python 基于psycopg3创建SQLAlchemy引擎

yb3bgrhw  于 2023-01-24  发布在  Python
关注(0)|答案(1)|浏览(331)

我需要将以下代码升级为基于psycopg版本3的等效代码:

import psycopg2
from sqlalchemy import create_engine

engine = create_engine('postgresql+psycopg2://', creator=connector)

这个psycopg2的网址工作起来像一个魅力,但是:

import psycopg # v3.1
from sqlalchemy import create_engine

engine = create_engine('postgresql+psycopg://', creator=connector)

(我也试过"psycopg3"这个词,没有成功)
退货:

Traceback (most recent call last):

  File "/tmp/ipykernel_1032556/253047102.py", line 1, in <cell line: 1>
    engine = create_engine('postgresql+psycopg://', creator=connector)

  File "<string>", line 2, in create_engine

  File "/usr/local/lib/python3.10/dist-packages/sqlalchemy/util/deprecations.py", line 309, in warned
    return fn(*args, **kwargs)

  File "/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/create.py", line 534, in create_engine
    entrypoint = u._get_entrypoint()

  File "/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/url.py", line 661, in _get_entrypoint
    cls = registry.load(name)

  File "/usr/local/lib/python3.10/dist-packages/sqlalchemy/util/langhelpers.py", line 343, in load
    raise exc.NoSuchModuleError(

NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgresql.psycopg

那么,如何正确地创建一个基于psycopg(v3.x)的SQLAlchemy引擎呢?
我的sqlalchemy版本是:"1.4.35"(尝试版本1.4.40,但遇到AttributeError: module 'sqlalchemy' has no attribute 'dialects'错误)。
psycopg3文件:https://www.psycopg.org/psycopg3/docs/api/
SQL炼金术文档:https://docs.sqlalchemy.org/en/14/core/engines.html

h79rfbju

h79rfbju1#

SQLAlchemy在1.4.x系列中不支持psycopg 3。+符号后面的部分是sqlalchemy. dialects. postgresql.{engine}中的一个包,其中engine是psycopg 2、asyncpg或其他内容。
其他方言也是如此。
但是在1.4.x系列中没有psycopg和psycopg 3驱动程序。

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