);

		return 1 === $result;
	}

	/**
	 * Retrieves metadata by meta ID.
	 *
	 * @param int $meta_id Meta ID.
	 * @return object|bool Metadata object or FALSE if not found.
	 */
	public function get_metadata_by_id( $meta_id ) {
		global $wpdb;

		if ( ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) { // phpcs:ignore WordPress.PHP.StrictComparisons.LooseComparison
			return false;
		}

		$db_info = $this->get_db_info();

		$meta_id = absint( $meta_id );
		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$meta = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT {$db_info['meta_id_field']}, meta_key, meta_value, {$db_info['object_id_field']} FROM {$db_info['table']} WHERE {$db_info['meta_id_field']} = %d",
				$meta_id
			)
		);
		// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared

		if ( empty( $meta ) ) {
			return false;
		}

		if ( isset( $meta->meta_value ) ) {
			$meta->meta_value = maybe_unserialize( $meta->meta_value );
		}

		return $meta;
	}

	/**
	 * Retrieves metadata by meta key.
	 *
	 * @param \WC_Abstract_Order $object Object ID.
	 * @param string             $meta_key Meta key.
	 *
	 * @return \stdClass|bool Metadata object or FALSE if not found.
	 */
	public function get_metadata_by_key( &$object, string $meta_key ) {
		global $wpdb;

		$db_info = $this->get_db_info();

		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$meta = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT {$db_info['meta_id_field']}, meta_key, meta_value, {$db_info['object_id_field']} FROM {$db_info['table']} WHERE meta_key = %s AND {$db_info['object_id_field']} = %d",
				$meta_key,
				$object->get_id(),
			)
		);
		// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared

		if ( empty( $meta ) ) {
			return false;
		}

		foreach ( $meta as $row ) {
			if ( isset( $row->meta_value ) ) {
				$row->meta_value = maybe_unserialize( $row->meta_value );
			}
		}

		return $meta;
	}

	/**
	 * Returns distinct meta keys in use.
	 *
	 * @since 8.8.0
	 *
	 * @param int    $limit           Maximum number of meta keys to return. Defaults to 100.
	 * @param string $order           Order to use for the results. Either 'ASC' or 'DESC'. Defaults to 'ASC'.
	 * @param bool   $include_private Whether to include private meta keys in the results. Defaults to FALSE.
	 * @return string[]
	 */
	public function get_meta_keys( $limit = 100, $order = 'ASC', $include_private = false ) {
		global $wpdb;

		$db_info = $this->get_db_info();

		$query = "SELECT DISTINCT meta_key FROM {$db_info['table']} ";

		if ( ! $include_private ) {
			$query .= $wpdb->prepare( 'WHERE meta_key NOT LIKE %s ', $wpdb->esc_like( '_' ) . '%' );
		}

		$order  = in_array( strtoupper( $order ), array( 'ASC', 'DESC' ), true ) ? $order : 'ASC';
		$query .= 'ORDER BY meta_key ' . $order . ' ';

		if ( $limit ) {
			$query .= $wpdb->prepare( 'LIMIT %d ', $limit );
		}

		return $wpdb->get_col( $query ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- $query is prepared.
	}

}