如何知道flutter sqflite中是否存在行？

import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';

Future<bool> isRowExists() async {
  // 打开数据库
  final database = await openDatabase(
    join(await getDatabasesPath(), 'example_database.db'),
    onCreate: (db, version) {
      return db.execute(
        'CREATE TABLE IF NOT EXISTS my_table (id INTEGER PRIMARY KEY, name TEXT)',
      );
    },
    version: 1,
  );

  // 查询特定条件的数据
  final result = await database.query(
    'my_table',
    where: 'name = ?',
    whereArgs: ['John'],
    limit: 1,
  );

  // 判断结果集是否为空
  final isExists = result.isNotEmpty;

  // 关闭数据库
  await database.close();

  return isExists;
}