import pymysql
from config import DB_CONFIG

class DatabaseManager:
    def __init__(self):
        self.connection = pymysql.connect(**DB_CONFIG)

    def fetch(self, query, params=None):
        # 实现查询逻辑
        pass

    def insert(self, query, params=None):
        # 实现插入逻辑
        pass

    def update(self, query, params=None):
        # 实现更新逻辑
        pass

    def delete(self, query, params=None):
        # 实现删除逻辑
        pass

    def close(self):
        # 关闭数据库连接
        self.connection.close()

# 可能还包含其他数据库操作方法...