crypto_quant/core/db_manager.py

import pandas as pd
from sqlalchemy import create_engine, exc, text
import logging
from core.utils import transform_data_type

def insert_market_data_to_mysql(df: pd.DataFrame, db_url: str):
    """
    将K线行情数据保存到MySQL的crypto_market_data表
    :param df: K线数据DataFrame
    :param symbol: 交易对
    :param bar: K线周期
    :param db_url: 数据库连接URL
    """
    if df is None or df.empty:
        logging.warning("DataFrame为空，无需写入数据库。")
        return

    # 按表字段顺序排列
    columns = [
        'symbol', 'bar', 'timestamp', 'date_time', 'open', 'high', 'low', 'close',
        'volume', 'volCcy', 'volCCyQuote'
    ]
    df = df[columns]

    # 建立数据库连接
    try:
        engine = create_engine(db_url)
        try:
            df.to_sql(
                name='crypto_market_data',
                con=engine,
                if_exists='append',
                index=False,
                method='multi'
            )
            logging.info("数据已成功写入数据库。")
        except Exception as e:
            logging.error(f'插入数据出错: {e}')
            with engine.begin() as conn:
                for _, row in df.iterrows():
                    try:
                        sql = text("""
                            INSERT INTO crypto_market_data
                            (symbol, bar, timestamp, date_time, open, high, low, close, volume, volCcy, volCCyQuote)
                            VALUES (:symbol, :bar, :timestamp, :date_time, :open, :high, :low, :close, :volume, :volCcy, :volCCyQuote)
                            ON DUPLICATE KEY UPDATE
                                open=VALUES(open), high=VALUES(high), low=VALUES(low), close=VALUES(close),
                                volume=VALUES(volume), volCcy=VALUES(volCcy), volCCyQuote=VALUES(volCCyQuote), date_time=VALUES(date_time)
                        """)
                        conn.execute(sql, row.to_dict())
                    except exc.IntegrityError as e:
                        logging.error(f'唯一索引冲突: {e}')
                    except Exception as e:
                        logging.error(f'插入数据出错: {e}')
                logging.info("数据已成功写入数据库。")
    except Exception as e:
        logging.error(f'数据库连接或写入失败: {e}')


def query_latest_data(symbol: str, bar: str, db_url: str):
    """
    查询最新数据
    :param symbol: 交易对
    :param bar: K线周期
    :param db_url: 数据库连接URL
    """
    sql = """
        SELECT * FROM crypto_market_data
        WHERE symbol = :symbol AND bar = :bar
        ORDER BY timestamp DESC
        LIMIT 1
        """
    condition_dict = {"symbol": symbol, "bar": bar}
    return query(sql, condition_dict, db_url, return_multi=False)
    
def query(sql: str, condition_dict: dict, db_url: str, return_multi: bool = True):
    """
    查询数据
    :param sql: 查询SQL
    :param db_url: 数据库连接URL
    """
    try:
        engine = create_engine(db_url)
        with engine.connect() as conn:
            result = conn.execute(text(sql), condition_dict)
            if return_multi:
                result = result.fetchall()
                if result:
                    result_list = [transform_data_type(dict(row._mapping)) for row in result]
                    return result_list
                else:
                    return None
            else:
                result = result.fetchone()
                if result:
                    result_dict = transform_data_type(dict(result._mapping))
                    return result_dict
                else:
                    return None
    except Exception as e:
        logging.error(f'查询数据出错: {e}')
        return None