c# - 在保存到数据库方法之后，存储库模式应该如何更新对象的 ID？

Question

在内存中创建我的 POCO 后，我调用存储库对象的 Save 方法。然后我需要使用保存操作期间创建的数据库 ID 更新 POCO。我应该使用 ref 传递对象，简单地让保存方法返回 ID 并从调用页面手动更新对象，还是什么？

下面是一些示例代码:

public GiftCertificateModel
{
    public int GiftCerticiateId {get;set;}
    public string Code {get;set;}
    public decimal Amount {get;set;}
    public DateTime ExpirationDate {get;set;}

    public bool IsValid()
    {}
}




public GiftCertificateRepository
{

    public GiftCertificateModel GetById(int GiftCertificateId)
    {
        //call db to get one and return single model
    }

    public List<GiftCertificateModel> GetMany()
    {
        //call db to get many and return list
    }

    public string GetNewUniqueCode()
    {
        //randomly generates unique code
        return code;
    }

    public GiftCertificateModel CreateNew()
    {
        GiftCertificateModel gc = new GiftCertificateModel();
        gc.Code = GetNewUniqueCode();
        return gc;
    }


    //should this take by ref or just return the id or return a full new model?
    public void Save(GiftCertificateModel gc)
    {
        //call db to save
    }
}

GiftCertificateRepository gcRepo = new GiftCertificateRepository();
GiftCertificateModel gc = gcRepo.CreateNew();
gc.Amount = 10.00M;
gc.ExpirationDate = DateTime.Today.AddMonths(12);
gc.Notes = "Test GC";
gcRepo.Save(gc);

Answer 1

Repository 应该保存您的 POCO，因此只需在保存对象和调用方法后通过查询 Id 将 gc.Id 填入 Save 方法会看到的。

GiftCertificateRepository gcRepo = new GiftCertificateRepository();
GiftCertificateModel gc = gcRepo.CreateNew();
gc.Amount = 10.00M;
gc.ExpirationDate = DateTime.Today.AddMonths(12);
gc.Notes = "Test GC";
gcRepo.Save(gc);
int Id = gc.Id; // Save populate the Id