AttributeError: 'str' object has no attribute '_execute_on_connection'

Question

I have a problem with following code:

from pandasql import sqldf
import pandas as pd

df = pd.DataFrame({'column1': [1, 2, 3], 'column2': [4, 5, 6]})

query = "SELECT * FROM df WHERE column1 > 1"

new_dataframe = sqldf(query)

print(new_dataframe)

When I submit, I have this error:

Traceback (most recent call last):

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagessqlalchemyenginebase.py:1410 in execute
    meth = statement._execute_on_connection

AttributeError: 'str' object has no attribute '_execute_on_connection'


The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File ~AppDataLocalProgramsSpyderpkgsspyder_kernelspy3compat.py:356 in compat_exec
    exec(code, globals, locals)

  File c:usersyv663dzdownloadsuntitled1.py:18
    new_dataframe = sqldf(query)

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagespandasqlsqldf.py:156 in sqldf
    return PandaSQL(db_uri)(query, env)

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagespandasqlsqldf.py:61 in __call__
    result = read_sql(query, conn)

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagespandasiosql.py:592 in read_sql
    return pandas_sql.read_query(

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagespandasiosql.py:1557 in read_query
    result = self.execute(*args)

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagespandasiosql.py:1402 in execute
    return self.connectable.execution_options().execute(*args, **kwargs)

  File ~AppDataLocalProgramsSpyderPythonlibsite-packagessqlalchemyenginebase.py:1412 in execute
    raise exc.ObjectNotExecutableError(statement) from err

ObjectNotExecutableError: Not an executable object: 'SELECT * FROM df WHERE column1 > 1'

I installed the latest versions of pandas, pandasql and sqlalchemy and I use Spyder as IDE. Could someone help me please?

Asked By: ciavam

||

Source

Answer 1

SQLAlchemy 2.0 (released 2023-01-26) requires that raw SQL queries be wrapped by sqlalchemy.text.

So you can do

from sqlalchemy import text
...

query = text("SELECT * FROM df WHERE column1 > 1")

Alternatively you can downgrade your SQLAlchemy installation using your Python package manager. For example, if you use pip:

python3 -m pip install --upgrade 'sqlalchemy<2.0'

Answered By: snakecharmerb

Answer 2

I encountered the same problem and after I fixed myquery by wrapping text(query), I got typeerror: expected string or bytes-like object.

Answered By: 张寓弛

AttributeError: 'str' object has no attribute '_execute_on_connection'

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