Remove quotes from string for SQL and insert into Postgres - sql

Question

I want to remove the quotes from each end of string for SQL insert into Postgres.
At the moment my code looks like this:
label='ave_number'
sql_cmd=u"""UPDATE rpt.so_form2_test_noquotes SET %s=%s WHERE channel_id=%s and report_id=%s and load_date=current_date;"""
sql_params=(label, e[u"label"],channel_id,report_id,)
calldb(conn, sql_cmd, sql_params)
def calldb( db, sql_cmd, sql_params): # invoke backend function that is a INSERT/UPDATE statement
try:
cur = db.cursor() # use standard cursor as return is likely void
print 'Executing sql cmd "{0}"'.format(cur.mogrify(sql_cmd, sql_params))
cur.execute(sql_cmd, sql_params)
return # execute returns None expected
except Exception as e:
print u'Error ', e
raise
My Postgres column name is ave_number with no quotes. When the %s get substitued with the string it gives me an error saying there is no column called 'ave_number'.
Thanks in advance

Answer 1

I think you need to use AsIs from psycopg2.extensions
from psycopg2.extensions import AsIs
import psycopg2
def calldb( db, sql_cmd, sql_params): # invoke backend function that is a INSERT/UPDATE statement
try:
cur = db.cursor() # use standard cursor as return is likely void
print 'Executing sql cmd "{0}"'.format(cur.mogrify(sql_cmd, sql_params))
cur.execute(sql_cmd, sql_params)
return # execute returns None expected
except Exception as e:
print u'Error ', e
raise
conn = psycopg2.connect(host='localhost', port=5432, user='xxxxxxx', password='xxxxxx')
label='ave_number'
e={u'label':'test_label'}
channel_id=1
report_id=1
sql_cmd=u"""UPDATE rpt.so_form2_test_noquotes SET %s=%s WHERE channel_id=%s and report_id=%s and load_date=current_date;"""
sql_params=(AsIs(label), e[u"label"],channel_id,report_id,)
calldb(conn, sql_cmd, sql_params)
which outputs this
Executing sql cmd "UPDATE rpt.so_form2_test_noquotes SET ave_number='test_label' WHERE channel_id=1 and report_id=1 and load_date=current_date;"