在sqlite3語句中使用Python變量

Question

我想在sql請求中使用python變量。

ss_length = 15

我嘗試了這個：

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)

和這個

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)

兩者中沒有一個為我工作。

他們怎么了 ？

Answer 1

我用了它，它起作用了，謝謝大家的答復：

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))