Pandas version checks
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[X] I have checked that this issue has not already been reported.
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[X] I have confirmed this bug exists on the latest version of pandas.
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[X] I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import polars as pl
query = "SELECT getdate(), t.* FROM TABLE"
df_sql = pl.read_sql(query, connection_string_db1)
df_sql.schema
df2 = df_sql.to_pandas(use_pyarrow_extension_array=True)
df2.to_sql('table_name', connection_string_db2, if_exists='replace')
Issue Description
This issue persisted from the 2.0.0rc0 version, I made the tests using the same code i've used in the issue https://github.com/pandas-dev/pandas/issues/51859 and made the confirmations about the code atualization looking at the file pandas-2.0.0rc1\pandas\core\arrays\arrow\array.py
.
But even so the error ArrowExtensionArray' object has no attribute 'to_pydatetime
continues to happen.
Full trace error
~\Anaconda3\lib\site-packages\pandas\core\generic.py in to_sql(self, name, con, schema, if_exists, index, index_label, chunksize, dtype, method) 2868 from pandas.io import sql 2869 -> 2870 return sql.to_sql( 2871 self, 2872 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) 765 766 with pandasSQL_builder(con, schema=schema, need_transaction=True) as pandas_sql: --> 767 return pandas_sql.to_sql( 768 frame, 769 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) 1914 ) 1915 -> 1916 total_inserted = sql_engine.insert_records( 1917 table=table, 1918 con=self.con,
~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert_records(self, table, con, frame, name, index, schema, chunksize, method, **engine_kwargs) 1455 1456 try: -> 1457 return table.insert(chunksize=chunksize, method=method) 1458 except exc.StatementError as err: 1459 # GH34431
~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert(self, chunksize, method)
995 raise ValueError(f"Invalid parameter method
: {method}")
996
--> 997 keys, data_list = self.insert_data()
998
999 nrows = len(self.frame)
~\Anaconda3\lib\site-packages\pandas\io\sql.py in insert_data(self) 964 vals = ser._values 965 if vals.dtype.kind == "M": --> 966 d = vals.to_pydatetime() 967 elif vals.dtype.kind == "m": 968 # store as integers, see GH#6921, GH#7076
AttributeError: 'ArrowExtensionArray' object has no attribute 'to_pydatetime'
</details>
### Expected Behavior
I expect to be able to take my data (with date types) from my first database process it using pandas and then write it in my second database.
### Installed Versions
<details>
INSTALLED VERSIONS
------------------
python : 3.9.13.final.0
python-bits : 64
pandas : 2.0.0rc1
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 : 2022.11.0
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 : 1.4.39
tables : 3.6.1
tabulate : 0.8.10
xarray : 0.20.1
xlrd : 2.0.1
zstandard : None
tzdata : None
qtpy : 2.2.0
pyqt5 : None
</details>
**Comment From: romiof**
Hello guys!
I'm following issue https://github.com/pandas-dev/pandas/issues/51859, because it also occurs at my setup.
I had the same problem when trying to use the method `write_database` with _pyarrow engine_ at 2.0.0rc0.
I'm usign PA, because NumPy no-support to _null_ fields is a deal break for my enviorment.
As soon I saw the new version (2.0.0rc1), I gave it a test and the same bug happens again:
**Traceback**
<details>
```python
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
Cell In[15], line 1
----> 1 df_pandas.to_sql(name="MyTableDay17", con=ENGINE_PATH_MSSQL, if_exists="replace")
File ~/.local/lib/python3.10/site-packages/pandas/core/generic.py:2870, in NDFrame.to_sql(self, name, con, schema, if_exists, index, index_label, chunksize, dtype, method)
2705 """
2706 Write records stored in a DataFrame to a SQL database.
2707
(...)
2866 [(1,), (None,), (2,)]
2867 """ # noqa:E501
2868 from pandas.io import sql
-> 2870 return sql.to_sql(
2871 self,
2872 name,
2873 con,
2874 schema=schema,
2875 if_exists=if_exists,
2876 index=index,
2877 index_label=index_label,
2878 chunksize=chunksize,
2879 dtype=dtype,
2880 method=method,
2881 )
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:767, in to_sql(frame, name, con, schema, if_exists, index, index_label, chunksize, dtype, method, engine, **engine_kwargs)
762 raise NotImplementedError(
763 "'frame' argument should be either a Series or a DataFrame"
764 )
766 with pandasSQL_builder(con, schema=schema, need_transaction=True) as pandas_sql:
--> 767 return pandas_sql.to_sql(
768 frame,
769 name,
770 if_exists=if_exists,
771 index=index,
772 index_label=index_label,
773 schema=schema,
774 chunksize=chunksize,
775 dtype=dtype,
776 method=method,
777 engine=engine,
778 **engine_kwargs,
779 )
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:1916, in SQLDatabase.to_sql(self, frame, name, if_exists, index, index_label, schema, chunksize, dtype, method, engine, **engine_kwargs)
1904 sql_engine = get_engine(engine)
1906 table = self.prep_table(
1907 frame=frame,
1908 name=name,
(...)
1913 dtype=dtype,
1914 )
-> 1916 total_inserted = sql_engine.insert_records(
1917 table=table,
1918 con=self.con,
1919 frame=frame,
1920 name=name,
1921 index=index,
1922 schema=schema,
1923 chunksize=chunksize,
1924 method=method,
1925 **engine_kwargs,
1926 )
1928 self.check_case_sensitive(name=name, schema=schema)
1929 return total_inserted
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:1457, in SQLAlchemyEngine.insert_records(self, table, con, frame, name, index, schema, chunksize, method, **engine_kwargs)
1454 from sqlalchemy import exc
1456 try:
-> 1457 return table.insert(chunksize=chunksize, method=method)
1458 except exc.StatementError as err:
1459 # GH34431
1460 # https://stackoverflow.com/a/67358288/6067848
1461 msg = r"""(\(1054, "Unknown column 'inf(e0)?' in 'field list'"\))(?#
1462 )|inf can not be used with MySQL"""
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:997, in SQLTable.insert(self, chunksize, method)
994 else:
995 raise ValueError(f"Invalid parameter `method`: {method}")
--> 997 keys, data_list = self.insert_data()
999 nrows = len(self.frame)
1001 if nrows == 0:
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:966, in SQLTable.insert_data(self)
964 vals = ser._values
965 if vals.dtype.kind == "M":
--> 966 d = vals.to_pydatetime()
967 elif vals.dtype.kind == "m":
968 # store as integers, see GH#6921, GH#7076
969 d = vals.view("i8").astype(object)
AttributeError: 'ArrowExtensionArray' object has no attribute 'to_pydatetime'
I also had a look at all files changed by commit https://github.com/pandas-dev/pandas/pull/51869/ and at my python dir (~/.local/lib/python3.10/site-packages/pandas/
), all the three files had those modifications.
Installed Versions
INSTALLED VERSIONS
------------------
commit : c2a7f1ae753737e589617ebaaff673070036d653
python : 3.10.6.final.0
python-bits : 64
OS : Linux
OS-release : 5.10.16.3-microsoft-standard-WSL2
Version : #1 SMP Fri Apr 2 22:23:49 UTC 2021
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : C.UTF-8
LOCALE : en_US.UTF-8
pandas : 2.0.0rc1
numpy : 1.23.5
pytz : 2022.7.1
dateutil : 2.8.2
setuptools : 59.6.0
pip : 22.0.2
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.2
IPython : 8.11.0
pandas_datareader: None
bs4 : 4.11.2
bottleneck : 1.3.7
brotli : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : None
numba : 0.56.4
numexpr : 2.8.4
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : 11.0.0
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : None
snappy : None
sqlalchemy : 2.0.5.post1
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : None
qtpy : None
pyqt5 : None
Comment From: phofl
Hi, thanks for your report. Can you please provide a reproducible example? ideally without any dependencies
Comment From: romiof
Hi @phofl
I reproduce the bug using a SQLite connection. If need more info, please tell me.
# Create a new Dataframe with NumPy
import pandas as pd
from datetime import datetime
df = pd.DataFrame({"integer": [1, 2, 3],
"date": [
(datetime(2022, 1, 1)),
(datetime(2022, 1, 2)),
(datetime(2022, 1, 3))
],
"float":[4.0, 5.0, 6.0],
"strings": ["first", "second", "third"]
})
# SQLite for tests... in producion i'm using SQL Server
ENGINE_PATH = "sqlite:///mydb.db"
dfarrow = df.convert_dtypes(dtype_backend="pyarrow")
dfarrow.to_sql(name="MyTable_Arrow", con=ENGINE_PATH, if_exists="replace")
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
Cell In[13], line 1
----> 1 dfarrow.to_sql(name="MyTable_Arrow", con=ENGINE_PATH, if_exists="replace")
File ~/.local/lib/python3.10/site-packages/pandas/core/generic.py:2870, in NDFrame.to_sql(self, name, con, schema, if_exists, index, index_label, chunksize, dtype, method)
2705 """
2706 Write records stored in a DataFrame to a SQL database.
2707
(...)
2866 [(1,), (None,), (2,)]
2867 """ # noqa:E501
2868 from pandas.io import sql
-> 2870 return sql.to_sql(
2871 self,
2872 name,
2873 con,
2874 schema=schema,
2875 if_exists=if_exists,
2876 index=index,
2877 index_label=index_label,
2878 chunksize=chunksize,
2879 dtype=dtype,
2880 method=method,
2881 )
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:767, in to_sql(frame, name, con, schema, if_exists, index, index_label, chunksize, dtype, method, engine, **engine_kwargs)
762 raise NotImplementedError(
763 "'frame' argument should be either a Series or a DataFrame"
764 )
766 with pandasSQL_builder(con, schema=schema, need_transaction=True) as pandas_sql:
--> 767 return pandas_sql.to_sql(
768 frame,
769 name,
770 if_exists=if_exists,
771 index=index,
772 index_label=index_label,
773 schema=schema,
774 chunksize=chunksize,
775 dtype=dtype,
776 method=method,
777 engine=engine,
778 **engine_kwargs,
779 )
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:1916, in SQLDatabase.to_sql(self, frame, name, if_exists, index, index_label, schema, chunksize, dtype, method, engine, **engine_kwargs)
1904 sql_engine = get_engine(engine)
1906 table = self.prep_table(
1907 frame=frame,
1908 name=name,
(...)
1913 dtype=dtype,
1914 )
-> 1916 total_inserted = sql_engine.insert_records(
1917 table=table,
1918 con=self.con,
1919 frame=frame,
1920 name=name,
1921 index=index,
1922 schema=schema,
1923 chunksize=chunksize,
1924 method=method,
1925 **engine_kwargs,
1926 )
1928 self.check_case_sensitive(name=name, schema=schema)
1929 return total_inserted
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:1457, in SQLAlchemyEngine.insert_records(self, table, con, frame, name, index, schema, chunksize, method, **engine_kwargs)
1454 from sqlalchemy import exc
1456 try:
-> 1457 return table.insert(chunksize=chunksize, method=method)
1458 except exc.StatementError as err:
1459 # GH34431
1460 # https://stackoverflow.com/a/67358288/6067848
1461 msg = r"""(\(1054, "Unknown column 'inf(e0)?' in 'field list'"\))(?#
1462 )|inf can not be used with MySQL"""
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:997, in SQLTable.insert(self, chunksize, method)
994 else:
995 raise ValueError(f"Invalid parameter `method`: {method}")
--> 997 keys, data_list = self.insert_data()
999 nrows = len(self.frame)
1001 if nrows == 0:
File ~/.local/lib/python3.10/site-packages/pandas/io/sql.py:966, in SQLTable.insert_data(self)
964 vals = ser._values
965 if vals.dtype.kind == "M":
--> 966 d = vals.to_pydatetime()
967 elif vals.dtype.kind == "m":
968 # store as integers, see GH#6921, GH#7076
969 d = vals.view("i8").astype(object)
AttributeError: 'ArrowExtensionArray' object has no attribute 'to_pydatetime'
Comment From: phofl
Thanks! That's great! I reduced it a bit.
Comment From: phofl
@mroeschke Thoughts here? Should we special-case or add to the interface?
Comment From: mroeschke
Ah sorry for preemptively closing; I thought from the original issue .dt.to_pydatetime
was called.
I think we need to special case here. Looks like this method expects numpy arrays.
Comment From: mavestergaard
Has this issue been resolved?