mvc database connection without entity framework

virtualize two navigation properties (Blog.posts and Post.blog). This enables the lazy load feature of the Entity Framework. Lazy loading means that when you try to access the contents of these properties, it is automatically loaded from the database. 3. Create context You can now define a derived context that represents a session of the

, you need to retrieve the required fields at one time as needed. Because it is CodeFirst, when writing an object attribute, you should also add the following common features: Enter [] in Name and Display in it, and I will spell the word, so every time I use her Right-click Display and import the namespace. You can also press Ctrl +. after entering the Display, press Enter? Make it as follows: The length (20) is still a bit useful. Otherwise, if you accidentally enter 100 character

In the previous article, I mentioned that "for cross-database queries, we have not found a method implemented through LINQ to entities ". Later I think about it. Theoretically speaking, it is not difficult to implement cross-database queries. Compared with non-Cross-database queries, I only have one more database name,

Label:Original: http://www.cnblogs.com/dudu/archive/2011/12/27/entity_framework_sys_databases.html The "Trespass sys.databases" here refers to a query initiated by the Entity Framework by default: SELECT Count (*) from sys.databases WHERE [name]=n ' database name ' Note: This article is for the Entity

DbContext In the execution add-migration Init This time has been successfully executed and the corresponding migration file has been generated Then perform the Update-database-projectname medicalinsurance.domain to update the migration to the database If you want to modify the field of an entity, or increase the field of an

follows:usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Data.Entity;usingblogappdal.entities;usingSystem.Data.Entity.ModelConfiguration.Conventions;usingSystem.Data.Entity.Migrations;usingSystem.Data.Entity.Infrastructure;namespaceblogappdal{ Public classBlogappcontext:dbcontext { PublicBlogappcontext ():Base("Name=blogappconn") { //automatically create tables if entity has changed to update

;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 Command Logging:In this section, you'll learn how to log commands queries sent to the database by Entity Framework. Prior to EF 6, we used the database tracing tool or third party tracing utility to trace database queries and commands Sen T by

Original: Entity Framework 6.1-database First IntroductionThis approach is a more traditional database-centric development model. It is more appropriate for a team with database DBAs, or for a database that already exists.Advantag

The first step to create a new database and table Use [TestDB]GO/** * * * object:table [dbo]. [T_user] Script date:01/14/2015 20:27:52 * * * * **/SETAnsi_nulls onGOSETQuoted_identifier onGOCREATE TABLE [dbo].[T_user]( [Id] [int] IDENTITY(1,1) not NULL, [Name] [nvarchar]( -)NULL, [Password] [nchar](Ten)NULL, CONSTRAINT [Pk_t_user] PRIMARY KEY CLUSTERED ( [Id] ASC) with(Pad_index= OFF, Statistics_norecompute= OFF, Ignore_dup_key= OFF, All

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.micr

Label:The ASP. NET Core Development-entity Framework Core 1.0 Database First,asp.net Core 1.0 EF core operations databases. The Entity Framework Core 1.0 has also been released and can be applied to. NET Core 1.0 and ASP. When EF Core RC2 is used, the code first:http://www.c

Entity Framework learning notes (1)-data model database, entityframework There are three modes for Developing Entity Framework data models: 1. Reference Database methods; 2. Create an EF empty Model in VS; 3. Code methods. The

Currently, the projects at hand are made of LINQ, EF, and MVC, And I am confused by cainiao. Two days ago, I finally had some free time, and it took me some time to solve a long-standing question: When did EF submit a query to the database? Now let's share my little gains. Why do I have the following questions: Use the SQL database northwind and simple ASP. N

Framework ﹕) my Opinion on Entity Framework: Although at first glance, it seems to be an O/R Mapping, but unlike the previous Orm, it puts forward a theory the relational model is used to design objects and then perform mapping. This is a step further than other ORM with only tools and no idea. As for its ESQL and LINQ to en