Question

I have the follow sql statement in a program I am building, where id_list is sometimes a very large list.

for id in id_list:     self.cursor.execute('''update songs set rating='L' where trackid=?''', (id,)) self.db.commit() 

Is there a more efficient way of doing this that doesn’t involve so many update queries?

Answer 1

SQL:

update songs set rating='L' where trackid IN (id_list) 

Code:

self.cursor.execute('update songs set rating='L' where trackid IN (%s)'%','.join(['?']*len(id_list)), id_list) self.db.commit() 

There is also more elegant, but suboptimal solution:

self.cursor.executemany('update songs set rating='L' where trackid=?', id_list) self.db.commit()