实体框架4获取插入记录的主键ID

Question

I am using the Entity Framework for inserting a row into my sql database. If I was to be using a stored procedure then I would be able to return the primary key for the record which I had inserted.

Am I able to do return the PK for the last my last record inserted using the Entity Framework?

Answer 1

插入实体后，应该已对其进行了更新，以便映射到数据库中主键的属性具有新的PK值。

Answer 2

Yes of course you can do this. See example:

int id = 0;

using (PC2Entities objectContext = new PC2Entities())
{
   objectContext.ClientContacts.AddObject(clientContact);
   objectContext.SaveChanges();
   id = clientContact.Id;

   transaction.Complete();
}

id is the PK.

Answer 3

For Oracle.ManagedDataAccess.EntityFramework (version 6.121 or older)

If you still do not get the ID after inserting, then add this attribute on the primary key property.

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
 public string ID { get; set; }

I had to do this, don't know why, may be because I am using oracle and entity framework is not happy about that.

Edit: I see this answer is down voted, and I know why, because the latest version of ODAP doesn't require you to put the [DatabaseGenerated(DatabaseGeneratedOption.Identity)]. But this was true for the older versions.