实体框架：从代码优先存储过程插入返回 GUID？

Question

我有一个 InsertPerson 存储过程，我需要它将 GUID（唯一标识符）返回到我正在创建的个人对象中。这甚至可以通过实体框架代码优先实现吗？我已经尝试了一切，实体框架忽略了我试图使用输出参数返回的 guid。如果可能的话，有人举个例子吗？

Person.cs：

public class Person
{
   public Guid Id { get; set; }
   public string FirstName { get; set; }
}

存储过程：

CREATE PROCEDURE [dbo].[InsertPerson]
    @KeyPlayerId UNIQUEIDENTIFIER ,
    @FirstNameNVARCHAR(255) 
AS

-- Perform Insert
insert into [dbo.].[Person]....

-- Return GUID
select @Id as [Id];

END;

Answer 1

我能够通过告诉实体框架 Id 是数据库生成的值来完成它。我将 Insert 过程映射到 PersonMap 类中的 InsertPerson，并在 OnModelCreating 方法中创建模型时使用它。在存储过程中，我生成一个新的 Id 并将其传递回实体框架。希望这会有所帮助！

PersonMap.cs

public class PersonMap : EntityTypeConfiguration<Person>
{
    public PersonMap()
    {
        // Primary Key
        this.HasKey(t => t.Id);

        // Tell Entity Framework the database will generate the key.
        this.Property(t => t.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        // Properties
        this.Property(t => t.FirstName)
            .IsRequired()
            .HasMaxLength(255);

        //Map to Stored Procedure
        this.MapToStoredProcedures(s => s.Insert(i => i.HasName("InsertPerson")));
    }
}

OnModelCreating

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new PersonMap());            
    }

插入人员存储过程

CREATE PROCEDURE InsertPerson 
-- Since Id is marked as Database Generated we only need 
-- a parameter for First Name
@FirstName nvarchar(255) = 0 
AS
-- Variable to hold new Id
DECLARE @Id uniqueidentifier

-- Generate a new Id using NEWID function that returns a unique identifier
SET @Id = NEWID()

-- Perform Insert
INSERT INTO [dbo].[Person] VALUES (@Id, @FirstName)

-- Return the Id to Entity Framework
SELECT @Id AS 'Id'

Answer 2

我认为这可能对你有帮助：

var sqlConnection1 = new SqlConnection("Your Connection String");
var cmd = new SqlCommand();
var reader;

cmd.CommandText = "StoredProcedureName";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Connection = sqlConnection1;

sqlConnection1.Open();

reader = cmd.ExecuteReader();
rdr = cmd.ExecuteReader();
var outputValue = Guid.Parse(cmd.Parameters["@Response"].Value.ToString());

sqlConnection1.Close();