python - 在Python中读取PostgreSQL数组数据

Question

使用 Python 的 psycopg2 进行查询后

SELECT 
    id,
    array_agg(еnty_pub_uuid) AS ptr_entity_public 
FROM table
GROUP BY id

我返回一个数组:

{a630e0a3-c544-11ea-9b8c-b73c488956ba,c2f03d24-2402-11eb-ab91-3f8e49eb63e7} 

如何将其解析为 python 中的列表？

psycopg2中有内置函数吗？

Answer 1

psycopg2 关心 python 和 postgres 之间的类型对话:

import psycopg2

conn = psycopg2.connect("...")
cur = conn.cursor()
cur.execute(
    "select user_id, array_agg(data_name) from user_circles where user_id = '81' group by user_id"
)
res = cur.fetchall()
print(res[0])
print(type(res[0][1]))

输出:

('81', ['f085b2e3-b943-429e-850f-4ecf358abcbc', '65546d63-be96-4711-a4c1-a09f48fbb7f0', '81d03c53-9d71-4b18-90c9-d33322b0d3c6', '00000000-0000-0000-0000-000000000000'])
<class 'list'>