用python访问mongodb的一个问题

Question

我想用python创建一个对象来接收mongodb中的一个文档，文档格式类似如下：
{ "_id" : ObjectId("59f2d36fb934f31fdc002485"), "Name" : "???1711", "Date" : "20
14/12/12", "data" : [ { "time" : "0901", "Open" : "13280.00", "Max" : "13280.00"
, "Min" : "13280.00", "Close" : "13280.00", "Volume" : "0", "Amount" : "580", "S
ettlement" : "0.00", "EXPMA1" : "13304.91", "EXPMA2" : "13301.51" }, { "time" :
"0902", "Open" : "13280.00", "Max" : "13280.00", "Min" : "13280.00", "Close" : "
13280.00", "Volume" : "0", "Amount" : "580", "Settlement" : "0.00", "EXPMA1" : "
13301.08", "EXPMA2" : "13300.66" }]}
data中包含的条数大概有300条左右。
---应该怎么实现这个对象？先谢了。

Answer 1

def loadBar(self, dbName, collectionName, days):
    print "zxb ctaEngine CtaEngine loadBar days = ", days
    """从数据库中读取Bar数据，startDate是datetime对象"""
    startDate = self.today - timedelta(days)

    d = {'datetime':{'$gte':startDate}}
    barData = self.mainEngine.dbQuery(dbName, collectionName, d, 'datetime')

    l = []
    for d in barData:
        print "zxb ctaEngine CtaEngine loadBar d = ", d
        bar = VtBarData()
        bar.__dict__ = d
        l.append(bar)
    return l
类似上面代码中的VtBarData对象，其定义如下：
class VtBarData(VtBaseData):
"""K线数据"""

#----------------------------------------------------------------------
def __init__(self):
    """Constructor"""
    super(VtBarData, self).__init__()

    self.vtSymbol = EMPTY_STRING        # vt系统代码
    self.symbol = EMPTY_STRING          # 代码
    self.exchange = EMPTY_STRING        # 交易所

    self.open = EMPTY_FLOAT             # OHLC
    self.high = EMPTY_FLOAT
    self.low = EMPTY_FLOAT
    self.close = EMPTY_FLOAT

    self.date = EMPTY_STRING            # bar开始的时间，日期
    self.time = EMPTY_STRING            # 时间
    self.datetime = None                # python的datetime时间对象

    self.volume = EMPTY_INT             # 成交量
    self.openInterest = EMPTY_INT       # 持仓量