current community

your communities

more stack exchange communities

company blog
Stack Exchange Inbox Reputation and Badges
tour help
Join the Stack Overflow Community
Stack Overflow is a community of 6.3 million programmers, just like you, helping each other.
Join them; it only takes a minute:
Sign up
up vote 1 down vote favorite

I have a database(postgresql) with more than 100 columns and rows. Some cells in the table are empty,I am using python for scripting so None value is placed in empty cells but it shows the following error when I try to insert into table.

"  psycopg2.ProgrammingError: column "none" does not exist"

Am using psycopg2 as python-postgres interface............Any suggestions??

Thanks in advance......

Here is my code:-

list1=[None if str(x)=='nan' else x for x in list1];

cursor.execute("""INSERT INTO table VALUES %s""" %list1;
);
share|improve this question
    
Python does not need to use ; semicolons. – Martijn Pieters♦ Jan 20 '14 at 17:27
    
Does list1 hold just one value? Or are you trying to use this for multiple insertions? – Martijn Pieters♦ Jan 20 '14 at 17:39
up vote 3 down vote

Do not use % string interpolation, use SQL parameters instead. The database adapter can handle None just fine, it just needs translating to NULL, but only when you use SQL parameters will that happen:

list1 = [(None,) if str(x)=='nan' else (x,) for x in list1]

cursor.executemany("""INSERT INTO table VALUES %s""", list1)

I am assuming that you are trying to insert multiple rows here. For that, you should use the cursor.executemany() method and pass in a list of rows to insert; each row is a tuple with one column here.

If list1 is just one value, then use:

param = list1[0]
if str(param) == 'nan':
    param = None

cursor.execute("""INSERT INTO table VALUES %s""", (param,))

which is a little more explicit and readable.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.