entity framework insert

persistent object must actually correspond to the entity in the database, so it is different from POJO. For example, POJO is created by new and recycled by GC. However, the persistent object is created in the insert database and deleted by the delete database. Basically, the lifecycle of persistent objects is closely related to databases. In addition, persistent objects can only exist in one database Conne

I remember paying attention to entity from the beginning of last year. Framework. At that time, it was just a simple test and found that it was not very mature than nhib.pdf. At that time, EF was mainly developed in table-Driven Mode and relied heavily on EDM files. In addition, the data layer coupled with the model layer made some MVC users suffer. From the oxite1 project to the oxite2 project, Microsoft h

Entity Framework Quick Start -- directly modify (brief introduction to objectcontext processing mechanism) Before introducing how the Entity Framework modifies an object to a database, let's briefly introduce the processing mechanism of objectcontext. 1. objectcontext Processing Mechanism Objectcontext is entityFramewo

The recent use of JPA has encountered a problem: repeated column in mapping for Entity:com.ketayao.security.entity.main.User column:org_id (should is map PED with insert= "false" Update= "false")This error is caused by the entity class. As I started, I wrote:@ColumnPrivate long orgId;@ManyToOne@JoinColumn (name= "OrgId")Private Organization Organization;Here the get and set methods are omitted.Change to the

After one month of study, from the access to Silverlight to the completion of a first-class application framework, it is indeed quite tired. Originally, the bottom layer was quickly finalized, but due to the long debate during the selection, it took some time, while I was only responsible for the bottom layer, but due to the slow progress of the client team (the reason is hard to say ), this week, I started to take over the work in this area. After se

Microsoft released the final version of Entity Framework (EF) 4.2. Although this update only contains one error correction, it is interesting that it applies Microsoft's semantic version control and they try to put EF and.. NET Framework, but they said the process was not as smooth as they expected. This error fix is related to an issue in EF 4.1 update 1. Accor

Entity Framework 6 Recipes Chinese translation series (45), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.8-6 get the original object Problem 　　You are using POCO and want to obtain the original object from the database. Solution S

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)Seventh talk ObjectQuery query (bottom)Eighth, adding and deleting of

The DATABASEFIRST:EF framework automatically generates data layers and model based on the database. Project--Add--New item--Data--ado.net Entity Data Model--build from database--New connection--Select server name, database--[Yes, include sensitive data in connection string]--Select datasheet, view in database, Stored procedure--complete--Overwrite web.config Using System; Using System.Collections.Generic;

the implementation of complex types Abstract: currently, because EF does not support complex types, therefore, we cannot design the complex types we need in the visual designer in. Therefore, we need to manually modify the entity model to support complex types of attributes. Entity Framework learning Intermediate 2-stored procedure (I) Abstract: This section d

whether the two level cache and local cache are emptied after the operation is performed Timeout, defaults to unset (dependent on the JDBC drive settings), sets the maximum time limit for performing the operation, and the timeout throws an exception DatabaseId, value range oracle|mysql, etc., for database manufacturers, within the element can be " Second, Mapper interface Third, perform mapper.xml return primary key Both approaches satisfy demand. Note: The Mapper interface return value is

Entity Framework-DB First method, entityframework EF (hereinafter referred to as Entity Framework) has three methods: DataBase First, Model First, and Code First. The following is the Db First method: 1. There are two tables in the database. One is a professional table and the other is a student table. One student can

@model ienumerableThe above code changes the title from index to departments, moves the administrator name to the right, and provides the full name of the administrator.In the Create, Delete,,details, and edit views, modify the title of the Instructorid field to administratorUse the following code in the Create and edit viewsUse the following code in the delete and details viewsRun the project, click the Departments tabThe program runs fine, but in this controller, all SQL queries are executed a

data Base service of your choice. MySQL connector.net 6.9.4 or higher, downloadable from the official site or using NuGet. Step 1. Creating a new Web applicationLet's start Visual Studio and create a new C # project just like that: In the following screens we ' re gonna choose the MVC template, then we ' re-click to the Change Authentication ... button where W E can choose if we want to enable authentication mechanism or not. The answer here depends on the features we need to has the

using asynchronous and stored procedures for asp.net MVC applications This is the translation of the Microsoft Official tutorial Getting started with Entity Framework 6 Code The 5 series, this is Nineth: using asynchronous and stored procedures for ASP.net MVC applications Original: Async and Stored procedures with the Entity

. NET development when it comes to manipulating databases, especially when accessing SQL Server databases, it's often necessary to use some ORM frameworks, the most commonly used, and the most powerful ones to count EF. When using EF for database-related development, there are typically two modes involved: 1,db First;2,code first. Compared to the former, Code first is more flexible and suitable for agile development, especially when the database table structure is constantly changing. When using

If the user table and the permission table are many-to-many, where the annotation configuration in the user table:Permissions@ManyToMany (cascade = cascadetype.all, fetch = Fetchtype.eager)@JoinTable (name = "User_permission", Joincolumns = @JoinColumn (name = "user_id"), Inversejoincolumns = @JoinColumn (name = "permission_id"))Public listAnnotation configuration in the permissions table:User@ManyToMany (cascade = cascadetype.all, Mappedby = "Permissionlist", Fetch = Fetchtype.lazy)Public listW

This essay list:1. Foreign key Column name default convention2, one-to-many relationship3. One-to-one relationship4. Many-to-many relationships5. A one-to-many reflexive relationship6. Many-to-many reflexive relationshipsIn a relational database, it is not always the case that all the tables exist separately, but they are related to each other. There can be a foreign key dependency between two different tables, and a table can have a reflexive relationship (a field in the table refers to a prima