INSERT語句與使用ASP.net中的Ajax的FOREIGN KEY約束衝突MVC5

Question

我收到以下錯誤。使用MVC5，EF6和web api的 。

INSERT語句與FOREIGN KEY約束「FK_dbo.Attendances_dbo.Gigs_GigId」衝突。衝突發生在數據庫「aspnet-GigHub-20170521125426」，表「dbo.Gigs」，列'Id'中。

{System.Data.Entity.Infrastructure.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.Entity.Core.UpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Attendances_dbo.Gigs_GigId". The conflict occurred in database "aspnet-GigHub-20170521125426", table "dbo.Gigs", column 'Id'. 
The statement has been terminated. 
    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.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption) 
    at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest) 
    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) 
    at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) 
    at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() 
    at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<NonQuery>b__0(DbCommand t, DbCommandInterceptionContext`1 c) 
    at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) 
    at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext) 
    at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() 
    at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary`2 identifierValues, List`1 generatedValues) 
    at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() 
    --- End of inner exception stack trace --- 
    at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() 
    at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter. <Update>b__2(UpdateTranslator ut) 
    at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func`2 updateFunction) 
    at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update() 
    at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__35() 
    at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) 
    at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction) 
    at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass2a.<SaveChangesInternal>b__27() 
    at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation) 
    at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction) 
    at System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options) 
    at System.Data.Entity.Internal.InternalContext.SaveChanges() 
    --- End of inner exception stack trace --- 
    at System.Data.Entity.Internal.InternalContext.SaveChanges() 
    at System.Data.Entity.Internal.LazyInternalContext.SaveChanges() 
    at System.Data.Entity.DbContext.SaveChanges() 
    at GigHub.Controllers.AttendancesController.Attend(Int32 gigId) in D:\Visual studio 2017 online projects\GigHub\GigHub\Controllers\AttendancesController.cs:line 39} 

我有以下出勤模型類

using System.ComponentModel.DataAnnotations; 
using System.ComponentModel.DataAnnotations.Schema; 

namespace GigHub.Models 
{ 
    public class Attendance 
    { 
     public Gig Gig { get; set; } 
     public ApplicationUser Attendee { get; set; } 

     [Key] 
     [Column(Order = 1)] 
     public int GigId { get; set; } 

     [Key] 
     [Column(Order = 2)] 
     public string AttendeeId { get; set; } 
    } 
} 

事件綁定到下面的按鈕

腳本按鈕事件處理是繼

@section scripts{ 

    <script> 
     $(document).ready(function() { 
      $(".js-toggle-attendance").click(function(e) { 
       var button = $(e.target); 
       $.post("/api/Attendances/", button.attr("data-gig-id").valueOf()) 
        .done(function() { 
         button.removeClass("btn-default").addClass("btn-info").text("Going"); 
        }) 
        .fail(function() { 
         alert('Something Failed'); 
        }); 
      }); 
     }); 
    </script> 
} 

我交的方法是像如下， ，但我不明白爲什麼gigiId參數具有0值應該是4，而不是

Answer 1

你錯過添加屬性名gigId

<script> 
     $(document).ready(function() { 
      $(".js-toggle-attendance").click(function(e) { 
       var button = $(e.target); 
       $.post("/api/Attendances/", { "gigId": button.attr("data-gig-id") }) 
        .done(function() { 
         button.removeClass("btn-default").addClass("btn-info").text("Going"); 
        }) 
        .fail(function() { 
         alert('Something Failed'); 
        }); 
      }); 
     }); 
    </script> 

Answer 2

你只需要這個來獲得屬性數據，演出的價值-ID。

button.attr("data-gig-id") 

刪除valueOf（）並在ajax post可能工作時添加參數名稱。

$.post("/api/Attendances", { "gigId": button.attr("data-gig-id") }) 
       .done(function() { 
        button.removeClass("btn-default").addClass("btn-info").text("Going"); 
       }) 
       .fail(function() { 
        alert('Something Failed'); 
       }); 

Answer 3

感謝您的幫助。終於找到解決方案我已經使用了DTO對象而不是參數[FromBody] int gigId並解決了它。是的，我已經刪除.valueOf()，但它沒有奏效。

仍然不明白它爲什麼與DTO協同工作，而不是原始類型參數。