Design an in-memory database to handle transactions

Support nested transactions

# get(key: str) gets the value associated with key, or raise error if key doesn’t exist # set(key: str, val: obj) sets the value associated with key. Values can be null # unset(key: str) removes the value associated with the key # begin(): start a new transaction block. # abort(): blow away the changes from the transaction block # commit(): persist the changes

Sem observação adicional neste relato público.