python list in sql query as parameter

Question

I have a python list, say l

l = [1,5,8]

I want to write a sql query to get the data for all the elements of the list, say

s         


        

Answer 1

Answers so far have been templating the values into a plain SQL string. That's absolutely fine for integers, but if we wanted to do it for strings we get the escaping issue.

Here's a variant using a parameterised query that would work for both:

placeholder= '?' # For SQLite. See DBAPI paramstyle.
placeholders= ', '.join(placeholder for unused in l)
query= 'SELECT name FROM students WHERE id IN (%s)' % placeholders
cursor.execute(query, l)