TypeError：execute（）需要2到3个位置参数，但是给出了7个

Question

我有以下代码，它抛出TypeError：execute（）从2到3个位置参数，但给出了7。我不确定它是否正确，但它是：

result_time = cur.execute("SELECT appointment_id FROM appointments WHERE appointment_time =%s", [appointment_time], "AND appointment_date =%s", [appointment_date], "AND doctor_id =%s", [actual_doctor_id.get('doctor_id')])

所以当满足所有要求时，我想要一个特定的appointment_id。

Answer 1

cursor.execute采用了sql和一个params的元组 - 你单独给了params - 因此你“填充”了它并获得

TypeError：execute（）需要2到3个位置参数，但是给出了7个

更改您的代码包含1个sql语句和一个带有params的元组：

result_time = cur.execute(
    "SELECT appointment_id FROM appointments WHERE appointment_time = %s AND appointment_date = %s AND doctor_id = %s", 
    ( appointment_time, appointment_date, actual_doctor_id.get('doctor_id')) )          

它会起作用。

 cursor.execute( slq, ( param1, param2, ... ) )
 #                      this is all a tuple - hence the 2nd allowed param to execute.

见f.e. myslq-documentation或使用http://bobby-tables.com/python作为快速参考。