asp.net core docker SQL Server deadlock error handling

In this video we will discuss how to catch deadlock error using try/catch in SQL Server.

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Modify the stored procedure as shown below to catch the deadlock error. The code is commented and is self-explanatory.

Alter procedure spTransaction1
as
Begin Begin Tran
Begin Try Update TableA Set Name = 'Mark Transaction 1' where Id = 1 Waitfor delay ' 00:00:05' Update TableB Set Name = 'Mary Transaction 1' where Id = 1 -- If both the update statements succeeded.
-- No Deadlock occurred. So commit the transaction.
Commit Transaction
Select 'Transaction Successful'
End Try
Begin Catch
-- Check if the error is deadlock error
If(ERROR_NUMBER() = 1205)
Begin
Select 'Deadlock. Transaction failed. Please retry'
End
-- Rollback the transaction
Rollback
End Catch
End

Alter procedure spTransaction2
as
Begin Begin Tran
Begin Try
Update TableB Set Name = 'Mary Transaction 2' where Id = 1
Waitfor delay ' 00:00:05'
Update TableA Set Name = 'Mark Transaction 2' where Id = 1
Commit Transaction
Select 'Transaction Successful'
End Try
Begin Catch
If(ERROR_NUMBER() = 1205)
Begin
Select 'Deadlock. Transaction failed. Please retry'
End
Rollback
End Catch
End

After modifying the stored procedures, execute both the procedures from 2 different windows simultaneously. Notice that the deadlock error is handled by the catch block.

In our next video, we will discuss how applications using ADO.NET can handle deadlock errors.

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asp.net core docker SQL Server deadlock error handling
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Education	Upload TimePublished on 30 Aug 2015

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