使用python脚本的mysql查询出错

Question

我已经编写了一条指令，使用2个id从数据库中获取频率，如下所示：

cursor = db.cursor()
cursor.execute("select freq from matrix_brown where a_id in (%s) and b_id in (%s)",b_item_id,b_after_id)
b_freq=cursor.fetchone()

但是我收到了这个错误：

cursor.execute("select freq from matrix_brown where a_id in (%s) and b_id in (%s)",b_before_id,b_item_id)
TypeError: execute() takes at most 3 arguments (4 given)

请帮帮我.. 谢谢.. :)）

Answer 1

如果您希望execute填写字符串，则说错了：

cursor.execute("select freq from matrix_brown where a_id in (?) and b_id in (?)", (b_item_id,b_after_id))

Answer 2

cursor.execute("select freq from matrix_brown where a_id in (%s) and b_id in (%s)",(b_item_id,b_after_id))