programming entity framework code first

class EmployeeController : Controller { EmployeeRepository employeeRepository = new EmployeeRepository(); public ActionResult Index() { return View(employeeRepository.GetDepartments()); } }} The strong type view of Employee/Index. cshtml is displayed, and the content is presented using a beautiful table style provided by mingkai. @ Model IEnumerable When the Employees set attribute of Department is displayed, the set is traversed through the strong

Entity Framework 6 Recipes 2nd Edition (10-1) Translation-> returns an object set in non-Code Frist mode, recipesfrist Stored Procedure Stored Procedures exist in any type of relational database, such as Microsoft SQL Server. stored procedures are some code contained in the database. They usually perform some operation

Entity Framework Code First pseudo implementation in Oracle, entityoracle Why is it a pseudo-implementation, because it cannot be as full as in MsSql. We still need to manually create the database in Oralce. Here, we discard the EDMX file in Model First and write the Model and ing relationships in the Code. This is a b

dataannotations-notmapped Attribute:notmapped attribute can is applied to properties of a class. Default Code-first Convention creates a column for all the properties which includes getters and setters. notmapped attribute overrides this default convention. You can apply notmapped attribute to a property which your do not want to create a column in a database table for.Consider the following example.usingSystem.ComponentModel.DataAnnotations; Public

stringPWD {Get;Set; } } Public Partial classOrclcontext:dbcontext { PublicOrclcontext ():Base("Name=orclcontext") { } Public VirtualDbsetGet;Set; } Public VirtualDbsetGet;Set; } Public VirtualDbsetGet;Set; } protected Override voidonmodelcreating (Dbmodelbuilder modelBuilder) { Modelbuilder.hasdefaultschema ( "User_snapsia"); DBO schema in Oracle database for user name modelbuilder.entity() . Property (e=e.id). Isunicode (false); } } Two issues du

= "Accountcontext", the value of the database connection name is consistent with the previous context-dependent database connection name. 1 2 "accountcontext" connectionstring="Data source=.; Database=mvcdemo;uid=sa;pwd=sunfast; " providername="System.Data.SqlClient"/> 3 4. Run the project, the database will be created automatically, the database file is placed by default in SQL Server installation directory, the database will create more than one table [dbo]. [__migrationhistory] record

Seed Database in Code-first:You can insert data into your database tables during the database initialization process. This'll be important if want to provide some test data for your application or to provide some default master data F or your application.To seed data into your database, you have to create a custom DB initializer, as you created in DB initialization Strateg Y, and override the Seed method. The following example shows how can provide de

Turn off DB Initializer in Code-first:You can also turn off the DB initializer of your application. Suppose, for the production environment, you don't want to lose existing data and then you can turn off the initializer, as S Hown in the following: Public classSchooldbcontext:dbcontext { PublicSchooldbcontext ():Base("schooldbconnectionstring") { //Disable initializerDatabase.setinitializerNULL); } PublicDbsetGet;Set; } Publ

Entity Framework basics-Article 6 (Code First), entityframework If you don't need to talk about it, create a project directly below: 1. Create a console application Public class UserInfo { public UserInfo() { OrderInfo = new HashSet [Key] Public int UserID {get; set;} // primary key Public string UserName {get; set;} public virtual I

;public class Lesson {public int Lessonid {get; set;} Public string Lessonname {get; set;} public string TeacherName {get; set;} public virtual UserInfo Userinfo{get;set;}}[CSharp]View PlainCopyprint? Using System.Data.Entity; Public class Testusersdb:dbcontext { Public dbsetget;set;} Public dbsetget; Set;} } Using System.data.entity;public class testusersdb:dbcontext{public dbset[CSharp]View PlainCopyprint? Using System; Using System

Label:Database initialization Strategies in Code-first:You already created a database after running your Code-first application the first time and what's about the second time on Wards?? Would it create a new database every time you run the application? What's the production environment? How does you alter the your domain model? To handle these scenarios, you have to use one of the database initialization s

Fluent API in Code-first:We have seen different dataannotations attributes in the previous sections to override default Code-first conventions. Here, we'll learn about the Fluent API.Fluent API is another-configure your domain classes. Fluent API provides more functionality for configuration than dataannotations. Fluent API supports the following types of mappings. mappings to Database

.Models.UsersContext.To Enable Migrations for MvcApplication1.Models.MovieDBContext, use Enable-migrations-contexttypename MvcApplication1.Models.MovieDBContext.To Enable Migrations for mvcapplication1.purchaserequestentities, use Enable-migrations-contexttypename mvcapplication1.purchaserequestentities. This is because I have performed enable-migrations before and the system prompts me to already exist MvcApplication1 contextThe following folder appears in the project:Opening the Configuati

Currently, the default setting of Entity Framework code first in appharbor may cause some problems, because EF will execute dropcreatedb by default, and appharbor has the permission to drop. Currently, the solution provided by appharbor is to use this nuget package. However, even though this package is not explicitly stated in the package, it does not actually

What version of EF are you using now? I use EF6, you can rewrite the sqlservermigrationsqlgenerator to generate foreign keys and update the foreign key method, the unnecessary tables are filtered out not OK?1 Public classExtendedsqlgenerator:sqlservermigrationsqlgenerator2 {3 #regionFOREIGN key4 protected Override voidGenerate (dropforeignkeyoperation dropforeignkeyoperation)5 {6 if(Isignoretable (dropforeignkeyoperation.dependenttable))7 retu

Entity Framework Code First migration command, codefirst I. Enable-Migrations 　　Note:Enable migration for the project. This command adds the Migrations folder for the project, including two files: Configuration class: This class allows context-based Configuration migration. InitialCreate migration: this migration is generated before migration is enabled. If the

tables. Because we designed two exercises for ourselves .) So far, I found that we have not named our project. What's better? Let's call it reportingsyncer. Reporting (report), sync (synchronization), why add er? Currently, Project names are often anthropomorphic, Which is vivid and powerful. [Start] Open vs 2010 and create a new class library named reportingdbmanager. Delete automatically generated class1.cs. Modify the SLN (solution name: reportingsyncer ). Modify the namespace: Right-click r

In Entity Framework 4.1, foreign keys are generated in the following ways: 1-if the navigation attribute is specified, a foreign key is automatically generated. The naming rule is "Table name_primary key name"2-by default, fields with the same primary key name as the navigation property are automatically marked as foreign keys,3-use [foreignkey] to mark the attribute of the specified object class as a for

Tags: Database informationTwo, reference DLL:1, the use of NuGet installation EF6.0.2;2. Install MySql.Data.Entity.EF6 with NuGetNote: To install with NuGet, the appropriate DLL or configuration information may be missingIi. configuring Web. config or app. Config1. Replace the Entitframework node with the following:2. Add ConnectionString node:Three model BuildingUsing System;Using System.Collections.Generic;Using System.Linq;Using System.Text;Using System.ComponentModel.DataAnnotations;Using Sy