using entity framework

after execution. Summary The above are all the steps for creating a database using model first of Entity Framework. Compared with previous versions, it has made great improvements. Now you only need to design an object model. Vs will automatically generate statements for creating data tables, indexes, and table relationships. This is the first article in th

read related data for ASP.net MVC application This is the Microsoft Official tutorial Getting started with Entity Framework 6 Code The 5 Series translation, this is eighth: Update related data for ASP.net MVC application Original: Updating Related Data with the Entity Framework in a asp.net MVC application You have su

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

create a solid data model with the following steps:1. Right-click on the Models folder in the "Solution Browser" window and select menu item, "Add", "new item", such as:2. In the dialog box that appears, select data, and then select ADO. NET Entity Data Model (ADO), and named Mydbmodel, for example:3. Clicking the "Add" button will run the Data Model Wizard.4. In the Select model content (Choose model Contents), select the "Generate from Database (Ge

(orderitem );Person. Order. Add (order );Personrepository = new personrepository ();Personrepository. updateperson (person );Console. Write (person. Order. First (). ID + person. Order. First (). orderitem. First (). Id );}}} Iv. performance problems The excessive use of reflection will degrade the system performance, so pay attention to the scope of use of this update method. Generally, this reflection update is only used in small projects. If it is used in large and medium-sized project

, people began to match data in relational databases with a collection of entity model objects using generic technology, which solves the shortcomings of the DataTable approach, and it has the characteristics of strong typing, auto-completion in VS, compile-time checking, etc. NET Developer's favorite.In order for developers not to do this "match" work manually, many ORM tools (such as

Label:There are 3 common actions for a single entity: adding new entities, modifying entities, and deleting entities. 　　1. Add a new entity 　　Entity Framework Code First adds a new entity by calling the Dbset.add () method. using

Issue: After migrating the database using the Entity Framework, each time you modify the code (not the Model code), the error is:Models that support the "Xxxdbcontext" context have changed since the database was created. Consider migrating the update database (http://go.microsoft.com/fwlink/?LinkId=238269) using Code f

object is created and associated with the context. Compile it first. Viii. Deleting an existing database The program is not running, so the database is not generated yet. First delete the original, brand-new, how the original should have. It's really clean. Nine, run the list page The empty X. Adding records 11. View the Database I just didn't use it because I couldn't even. 12. Model Changes 1,enable-migrations 2. Modifying entity object

Original address: http://www.it165.net/pro/html/201210/3932.htmlRecently started to study web API, good luck the first test project encountered a problem @@-when new control is selected [API Controller woth read/write actions, using Entity Framework] Then use the Northwnd database, data table select Orders,order_details,products.The front-end JavaScript program c

, basically is due to not carefully caused, so in the next study must be careful2. Knowledge about "Package Manager console" here and here3, the above coding mode is "code First", "code before the current", English better Remember code firstRelated information:Http://msdn.microsoft.com/zh-cn/data/jj193542.aspxhttp://www.cnblogs.com/qouoww/tag/Entity%20Framework/4, the Database migration related information:http://blog.csdn.net/vaivxuanzi/article/detai

In any framework, database usage is a key because most of the data we use is stored in the database. ASP. net mvc provides excellent support for databases, especially when we are developing, we can use the Entity Framework.CodeCode-first is preferred. The so-called code priority should be discussed with model priority or database priority. Simply put, model first means that we must first design the model

This article supporting source code This article uses the following techniques: LINQ to SQL, ADO. NET Entity Framework and SOA Directory To create a data access layer Persisting individual objects Tracking changes across service boundaries Configuring clients Summarize To date, Microsoft has published two products for developers that are designed to reduce the impedance mismatch between relational

Be careful when using the WCF + Entity Framework. Otherwise,EasyFall into various traps. This section describes two problems that are easily encountered during serializationService stopped. 1. The service is stopped by trying to serialize the entity proxy class. Ii. Service stops due to an endless loop during seria

Learn articles collected during the Entity Framework, transferred from Http://www.cnblogs.com/hiteddy/archive/2011/10/01/Difference_among_IQueryable_ Ienumeralb_ilist_in_entity_framework.htmlWhen using an ORM framework such as the Entity

Here's a note of the issues you encountered before using the entity Framework (4.3.1 version).To update a table that does not have a primary key setBy default, EF cannot perform an update, insert, or delete action on a table that does not have a primary key. To view the edmx file in XML, you can see the following XML fragment in SSDL (I defined a table Tb_without

Label:Original: http://lvasquez.github.io/2014/11/18/EntityFramework-MySql/ For the Entity Framework 6 support We need to has this requirements MySQL connector/net 6.8.x MySQL Server 5.1 or above Entity Framework 6 Assemblies . NET Framework 4.0 or abov

the script content to the interface, actually generates the operation in the background, is the line HTML code is, the code resembles the following content.li>href= "#" onclick= "showsubmenu ('/user/index ', ' User management ', ' Default ')"> Rights Management a>li> The final effect is that the blog began to introduce the interface, there is no change, but the code we have been a few steps to optimize the finishing, looks very refreshing, more able to achieve dynamic changes.Mvc4+eas

of all content.The above uses the ViewBag object to pass the script content to the interface, actually generates the operation in the background, is the line HTML code is, the code resembles the following content.The final effect is that the blog began to introduce the interface, there is no change, but the code we have been a few steps to optimize the finishing, looks very refreshing, more able to achieve dynamic changes.650) this.width=650; "src=" Http://images.cnitblog.com/i/8867/201404/1623

ing between the table fields and object attribute names is the same and case-insensitive. When an object has a base class and defines the property ing (for example, the Id attribute) in the base class, the data table fields must be moved to the base class, you need to change the corresponding column of the database table to the same name as the attribute of the base class. (I have not studied any other solutions here. If you have any questions, please let us know.) from another perspective, use