def write_stocktradeadj(self,beginDate,endDate=''):
col_name='stocktrade'
api=StockGetAll(self.token)
db=DatabaseInterface()
#获取上次中断步数
key=col_name+'step'
step=self.get_step(key)
#如果存在中断，就继续抓取；
#如果不存在中断，数据库重抓，清空历史数据
if step==-1:
db.drop_db_docs(self.db_name,col_name)
print col_name+' all clear!'
print 'scraping from'+str(step+1)+' step....'
data=api.get_db_stocktradeadj(step,beginDate=beginDate,endDate=endDate)
db.write_db_withlog(self.db_name,col_name,data)
db.update_db_date(self.db_name,col_name)
