我对EF很新,所以我希望这不是一个愚蠢的问题。我搜索过,但找不到与我的问题相关的任何内容。
我在使用EF6建模现有数据库时遇到了问题。我有TPT继承设置如下:
TPT model 由于创建模型的问题,我必须手动添加BAMS * Environment表。在将BAMSPortalEnvironment中的外键添加到BAMSPrimeEnvironment之前,一切都很好。对于给定的Prime环境,可能有也可能没有Portal环境,但是对于每个Portal环境,都有Prime环境 我从VS2017收到以下错误:
运行转换:多重性在角色' BAMSPortalEnvironment'中无效。在关系&FK_BAMSPortalEnvironment_BAMSPrimeEnvironment'。由于Dependent Role属性不是关键属性,因此Dependent Role的多重性的上限必须为*。
相关表格的简化模型:
CREATE TABLE dbo.Environment(
EnvironmentId int IDENTITY(1,1) NOT NULL,
EnvironmentTypeId char(1) NOT NULL,
[Description] varchar(64) NOT NULL,
CONSTRAINT UQ_Environment UNIQUE NONCLUSTERED (EnvironmentId ASC) ON [PRIMARY],
CONSTRAINT PK_Environment PRIMARY KEY CLUSTERED (EnvironmentId ASC, EnvironmentTypeId ASC) ON [PRIMARY]
) ON [PRIMARY];
CREATE TABLE dbo.BAMSPrimeEnvironment(
EnvironmentId int NOT NULL,
EnvironmentTypeId AS CAST('B' AS char(1)) PERSISTED NOT NULL,
CONSTRAINT FK_BAMSPrimeEnvironment_Environment FOREIGN KEY (EnvironmentId, EnvironmentTypeId) REFERENCES dbo.Environment (EnvironmentId, EnvironmentTypeId) ON UPDATE NO ACTION ON DELETE CASCADE,
CONSTRAINT PK_BAMSPrimeEnvironment PRIMARY KEY CLUSTERED (EnvironmentId ASC, EnvironmentTypeId ASC) ON [PRIMARY]
) ON [PRIMARY];
CREATE TABLE dbo.BAMSPortalEnvironment(
EnvironmentId int NOT NULL,
EnvironmentTypeId AS CAST('P' AS char(1)) PERSISTED NOT NULL,
BAMSPrimeId int NOT NULL,
BAMSPrimeTypeId AS CAST('B' AS char(1)) PERSISTED NOT NULL,
CONSTRAINT FK_BAMSPortalEnvironment_BAMSPrimeEnvironment FOREIGN KEY (BAMSPrimeId, BAMSPrimeTypeId) REFERENCES dbo.BAMSPrimeEnvironment (EnvironmentId, EnvironmentTypeId) ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT FK_BAMSPortalEnvironment_Environment FOREIGN KEY (EnvironmentId, EnvironmentTypeId) REFERENCES dbo.Environment (EnvironmentId, EnvironmentTypeId) ON UPDATE NO ACTION ON DELETE CASCADE,
CONSTRAINT UQ_BAMSPortalEnvironment_BAMSPrimeId_BAMSPrimeTypeId UNIQUE NONCLUSTERED (BAMSPrimeId ASC, BAMSPrimeTypeId ASC) ON [PRIMARY],
CONSTRAINT PK_BAMSPortalEnvironment PRIMARY KEY CLUSTERED (EnvironmentId ASC, EnvironmentTypeId ASC) ON [PRIMARY]
) ON [PRIMARY];
我可以"修复"通过改变" 0..1"到" *",但这并不能准确描述我的模型。我错过了什么让这个工作?
这是我的第一篇文章,如果您需要其他信息,请与我们联系。
谢谢!
答案 0 :(得分:0)
我无法找到解决方案,因此我改为引用BAMSPrimeEnvironment而不是BAMSPortalEnvironment,而是将其更改为引用环境,这解决了这个问题。