Question

我有两个名为Seminari和Predbiljezbe的表。

当我在表Predbiljezbe中创建新数据行时，我希望该行采用表Seminari的主键并将其插入表Predbiljezbe中。

我希望我说的很清楚，请注意，由于我是编程新手，非常感谢您。我为我的英语不好而道歉。

这是我的代码：

控制器：

    public ActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(Predbiljezbe predbiljezbePrijava)
    {
        if (ModelState.IsValid)
        {
            context.Predbiljezbes.Add(predbiljezbePrijava);
            context.SaveChanges();

            return RedirectToAction("Index");
        }
        return View(predbiljezbePrijava);
    }

实体模型：

public partial class SeminariEntities1 : DbContext
{
    public SeminariEntities1()
        : base("name=SeminariEntities1")
    {
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<Predbiljezbe> Predbiljezbes { get; set; }
    public virtual DbSet<Seminari> Seminaris { get; set; }
}

Predbiljezbe模型：

public partial class Predbiljezbe
{
    public int IdPredbiljezba { get; set; }
    public string Ime { get; set; }
    public string Prezime { get; set; }
    public string Datum { get; set; }
    public string Adresa { get; set; }
    public string Email { get; set; }
    public string Telefon { get; set; }
    public bool Status { get; set; }
    public Nullable<int> IdSeminara { get; set; }
    public Nullable<int> BrojPolaznika { get; set; }

    public virtual Seminari Seminari { get; set; }
}

Seminari模型：

public partial class Seminari
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public Seminari()
    {
        this.Predbiljezbes = new HashSet<Predbiljezbe>();
    }

    public int IdSeminar { get; set; }
    public string Naziv { get; set; }
    public string Opis { get; set; }
    public System.DateTime Datum { get; set; }
    public Nullable<bool> Popunjen { get; set; }
    public string Predavač { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<Predbiljezbe> Predbiljezbes { get; set; }
}

Answer 1

我的方法是使用双重方法：

要插入数据库并返回ID
使用上面的ID插入依赖子项

[HttpPost]
    public ActionResult Create(Predbiljezbe predbiljezbePrijava)
    {
        if (ModelState.IsValid)
        {
           //add your first obj
            context.Predbiljezbes.Add(predbiljezbePrijava);
            context.SaveChanges();

            //after saving in db its Id is automatically reflected in the object that you inserted
            if(predbiljezbePrijava.Id != 0){ 
               var seminariobj = new Seminari{ //insert your data }

               // defining parentId into child
               seminariobj.predbiljezbePrijavaId = predbiljezbePrijava.Id;

              //save child obj
               context.Seminari.Add(seminariobj);
            context.SaveChanges();


            }

            return RedirectToAction("Index");
        }
        return View(predbiljezbePrijava);
    }

Answer 2

我尝试了您的建议，但无法将解决方案应用于我的问题，

也许我在设置表格和表格之间的关系时出现了错误。

这是我的SQL查询，如何设置数据库中的表：

Seminari：

CREATE TABLE [dbo].[Seminari] (
[IdSeminar] INT            IDENTITY (1, 1) NOT NULL,
[Naziv]     NVARCHAR (MAX) NOT NULL,
[Opis]      NVARCHAR (MAX) NULL,
[Datum]     DATE           NOT NULL,
[Popunjen]  BIT            NOT NULL,
[Predavač]  NVARCHAR (50)  NULL,
PRIMARY KEY CLUSTERED ([IdSeminar] ASC)

）;

Predbilježbe：

CREATE TABLE [dbo].[Predbiljezbe] (
[IdPredbiljezba] INT            IDENTITY (1, 1) NOT NULL,
[Ime]            NVARCHAR (MAX) NOT NULL,
[Prezime]        NVARCHAR (MAX) NOT NULL,
[Datum]          NVARCHAR (MAX) NOT NULL,
[Adresa]         NVARCHAR (MAX) NOT NULL,
[Email]          NVARCHAR (MAX) NULL,
[Telefon]        VARCHAR (MAX)  NULL,
[Status]         NVARCHAR (50)  NULL,
[BrojPolaznika]  INT            NULL,
[IdSeminara]     INT            NULL,
CONSTRAINT [PK_Predbiljezbe] PRIMARY KEY CLUSTERED ([IdPredbiljezba] ASC),
CONSTRAINT [FK_Predbiljezbe_ToTable] FOREIGN KEY ([IdSeminara]) REFERENCES [dbo].[Seminari] ([IdSeminar])

）;

再次，我想要的是在“ Predbiljezbe”中创建新行时，[IdSeminara]列采用表“ Seminari”中的主键[IdSeminar]的值！

主键以及与ASP.NET MVC应用程序中的表的关系

2 个答案: