Update existing row in database from pandas df

Question

I have a PostgreSQL db. Pandas has a \'to_sql\' function to write the records of a dataframe into a database. But I haven\'t found any documentation on how to update an exis

Answer 1

One way is to make use of an sqlalchemy "table class" and session.merge(row), session.commit():

Here is an example:

for row in range(0, len(df)):
    row_data = table_class(column_1=df.ix[i]['column_name'],
                           column_2=df.ix[i]['column_name'],
                           ...
                           )
    session.merge(row_data)
    session.commit()