entity-framework-6

My context is => Using this model via Entity Framework code 1st, data table in database becomes => 1) User Table 2) Role Table 3) UserRole Table - A new linked table created automatically Model for User is => Model for Role is => and my O Data query for inserting record for single User/Role table working properly Now, what query should I write, when I want to Insert record to UserRole table can someone have any idea // Fetch the user. var user = await metadataManagentClient.For<User>().FirstOrDefaultAsync(x => x.Name == "Test"); // If you want to add a new role. var newRole = new Role() { Name

I am using EF code-first. I need to change the datatype of primary key of one table in our production database. public class Course { [Key] public Guid Id {get; set;} //This needs to be changed to int public string Name {get;set;} public virtual ICollection<Group> Groups {get;set;} } public class Group { [Key] public Guid Id {get; set;} public string Name {get;set;} public virtual ICollection<Course> Courses{get;set;} } As the above is a Many-Many relationship, EF has created a join table GroupCourses automatically with PK & FK as both Group_Id and Course_Id . Which is fine until now. Now I

I have a problem with navigation properties and inheritance. This is my problem: I have a base Person class and classes User and Worker which inherit from Person . On the DB level I'm using single table inheritance or table per hierarchy (TPH) inheritance. So there a single table with a discriminator column. Both User and Worker need to have a Company relation, so I would like to define it on the Person class. I define my model like this: [Table("mydb.person")] public abstract partial class Person { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public long ID { get; set; } public

Problem I have a situation whereby I need to use Entity Framework 6, Code First, with a legacy database structure which cannot be changed. The database has a very generic table which stores text based data alongside some non key data which can be used to relate the record back to another table. To illustrate: Assume the Notes table has a model as follows: [Table("Notes")] public class Notes { [Key] public int RecordId { get; set; } [Required] public string RelatedTableName { get; set; } [Required] public int RelatedTableRecordId { get; set; } [Required] public string NotesText { get; set; } }

When I try to instantiate a DbContext I receive this message: System.NotSupportedException: There is no store type corresponding to the conceptual side type 'DateTimeOffset' of primitive type 'DateTimeOffset'. I am using Entity Framework version 6 on SQL Server. The constructor of the DbContext (with the line that throws the exception) looks like this: internal TestHubContext(string connectionStringName) : base(connectionStringName) { var objectContext = (this as IObjectContextAdapter).ObjectContext; ... } The entities are created using code-first, and look like this: public class Order { [Key

Forgive me I am not good at EF6. If I make some mistake . Please help me to correct it. Thanks. Firstly I want to implement the business logic in my service layer like below. public class userService { void createWithCommit(User user) { MyEntityContext db= new MyEntityContext (); ... db.Users.add(user);//Add a new user entity .... Work w = new Work(); ... db.Works.add(w);//Add a new work entity db.savechanges();//commit the changes which will insert 2 new record . one is user . another is work. } } But in some service class I want to call multiple others service method in one transaction like

I have a projection function that I pass to IQueryable<>.Select() method: private static Expression<Func<VendorPrice, PriceItem>> GetPriceSelector(){ return e => new PriceItem { Id = e.Id, Price = Math.Round(e.Price, 4) }; } Everything works just fine but I want to parameterize it like that: private static Expression<Func<VendorPrice, PriceItem>> GetPriceSelector(Func<VendorPrice, decimal> formula){ return e => new PriceItem { Id = e.Id, Price = formula(e) }; } so that I can call it like prices.Select(GetPriceSelector(e => Math.Round(e.Price, 4))) Unfortunately, EF complains about it: The LINQ

I am using Entity Framework 6.0.0 with MySql Server 5.6.17 I have added MySql.Data.Entities through nuget and it installed Entity Framework 6.0.0 and MySql.Data 6.8.4 Everything was setup perfectly and working fine with some of my Business Entities. it have automigration enabled(true). Later i have added some more entities and then it started giving error like Table 'DBNAME.dbo.TABLENAME' doesn't exist Entity Framework 6 I have tried deleting whole database and recreate it again, but it didn't worked. I have tried updating Entity Framework to 6.1.2 and MySql.Data to 6.9.5 but it did not solved