SQL IN operator using pyodbc and SQL Server

Question

I\'m using pyodbc to query to an SQL Server database

import datetime
import pyodbc    
conn = pyodbc.connect(\"Driver={SQL Server};Server=\'dbserver\',Datab         


        

Answer 1

To expand on Larry and geographika's answers:

ratings = ('PG-13', 'PG', 'G')
st_dt = datetime(2010, 1, 1)
end_dt = datetime(2010, 12, 31)

placeholders = ', '.join('?' * len(ratings))
vars = (*ratings, st_dt, end_dt)
query = '''
    select title, director, producer
    from movies
    where rating in (%s)
       and release_dt between ? and ?
''' % placeholders

cursor.execute(query, vars)

With the placeholder, this will return a query of:

    select title, director, producer
    from movies
    where rating in (?, ?, ?)
       and release_dt between ? and ?

If you pass in ratings, it'll attempt to fit all of its items into one ?. However, if we pass in *ratings, and each item in ratings will take its place in the in() clause. Thus, we pass the tuple (*ratings, st_dt, end_dt) to cursor.execute().