Question

我有2个表，REGISTRATION和STATUS_CODE

CREATE TABLE [dbo].[REGISTRATION](
   [REG_ID] [numeric](18, 0) IDENTITY(1,1) NOT NULL PRIMARY KEY,
   [TYPE] [char](1),
   [CREDIT_STATUS] [varchar](4) NULL,
   [CREDIT_STATUS2] [varchar](4) NULL,
   [CREDIT_STATUS_TEMP]  AS (case when [TYPE] = '1' then [CREDIT_STATUS] when [TYPE] = '2' then [CREDIT_STATUS2] end)
 )

CREATE TABLE [dbo].[STATUS_CODE](
    [STATUS_CODE] [varchar](4) NOT NULL PRIMARY KEY,
    [STATUS_DESC] [varchar](10),
)

我的最终目标是使用EF

运行以下查询

SELECT REG.REG_ID, STS.STATUS_DESC FROM [dbo].[REGISTRATION] REG
INNER JOIN [dbo].[STATUS_CODE] STS
ON REG.CREDIT_STATUS_TEMP = STS.STATUS_CODE
WHERE STS.STATUS_DESC LIKE '%FAILED%'

在C＃中，我在REGISTRATION类中为计算列

提供了以下注释

...
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
[ForeignKey("CreditStatusTemp")]
[StringLength(4)]
public string CREDIT_STATUS_TEMP { get; private set; }

public virtual STATUSC_CODE CreditStatusTemp { get; set; }
...

但是，每当我尝试保存REGISTRATION记录时。我会遇到这个错误。

{"A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'CREDIT_STATUS_TEMP'."}

我知道我需要FK注释才能执行查询，但我不确定如何正确执行。请帮忙，谢谢。

如何在Entity Framework中映射计算列的外键

0 个答案: