How to check that I am in transaction inside backend

Hello,

Having some expirience with catching errors with BLOBs, I realised, that it 
is really hard to understand that you forget to enclose BLOB operations in 
transaction...

I would like to add a check for each BLOB operation which will check whether 
we are in transaction, and if not it will issue a notice.

The question is how correctly check that I am in transaction.

-- 
Sincerely Yours,
Denis Perchine

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