16

我的控制器中有调用以下方法的操作：

public IQueryable<AaaUserContactInfo> getcontactinfo(long[] id)
{
    var organizationsiteids = from accountsitemapping in entities.AccountSiteMappings
                            where id.Any(accountid => accountsitemapping.ACCOUNTID == accountid)
                            select accountsitemapping.SITEID;

    var usersdepts = from userdept in entities.UserDepartments
                    join deptdefinition in entities.DepartmentDefinitions on userdept.DEPTID equals deptdefinition.DEPTID
                    where organizationsiteids.Any(accountid => deptdefinition.SITEID == accountid)
                    select userdept;

    var contactsinfos = from userdept in usersdepts
                    join contactinfo in entities.AaaUserContactInfoes on userdept.USERID equals contactinfo.USER_ID
                    select contactinfo;

    return  contactsinfos;
}

但是当我运行应用程序并导航到操作方法时，将在视图级别引发以下错误：-

System.Data.EntityCommandExecutionException was unhandled by user code
  HResult=-2146232004
  Message=An error occurred while executing the command definition. See the inner exception for details.
  Source=System.Data.Entity
  StackTrace:
       at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
       at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
       at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
       at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
       at System.Data.Entity.Internal.Linq.InternalQuery`1.GetEnumerator()
       at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator()
       at System.Linq.Enumerable.Count[TSource](IEnumerable`1 source)
       at ASP._Page_Views_Home_CustomersDetails_cshtml.Execute() in c:\Users\Administrator\Desktop\new app DEMO2\MvcApplication4 - LATEST -\MvcApplication4\Views\Home\CustomersDetails.cshtml:line 6
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
       at System.Web.WebPages.StartPage.RunPage()
       at System.Web.WebPages.StartPage.ExecutePageHierarchy()
       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
       at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)
       at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
       at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19()
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
  InnerException: System.Data.SqlClient.SqlException
       HResult=-2146232060
       Message=Some part of your SQL statement is nested too deeply. Rewrite the query or break it up into smaller queries.
       Source=.Net SqlClient Data Provider
       ErrorCode=-2146232060
       Class=15
       LineNumber=105
       Number=191
       Procedure=""
       StackTrace:
            at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
            at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
            at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
            at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
            at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
            at System.Data.SqlClient.SqlDataReader.get_MetaData()
            at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
            at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
            at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
            at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
            at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
            at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
            at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
            at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
       InnerException:

那么是什么导致了这个错误呢？？

更新：- 在此处输入图像描述

4

2 回答 2

18

LINQ 的大多数命令都采用延迟执行。它会一直等到您实际调用数据，然后再将查询发送到该数据库。在这里，看起来所有这些查询都被推迟到稍后，当您尝试从contactInfos 中获取某些内容时。

我会尝试让它执行，比如在某个地方抛出一个 .ToList() ，以尝试减少 SQL 中否则会发生的嵌套。

编辑：由于根据评论，您似乎在第一次查询时遇到了错误，您能否尝试并让它说出来where id.Contains(accountsitemapping.ACCOUNTID)？

于 2013-01-04T19:19:08.683 回答
5

为了将来参考，您可以使用以下命令记录生成的 SQL：

var db = new DbContext();
db.Database.Log = Console.Write;

这将使您能够确定哪个部分嵌套得更深。从那里，您可能必须重新编写查询以在第二步中加载昂贵的计算。或者考虑将其编写为存储过程。

于 2015-09-22T14:19:28.670 回答