我在表mysql中插入标签pubDate时遇到问题，实际上我是在尝试将通知（标题，链接和pubDate）和最后一个标签（PubDate）放入表中。
我解释一下代码：
第一步，读取页面rss并写入xml文件
第二步生成仅具有3个标记（标题，链接和pubDate）的csv文件
注意：在此代码中，我需要使用：item.findtext('pubDate')，因为如果我使用item.find('pubDate').text，则尽管在两种情况下都可以正确生成文件，但是这会产生错误。
最后一步是将信息csv存储到mysql中的表中。
在这一步中，我收到了下一个错误：
Connected to pydev debugger (build 171.4694.38)
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1591, in <module>
globals = debugger.run(setup['file'], None, None, is_module)
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1018, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull", line 78, in <module>
main()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull", line 72, in main
testdb()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull", line 56, in testdb
(r[1:] for r in csv_data.itertuples()))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 654, in executemany
return self.execute(stmt)
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 551, in execute
self._handle_result(self._connection.cmd_query(stmt))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\connection.py", line 490, in cmd_query
result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\connection.py", line 395, in _handle_result
raise errors.get_exception(packet)
mysql.connector.errors.ProgrammingError: 1054 (42S22): Unknown column 'nan' in 'field list'
Process finished with exit code 1
我认为这个问题在pubDate上，因为如果我将程序分为两个部分运行：
第一部分：
创建xml和CSV，但通过以下方式将参数更改为pubDate：
item.find('pubDate').text成功生成文件xml和csv，但是代码显示有关pubdate的错误。第二部分：
从第一步中创建的csv文件插入mysql。程序成功运行且没有错误。检查我的数据库并加载信息。
但是在此选项中，我无法在同一文件中运行两个程序，因为错误不允许继续执行，并且不允许执行有关插入数据库的部分。
那么错误实际上是关于此代码的：
# Codigo Python que crea un XML CSV e inserta a una BD MYSQL.
# Llamamos los modulos que necesitamos para ejecutar este script
import csv
import MySQLdb
import requests
import xml.etree.ElementTree as ET
import mysql.connector
import pandas as pd
def loadRSS():
# Configuramos la URL del rss de CNN
url = 'http://rss.cnn.com/rss/edition.xml'
# Creamos un objeto con el que vamos a obtener la url de la variable declarada hace un momento
resp = requests.get(url)
# Procedemos a guardar la informacion en un archivo llamado cnn.XML
with open('cnn.xml', 'wb') as f:
f.write(resp.content)
def loadcsv():
tree = ET.parse("cnn.xml")
root = tree.getroot()
d = open('cnn.csv', 'w')
csvwriter = csv.writer(d)
count = 0
head = ['title', 'link', 'pubDate']
csvwriter.writerow(head)
for item in root.findall('./channel/item'):
row = []
title_name = item.find('title').text
row.append(title_name)
link_name = item.find('link').text
row.append(link_name)
pubDate_name = item.findtext('pubDate')
row.append(pubDate_name)
csvwriter.writerow(row)
d.close()
def testdb():
cnx = mysql.connector.connect(user='root', password='password', host='localhost', database='cnn')
cursor = cnx.cursor()
csv_data = pd.read_csv('cnn.csv')
for row in csv_data.iterrows():
cursor.executemany(
"INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
(r[1:] for r in csv_data.itertuples()))
cnx.commit()
cursor.close()
cnx.close()
#connection = MySQLdb.Connect(host='localhost', user='root', passwd='password', db='cnn')
#cursor = connection.cursor()
#query = "LOAD DATA INFILE 'cnn.csv' INTO TABLE noticias(title, link, pubdate)"
#cursor.execute(query)
#connection.commit()
def main():
# Inicializamos los modulos definidos en el programa.
loadRSS()
loadcsv()
testdb()
if __name__ == "__main__":
# llamamos el metodo main
main()
有人确实对此错误有一个想法。
更新：
我添加一行：
print(csv_data.head())
添加您评论的输出，调试器的结果为：
Connected to pydev debugger (build 171.4694.38)
title \
0 Bloodied and broken: The battle against ISIS i...
1 The human cost of ISIS
2 $1B deal to prop up UK government
3 Netanyahu freezes Western Wall plans
4 Only a 'couple of hundred' ISIS fighters left ...
link \
0 http://cnn.it/2sbE6fp
1 http://www.cnn.com/videos/world/2017/06/25/phi...
2 http://www.cnn.com/2017/06/26/europe/theresa-m...
3 http://www.cnn.com/2017/06/26/middleeast/weste...
4 http://www.cnn.com/2017/06/26/middleeast/coupl...
date
0 NaN
1 Mon, 26 Jun 2017 08:49:00 GMT
2 Mon, 26 Jun 2017 11:59:24 GMT
3 Mon, 26 Jun 2017 13:09:30 GMT
4 Mon, 26 Jun 2017 13:16:21 GMT
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1591, in <module>
globals = debugger.run(setup['file'], None, None, is_module)
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1018, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 80, in <module>
main()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 74, in main
testdb()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 58, in testdb
(r[1:] for r in csv_data.itertuples()))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 654, in executemany
return self.execute(stmt)
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 551, in execute
self._handle_result(self._connection.cmd_query(stmt))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\connection.py", line 490, in cmd_query
result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\connection.py", line 395, in _handle_result
raise errors.get_exception(packet)
mysql.connector.errors.ProgrammingError: 1054 (42S22): Unknown column 'nan' in 'field list'
Process finished with exit code 1
更新27/06/2017：
我添加了testdb的一部分，现在是这样的：
def testdb():
cnx = mysql.connector.connect(user='root', password='password', host='localhost', database='cnn')
cursor = cnx.cursor()
with open('cnn.csv') as fh:
cursor.executemany(
"INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
[tuple(row) for row in csv.reader(fh)]
)
cnx.commit()
cursor.close()
cnx.close()
当我调试程序时，错误是：
Connected to pydev debugger (build 171.4694.38)
Traceback (most recent call last):
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 75, in __call__
return bytes(self.params[index])
IndexError: tuple index out of range
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1591, in <module>
globals = debugger.run(setup['file'], None, None, is_module)
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\pydevd.py", line 1018, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "C:\Program Files\JetBrains\PyCharm Community Edition 2017.1.4\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 79, in <module>
main()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 73, in main
testdb()
File "C:/Users/SoriyAntony/PycharmProjects/cnnwithcvsanddb/cnnfull.py", line 56, in testdb
[tuple(row) for row in csv.reader(fh)]
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 652, in executemany
stmt = self._batch_insert(operation, seq_params)
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 594, in _batch_insert
tmp = RE_PY_PARAM.sub(psub, tmp)
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\lib\site-packages\mysql\connector\cursor.py", line 78, in __call__
"Not enough parameters for the SQL statement")
mysql.connector.errors.ProgrammingError: Not enough parameters for the SQL statement
Process finished with exit code 1
我不知道我是否忘了加点东西。
最佳答案
评论：...但现在的错误是
仅第一个错误是相关的：IndexError: tuple index out of range
CSV数据一定是错误的，请在传递给MySQL之前进行检查：
import csv
records = []
with open('test/cnn.csv') as fh:
for row in csv.reader(fh):
_tuple = tuple(row)
if len(_tuple) == 3:
records.append(_tuple)
else:
print('[FAIL]: Tupel Length not 3, found {} in {}'.format(len(_tuple), _tuple))
cursor.executemany("INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)", records)
注释：错误：SQL语句中未使用所有参数
根据MySQL Connector/Python Developer Guide: 10.5.5 - MySQLCursor.executemany() Method：
data = [
('Jane', date(2005, 2, 12)),
('Joe', date(2006, 5, 23)),
('John', date(2010, 10, 3)),
]
stmt = "INSERT INTO employees (first_name, hire_date) VALUES (%s, %s)"
cursor.executemany(operation, seq_of_params)
seq_of_params必须是一个元组列表
因此，您无需
for循环即可遍历CSV行数据，则必须将整个CSV数据作为元组列表进行传递。其次使用csv module代替pandas。改成：
import csv
with open('cnn.csv') as fh:
cursor.executemany(
"INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
[tuple(row) for row in csv.reader(fh)]
)
使用Python测试：3.4.2
问题：有人确实对此错误有一个想法。
Unknown column 'nan' in 'field list'
您的代码的这一部分是错误的。您要遍历
csv_data两次。for row in csv_data.iterrows():
cursor.executemany(
"INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
(r[1:] for r in csv_data.itertuples()))
无法确定是否导致上述错误，但您应更改为以下内容，然后重试以确认错误是否仍然存在：
for row in csv_data.iterrows():
cursor.executemany(
"INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
((value for value in row[1]))
关于python - 使用python将rss提要标签pubDate导入MySQL数据库时出错，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/44748983/