# -*- coding: utf-8 -*-
"""数据加载器基类"""

class BaseLoader:
    """数据加载器基类"""
    
    def __init__(self, db_ops):
        self.db = db_ops
    
    def upsert(self, records: list) -> tuple:
        """
        执行UPSERT操作
        返回: (inserted_count, updated_count, skipped_count)
        """
        raise NotImplementedError("子类需实现 upsert 方法")
    
    def _batch_size(self) -> int:
        """批次大小"""
        return 1000