如何解决实体框架-如何找出导致参照完整性错误的原因？
| 使用实体框架，我的代码使用LINQ来获取需要从数据库中删除的对象的集合。根据情况的不同，有时此集合可能很大-30或40个对象。 我尝试将这些对象与它们的相关对象分离，以便删除它们，然后针对每个对象调用context.DeleteObject（），最后调用context.SaveChanges（）。 在大多数情况下，这非常有效，尤其是当要删除的对象的集合很小时。但是，当代码很大时，有时会在参照完整性周围引发错误，尤其是：The DELETE statement conflicted with the REFERENCE constraint
\\\"FK_ServiceFeatureSchemaFragmentSchemaFragment_SchemaFragment\\\".
The conflict occurred in database \\\"MyDataBase\\\",table \\\"dbo.ServiceFeatureSchemaFragmentSchemaFragment\\\".\\r\\n
The statement has been terminated.
解决方法
在SQL Server中编写一个存储过程，您可以在其中看到FK / PK关系的影响，而无需额外的EF映射层来使事情变得混乱。本示例使用用户主配置文件表中的基于整数的ezUserID或ASP.NET成员身份GUID开始删除。
您可以在定义关系时简单地使用级联删除...
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
GO
CREATE PROC [dbo].[ezUser_Delete]
@ezUserID int = NULL,@UserName nvarchar(128) = NULL
AS
BEGIN
SET NOCOUNT ON
DECLARE @UserID uniqueidentifier;
--DECLARE @TranName VARCHAR(20); --Generally shouldn\'t use named transactions in stored procedures
--SELECT @TranName = \'MyTransaction\';
SET XACT_ABORT ON
IF @ezUserID IS NULL AND @UserName IS NULL RETURN 0
BEGIN TRY
BEGIN TRANSACTION;
IF ISNULL(@ezUserID,0) > 0
BEGIN
SELECT @UserID = UserID FROM ezUsers WHERE ezUserID = @ezUserID
SELECT @UserName = UserName FROM aspnet_Users WHERE UserID = @UserID
IF (@UserName IS NULL)
BEGIN
ROLLBACK TRANSACTION;
RETURN -1
END
END
ELSE IF (LEN(ISNULL(@UserName,\'\')) > 0)
BEGIN
SELECT @UserID = UserID FROM aspnet_Users WHERE UserName = @UserName
SELECT @ezUserID = ezUserID FROM ezUsers WHERE UserID = @UserID
IF (@ezUserID IS NULL)
BEGIN
ROLLBACK TRANSACTION;
RETURN -1
END
END
ELSE
RETURN -1
SELECT \'DELETE\' AS [Command],U.UserID,U.UserName,RoleName,M.Email,EU.ezUserID,EU.FirstName,EU.LastName,CallSign,Gender,UIR.RoleID
FROM dbo.aspnet_Users U
LEFT OUTER JOIN dbo.aspnet_Membership M ON U.UserID = M.UserID
LEFT OUTER JOIN dbo.ezUsers EU ON U.UserID = EU.UserID
LEFT OUTER JOIN dbo.aspnet_UsersInRoles UIR ON U.UserID = UIR.UserID
LEFT OUTER JOIN dbo.aspnet_Roles R ON UIR.RoleID = R.RoleID
WHERE U.UserID = @UserID
IF @UserID IS NULL
RETURN -1
DELETE FROM dbo.ezUsersDating WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezUsersPhysicalIdentity WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezMessages WHERE AuthorID = @ezUserID
DELETE FROM dbo.ezTheUsual WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezRentals WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezUsersSharedActivities WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezCurrentVehicle WHERE UVID IN (SELECT UVID FROM dbo.ezUsersVehicles WHERE ezUserID = @ezUserID)
DELETE FROM dbo.ezDriverVehicles WHERE ezUserID = @ezUserID -- Delete this Table
DELETE FROM dbo.ezOwnerVehicles WHERE OwnerID = @ezUserID
DELETE FROM dbo.ezUsersVehicles WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezPL8Messages
WHERE PL8ID IN (
SELECT PL8ID FROM dbo.ezPL8s WHERE VehicleID IN (SELECT VehicleID FROM dbo.ezVehicles WHERE CreatedBy = @ezUserID))
DELETE FROM dbo.ezPL8s WHERE VehicleID IN (SELECT VehicleID FROM dbo.ezVehicles WHERE CreatedBy = @ezUserID)
DELETE FROM dbo.ezPL8s_Vehicles WHERE VehicleID IN (SELECT VehicleID FROM dbo.ezVehicles WHERE CreatedBy = @ezUserID)
DELETE FROM dbo.ezVehicles WHERE CreatedBy = @ezUserID
DELETE FROM dbo.ezImages_Users
WHERE ImageID IN (SELECT ImageID FROM dbo.ezImages
WHERE UploadedBy = @ezUserID)
DELETE FROM dbo.ezImages_Users
WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezImages
WHERE UploadedBy = @ezUserID
DELETE FROM dbo.ezPets
WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezAccounts
WHERE CPID IN (SELECT CPID FROM dbo.ezCompany_People WHERE ezUserID = @ezUserID)
DELETE FROM dbo.ezCompany_People
WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezMedicals
WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezVehicles WHERE CreatedBy = @ezUserID
DELETE FROM dbo.ezParentChildren WHERE ParentID = @UserID OR ChildID = @UserID
DELETE FROM dbo.ezEmergencyContacts WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezDriveThrus_Customers WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezRelationshipsP2P WHERE RelFromID = @UserID OR RelToID = @UserID
DELETE FROM [dbo].[ezPL8Meaning] WHERE ezUserID = @ezUserID
DELETE FROM dbo.ezUsers WHERE UserID = @UserID
DELETE FROM dbo.aspnet_PersonalizationPerUser WHERE UserID = @UserID
DELETE FROM dbo.aspnet_Profile WHERE UserID = @UserID
DELETE FROM dbo.aspnet_UsersInRoles WHERE UserID = @UserID
DELETE FROM dbo.aspnet_Membership WHERE UserID = @UserID
DELETE FROM dbo.aspnet_Users WHERE UserID = @UserID
COMMIT TRANSACTION;
END TRY
BEGIN CATCH
SELECT ERROR_NUMBER(),ERROR_MESSAGE();
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION;
RAISERROR(\'Error\',16,1)
RETURN 0
END CATCH
END
GO
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