scaffold dbcontext

Application Scenarios:We are in the process of development, the operation of the database is an essential part of the general practice is to directly use the using () statement block, immediately after the use of free connection resources, this practice in the desktop application is not a problem, but in the Web program, especially in today's big data, high traffic times, Response speed has become a good quality of the site is a very important measure, we also know that SQL Server database conne

Re-adjust the project structure is because and group of friends Dezhou a chat, my original idea is the project as far as possible to do simple points do not complicate, only use the DbContext injection, the other is not written interface coupling is very high. After chatting with Dezhou, I thought about it carefully, or decoupling it, originally according to the software design pattern should be high cohesion low coupling, low coupling makes the proje

(11) auto_increment primary key,Title varchar (100 ),Description text,Buydate date) Modify C:/instantrails/rails_apps/mybook/config/database. yml(Yaml configuration benchmark, can be used to test the http://www.yaml.org/and http://www.ruby-doc.org/core/classes/YAML.html)Development:Adapter: MySQLDatabase: mybookUsername: RootPassword:HOST: localhostTest:Adapter: MySQLDatabase: mybookUsername: RootPassword:HOST: localhostProduction:Adapter: MySQLDatabase: mybookUsername: RootPassword:HOST: local

The EntityFramework database connection can be dynamically set by code, entityframework From: http://blog.csdn.net/dyllove98/article/details/9289553 Database generation location controllable (mainly DbContext constructor) 1. Use the DbContext Constructor: Public DbContext (string nameOrConnectionString) A. Add the following in app. config: 1 Note: of course he

. Net EF framework-added, deleted, modified, and queried. netef Declare an EF context object Model dbContext = new Model (); Add operation (insert a data entry to the table) // Declare the object Contact = new contact () for a table; // Add data Contact to the field in the table. name = "James"; contact. enrollmentDate = DateTime. now; // insert dbContext. contacts. add (contact); // save

: EF Implementation of Identity data persistence.● Microsoft. AspNet. Identity. OWIN: the Identity-based OWIN authentication plug-in, which replaces the original Form authentication.● Microsoft. Owin. Host. SystemWeb: the IIS Host OF Owin, which transfers the requests received by IIS to Owin for processing.Install using the Identity component in ASP. NET MVC 1. Install Microsoft. AspNet. Identity. EntityFramework (including Microsoft. AspNet. Identity. Core) through Nuget ): 　　 2. Install Micros

Many tutorials on the Internet are tied to mvc3. If mvc3 is left blank, how can we use it? Create a console applicationProgramWe name it efcodefirst-books. Step 2: add an entityframework reference. Don't say that you are not using nuget again. If not, ask du Niang. Enter install-package entityframework in the nuget console. nuget will reference the latest EF version. The current version is 4.3. Step 3: add an object class. I created a new models folder and added the book class to it. T

in the storage model.The types in (2) and (3) are used internally by EF and are usually not accessible in actual development.All of these three models are centrally placed in an XML-named EDMX file.VisualStudio provides a wizard to complete the mapping transformation between the existing database and the EF data model:When this wizard finishes, EF successfully establishes the following correspondence between the database and the objects used in the program: world of relationa

Scaffolding is a very easy way to rails, some simple additions and deletions to check the scaffolding can be achieved, save us unnecessary trouble, so how to use rails scaffolding, today to explain. . Specify port Start Rails project Copy Code code as follows: Ruby Script/server Webrick-p 3000 0. Create a project Copy Code code as follows: Rials Demoshop 1. Create products with scaffolding (Control model display data) Copy Code code as follows:

wedenet2018.infrastructure-Infrastructure Layer:The structure is as follows:The tools structure is as follows:Considering that the system may have multiple data contexts (temporarily taking two as an example), define two T4 templates as needed to generate the corresponding entities and DbContext classes, each T4 template corresponding to a database connection, These database connections are configured in the application-tier configuration file, such a

The data storage layer is implemented in the project Ninesky.datalibrary, and the entire project has only one class repository. Repository in the implementation of additions and deletions to query and other methods for business logic layer calls, the main functions as follows: Specific steps Add a reference to the Entity Framework 1, open the solution, select the project Ninesky.datalibrary, right click on the reference, select the management NuGet package. Click EntityFramework in th

update the database (structure). Code first (using existing database):0 Define entity classes and mappings (such as mappings for classes and tables, mappings for properties, and table columns) in code.0 or use reverse engineering to generate entity classes and mappings. manipulating databases with EF Code first For this series of articles only code first (* ^_^ *) is introducedNow the entity class already exists in the blog code and the database and the corresponding data table already exist, s

[ORM] Entity Framework (1) CodeFirst Quick Start, ormcodefirst Entity Framework is an O/R Mapping solution developed by Microsoft Based on ADO. NET.Object relationship ing (English:Object Relational ing, AbbreviationORMIs a program technology used to convert data of different types of systems in object-oriented programming languages. Download: Install-Package EntityFramework-Version 6.1.3 (7.0 only in CodeOnly Mode) This section provides a technical overview: database installation, DB First, Mo

Entity Framework basics-article 2, entityframework The Entity Framework (EF) is a type of data persistence layer Framework. Other frameworks include NHibernate, ibaties, Dapper, PetaPOCO... and so on, all are based on the ORM idea. First, we will introduce O/R Mapping (ORM) 1. What is ORM? ORM refers to the mutual conversion between object-oriented object models and relational database data structures. It can be understood as converting table entities and tables (applicable on any platform, such

{ Return String . Format ( "{0}, {1 }" , This . Lastname, This . Firstname) ;}set {}} [stringlength (256)] Public String Telephone {Get; set;} [stringlength (256)] Public String Company {Get; set ;} Public Decimal Creditlimit {Get; set ;} Public String Createdby {Get; set ;} Public Datetime createdon {Get; set ;} Public String Modifiedby {Get; set ;} Public Datetime? Modifiedon {Get; set;} [concurrencycheck] Public Long Rowversion {Get; set ;} Public Bool Isdeleted {Get; set ;}}

Those who have been familiar with EF should know that there are currently three programming models of EF. Database first: database first Model first: model first Code first:CodeFirst Code first can start encoding without creating a database, and then generate a database through code. First, write a simple student class. It is usually called an object class, and a table in the database will be generated at the end. Class Students {[Key] Public Int Stuid { Get ; Set ;}

One, compare LINQ to SQL Recently learned two things with Orm thought, one is LINQ to SQL, the other is EF ...After learning is always from the use of feeling that they are the same, and later checked their own, statistics a table:Each has the pros and cons of it ~ ~ Welcome to Supplement ~ ~ ~Two, EF for simple additions and deletions to search static void Main (string[] args) {#region Adds a single entity using (var dbContext = new

Document directory Content of this section: Nuget package DbContext Warehousing Default Storage Custom warehousing Specific storage base class Custom warehousing example Best warehousing practices You can use any ORM framework. It has built-in EntityFrame (hereinafter referred to as EF). This document will explain how to use EF in ABP. We assume you have a preliminary understanding of EF. Nuget package The Nu

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/entity-framework-4-1-bypassing-ef-query-mapping-8/We can see the English tutorial recommended for Entity Framework 4.1. To help you look more convenient, we can translate it briefly. This is a series of 8 articles, and this is 8th articles. This is the last article in this series. I will discuss how to bypa

, 240), IsolationLevel = System.Transactions.IsolationLevel.RepeatableRead })) * 3 SaveChange. A large transaction is nested in the outermost layer, with 58 seconds and 50 seconds not nested. If a DbContext contains a large number of savechanges, some transactions are more optimized in terms of results. The specific reason is unknown and is to be investigated.* 3 SaveChange, narrowing t