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would throw an exception because it must match column names:using (varnew schooldbentities ()) { //This wouldthrow an exception var studentname = ctx. Students.sqlquery ("from where studentname='New Student1' "). ToList ();}SQL query for non-entity types:A SQL Query Returning instances of any type, including primitive types, can
Entity Framework tutorial -- Entity type in Entity Framework, entityframework Entity types in Entity F
the database and to return it back. Object Service is responsible for materialization, which are the process of converting data returned from an entity client Data provider (next layer) to an entity object structure.Entity Client Data Provider: The main responsibility of this layer are to convert L2E or Entity SQL queries into a SQL
Entity Framework tutorial -- What is Entity Framework, frameworkentity What is Entity Framework? Writing and managing ADO. NET is a tedious and boring task. Microsoft provides an ORM
What is the entity FrameworkWriting and managing ADO is a tedious and boring task. Microsoft provides an ORM framework called "Entity Framework" for your app to automate the management of your database.Microsoft has given the following definition to the Entity Framework:EF i
objects and Mapping information on how Domain OB Jects map to relational database objects (tables, views StoredProcedures). ORM allows us to keep the database design separate from our domain class design. This makes the application maintainable and extendable. It also automates standard CRUD operation (Create, Read, Update Delete) so that the developer doesn ' t need to write it manually.A Typical ORM tool generates classes for the database interaction for your application as shown below.Visi
Entity Framework tutorial -- install Entity Framework environment, entityframework Install the Entity Framework Environment Entity
Label:3-4 using the Entity SQL query modelProblem You want to query your Entity Data model and return strongly typed objects by executing an Entity SQL statement. Solution Solutions Suppose you have the model shown in Figure 3-5, which contains a customer
Installing the Entity Framework EnvironmentThe Entity Framework 5.0 API is distributed in two locations, one can be found in the NuGet Package Manager, and one exists in the. NET Framework. NET Framework 4.0/4.5 contains the EF co
From the blog Park development team to develop frontline news:In the Entity Framework, if entity A is associated with entity B, you want to load entity B while loading entity a. It is common practice to use include () in LINQ quer
Description of Entity notes corresponding to the automatic association query and automatic association update navigation properties of Entity Framework, entityframework I. First, I want to know about the automatic association query of En
Http://www.cnblogs.com/dudu/archive/2012/04/13/entity_framework_include_where.htmlIn the Entity Framework, if entity A is associated with entity B, you want to load entity B while loading entity a. It is common practice to use inc
Validate EntityYou can write the custom server side validation for any entity. To accomplish this, override validateentity method of DBContext as shown below.protected OverrideSystem.Data.Entity.Validation.DbEntityValidationResult validateentity (Dbentityentry entityentry, system.collections.generic.idictionaryObject,Object>items) { if(entityentry.entity isStudent) { if(entityentry.currentvalues.getvaluestring> ("Studentname") =="") {
Entity Framework 4.1: bypasses EF query ing, entityframework Original article name: Entity Framework 4.1: Bypassing EF query mapping (8) Address: http://vincentlauzon.wordpress.com/2011/04/21/
The problem of Cross-database query of Entity Framework is solved, and the modernization of the blog Park is another step forward. In the previous article,The modernization of the blog Park-automapperWe have encountered an application scenario where the number of fields returned by the database query is less than the
Based on. NET Microsoft ORM Framework Video Tutorial (Entity framework Technology)First Speaking ORM MappingSecond, the first knowledge entifyframework frameThird, LINQ expression queryThe four-way LINQ method queryV about LINQ to EntitiesSix talk ObjectQuery query (UP)Seven
Transferred from Andrew's blog to the Entity Framework-query across Context Http://columns.chicken-house.net/post/e99ba3e6909ee79a84-Entity-Framework-e8b7a8e8b68a-Context-e79a84e69fa5e8a9a2.aspx First of all, I would like to express my gratitude to the author. below i
In the previous article, I mentioned that "for cross-database queries, we have not found a method implemented through LINQ to entities ". Later I think about it. Theoretically speaking, it is not difficult to implement cross-database queries. Compared with non-Cross-database queries, I only have one more database name, for example, the following non-Cross-database query statement: Select[Text]FromDBO. blog_postbodyWhereID=3560 Cross-database
Entity Framework Tip 4-how to use notracking to query objects in the detached state? Sometimes our entities only need to be displayed without updating, so to improve performance, we do not need to beContext tracing. In this case, you can use the notracking query to obtain the object, so that the object state will be de
The Entity Framework (EF) accesses the Entity in three different ways. LINQ to Entities Direct access through LINQ to completely separate the program from the database, and LINQ automatically uses the object service for database operations internally Object Service The entity can be acce
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