MySQL Python 两个占位符的问题

Question

我的功能有问题：

def dataf (p,k):
    try:
        connection = mysql.connector.connect(host='host',
                                             database='products',
                                             user='user',
                                             password='pwd')
        sql_select_Query = "select a from table where b LIKE %s AND c LIKE %s"
        cursor = connection.cursor()
        cursor.execute(sql_select_Query, ('%' + p+ '%',), ('%' + k + '%',))
        records = cursor.fetchall()
        return records
    except Error as e:
        print("Error reading data from MySQL table", e)
    finally:
        if (connection.is_connected()):
            connection.close()
            cursor.close()

当我只用第一个占位符执行这个函数时，一切正常。使用第二个占位符，我得到 TypeError: NoneType

对于第二个占位符，我想检查 c 列中的值是否类似于 = 0,5 kg。当我在没有第二个占位符的情况下编写查询并直接插入值时，一切正常：

sql_select_Query = "select a from table where b LIKE %s AND c LIKE '0,5 kg'"

我做错了什么？

Answer 1

好的，我知道了：

sql_select_Query = "select a from table where b LIKE %s AND c LIKE %s"
        cursor = connection.cursor()
        cursor.execute(sql_select_Query, ('%' + p+ '%','%' + k + '%',))

结果出来了

MySQL Python 两个占位符的问题

MySQL Python problem with two Placeholders

python

mysql

mysql-python