Skip to content

BUG: 'ArrowExtensionArray' object has no attribute 'to_pydatetime' when the colunm type is datetime in pandas to_sql command #51859

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
3 tasks done
FerriLuli opened this issue Mar 9, 2023 · 0 comments · Fixed by #51869
Labels
Arrow pyarrow functionality Bug

Comments

@FerriLuli
Copy link

FerriLuli commented Mar 9, 2023

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

polars as pl
query = "SELECT getdate(), t.* FROM table "
df_sql = pl.read_sql(query, conn_uri_db1)`
df_sql.schema
df_sql.to_pandas(use_pyarrow_extension_array=True).to_sql('table_name', conn_uri_db2, if_exists='replace')

>Error message: 'ArrowExtensionArray' object has no attribute 'to_pydatetime'```

Issue Description

Hi everyone.
I was trying to take data from one database and write it into another, using Polars, but I was getting this error, analyzing the trace it occurs when polars uses pandas behind the scene to convert their dataframe to pandas dataframe and use the to_sql command, so I reproduced what polars does.
Apparently the error only occurs when using a dataframe that has datetime columns.
Thanks in advance for your help.

Here is the full trace error:

~\AppData\Local\Temp\ipykernel_14916\424779397.py in <module>
----> 1 df_sql.to_pandas(use_pyarrow_extension_array=True).to_sql('teste_2', con, if_exists='replace')

~\Anaconda3\lib\site-packages\pandas\core\generic.py in to_sql(self, name, con, schema, if_exists, index, index_label, chunksize, dtype, method)
   2985         from pandas.io import sql
   2986 
-> 2987         return sql.to_sql(
   2988             self,
   2989             name,

~\Anaconda3\lib\site-packages\pandas\io\sql.py in to_sql(frame, name, con, schema, if_exists, index, index_label, chunksize, dtype, method, engine, **engine_kwargs)
    693         )
    694 
--> 695     return pandas_sql.to_sql(
    696         frame,
    697         name,

~\Anaconda3\lib\site-packages\pandas\io\sql.py in to_sql(self, frame, name, if_exists, index, index_label, schema, chunksize, dtype, method, engine, **engine_kwargs)
   1736         )
   1737 
-> 1738         total_inserted = sql_engine.insert_records(
   1739             table=table,
   1740             con=self.connectable,

~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert_records(self, table, con, frame, name, index, schema, chunksize, method, **engine_kwargs)
   1323 
   1324         try:
-> 1325             return table.insert(chunksize=chunksize, method=method)
   1326         except exc.SQLAlchemyError as err:
   1327             # GH34431

~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert(self, chunksize, method)
    922             raise ValueError(f"Invalid parameter `method`: {method}")
    923 
--> 924         keys, data_list = self.insert_data()
    925 
    926         nrows = len(self.frame)

~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert_data(self)
    890             vals = ser._values
    891             if vals.dtype.kind == "M":
--> 892                 d = vals.to_pydatetime()
    893             elif vals.dtype.kind == "m":
    894                 # store as integers, see GH#6921, GH#7076

AttributeError: 'ArrowExtensionArray' object has no attribute 'to_pydatetime' 

Expected Behavior

I expect to be able to write columns with datetime type into my database.

Installed Versions

INSTALLED VERSIONS

python : 3.9.13.final.0
python-bits : 64
pandas : 1.5.3
numpy : 1.21.5
pytz : 2022.1
dateutil : 2.8.2
setuptools : 63.4.1
pip : 22.2.2
Cython : 0.29.32
pytest : 7.1.2
hypothesis : None
sphinx : 5.0.2
blosc : None
feather : None
xlsxwriter : 3.0.3
lxml.etree : 4.9.1
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 2.11.3
IPython : 7.31.1
pandas_datareader: None
bs4 : 4.11.1
bottleneck : 1.3.5
brotli :
fastparquet : None
fsspec : 2023.3.0
gcsfs : None
matplotlib : 3.5.2
numba : 0.55.1
numexpr : 2.8.3
odfpy : None
openpyxl : 3.0.10
pandas_gbq : None
pyarrow : 11.0.0
pyreadstat : None
pyxlsb : None
s3fs : 2023.3.0
scipy : 1.9.1
snappy :
sqlalchemy : 2.0.5.post1
tables : 3.6.1
tabulate : 0.8.10
xarray : 0.20.1
xlrd : 2.0.1
xlwt : None
zstandard : None
tzdata : None

@FerriLuli FerriLuli added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Mar 9, 2023
@mroeschke mroeschke added Arrow pyarrow functionality and removed Needs Triage Issue that has not been reviewed by a pandas team member labels Mar 9, 2023
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
Arrow pyarrow functionality Bug
Projects
None yet
Development

Successfully merging a pull request may close this issue.

2 participants