我必須在我們的框架中管理併發性,但我無法生成DbUpdateConcurrencyException。我們使用SQL Server 2008,EF 6和AutoMapper 5併發訪問,爲什麼EntityFramework 6不會生成DbUpdateConcurrencyException?
SQL
ALTER TABLE [Keyword].[Keyword] ADD Rowversion [Rowversion] NOT NULL
型號
[Table("Keyword", Schema = "Mailing")]
public class KeywordModel : _Auditable
{
[Key]
public int KeywordId { get; set; }
public string Name { get; set; }
public string Hashtag { get; set; }
public string Namespaces { get; set; }
public string Html { get; set; }
[Timestamp]
[ConcurrencyCheck]
public virtual byte[] RowVersion { get; set; }
}
視圖模型
public class KeywordEditViewModel
{
[HiddenInput(DisplayValue = false)]
public int KeywordId { get; set; }
[Display(Name = "Name")]
public string Name { get; set; }
[Display(Name = "Hashtag")]
public string Hashtag { get; set; }
[Display(Name = "Namespaces")]
[Description("Separate namespaces by ','")]
public string Namespaces { get; set; }
[Required]
[AllowHtml]
[UIHint("MultilineText")]
[Display(Name = "Html")]
[Description("Prefix or sufix your razor variables with #")]
public string Html { get; set; }
[Timestamp]
[ConcurrencyCheck]
public byte[] RowVersion { get; set; }
}
控制器
[HttpPost]
public virtual ActionResult Edit(KeywordEditViewModel model, string @return)
{
var data = new JsonResultData(ModelState);
if (ModelState.IsValid)
{
data.RunWithTry((resultData) =>
{
KeywordManager.Update(model.KeywordId, model, CurrentUser.UserId);
resultData.RedirectUrl = !string.IsNullOrEmpty(@return) ? @return : Url.Action("Index");
});
}
return Json(data);
}
個
業務
public KeywordModel Update(int id, object viewmodel, int userId)
{
var model = Get(id);
Mapper.Map(viewmodel, model);
SaveChanges("Update mailing keyword", userId);
return model;
}
AutoMapper
CreateMap<KeywordModel, KeywordEditViewModel>();
CreateMap<KeywordEditViewModel, KeywordModel>();
在我的測試中,RowVersion領域在數據庫中不同的值,但SaveChange不會產生異常DbUpdateConcurrencyException。
SQL跟蹤
UPDATE [Mailing].[Keyword]
SET [Namespaces] = @0, [audit_LastUpdate] = @1
WHERE (([KeywordId] = @2) AND ([RowVersion] = @3))
SELECT [RowVersion]
FROM [Mailing].[Keyword]
WHERE @@ROWCOUNT > 0 AND [KeywordId] = @2
@0: 'titi' (Type = String, Size = -1)
@1: '09/11/2016 13:35:54' (Type = DateTime2)
@2: '1' (Type = Int32)
@3: 'System.Byte[]' (Type = Binary, Size = 8)
檢查該更新生成的sql(context.Database.Log = ...) – Evk
您在視圖中有類似於@ Html.HiddenFor(m => m.RowVersion)的東西嗎? (我不知道automapper)所以,如果你保存,它就像你之前加載的rowversion一樣? –
是的,在我看來,我有一個隱藏的輸入'RowVersion'。就在'SaveChange'之前,我的對象中的值與數據庫值不同,但更新正常工作... –