Flutter:如何在Sqflite中处理多个表？

var database = await openDatabase(
  path.join(await getDatabasesPath(), 'my_database.db'),
  onCreate: (db, version) {
    // 在此处创建表
  },
  version: 1,
);

onCreate: (db, version) {
  db.execute('''
    CREATE TABLE IF NOT EXISTS users (
      id INTEGER PRIMARY KEY,
      name TEXT,
      age INTEGER
    )
  ''');
  db.execute('''
    CREATE TABLE IF NOT EXISTS products (
      id INTEGER PRIMARY KEY,
      name TEXT,
      price REAL
    )
  ''');
},

await database.insert('users', {'name': 'John', 'age': 25});
await database.insert('products', {'name': 'Phone', 'price': 999.99});

var users = await database.query('users');
var products = await database.query('products', where: 'price > ?', whereArgs: [500]);

await database.update('users', {'age': 30}, where: 'name = ?', whereArgs: ['John']);

await database.delete('users', where: 'age < ?', whereArgs: [18]);