Pandas to_sql fails on duplicate primary key

Question

I\'d like to append to an existing table, using pandas df.to_sql() function.

I set if_exists=\'append\', but my table has primary keys.

Answer 1

Pandas doesn't support editing the actual SQL syntax of the .to_sql method, so you might be out of luck. There's some experimental programmatic workarounds (say, read the Dataframe to a SQLAlchemy object with CALCHIPAN and use SQLAlchemy for the transaction), but you may be better served by writing your DataFrame to a CSV and loading it with an explicit MySQL function.

CALCHIPAN repo: https://bitbucket.org/zzzeek/calchipan/