Without the OnOff parameter, this function
returns auto-commit status for
connection_id. Non-zero is returned if
auto-commit is on, 0 if it is off, or
FALSE if an error occurs.
If OnOff is
TRUE, auto-commit is enabled,
if it is
FALSE auto-commit is disabled. Returns
TRUE on success,
FALSE on failure.
By default, auto-commit is on for a connection. Disabling auto-commit is equivalent with starting a transaction.