Question

我尝试使用LinQ创建数据库结构。这些表互相引用。根据SO的提示，我目前有以下代码:(部分）

[Database]
public class SqlData : DataContext
{     
    public Table<Benutzer> Benutzers;      
    public Table<Standort> Standorts;

    public SqlData(string connectionString) : base(connectionString)   { }

    public void CreateDb()
    {            
        CreateDatabase();
    }
}

[Table(Name = "tqStandort")]
public class Standort
{
    [Column(IsPrimaryKey = true, DbType = "BigInt IDENTITY NOT NULL", IsDbGenerated = true, UpdateCheck = UpdateCheck.Never)]
    public int Id;
    [Column]
    public string Name;
}

[Table(Name = "tqBenutzer")]
public class Benutzer
{
    [Column(IsPrimaryKey = true, DbType = "BigInt IDENTITY NOT NULL", IsDbGenerated = true, UpdateCheck = UpdateCheck.Never)]
    public int Id;

    [Column(Name = "IdStandort")]
    private int? _idStandort;
    private EntityRef<Standort> _standort;

   [Association(Name = "FK_Benutzer_Standort", IsForeignKey = true, Storage = "_standort", ThisKey = "_idStandort")]
    public Standort IdStandort
    {
        get { return _standort.Entity; }
        set { _standort.Entity = value; }
    }
}

当调用CreateDatabase（）时，我收到以下错误：

部署步骤“激活功能”：列中发生错误 'tqStandort.Id'与引用列的数据类型不同外键'FK_Benutzer_Standort'中的'tqBenutzer.IdStandort'。可以不创建约束

我的错误在哪里？

（UPDATE）：这将是我想要实现的SQL结构：

CREATE TABLE [dbo].[tqStandort](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](50) NULL,
 CONSTRAINT [PK_tqStandort] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
CREATE TABLE [dbo].[tqBenutzer](
    [Id] [int] NOT NULL,
    [IdStandort] [int] NULL,
 CONSTRAINT [PK_tqBenutzer] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[tqBenutzer]  WITH CHECK ADD  CONSTRAINT [FK_tqBenutzer_tqStandort] FOREIGN KEY([IdStandort])
REFERENCES [dbo].[tqStandort] ([Id])

Answer 1

您在关联中使用的列应具有相同的类型。改为：

private long? _idStandort;

或：

[Table(Name = "tqStandort")]
public class Standort
{
    [Column(IsPrimaryKey = true, DbType = "Int IDENTITY NOT NULL", IsDbGenerated = true, UpdateCheck = UpdateCheck.Never)]
    public int Id;

    ...
}

使用Linq to SQL创建DataBase时出错

1 个答案: