def database():
server = config.server
port = config.port
db = config.db
name = config.name
passwd = config.passwd
col = config.col
conn = MongoDBPipeline(server, port, db, name, passwd, col)
dd = list(
conn.getIds({
"symbol": {
"$regex": u"smtusdt"
},
"period": "1day"
}, col))
data = pd.DataFrame(dd)
return data
