abstract class DataBase {
  static late DataBase _dataBase;

  static DataBase getInstance() {
    return _dataBase;
  }

  static void setInstance(DataBase database) {
    _dataBase = database;
  }

  // 执行查询操作
  Future<List<Map<String, dynamic>>> query(String table, {dynamic condition});

  // 执行插入操作
  Future<void> insert(String table, Map<String, dynamic> data);

  // 执行更新操作
  Future<void> update(
      String table, Map<String, dynamic> data, dynamic condition,
      {bool multiUpdate = false});

  // 执行删除操作
  Future<void> delete(String table, dynamic condition);

  //查询数量
  Future<int> count(String tbale, {dynamic condition});
}

class DataBaseConfig {
  String host;
  String userName;
  String password;
  String dataBase;
  DataBaseConfig(
      {required this.host,
      required this.userName,
      required this.password,
      required this.dataBase});
}