class Statement

class Statement extends \PDOStatement implements StatementInterface {
    
    /**
     * Reference to the database connection object for this statement.
     *
     * The name $dbh is inherited from \PDOStatement.
     *
     * @var \Drupal\Core\Database\Connection
     */
    public $dbh;
    
    /**
     * Is rowCount() execution allowed.
     *
     * @var bool
     */
    public $allowRowCount = FALSE;
    protected function __construct(Connection $dbh) {
        $this->dbh = $dbh;
        $this->setFetchMode(\PDO::FETCH_OBJ);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConnectionTarget() : string {
        return $this->connection
            ->getTarget();
    }
    
    /**
     * {@inheritdoc}
     */
    public function execute($args = [], $options = []) {
        if (isset($options['fetch'])) {
            if (is_string($options['fetch'])) {
                // \PDO::FETCH_PROPS_LATE tells __construct() to run before properties
                // are added to the object.
                $this->setFetchMode(\PDO::FETCH_CLASS | \PDO::FETCH_PROPS_LATE, $options['fetch']);
            }
            else {
                $this->setFetchMode($options['fetch']);
            }
        }
        $logger = $this->dbh
            ->getLogger();
        if (!empty($logger)) {
            $query_start = microtime(TRUE);
        }
        $return = parent::execute($args);
        if (!empty($logger)) {
            $query_end = microtime(TRUE);
            $logger->log($this, $args, $query_end - $query_start, $query_start);
        }
        return $return;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQueryString() {
        return $this->queryString;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchCol($index = 0) {
        return $this->fetchAll(\PDO::FETCH_COLUMN, $index);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchAllAssoc($key, $fetch = NULL) {
        $return = [];
        if (isset($fetch)) {
            if (is_string($fetch)) {
                $this->setFetchMode(\PDO::FETCH_CLASS, $fetch);
            }
            else {
                $this->setFetchMode($fetch);
            }
        }
        foreach ($this as $record) {
            $record_key = is_object($record) ? $record->{$key} : $record[$key];
            $return[$record_key] = $record;
        }
        return $return;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchAllKeyed($key_index = 0, $value_index = 1) {
        $return = [];
        $this->setFetchMode(\PDO::FETCH_NUM);
        foreach ($this as $record) {
            $return[$record[$key_index]] = $record[$value_index];
        }
        return $return;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchField($index = 0) {
        // Call \PDOStatement::fetchColumn to fetch the field.
        return $this->fetchColumn($index);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchAssoc() {
        // Call \PDOStatement::fetch to fetch the row.
        return $this->fetch(\PDO::FETCH_ASSOC);
    }
    
    /**
     * {@inheritdoc}
     */
    public function rowCount() {
        // SELECT query should not use the method.
        if ($this->allowRowCount) {
            return parent::rowCount();
        }
        else {
            throw new RowCountException();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function setFetchMode($mode, $a1 = NULL, $a2 = []) {
        // Call \PDOStatement::setFetchMode to set fetch mode.
        // \PDOStatement is picky about the number of arguments in some cases so we
        // need to be pass the exact number of arguments we where given.
        switch (func_num_args()) {
            case 1:
                return parent::setFetchMode($mode);
            case 2:
                return parent::setFetchMode($mode, $a1);
            case 3:
            default:
                return parent::setFetchMode($mode, $a1, $a2);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function fetchAll($mode = NULL, $column_index = NULL, $constructor_arguments = NULL) {
        // Call \PDOStatement::fetchAll to fetch all rows.
        // \PDOStatement is picky about the number of arguments in some cases so we
        // need to be pass the exact number of arguments we where given.
        switch (func_num_args()) {
            case 0:
                return parent::fetchAll();
            case 1:
                return parent::fetchAll($mode);
            case 2:
                return parent::fetchAll($mode, $column_index);
            case 3:
            default:
                return parent::fetchAll($mode, $column_index, $constructor_arguments);
        }
    }

}