我正在尝试将时间序列数据从 QuestDb 加载到 Pandas Dataframe。我正在尝试使用 Postgres 驱动程序
import pandas as pd
from sqlalchemy import create_engine
from datetime import datetime
engine = create_engine('postgresql://admin:quest@localhost:8812/mydb')
df = pd.read_sql_query(
"select * from cases where ts between %(dstart)s and %(dfinish)s",
con=engine,
params={"dstart":datetime(2020,12,24,16,0),"dfinish":datetime(2021,1,1,0,0)})
但是回来了
DatabaseError: (psycopg2.DatabaseError) between/and parameters must be constants
LINE 1: ...etry where ts between '2020-12-24T16:00:00'::timestamp ...
我也尝试使用 > 和 < 而不是 BETWEEN
df = pd.read_sql_query(
"select * from cases where ts > %(dstart)s and ts < %(dfinish)s",
con=engine,
params={"dstart":datetime(2014,6,24,16,0),"dfinish":datetime(2014,6,24,17,0)})
但仍然没有运气
DatabaseError: (psycopg2.DatabaseError) unsupported class
LINE 1: ... > '2020-06-24T16:00:00'::timestamp and ts < '2021-01-0...
它在没有参数的情况下工作,所以它不是完全错误的,但我在这里遗漏了一些东西。