entity-framework

问题 I'm using Entity Framework 4.1 with MySql and having a problem with the eager loading of a many to many relationship. A simplified version of the affected tables looks like: CabinCategory - CabinCategoryId CabinGrade - CabinGradeId, CabinCategoryId Deck - DeckId DeckCabinGrades - DeckId, CabinGradeId <--- Join table I'm ultimately trying to access CabinCategory.CabinGrade.Deck I think I've managed to map this successfully using modelBuilder.Entity<CabinGrade>() .HasMany(c => c.Decks)

问题 I'm using Entity Framework 4.1 with MySql and having a problem with the eager loading of a many to many relationship. A simplified version of the affected tables looks like: CabinCategory - CabinCategoryId CabinGrade - CabinGradeId, CabinCategoryId Deck - DeckId DeckCabinGrades - DeckId, CabinGradeId <--- Join table I'm ultimately trying to access CabinCategory.CabinGrade.Deck I think I've managed to map this successfully using modelBuilder.Entity<CabinGrade>() .HasMany(c => c.Decks)

问题 I'm having a little difficulty getting Entity Framework 5 Enums to map to an integer column in a migration. Here's what the code looks like: [Table("UserProfile")] public class UserProfile { public enum StudentStatusType { Student = 1, Graduate = 2 } [Key] public int UserId { get; set; } public string UserName { get; set; } public string FullName { get; set; } public StudentStatusType Status { get; set; } } The migration looks like this: public partial class EnumTest : DbMigration { public

问题 This question is about this code: entityEntry.Property("WhateverProperty").CurrentValue = 1; I answered this question yesterday and if you notice in the comments to the question (not the answer), one of the members @gertarnold said this: entityEntry.Property("InsertedBy") doesn't use reflection, it reads the EF metadata. Sure it uses the EF metadata to figure out if the entity has that property but I am pretty sure somewhere down the line they would have to use reflection to set the property

问题 Sorry for this being so long, but at least I think I got all info to be able to understand and maybe help? I would like to load data from my database using eager loading. The data is set up in five tables, setting up two Levels of m:n relations. So there are three tables containing data (ordered in a way of hierarchy top to bottom): CREATE TABLE [dbo].[relations]( [relation_id] [bigint] NOT NULL ) CREATE TABLE [dbo].[ways]( [way_id] [bigint] NOT NULL ) CREATE TABLE [dbo].[nodes]( [node_id]

问题 recently I discover that EF doesn't update nested object. For few days I try to figure out how to do this but unfortunately I'm stuck with this problem. I have Object public class ProjectEntity : AuditableEntity<int> { public string CustumerCompany { get; set; } public string CustomerRepresentative { get; set; } public string ProjectTitle { get; set; } public string WwsNumber { get; set; } [ForeignKey("ParentProjectId")] public virtual ProjectEntity ParentProject { get; set; } public int?

问题 I'm trying to save a graph into a database as described here with EF Code First. I defined property with collection of adjacent nodes: public class Node { public int NodeId { get; set; } public string NodeName { get; set; } public ICollection<Node> Nodes { get; set; } } but EF generated only one table for this model: dbo.Nodes NodeId (PK, int, not null) NodeName (nvarchar(max), null) Node_NodeId (FK, int, null) How to force EF to generate many-to-many relationship? Are there any other ways to

问题 I'm trying to save a graph into a database as described here with EF Code First. I defined property with collection of adjacent nodes: public class Node { public int NodeId { get; set; } public string NodeName { get; set; } public ICollection<Node> Nodes { get; set; } } but EF generated only one table for this model: dbo.Nodes NodeId (PK, int, not null) NodeName (nvarchar(max), null) Node_NodeId (FK, int, null) How to force EF to generate many-to-many relationship? Are there any other ways to

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 months ago . We have a single database with multiple schemas. Company architect wants to have Entity Framework DbContext for each schema. Additionally, foreign key relationships exist between different schemas. In scaffolding a schema today, received this error: Error: For foreign key FK

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 months ago . We have a single database with multiple schemas. Company architect wants to have Entity Framework DbContext for each schema. Additionally, foreign key relationships exist between different schemas. In scaffolding a schema today, received this error: Error: For foreign key FK