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BUG: SQLAlchemy 2.0.0 #51104

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RMagician opened this issue Feb 1, 2023 · 1 comment
Closed
3 tasks done

BUG: SQLAlchemy 2.0.0 #51104

RMagician opened this issue Feb 1, 2023 · 1 comment
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Bug Needs Triage Issue that has not been reviewed by a pandas team member

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@RMagician
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Pandas version checks

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd
from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String, MetaData

engine = create_engine("postgresql+psycopg2://postgres:postgres@localhost:5432/postgres")

meta = MetaData()

students = Table(
   'students', meta, 
   Column('id', Integer, primary_key = True), 
   Column('name', String), 
   Column('lastname', String), 
)

meta.create_all(engine)

query = "SELECT * FROM students"

df = pd.read_sql(sql=query, con=engine)
print(df.head())

Issue Description

This is an SQL Alchemy version issue. Works fine with SQLAlchemy == 1.4.46; Does not work with 2.0.0

Traceback (most recent call last):
  File "C:\Users\DM_wo\Documents\Rich Insight\reports\asana-clockify\slack-notifier\pandas_bug.py", line 7, in <module>
    monthly_profitability_df = pd.read_sql(sql=query, con=engine)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\DM_wo\Documents\Rich Insight\reports\asana-clockify\slack-notifier\venv\Lib\site-packages\pandas\io\sql.py", line 590, in read_sql
    return pandas_sql.read_query(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\DM_wo\Documents\Rich Insight\reports\asana-clockify\slack-notifier\venv\Lib\site-packages\pandas\io\sql.py", line 1560, in read_query
    result = self.execute(*args)
             ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\DM_wo\Documents\Rich Insight\reports\asana-clockify\slack-notifier\venv\Lib\site-packages\pandas\io\sql.py", line 1405, in execute
    return self.connectable.execution_options().execute(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'OptionEngine' object has no attribute 'execute'

Expected Behavior

Expected behaviour is that it would return an empty dataframe, as it does with previous versions of SQLAlchemy.

$ python pandas_bug.py
Empty DataFrame
Columns: [id, name, lastname]
Index: []

Installed Versions

INSTALLED VERSIONS

commit : 8dab54d
python : 3.11.1.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22621
machine : AMD64
processor : AMD64 Family 23 Model 96 Stepping 1, AuthenticAMD
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : English_United Kingdom.1252

pandas : 1.5.2
numpy : 1.24.1
pytz : 2022.7.1
dateutil : 2.8.2
setuptools : 65.5.0
pip : 23.0
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : 3.0.7
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : 2.9.5
jinja2 : None
IPython : None
pandas_datareader: None
bs4 : None
bottleneck : None
brotli : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : 3.1.0
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : None
snappy : None
sqlalchemy : 2.0.0
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
zstandard : None
tzdata : None

@RMagician RMagician added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Feb 1, 2023
@RMagician
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RMagician commented Feb 1, 2023

duplicate of [#51015]

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