class Insert

class Insert extends QueryInsert {

  /**
   * {@inheritdoc}
   */
  public function __construct(Connection $connection, string $table, array $options = []) {

    // @todo Remove the __construct in Drupal 11.
    // @see https://www.drupal.org/project/drupal/issues/3256524
    parent::__construct($connection, $table, $options);
    unset($this->queryOptions['return']);
  }

  /**
   * {@inheritdoc}
   */
  public function execute() {
    if (!$this
      ->preExecute()) {
      return NULL;
    }

    // If we're selecting from a SelectQuery, finish building the query and
    // pass it back, as any remaining options are irrelevant.
    if (!empty($this->fromQuery)) {

      // The SelectQuery may contain arguments, load and pass them through.
      return $this->connection
        ->query((string) $this, $this->fromQuery
        ->getArguments(), $this->queryOptions);
    }

    // If there are any fields in the query, execute normal INSERT statements.
    if (count($this->insertFields)) {
      $stmt = $this->connection
        ->prepareStatement((string) $this, $this->queryOptions);
      if (count($this->insertValues) === 1) {

        // Inserting a single row does not require a transaction to be atomic,
        // and executes faster without a transaction wrapper.
        $insert_values = $this->insertValues[0];
        try {
          $stmt
            ->execute($insert_values, $this->queryOptions);
        } catch (\Exception $e) {
          $this->connection
            ->exceptionHandler()
            ->handleExecutionException($e, $stmt, $insert_values, $this->queryOptions);
        }
      }
      else {

        // Inserting multiple rows requires a transaction to be atomic, and
        // executes faster as a single transaction.
        try {
          $transaction = $this->connection
            ->startTransaction();
        } catch (\PDOException $e) {

          // $this->connection->exceptionHandler()->handleExecutionException()
          // requires a $statement argument, so we cannot use that.
          throw new DatabaseExceptionWrapper($e
            ->getMessage(), 0, $e);
        }
        foreach ($this->insertValues as $insert_values) {
          try {
            $stmt
              ->execute($insert_values, $this->queryOptions);
          } catch (\Exception $e) {

            // One of the INSERTs failed, rollback the whole batch.
            $transaction
              ->rollBack();
            $this->connection
              ->exceptionHandler()
              ->handleExecutionException($e, $stmt, $insert_values, $this->queryOptions);
          }
        }
      }

      // Re-initialize the values array so that we can re-use this query.
      $this->insertValues = [];
    }
    else {
      $stmt = $this->connection
        ->prepareStatement("INSERT INTO {{$this->table}} DEFAULT VALUES", $this->queryOptions);
      try {
        $stmt
          ->execute(NULL, $this->queryOptions);
      } catch (\Exception $e) {
        $this->connection
          ->exceptionHandler()
          ->handleExecutionException($e, $stmt, [], $this->queryOptions);
      }
    }
    return $this->connection
      ->lastInsertId();
  }

  /**
   * {@inheritdoc}
   */
  public function __toString() {

    // Create a sanitized comment string to prepend to the query.
    $comments = $this->connection
      ->makeComment($this->comments);

    // Produce as many generic placeholders as necessary.
    $placeholders = [];
    if (!empty($this->insertFields)) {
      $placeholders = array_fill(0, count($this->insertFields), '?');
    }
    $insert_fields = array_map(function ($field) {
      return $this->connection
        ->escapeField($field);
    }, $this->insertFields);

    // If we're selecting from a SelectQuery, finish building the query and
    // pass it back, as any remaining options are irrelevant.
    if (!empty($this->fromQuery)) {
      $insert_fields_string = $insert_fields ? ' (' . implode(', ', $insert_fields) . ') ' : ' ';
      return $comments . 'INSERT INTO {' . $this->table . '}' . $insert_fields_string . $this->fromQuery;
    }
    return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES (' . implode(', ', $placeholders) . ')';
  }

}