SQL Server : stored procedure transaction

Question

Hello I got some stored procedures to create products and other stuff on my site. Now I have to run some of them in a transaction. Is that possible or do I have to make a st

Answer 1

Begin TRAN
BEGIN TRY
  -- your Action
  Commit TRAN
END TRY
BEGIN CATCH
  IF @@TRANCOUNT > 0
  BEGIN
    ROLLBACK TRAN
  END 
END CATCH

Answer 2

From SQL Server (not sure about other RDBMS), You can call multiple stored procedures inside a transaction.

BEGIN TRAN
EXEC StoredProc1
EXEC StoredProc2
COMMIT TRAN

You may want to add a return code to the stored proc to check if you should run stored proc 2 if stored proc 1 failed

EDIT: To check a return code you can do something like the following. This will run the first stored proc. If it returns 0 then it runs the 2nd. If the 2nd returns 0 then it commits the transaction. If either returns non-0 then it will rollback the transaction

DECLARE @ReturnValue INT
BEGIN TRAN
  EXEC @ReturnValue = StoredProc1
  IF @ReturnValue = 0
  BEGIN
    EXEC @ReturnValue = StoredProc2
    IF @ReturnValue = 0
    BEGIN
      COMMIT
    END
    ELSE
    BEGIN
      ROLLBACK
    END
  END
  ELSE
  BEGIN
    ROLLBACK
  END

Answer 3

To add to the other answers above, you may want to add some error handling:

BEGIN TRAN

BEGIN TRY

   EXEC P1

   EXEC P2

   COMMIT TRAN

END TRY
BEGIN CATCH

  ROLLBACK TRAN

END CATCH

---

Update with C# code (I personally find it a lot easier to keep trans code out of the sprocs and in the data layer - makes composing stored procedures easier at a later stage):

using (var conn = new SqlConnection(...))

    trans = conn.BeginTransaction();

    try
   {
       ...call P1 using transaction
       ...call P2 using transaction

       trans.Commit();
   }
   catch
   {
       trans.RollBack();
       throw;
   }
}

Answer 4

Yes, a stored procedure can be run inside a transaction. Please find below a sample query.

create table temp1
(
    id int,
    name varchar(20)
)

create table temp2
(
    id int,
    name varchar(20)
)
go

create proc p1 as
insert temp1 values (1, 'test1')


create proc p2 as 
insert temp2 values (1, 'test2')
go  

begin tran tx
exec p1
exec p2
commit