- #NET NO EXCEPTION THROWN FOR DEADLOCK SQL HOW TO#
- #NET NO EXCEPTION THROWN FOR DEADLOCK SQL UPDATE#
- #NET NO EXCEPTION THROWN FOR DEADLOCK SQL CODE#
Using (var db2 = new M圜ontext(connectionString))ĭb2.ClientAccounts.First().Balance = Var editedClientAccount = db.ClientAccounts.FirstOrDefault() ĮditedClientAccount.OrgBalance = editedClientAccount.Balance ĮditedClientAccount.Balance =
#NET NO EXCEPTION THROWN FOR DEADLOCK SQL CODE#
If the code within the TRY block fails, the control automatically jumps to the CATCH block, letting the transaction roll back, and if the exception is occurred due to deadlock ( ErrorNumber 1205), the transaction waits for 5 milliseconds. Sample code using (var db = new M圜ontext(connectionString)) The TRY / CATCH method is used to handle the exceptions in the transactions. This causes different behavior as I described here for EF6, but it still holds for EF-core. The Microsft SQL Server-specific error code for a deadlock is 1205 so youd need to handle the SqlException and check for that. You can read more on concurrency control in EF-core here, but note that (surprisingly) they incorrectly use IsConcurrencyToken() instead of IsRowVersion. and users will be made aware of any concurrency conflict. db.Entry(existingClient).OriginalValues = clientAccount.Rowversion Now instead of storing the original balance and using it later, you can simply do. Public DateTime DateTimeCreated Īnd the mapping: modelBuilder.Entity().Property(c => c.Rowversion).IsRowVersion()
#NET NO EXCEPTION THROWN FOR DEADLOCK SQL UPDATE#
The following option is for you to consider.I have the following code that I am trying to update ClientAccount using ef core but they Concurrency Check fails: public class ClientAccount
If you have layered architecture, I mean layers of legacy code :) it may be hard to fix the source of the deadlock. Retry entire transaction blockīack to reality. static DataAccessException, nvertHibernateAccessException(net.sf.hibernate. Let it fail, it is better than data inconsistency. Exception thrown when SQL specified is invalid. Don’t retry on transaction deadlock error, let it failĮither fix the source of the deadlock or remove retry logic on transaction deadlock error.
Underspending the root of the problem gives a clear explanation - don’t suppress SQL exceptions within TransactionScope! Respecting this, in my opinion, we have a few options in order to fix the issue. Because of error suppression, TransactionScope becomes out of sync with MS SQL transaction so obviously, its Dispose fails by saying that the transaction has already been finished. The transaction rolls back automatically and implicitly if some types of errors are thrown, like SqlException: Transaction was deadlocked or SqlException: Conversion failed. The reason for such strange behavior I have found on StackOverflow. Brij Bhushan Mishra ProblemĪfter some time exploring StackOverflow I reproduced the issue by the following test. All this would be taken care by the framework, ensuring the data consistency. If any of the operation fails in between, entire transaction would fail and rolled back which undo all the operation that got completed.
It is a class which provides a simple way to make a set of operations as part of a transaction without worrying about the complexity behind the scene. TransactionScope is a simple way to handle transactions in. Meaning, they are somehow connected to each other. In logs, I have found SqlException: Transaction was deadlocked which is close in time to the exception above.
#NET NO EXCEPTION THROWN FOR DEADLOCK SQL HOW TO#
The source code that throws the exception is using TransactionScope but the exception is thrown not always so it is not obvious on how to reproduce. In ODBC API, it's set through the SQLATTRQUERYTIMEOUT attribute in the SQLSetStmtAttr function. NET Framework, the time-out value is set on the CommandTimeout property. End of inner exception stack trace -Īt (InternalTransaction tx)Īt ()Īt ()Īt () If the time-out value on the application side is set to 0 (no time limit), the Database Engine executes the query until it's completed. > : The COMMIT TRANSACTION request has no corresponding BEGIN TRANSACTION.Īt .OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)Īt .ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)Īt .TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)Īt .Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)Īt .TdsExecuteTransactionManagerRequest(Byte buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)Īt .ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)Īt .SinglePhaseCommit(SinglePhaseEnlistment enlistment)
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