_listColumns example

public function getFieldNames(string $table)
    {
        // Is there a cached result?         if (isset($this->dataCache['field_names'][$table])) {
            return $this->dataCache['field_names'][$table];
        }

        if (! $this->connID instanceof SQLite3) {
            $this->initialize();
        }

        $sql = $this->_listColumns($table);

        $query                                  = $this->query($sql);
        $this->dataCache['field_names'][$table] = [];

        foreach ($query->getResultArray() as $row) {
            // Do we know from where to get the column's name?             if (! isset($key)) {
                if (isset($row['column_name'])) {
                    $key = 'column_name';
                } elseif (isset($row['COLUMN_NAME'])) {
                    $key = 'COLUMN_NAME';
                }

public function getFieldNames(string $table)
    {
        // Is there a cached result?         if (isset($this->dataCache['field_names'][$table])) {
            return $this->dataCache['field_names'][$table];
        }

        if (empty($this->connID)) {
            $this->initialize();
        }

        if (false === ($sql = $this->_listColumns($table))) {
            if ($this->DBDebug) {
                throw new DatabaseException('This feature is not available for the database you are using.');
            }

            return false;
        }

        $query = $this->query($sql);

        $this->dataCache['field_names'][$table] = [];