| http://www.w3.org/ns/prov#value | - ALTERNATIVE API: $transaction = $DB->start_top_level_transaction(); (or start_transaction(true) or whatever) Same as start_transaction but throws error if there is a transaction already underway $DB->add_rollback_handler($callback, $param); $DB->add_commit_handler($callback, $param); Gives error if there is no transaction.
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