pymysql分页

def sqlexec(last_nid, is_next):

    import pymysql

    conn = pymysql.connect(host='192.168.12.29', port=3306, user='root', passwd='123', db='IndexDB', charset='utf8')

    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)

    # 执行存储过程,获取存储过程的结果集，将返回值设置给了  @_存储过程名_序号 =

    if is_next:

        cursor.execute('select * from tb1 where nid>%s limit 10',last_nid)

        result = cursor.fetchall()

    else:

        cursor.execute('select * from tb1 where nid<%s order by nid desc limit 10', last_nid)

        result = cursor.fetchall()

        result = list(reversed(result))

    conn.commit()

    cursor.close()

    conn.close()

    return result

current_last_nid = 0

current__nid = 0

while True:

    p = input('1、上一页; 2、下一页\n')

    if p == '2':

        # 点击下一页

        is_next = True

        ret = sqlexec(current_last_nid, is_next)

    else:

        is_next = False

        ret = sqlexec(current_first_nid, is_next)

    current_first_nid = ret[0]['nid']

    current_last_nid = ret[-1]['nid']

    for i in ret:

        print(i)