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 is the text, and I hope he can help you.
The previous article has written about the basic development of the project and the project used some things, this article began to design the entity model, well, nonsense not much to say.
Entity model base Class
Because each model entity needs to have a number, state these basic things, in order to adhere to the MVC
ADO. NET Entity Framework is an entity framework introduced by. NET Framework 3.5 SP1. It allows developers to focus on data through the Object Model (rather than the logical/Relational Data Model. The Entity
Original article name: Entity Framework 4.1: failed to define relationships (5)
Address: http://vincentlauzon.wordpress.com/2011/04/15/entity-framework-4-1-many-to-many-relationships-5/ We can see the English tutorial recommended for Entity
The Microsoft platform has been written for a few years, with the continuous evolution of Microsoft Data access technology, I have used the ODBC, DAO, ADO, ADO, LINQ to SQL, Entity framework technologies in the program.In recent years, the role of the Entity Framework (hereafter referred to as EF) has risen, becoming t
Entity Framework 6 Recipes Chinese translation series (36), entityframeworkFor the original intention of translation and why I chose Entity Framework 6 Recipes, see section 6-12 TPC inheritance ing modeling at the beginning of this series.
Problem
You have two or more tables with data similar architectures. You want
Entity Framework 6 Recipes translation Series 3, entityframeworkChapter 2 basis of Object Data Modeling
It is very likely that you start to explore the Entity Framework. You may ask "How do we start ?", If this is the case, this chapter is a good start. If not, you have already modeled and feel good about
Learning the Entity Framework technology during the review of excellent articles, for the sake of convenient access later, reproduced to the blog, can read the original: http://blog.csdn.net/bitfan/article/details/12779517The Microsoft platform has been written for a few years, with the continuous evolution of Microsoft Data access technology, I have used the ODBC, DAO, ADO, ADO, LINQ to SQL,
Entity Framework 6 Recipes Chinese translation series (19), entityframework
For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.3-16 bitwise operations in Filtering
Problem
You want to use bitwise operation
key concepts of the object framework: Extended query model using LINQ and new asynchronous functions implemented in Entity Framework 6.
For the vast majority of query operations, you need to use LINQ. This will bring you smart prompts, compile-time checks, and a strong programming experience. If you need to dynamicall
Original article name: Entity Framework 4.1: Optimistic Concurrency (6)
Address: http://vincentlauzon.wordpress.com/2011/04/17/entity-framework-4-1-optimistic-concurrency-6/ We can see the English tutorial recommended for Entity Framew
to support different databases. (Of course, Microsoft still only has built-in SQL Server Provider and other database providers, third-party development is required ). EF and linq. This is. net development ,. net programmers operate data in object mode and query data in programs using SQL-like syntax, which greatly reduces the tedious work of constructing SQL statements and can focus more on writing business logic code. However, in a distributed application system with multiple layers of archite
0 Abstract
This article describes how to debug the source code of Entity Framework 6 (EF 6) in Visual Studio 2013 (vs 2013. In principle, vs 2012 is also applicable.
This code ant was planning to write a series of blog posts in "Entity Framework 6 Source Code debugging and analysis". due to personal health reasons, it
objectspace is not completed, So Microsoft will include it in the next version.. NET Framework, and the design tool (desinger) is added to form the current ADO. NET Entity Framework.
Iii. application scenarios
Use ADO. NET Entity Framew
) has a high threshold;
4: write a new set, the transaction is busy, there is no time to calm down and think, and time is limited, has submitted a plan to the BOSS.
Finally, you can only select ASP. net mvc.
Think about the. NET environment, and the popular development frameworks on the market are all owned by Microsoft ?)
I also know that some older people also build frameworks, however, they are all made for themselves or their own companies (and th
Label:The project needs to migrate the system from the SQL Server database to Oracle. Since most of the data access operations were implemented by wrapping the unified Access portal of the Entity Framework, it was necessary to study how the Entity Framework was transferred from SQL Server to Oracle. Since ef4.x, Oracle
The Entity framework maps the entities and relationships defined in the conceptual model to the data source, using the Entity Framework to materialize the data returned by the data source as objects, to track changes made by objects, to handle concurrent processing, to propagate object changes to the data source, and s
Entity Framework 6 Recipes Chinese translation series (31), entityframeworkThe original intention of the translation and why I chose Entity Framework 6 Recipes. Please refer to Chapter 6-4 of this series to use TPH to model the self-reference relationship.
Problem
You have
Public Objectset Car > Carset{ Get { Return Carset ;} Set {Carset = Value ;}}}}
In fact, the above code is very simple. It defines a class that inherits objectcontext, and adds the collection of the car and department object objectset in this class.
In this way, all our preparations will be taken. Here is the result of testing your codeonly...
Step 5: test your results
Using (Companycontext CC = New Companycontext ()){VaR result = From C In Cc. carsetSel
Some time ago, many articles in the garden introduced the analysis of LINQ to SQL. It can be said that it is a simple implementation of ORM, And it is Microsoft's problem of unbalanced impedance between data and objects. C #3.0 introduces some new features, such as extension method, Lambda expression, and anonymous type. In fact, these new features are used to serve LINQ. By writing a large number of SQL query statements, values, and assignments in the past, the developer has made a lot of work
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