Add column to table and then update it inside transaction

Question

I am creating a script that will be run in a MS SQL server. This script will run multiple statements and needs to be transactional, if one of the statement fails the overall

Answer 1

I almost agree with Remus but you can do this with SET XACT_ABORT ON and XACT_STATE

Basically

• SET XACT_ABORT ON will abort each batch on error and ROLLBACK
• Each batch is separated by GO
• Execution jumps to the next batch on error
• Use XACT_STATE() will test if the transaction is still valid

Tools like Red Gate SQL Compare use this technique

Something like:

SET XACT_ABORT ON
GO
BEGIN TRANSACTION
GO

IF COLUMNPROPERTY(OBJECT_ID('Color'), 'CodeID', ColumnId) IS NULL
   ALTER TABLE Color ADD CodeID [uniqueidentifier] NULL
GO

IF XACT_STATE() = 1
  UPDATE Color
  SET CodeID= 'B6D266DC-B305-4153-A7AB-9109962255FC'
  WHERE [Name] = 'Red'
GO

IF XACT_STATE() = 1
 COMMIT TRAN
--else would be rolled back

I've also removed the default. No value = NULL for GUID values. It's meant to be unique: don't try and set every row to all zeros because it will end in tears...