Entity Framework 6 - Knowledge Base (KB)
163 results for: in tag: code-first
Using Entity Framework 4.0 with Code-First and POCO: How to Get Parent Object with All its Children?
I'm new to EF 4.0, so maybe this is an easy question. I've got VS2010 RC and the latest EF CTP. I'm trying to implement the "Foreign Keys" code-first example on the EF Team's Design Blog, ...http://blogs.msdn.com/efdesign/archive/2009/10/12/code-only-furt...
asked by SirEel
EF code first - composite key
I have a legacy database which has two collumns and I want to map them as 1 ID is this possible...for example... public class Product { public string ProductID {get;set;} public string ShortDescription {get;set;} public string UserName {get;set;} } ..
asked by server info
Entity Framework CTP 4 - Code First Custom Database Initializer
I would like to implement a custom database initialization strategy so that I can generate the database schema and apply it to an EXISTING EMPTY SQL database using a supplied User ID and Password. ...Unfortunately the built-in strategies don’t provide w...
asked by Mark
SQL Server Express connection string for Entity Framework Code First
I am working in Visual Web Developer 2010 Express, and using the Entity Framework code-first CTP. I am able to do this with the new SQL Server CE but I am unable to find a connection string to work with SQL Server Express....This one, using the SQL Server...
asked by GilShalit
Entity Framework Code First - No Detach() method on DbContext
I'm wondering why there is no Detach method on the DbContext object like there is for ObjectContext. Â I can only assume this omission was intentional, but I have a hard time figuring out why. Â I need to be able to detach and re-attach entities (for putt...
asked by Brian Sullivan
Why is my DbContext DbSet null?
I created a new Entity Frameworks Code First app and the DbSet (People) is returning null....public class Person { public int Id { get; set; } public string Name { get; set; } } public class Repository : DbContext { public DbSet<Person> Peopl...
asked by Jamey McElveen
EF4 Code-First causes InvalidOperationException
I'm having an issue when trying to run my project each time it builds. It seems the initializer runs, but when it comes to the first query - it dies with the following ...InvalidOperationException.......This operation requires a connection to the 'master'...
asked by Amadiere
Unique Constraint in Entity Framework Code First
Question...Is it possible to define a unique constraint on a property using either the fluent syntax or an attribute? If not, what are the workarounds?...I have a user class with a primary key, but I would like to make sure the email address is also uniqu...
asked by kim3er
Force EF 4.1 Code First to See an Attached entity as Modified
All the examples I've found refer to a class called ObjectContext, which doesn't appear to exist in CTP5. I must stress at this point, CTP5 is my first exposure to the Entity Framework....I have a disconnected POCO that I have attached to my DbContext. Sa...
asked by kim3er
SQLite with EF Code First
After my success using SQLite with NHibernate, I am very happy to use it for testing with Entity Framework Code First....If you have some example connections string and set up demos, that would be great and save a bit of time from my hectic day....Thanks ...
asked by nick
how to annotate a parent-child relationship with Code-First
When using the CTP 5 of Entity Framework code-first library (as announced ...here...) I'm trying to create a class that maps to a very simple hierarchy table....Here's the SQL that builds the table:...CREATE TABLE [dbo].[People] ( Id uniqueidentifier no...
asked by Ralph Shillington
Returning a DataTable using Entity Framework ExecuteStoreQuery
I am working with a system that has many stored procedures that need to be displayed. Creating entities for each of my objects is not practical. ...Is it possible and how would I return a ...DataTable... using ...ExecuteStoreQuery... ?...public ObjectResu...
asked by detroitpro
How do I populate data in Entity Framework code first on database creation?
I'm using code first entity framework and I would like to know how to run some code when the database is being created so that I can populate my database with some data. (note that I'm asking for on database creation, not everytime the application starts)...
asked by ajma
How do i define Keys when working with "EF-Code First"?
I get a ModelValidationException (at the bottom) when working with "EF-Code First". It wants me to define a Key but I'm not sure what exactly it means......public class Unit { Guid id; String public_id; String name; bool deleted; }...
asked by gingerbreadboy
Entity Framework DateTime and UTC
Is it possible to have Entity Framework (I am using the Code First Approach with CTP5 currently) store all DateTime values as UTC in the database?...Or is there maybe a way to specify it in the mapping, for example in this one for the last_login column:..
asked by Fionn
How to configure ProviderManifestToken for EF Code First
I have a asp.net MVC3 project using EF code-first. For my unit testing I have been using SQL Server CE 4.0 and SQL Server 2008 Express. Both have worked perfectly with EF generating my database as expected....However, when I run my application outside of ...
asked by trevorc
Entity Framework Code First, foreign key/object should not save
I have three classes, like so:...[DataContract] public class ApplicationDto : BusinessBase<int> { /// <summary> /// Gets or sets the name. /// </summary> /// <value>The name.</value> [DataMember] public string Name { get; set; } ...
asked by MartinHN
Generate SQL CE database from EF Code-First DbContext class
I've defined a set of classes in the style of Entity Framework Code-First conventions and annotated the class properties with System.ComponentModel.DataAnnotations attributes....Now I want to generate a SQL Server Compact Edition (SCSE) (4.0) database fro...
asked by Bent Rasmussen
Does Entity Framework Code First support stored procedures?
I've watched several presentations of EF Code First and haven't seen how EFCF works with stored procedures....How can I declare a method that will use some sp? Can I pass an entity to a method that calls sp without manually mapping entity properties to sp...
asked by frennky
How to update a row using Entity Framework code first?
How should I go about updating a row in the database? There is no update method, and if I use add and the primary key id already exists, I get an exception. Please provide an example if possible.
asked by Ryan
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