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[英]Autogenerate GUID column that is not a primary key in Entity Framework
[英]Entity Framework SaveChanges(): Value of primary key column not being sent in
我剛開始嘗試使用Entity Framework。 我創建了一個像這樣的表:
CREATE TABLE WORK_EFFORT
(
K__ID BIGINT,
NAME NTEXT,
DESCRIPTION NTEXT
)
我也定了
K__ID
成為主鍵。
回到我的業務層,當我運行以下代碼時,
var db = new ENTERPRISE_context();
var workEffort = new WORK_EFFORT
{
K__ID = 1,
NAME = "merhaba, dünya",
DESCRIPTION = "merhaba, dünya"
};
db.WORK_EFFORT_set.Add(workEffort);
db.SaveChanges();
我得到了
Cannot insert the value NULL into column 'K__ID', table 'ENTERPRISE.dbo.WORK_EFFORT'; column does not allow nulls. INSERT fails.
The statement has been terminated.
錯誤。 SQL分析顯示以下RPC發送到SQL Server:
exec sp_executesql N'INSERT [dbo].[WORK_EFFORT]([NAME], [DESCRIPTION])
VALUES (@0, @1)
SELECT [K__ID]
FROM [dbo].[WORK_EFFORT]
WHERE @@ROWCOUNT > 0 AND [K__ID] = scope_identity()',N'@0 nvarchar(max) ,@1 nvarchar(max) ',@0=N'merhaba, dünya',@1=N'merhaba, dünya'
為了您的信息,上面的支持代碼是這樣的:
namespace Web.Models
{
public partial class WORK_EFFORT
{
public long K__ID { get; set; }
public string NAME { get; set; }
public string DESCRIPTION { get; set; }
}
}
namespace Web.Models.Mapping
{
public partial class WORK_EFFORT_map : EntityTypeConfiguration<WORK_EFFORT>
{
public WORK_EFFORT_map()
{
this.HasKey(t => t.K__ID);
this.ToTable("WORK_EFFORT");
this.Property(t => t.K__ID).HasColumnName("K__ID");
this.Property(t => t.NAME).HasColumnName("NAME");
this.Property(t => t.DESCRIPTION).HasColumnName("DESCRIPTION");
}
}
}
namespace Web.Models
{
public partial class ENTERPRISE_context : DbContext
{
static ENTERPRISE_context()
{
Database.SetInitializer<ENTERPRISE_context>(null);
}
public ENTERPRISE_context() : base("Name=ENTERPRISE_context") { }
public DbSet<WORK_EFFORT> WORK_EFFORT_set { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new WORK_EFFORT_map());
}
}
}
根據你的SQL插入語句,EF認為K__ID是一個錯誤的標識列。 在映射的以下行中指定HasDatabaseGeneratedOption,並指定None:
Property(t => t.K__ID).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
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