shared-primary-key | 易学教程

Shared Primary Key

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问题 I would guess this is a semi-common question but I can't find it in the list of past questions. I have a set of tables for products which need to share a primary key index. Assume something like the following: product1_table: id, name, category, ...other fields product2_table: id, name, category, ...other fields product_to_category_table: product_id, category_id Clearly it would be useful to have a shared index between the two product tables. Note, the idea of keeping them separate is because

EF6 Table splitting vs shared primary key for multiple splits

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问题 I am upgrading a legacy database system into .NET + Entity Framework 6 (code-first POCO) + PostgreSQL. For ease of programming, I wish to split a large table (200+ fields) into multiple entities, eg.: Franchise FranchiseLegalEntity FranchiseBilling FranchiseSignup FranchiseAllocation FranchiseCompliance FranchiseMiscellaneous FranchiseNotifications I was delighted to find EF6 supports "table splitting": mapping a single table to multiple entities to split the fields up. However attempting to

Understanding ForeignKey attribute in entity framework code first

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问题 See the following post for some background: Entity framework one to zero or one relationship without navigation property I had always thought that ForeignKey was used to show which property in a class held the ForeignKey that determined the navigation property e.g. public class MemberDataSet { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public int? DeferredDataId { get; set; } [ForeignKey("DeferredDataId")] public virtual DeferredData

Understanding ForeignKey attribute in entity framework code first

阅读更多关于 Understanding ForeignKey attribute in entity framework code first

See the following post for some background: Entity framework one to zero or one relationship without navigation property I had always thought that ForeignKey was used to show which property in a class held the ForeignKey that determined the navigation property e.g. public class MemberDataSet { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public int? DeferredDataId { get; set; } [ForeignKey("DeferredDataId")] public virtual DeferredData DeferredData { get; set; } } However, I discovered on the linked post that this is not right and that as