[英]One-to-one becomes one-to-many Entity Framework generating database-first
我首先生成Entity Framework数据库(来自数据库的EF Designer)。 我在Microsoft SQL Server中有两个表:
CREATE TABLE dbo.Person
(
Pk_Person_Id INT IDENTITY PRIMARY KEY,
Name VARCHAR(255),
EmailId VARCHAR(255),
);
CREATE TABLE dbo.PassportDetails
(
Pk_Passport_Id INT PRIMARY KEY,
Passport_Number VARCHAR(255),
Fk_Person_Id INT UNIQUE
FOREIGN KEY REFERENCES dbo.Person(Pk_Person_Id)
);
INSERT INTO dbo.Person
VALUES ('Niraj','v.a@emails.com'),
('Vishwanath','v.v@emails.com'),
('Chetan','c.v@emails.com');
GO
INSERT INTO dbo.PassportDetails
VALUES (101, 'C3031R33', 1), (102, 'VRDK5695', 2), (103, 'A4DEK33D', 3);
GO
SELECT * FROM dbo.Person
SELECT * FROM dbo.PassportDetails;
在SQL Server中,关系显示为一对一,因为Fk_Person_Id
设置为isUnique = true
:
Fk_Person_Id INT UNIQUE
FOREIGN KEY REFERENCES dbo.Person(Pk_Person_Id));
现在在Visual Studio中,我从数据库中添加了一个新的ADO.NET实体数据模型 - > EF Designer - >选择这两个表并默认保留所有复选框选项。
生成结束后,我在Visual Studio图中看到了这个.edmx
:
这种关系已经改变为一对多 - 为什么? 这是错的吗? 我不希望一个人拥有一系列护照 - 这不是我试图描述的逻辑。
和EF代码:
public partial class Person
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public Person()
{
this.PassportDetails = new HashSet<PassportDetail>();
}
public int Pk_Person_Id { get; set; }
public string Name { get; set; }
public string EmailId { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<PassportDetail> PassportDetails { get; set; }
}
public partial class PassportDetail
{
public int Pk_Passport_Id { get; set; }
public string Passport_Number { get; set; }
public Nullable<int> Fk_Person_Id { get; set; }
public virtual Person Person { get; set; }
}
上下文
public partial class LightCRMEntities : DbContext
{
public LightCRMEntities() : base("name=LightCRMEntities")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public virtual DbSet<PassportDetail> PassportDetails { get; set; }
public virtual DbSet<Person> People { get; set; }
}
好吧,在数据库模型编辑器( .edmx
文件编辑器)中,通过单击关系(实体daigrams之间的箭头),您可以以这种方式配置其属性,使其为1对1(它不会更改您的数据库) !),但随后您可以生成创建此类数据库所需的代码。 结果,我得到以下内容:
-- --------------------------------------------------
-- Creating all tables
-- --------------------------------------------------
-- Creating table 'PassportDetails'
CREATE TABLE [dbo].[PassportDetails] (
[Pk_Passport_Id] int NOT NULL,
[Passport_Number] varchar(255) NULL
);
GO
-- Creating table 'Person'
CREATE TABLE [dbo].[Person] (
[Pk_Person_Id] int IDENTITY(1,1) NOT NULL,
[Name] varchar(255) NULL,
[EmailId] varchar(255) NULL
);
GO
-- --------------------------------------------------
-- Creating all PRIMARY KEY constraints
-- --------------------------------------------------
-- Creating primary key on [Pk_Passport_Id] in table 'PassportDetails'
ALTER TABLE [dbo].[PassportDetails]
ADD CONSTRAINT [PK_PassportDetails]
PRIMARY KEY CLUSTERED ([Pk_Passport_Id] ASC);
GO
-- Creating primary key on [Pk_Person_Id] in table 'Person'
ALTER TABLE [dbo].[Person]
ADD CONSTRAINT [PK_Person]
PRIMARY KEY CLUSTERED ([Pk_Person_Id] ASC);
GO
-- --------------------------------------------------
-- Creating all FOREIGN KEY constraints
-- --------------------------------------------------
-- Creating foreign key on [Pk_Passport_Id] in table 'PassportDetails'
ALTER TABLE [dbo].[PassportDetails]
ADD CONSTRAINT [FK__PassportD__Pk_Pa__5BE2A6F2]
FOREIGN KEY ([Pk_Passport_Id])
REFERENCES [dbo].[Person]
([Pk_Person_Id])
ON DELETE NO ACTION ON UPDATE NO ACTION;
GO
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