Can I do transactions and locks in CouchDB?

Question

I need to do transactions (begin, commit or rollback), locks (select for update). How can I do it in a document model db?

Edit:

The case is this:

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Answer 1

Just use SQlite kind of lightweight solution for transactions, and when the transaction is completed successfully replicate it, and mark it replicated in SQLite

SQLite table

txn_id    , txn_attribute1, txn_attribute2,......,txn_status
dhwdhwu$sg1   x                    y               added/replicated

You can also delete the transactions which are replicated successfully.