在sqlite3语句中使用Python变量

Question

I would like to use python variable within a sql request.

ss_length = 15

I tried this :

cursor = db.execute("SELECT SUBSTR(timestamp, 1, %s), count(SUBSTR(timestamp, 1, %s)) FROM tweets GROUP BY SUBSTR(timestamp, 1, %s) ORDER BY count(SUBSTR(timestamp, 1, %s))" % ss_length, ss_length, ss_length, ss_length)

and this

cursor = db.execute("SELECT SUBSTR(timestamp, 1, ?), count(SUBSTR(timestamp, 1, ?)) FROM tweets GROUP BY SUBSTR(timestamp, 1, ?) ORDER BY count(SUBSTR(timestamp, 1, ?))", ss_length, ss_length, ss_length, ss_length)

No one of the two worked for me.

What's wrong with them ?

Answer 1

I used this and it worked, thank you all for your responses:

cursor = db.execute("""SELECT SUBSTR(timestamp, 1, ?), count(SUBSTR(timestamp, 1, ?)) 
                       FROM tweets 
                       GROUP BY SUBSTR(timestamp, 1, ?) 
                       ORDER BY count(SUBSTR(timestamp, 1, ?))
                    """, (ss_length, ss_length, ss_length, ss_length))