ef-code-first

问题 I am using the Entity Framework code first for data access and I have a Company class which has a collection of Employees. The Employee class also has a Company property. I would like to be able to serialize a Company and include the list of employees in the serialization. Here is Company: public class Company { public long Id { get; set; } public string Name { get; set; } public DateTime? Established { get; set; } public virtual IList<Employee> Employees { get; set; } public DateTime?

问题 I am using Entity Framework Code First in my current project. A Database consists of many tables, many views, and many functions. I am able to create tables using Entity Framework Code First. But I am unable to find a way to create stored procedures using Entity Framework Code First. I know Database-First strategy will fulfill my requirement and everything works well, but I don’t want to use Database-First strategy into my existing project code. Please help me someone, what are the best ways

问题 I am using Entity Framework Code First in my current project. A Database consists of many tables, many views, and many functions. I am able to create tables using Entity Framework Code First. But I am unable to find a way to create stored procedures using Entity Framework Code First. I know Database-First strategy will fulfill my requirement and everything works well, but I don’t want to use Database-First strategy into my existing project code. Please help me someone, what are the best ways

问题 In this blog post: EF4 Code First Control Unicode and Decimal Precision, Scale with Attributes, Dane Morgridge used attributes to control the creation of different types on your database. ...And I found this pretty unique BTW!!! How do I generate money type fields in my resulting database using code first API of EF CTP5, if is possible to do it from your model, using conventions or attributes? Sorry about my English is not my main language. Thanks in advance. 回答1: For example, consider this

问题 All my models contain at least two associations. When modeling this in ef4 I've only been able to do this without a second Foreign Key property through the use of the fluent interface. ForeignKey seems like the right attribute to use, except for the fact that it requires a string parameter. So my question is, can you have a navigational property and declare it as such using an attribute? public class User : IAuditable { // other code public virtual User Creator { get; set; } public virtual

问题 I have a User < Country model. A user belongs to a country, but may not belong to any (null foreign key). How do I set this up? When I try to insert a user with a null country, it tells me that it cannot be null. The model is as follows: public class User{ public int CountryId { get; set; } public Country Country { get; set; } } public class Country{ public List<User> Users {get; set;} public int CountryId {get; set;} } Error: A foreign key value cannot be inserted because a corresponding

问题 I'm attempting to do the following: public class class1 { public int Id {get;set;} [ForeignKey("Class2")] public int Class2Id {get;set;} public virtual Class2 Class2 {get;set;} } public class class2 { public int Id { get; set;} [Required] public virtual int Class1Id {get;set;} [Required] [ForeignKey("Class1Id")] public Class1 Class1 {get;set;} } However every time I try to migrate my database I get the following error: Class1_Class2_Target: : Multiplicity is not valid in Role 'Class2_Class1

问题 I have imported database tables from MS SQL Server 2012 and migrated them to Visual Studio 2015 using code-first concept shown in this example. Its working but just now i just added a new table in SQL Server and i wanted to update the DBContext in my project with the new table. I tried entering "add-migration new_table_name" in the Package Manager Console but it didn't work. I understand that i have to code a new model manually in the Models folder of my project, then only that migration will

问题 So im looking to improve my code abit. I currently have two models and two tables that are connected fk and pk. I want to insert new attributes into my two tables, but in that same instant, i want to set the fk in my db called USERS . Currently i cant find another way other than this: using (db) { var encryptedPassword = PasswordStorage.CreateHash(model.Users.PASSWORD); var user = db.USERS.Create(); user.EMAIL = model.Users.EMAIL; user.PASSWORD = encryptedPassword; user.NAME = model.Users

问题 I have a class customer that contains address properties, phone properties and fax properties, but I want to take off the address, phone properties to complex types. Does properties are already in the database as columns. [Table("tblCustomer")] public partial class Customer : Entity { [Key] public int CustomerID { get; set; } [StringLength(10)] public string CustomerCode { get; set; } [StringLength(60)] public string AddressLine1 { get; set; } [StringLength(70)] public string AddressLine2 {