entity framework insert

of a class, including inherited, are mapped to columns in the corresponding table, which is known as a table (Table-per-concrete Class) inheritance for each specific class. If you implement TPC inheritance for the Person,student and instructor classes, then the student and instructor tables will be no different from the previous one.The TPC and TPH inheritance patterns in the Entity Framework are generally

concurrency, you can use database locks, known as pessimistic concurrency. For example, when you read a record from a database, you can lock it to read-only or update the state. If you lock a record to an updated state, other users will not be able to lock the record again, whether it is a read or update operation. If you lock a record as read-only, other people can lock it as read-only, but not update the operation.Management locks also have drawbacks, which can lead to more complex programmin

Before writing: I want to decompile system. Data. entity. dll (4.0 version) through refector, and find that only the attribute declaration and method declaration are decompiled.CodeNone of them. It's a big deal. I tried a few. the same is true for other net4.0 DLL files, and the refector on my machine is the latest version. Later I thought the dll path was incorrect and I referenced C: \ Program Files \ reference assemblies \ Microsoft \

yet launched a similar framework, and still relies on ado.net, the traditional data access tool. It is estimated that Microsoft also heard complaints from programmers, so from a objectspace (ObjectSpace) from one to 2005 years early. Proposed that the concept of the application being able to connect to and access the database in a fully object-based way, with a technical concept similar to that of NHibernate, was finally released in 2008 Ado.net

applications from the left menu Enter databasefirstsample as Name Select "OK" 3. Reverse engineer The ModelWe use the Entity Framework designer in Visual Studio to create the model. Project, add New Item ... Select data from the left-hand menu and select the ADO Entity Data Model Enter Bloggingmodel as the name, and then click OK

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 seventh: read the relevant data for the ASP.net MVC application Original: Reading Related Data with the Entity Framework in a asp.net MVC application You

between a Photograph object and a PhotographFullImange object. In addition, we add a constraint similar to the database reference constraint in the concept layer, which tells the Entity Framework that a PhotographFullImage cannot be independent from Photograph. Because of the existence of reference constraints, we have two things to note in the model: one is, before we create an instance of the PhotographF

This article will lead us into the ado.net world through the use of the enumeration in the Ado.net Entity Framework 4. An enumeration (enum) is a commonly used type, such as a parameter to represent a state, a type, and so on. But at the moment it will not be officially supported in the Ado.net Entity framework. This

Entityframework, one of the Entity Framework skill Series The original series is from English. Tip 1: How to sort the relationship (Relationships) in Entity Framework) Problem: In the Entity Framework forum, you will often see que

Why is another data model required? So why do we need to build another model? As the company's data processing volume increases, streamline the data relationship and develop applications based on the data.ProgramIt becomes very difficult. Storage problems (such as data integrity, performance, and management) need to be considered in the design of the database architecture. Sometimes this is not easy to understand. These architectures often conflict with application structures, making developme

Some time ago there were many Article This article introduces and analyzes LINQ to SQL. It can be said that it is a simple implementation of ORM, which is a problem that Microsoft has 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. Program In the past, I was freed from writing a large number of SQL query statements, values, and assignments. I

Entity Framework basics, entityframeworkOverview Entity Framework (EF) is another product specifically implemented by Microsoft ORM. This blog will briefly introduce it. As for its deep-seated usage, You can query the corresponding operation manual. This article is only an entry point. Relationship between

Entity Framework Code First Learning Series CatalogEntity Framework Code First Learning Series Description: Development environment for Visual Studio + Entity Framework 5.0+ms SQL Server 2012, database-side Entity

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 Framework, SQL is transparent to the

= "Com.liuyang.demo_4.Student"> Resultmaptype= "Com.liuyang.demo_4.Student"ID= "Studentmap"> ID Property= "id"column= "student_id"/> result Property= "Name"column= "Student_name"/> result Property= "Salary"column= "Student_salary"/> Resultmap> There's no parametermap . - InsertID= "Add"ParameterType= "Com.liuyang.demo_4.Student">INSERT into student (student_id,student_name,student_salary) VALUES (#{id},#{name},

are no longer using this development method. Of course, for some old projects to upgrade, it is very convenient to use this method in the case of having a database.1. Create a blank workaround Efdemo, create a console application under Efdemo Efdbfirst, right-click Add New Item, select Entity Data Model, create Entity Data Model Efdbfirstmodel2. Select the Model type3. Create a new database connection, thi

As part of my thesis I measured the performance of some. net orm frameworks including NHibernate and Entity Framework. measuring was done by implementing two simple applications using the same table structure and doing the same operations on the same data. Note: before reading this article please see my views on comparing ORM tools. Also see the follow up post to this comparison for revised results. I measu

In the system architecture design, cache is the most common strategy to reduce database load and improve performance. The main purpose of cache is to reduce the numberReadOperation. But in different cases, we need to use different forms of cache. For example, if the data in the data table is static and does not change, it is very easy. We only need to load the data to the memory when the system starts, you can read data from the memory each time. For another example, the data in the data tab

this interface for programming. Dal uses an object class used in the data access layer to inherit the object class interfaces in these projects. Take the user entity class as an example to define an iuser interface under oxite. Data. Bll and UI both use this interface as an object class. In Dal (oxite. linqtosqldataprovider), you can find a partialclasses. CS file, which implements various object class interfaces. Here we can find the partial class o

Entity Framework 6 Recipes 2nd Edition (9-3) 9-3. Find out what has changed in the Web API Problem You do not have to write a separate update method for each object class. in addition, EF6 Code Frist is used for data access management. In this example, we simulate an N-layer scenario and use a separate client (console application) to call a separate REST-based Web site (web api application) Note: Each layer