography and geometry public partial class Course { public Course() { this.Students = new HashSet<Student>(); } public int CourseId { get; set; } public string CourseName { get; set; } public Nullable<int> TeacherId {…

场景再现 我需要查询公司名称包含给定字符串的公司,于是我写了下面的测试小例子: var condition = "测试"; var query = from b in db.Companies where (condition == null || condition == "") ? true : b.Name.Contains(condition) orderby b.CompID select new { CompID = b.CompID, Name = b…

Eager Loading: Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved using the Include() method. In the following example, it gets all the students from the dat…

Creating Entities First of all, Let's create some entities to have a test. Create a project Add following packages by NuGet EntityFramework MySql.Data.Entity (I'm just using MySql, it's not necessary) Add some codes: class Class { public int ClassId…

本文转自:https://msdn.microsoft.com/zh-cn/library/gg190738 Julie Lerman http://thedatafarm.com April 2011 As part of Microsoft’s Azure platform, SQL Azure is your relational database in the cloud. In fact, SQL Azure is very close to being SQL Server in t…

EF产生的背景: 编写ADO.NET访问数据的代码,是沉闷而枯燥的,所以微软提供了一个对象关系映射框架(我们称之为EF),通过EF可以自动帮助我们的程序自动生成相关数据库. Writing and managing ADO.Net code for data access is a tedious and monotonous job. Microsoft has provided an O/RM framework called "Entity Framework" to autom…

1.什么是EntityFramework? http://www.entityframeworktutorial.net/what-is-entityframework.aspx Writing and managing ADO.Net code for data access is a tedious乏味 and monotonous单调 job. Microsoft has provided an O/RM[object relational mapping]对象关系映射 framework…