Manish Gupta Manish Gupta - 7 months ago 39
Python Question

copy data from csv to postgresql using python

I am on windows 7 64 bit.
I have a csv file 'data.csv'.
I want to import data to a postgresql table 'temp_unicommerce_status' via a python script.

My Script is:

import psycopg2
conn = psycopg2.connect("host='localhost' port='5432' dbname='Ekodev' user='bn_openerp' password='fa05844d'")
cur = conn.cursor()
cur.execute("""truncate table "meta".temp_unicommerce_status;""")
cur.execute("""Copy temp_unicommerce_status from 'C:\Users\n\Desktop\data.csv';""")
conn.commit()
conn.close()


I am getting this error

Traceback (most recent call last):
File "C:\Users\n\Documents\NetBeansProjects\Unicommerce_Status_Update\src\unicommerce_status_update.py", line 5, in <module>
cur.execute("""Copy temp_unicommerce_status from 'C:\\Users\\n\\Desktop\\data.csv';""")
psycopg2.ProgrammingError: must be superuser to COPY to or from a file
HINT: Anyone can COPY to stdout or from stdin. psql's \copy command also works for anyone.

Answer

Use the copy_from cursor method

f = open(r'C:\Users\n\Desktop\data.csv', 'r')
cur.copy_from(f, temp_unicommerce_status, sep=',')
f.close()

The file must be passed as an object.

Since you are coping from a csv file it is necessary to specify the separator as the default is a tab character

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