我有以下 SQL 来创建表:
public const string dropCreate =
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
IF EXISTS (SELECT name FROM sys.objects WHERE name = 'Application' AND type = 'U')
DROP TABLE [dbo].[Application]
CREATE TABLE [dbo].[Application] (
[ApplicationId] INT IDENTITY (1, 1) NOT NULL,
[Name] NVARCHAR (50) Not NULL,
[RowVersion] [varbinary](max) NULL,
[ModifiedDate] [datetime] NOT NULL,
CONSTRAINT [PK_dbo.Application] PRIMARY KEY CLUSTERED ([ApplicationId] ASC)
)";
这是我的课:
public partial class Application
{
public Application()
{
this.TestAccounts = new List<TestAccount>();
}
public int ApplicationId { get; set; }
public string Name { get; set; }
public byte[] RowVersion { get; set; }
public System.DateTime ModifiedDate { get; set; }
public virtual ICollection<TestAccount> TestAccounts { get; set; }
}
映射:
public ApplicationMap()
{
// Primary Key
this.HasKey(t => t.ApplicationId);
// Properties
this.Property(t => t.Name)
.IsRequired()
.HasMaxLength(35);
this.Property(t => t.RowVersion)
.IsRequired()
.IsFixedLength()
.HasMaxLength(8)
.IsRowVersion();
// Table & Column Mappings
this.ToTable("Application");
this.Property(t => t.ApplicationId).HasColumnName("ApplicationId");
this.Property(t => t.Name).HasColumnName("Name");
this.Property(t => t.RowVersion).HasColumnName("RowVersion");
this.Property(t => t.ModifiedDate).HasColumnName("ModifiedDate");
}
我按如下方式插入:
new TestAccount
{
Application = app ,
Name = applicationName,
ModifiedDate = DateTime.Now
};
它给了我以下异常
InnerException: System.Data.Entity.Infrastructure.DbUpdateException HResult=-2146233087 消息=为“Relational.Mappings.Contexts.Application”类型的不可为空的成员“RowVersion”返回了一个空的存储生成值。来源=实体框架
有人可以给我一些建议吗?据我所知,我已经正确设置了所有内容。