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我正试图在mySQL数据库中插入scraped items('title')。(Python 3.6)TypeError:无法将字节连接到元组
这是我spider.py文件的片段,刮“标题”内容:
#get more details
def parse_detail_page(self, response):
item = response.meta["item"]
#title
title = response.xpath(".//*[@id='titletextonly']/text()").extract()[0]
item["title"] = title
return item
这是我pipelines.py文件:
import pymysql.cursors
class mySQLTest(object):
def __init__(self):
self.conn = pymysql.connect(host='localhost',
user='root',
password='',
db='testDB',
charset='utf8mb4',
cursorclass=pymysql.cursors.DictCursor)
self.cursor = self.conn.cursor()
def process_item (self, item, spider):
sql = "INSERT INTO items (title) VALUES (%s)", (item['title'])
self.cursor.execute(sql)
self.conn.commit()
return item
我遇到了以下错误:
Traceback (most recent call last):
File "/Users/venv1/lib/python3.6/site-packages/twisted/internet/defer.py", line 653, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/Users/venv1/tutorial/tutorial/pipelines.py", line 31, in process_item
self.cursor.execute(sql)
File "/Users/venv1/lib/python3.6/site-packages/pymysql/cursors.py", line 166, in execute
result = self._query(query)
File "/Users/sandysu/PyCharmProjects/venv1/lib/python3.6/site-packages/pymysql/cursors.py", line 322, in _query
conn.query(q)
File "/Users/venv1/lib/python3.6/site-packages/pymysql/connections.py", line 855, in query
self._execute_command(COMMAND.COM_QUERY, sql)
File "/Users/venv1/lib/python3.6/site-packages/pymysql/connections.py", line 1091, in _execute_command
packet = prelude + sql[:packet_size-1]
TypeError: can't concat bytes to tuple
这是什么类型错误:不能Concat的字节元组是什么意思?它应该如何解决?
如果你使用:'SQL = “INSERT INTO项目(标题)VALUES(” +项目[ '标题'] +“)”'而不是? – nikpod
'sql =“INSERT INTO items(title)VALUES({0})”。format(item ['title'])' – user3450049
@ user3450049 - 你能澄清{0}的用途吗?我尝试了你的建议并得到了这个错误:pymysql.err.ProgrammingError:(1064,“你的SQL语法有错误;检查与你的MariaDB服务器版本相对应的手册, s/s电器 - h/w地板 - 可用:7月1日在1号线) 作为参考,'标题'scraped读取如下:'AAA主要位置 - s/s电器 - h/w地板 - Avail :7月1日'。 – slsu