Doctrine\DBAL\Query\QueryBuilder::getSQLForJoins PHP Method

    private function getSQLForJoins($fromAlias, array &$knownAliases)
    {
        $sql = '';
        if (isset($this->sqlParts['join'][$fromAlias])) {
            foreach ($this->sqlParts['join'][$fromAlias] as $join) {
                if (array_key_exists($join['joinAlias'], $knownAliases)) {
                    throw QueryException::nonUniqueAlias($join['joinAlias'], array_keys($knownAliases));
                }
                $sql .= ' ' . strtoupper($join['joinType']) . ' JOIN ' . $join['joinTable'] . ' ' . $join['joinAlias'] . ' ON ' . (string) $join['joinCondition'];
                $knownAliases[$join['joinAlias']] = true;
            }
            foreach ($this->sqlParts['join'][$fromAlias] as $join) {
                $sql .= $this->getSQLForJoins($join['joinAlias'], $knownAliases);
            }
        }
        return $sql;
    }