framework/db/cubrid/Schema.php
public function setTransactionIsolationLevel($level)
    {
        // translate SQL92 levels to CUBRID levels:
        switch ($level) {
            case Transaction::SERIALIZABLE:
                $level = '6'; // SERIALIZABLE
                break;
            case Transaction::REPEATABLE_READ:
                $level = '5'; // REPEATABLE READ CLASS with REPEATABLE READ INSTANCES
                break;
            case Transaction::READ_COMMITTED:
                $level = '4'; // REPEATABLE READ CLASS with READ COMMITTED INSTANCES
                break;
            case Transaction::READ_UNCOMMITTED:
                $level = '3'; // REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES
                break;
        }
        parent::setTransactionIsolationLevel($level);
    }
public function setTransactionIsolationLevel($level)
    {
        // translate SQL92 levels to CUBRID levels:
        switch ($level) {
            case Transaction::SERIALIZABLE:
                $level = '6'; // SERIALIZABLE
                break;
            case Transaction::REPEATABLE_READ:
                $level = '5'; // REPEATABLE READ CLASS with REPEATABLE READ INSTANCES
                break;
            case Transaction::READ_COMMITTED:
                $level = '4'; // REPEATABLE READ CLASS with READ COMMITTED INSTANCES
                break;
            case Transaction::READ_UNCOMMITTED:
                $level = '3'; // REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES
                break;
        }
        parent::setTransactionIsolationLevel($level);
    }
{@inheritdoc}
@see http://www.cubrid.org/manual/91/en/sql/transaction.html#database-concurrency