如何使用 psycopg2 創建物化視圖？

Question

我在使用 postgres 物化視圖的 timescaledb 創建連續聚合時遇到錯誤：

connection = psycopg2.connect(DATABASE_URI)
cursor = connection.cursor()
cursor.execute(
     """CREATE MATERIALIZED VIEW quotes_1h WITH
    (timescaledb.continuous)
    AS
    SELECT ticker, time_bucket('1h', time) as hour,
    min(close) as low,
    max(close) as high,
    first(close, time) as open,
    last(close, time) as close
    FROM quotes
    GROUP BY
    ticker, time_bucket('1h', time);""")
connection.commit()

錯誤：psycopg2.errors.ActiveSqlTransaction: CREATE MATERIALIZED VIEW... WITH DATA 不能在事務塊內運行

我已經設置了自動提交，但它沒有幫助

Answer 1

修復它：

from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
connection.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)

Answer 2

TimescaleDB 目前不支持在同一事務中創建連續聚合並將其具體化。 因此有兩種選擇：

1. 不要通過將隔離級別設置為ISOLATION_LEVEL_AUTOCOMMIT來創建事務，正如另一個回復中所回答的那樣。
2. 不要通過指定WITH NO DATA並單獨或通過策略刷新來實現連續聚合。

第二種情況將是：

cursor.execute(
     """CREATE MATERIALIZED VIEW quotes_1h WITH
    (timescaledb.continuous)
    AS
    SELECT ticker, time_bucket('1h', time) as hour,
    min(close) as low,
    max(close) as high,
    first(close, time) as open,
    last(close, time) as close
    FROM quotes
    GROUP BY
    ticker, time_bucket('1h', time)
    WITH NO DATA;""")