I want to use the pandas function to_sql to write a dataframe into a MariaDB database. My Python code inside PyCharm looks as follows:
import pandas as pd
import mysql.connector
from sqlalchemy import create_engine
myd = pd.read_csv('/[path]/[filename].csv')
engine = create_engine('mysql+mysqlconnector://[user]:[pw]@127.0.0.1/[dbname]')
myd.to_sql(name='[tablename]', con=engine, if_exists='replace', index=False)
Error on sql SELECT name FROM sqlite_master WHERE type='table' AND name='[tablename]';
Traceback (most recent call last):
File "/usr/lib/python3.4/code.py", line 90, in runcode
exec(code, self.locals)
File "<input>", line 1, in <module>
File "/usr/lib/python3/dist-packages/pandas/core/frame.py", line 1261, in to_sql
self, name, con, flavor=flavor, if_exists=if_exists, **kwargs)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 207, in write_frame
exists = table_exists(name, con, flavor)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 275, in table_exists
return len(tquery(query, con)) > 0
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 90, in tquery
cur = execute(sql, con, cur=cur)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 44, in execute
cur = con.cursor()
AttributeError: 'Engine' object has no attribute 'cursor'
Passing sqlalchemy engines is only supported starting from pandas 0.14.0
To use to_sql
with older pandas version, you need to pass the raw connection (engine.raw_connection()
) and flavor='mysql'
to to_sql
:
myd.to_sql(name='[tablename]', con=engine.raw_connection(), flavor='mysql', if_exists='replace', index=False)
However, I recommend to upgrade your pandas version (passing raw connections is deprecated and will not be supported anymore in newer pandas versions, then only sqlalchemy engines/connections will be supported)