from dao import Mysql

def load_order_data_from_mysql():
    """从数据库中读取数据"""
    client = Mysql()
    tablename = "mock_order"
    query_text = "*"
    
    df = client.load_data(tablename, query_text)
    
     # 去除重复值和填补缺失值
    df.drop_duplicates(inplace=True)
    df.fillna(0, inplace=True)
    return df