database-first

问题 I have my asp.net mvc 3 application with entity framework and i used the Database First model to set it up. My Steps below: 1. Genarated a database with tables 2. Created ADO.NET Entity Data Model file (.edmx) and imported the tables 3. inside the design i added a Code Generation item and used ADO.NET DbContext Generator 4. a Model1.tt holder as been made with all of the tables Models I have edited the models and updated them with DataAnnotations Attributes (just for the example a well known

问题 According to oneunicorn, DbSet.Attach puts all entities in the graph into the Unchanged state. However, entities will be put in the Added state if they have store-generated keys (e.g. Identity column) and no key value has been set. I'm having trouble with the "store-generated keys" part. My database was created in SMSS, and my table has an Id column of type uniqueidentifier, not null. It is the primary key. But how do I tell SMSS it should be store-generated? And will C# find out about that

问题 what i am trying to do is exclude few column from EF store and EF modal. for reference there are two method : https://stackoverflow.com/a/40742144/4998968 but i want to exclude column when edmx file is created i.e when i connect my database using Ado.net Data modal option i want few columns to be excluded from edmx as if they don't exists in database. currently i am exploring the entity framework source code but cannot find the exact code that generates .edmx file and store. example: suppose

问题 I created an Entity Framework model based on an existing database, then generated the POCO entities from the model. The connection string in my web.config isn't Entity Framework, it's just the standard connection string (it's missing the CSDL, SSDL, MSL references). I can compile my application, but when I run I get this error: Code generated using the T4 templates for Database First and Model First development may not work correctly if used in Code First mode. To continue using Database

问题 Spent better part of the day combing through SO for this. Here's the setup MVC 3 App using Repository pattern with 3 repositories across 2 databases. EF 4.1 Database first using the DBContext API for both db connections. Installed mvc-mini-profiler from nuget This is how I create my Db Context in the repository public class TransactionRepository : BaseRepository, ITransactionRepository { AccountingEntities _db = new AccountingEntities(); // repository methods } Then in controllers public

问题 I know how to add validation errors to the model state. I know how to add the validation annotations to my model classes. The problem is that with Database first, I don't want to touch the generated code, because when I regenerate, I will lose my customization. I always try to customize in partials, but you can't add annotation to an existing property in a partial. What is best practice here? 回答1: You need to take advantage of MetadataTypeAttribute Do something like this: Create a new class

问题 I have a table in Microsoft SQL Server 2008 R2 called Page with a primary key called ID . I have another table called Navigation with a column PageID . PageID is a unique foreign key reference to the ID column of Page . This creates a one to one relationship between Navigation and Page records. When generating models from the database, it creates a one to many relationship where a Page contains a list of Navigation records. Is this simply the Entity Framework detecting that there is a foreign

问题 I have a table in Microsoft SQL Server 2008 R2 called Page with a primary key called ID . I have another table called Navigation with a column PageID . PageID is a unique foreign key reference to the ID column of Page . This creates a one to one relationship between Navigation and Page records. When generating models from the database, it creates a one to many relationship where a Page contains a list of Navigation records. Is this simply the Entity Framework detecting that there is a foreign

问题 I think I have CodeFirst understood. Now I know database first EF design is targeted for existing databases, but if I were to quickly go in and create a new database in management studio and create some tables, is it normal that you would create relationships for the tables in management studio or in the edmx designer, I tried in the edmx but got errors when I went to debug. What is the best practice here and what are the correct steps to create Associations between tables if I were to do it

问题 I'm making a website with MVC .NET. Since I'm an old school programmer who learn to design database first, I opted for the Database first approach. I'm also using "code generation" which create files with the extension .tt . Everything is working so far except one things that botters me. Classic scenario: I realise that I am missing one field I add the field in the database. I go into the edmx and choose to update the model from the database. Then I go back to my code and things that use to