Insert same variable into multiple columns in Postgres with python

Question

I want to insert the same decimal value into multiple columns in the same PostgreSQL table using this python script to generate some testing data

 def insert_payout(payout):

     vals = [payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout,
        payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout,
        payout, payout, payout, payout, payout, payout, payout, payout] #works

       sql = '''INSERT INTO test_db.public.test_node
       (col1, col2, col3, col4, col5, col6, col7, col8, col9, col10, col11, col12, col13, col14, col16, col17, col18, col19, col20, col21, col22, col23, col24, col25, col26, col27, col28, col29, col30, col31, col32)
  VALUES
       (val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val, val ) '''

  conn = None
 
     print(vals)#remove after testing
     try:
         # read database configuration
         params = setparams()#managed elsewhere just connects to the db working
         # connect to the PostgreSQL database
         conn = psycopg2.connect(**params)
         # create a new cursor
         cur = conn.cursor()
         # execute the INSERT statement
         cur.execute(sql, vals)
         # commit the changes to the database
         conn.commit()
         # close communication with the database
         cur.close()
      except (Exception, psycopg2.DatabaseError) as error:
          print(error)
      finally:
          if conn is not None:
              conn.close()

    if __name__ == '__main__':
         insert_payout(3.3)

The error I am getting is this:

  [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
   not all arguments converted during string formatting

Casting to a decimal doesn’t work and I reworked it to int and that doesn’t work either.

Asked By: Kyle Sponable

||

Source

Answer 1

Change to this:

def insert_payout(payout):

     vals = [payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout,
        payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout, payout,
        payout, payout, payout, payout, payout, payout, payout, payout] #works

       sql = '''INSERT INTO test_db.public.test_node
       (col1, col2, col3, col4, col5, col6, col7, col8, col9, col10, col11, col12, col13, col14, col16, col17, col18, col19, col20, col21, col22, col23, col24, col25, col26, col27, col28, col29, col30, col31, col32)
  VALUES
       (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s,
%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s) '''

  conn = None
 
     print(vals)#remove after testing
     try:
         # read database configuration
         params = setparams()#managed elsewhere just connects to the db working
         # connect to the PostgreSQL database
         conn = psycopg2.connect(**params)
         # create a new cursor
         cur = conn.cursor()
         # execute the INSERT statement
         cur.execute(sql, vals)
         # commit the changes to the database
         conn.commit()
         # close communication with the database
         cur.close()
      except (Exception, psycopg2.DatabaseError) as error:
          print(error)
      finally:
          if conn is not None:
              conn.close()

    if __name__ == '__main__':
         insert_payout(3.3)

An alternate form, using named arguments, would be:

vals = {"val": payout}
sql = '''INSERT INTO test_db.public.test_node
       (col1, col2, col3, col4, col5, col6, col7, col8, col9, col10, col11, col12, col13, col14, col16, col17, col18, col19, col20, col21, col22, col23, col24, col25, col26, col27, col28, col29, col30, col31, col32)
  VALUES
      (%(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, 
%(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, 
%(val)s,%(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s, %(val)s)'''

Answered By: Adrian Klaver

Insert same variable into multiple columns in Postgres with python

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