Question

我有一个关于在我的表mysql中插入标记pubDate的问题，实际上我试图将标记（title，link和pubDate）和最后一个标记（PubDate）放入我的表中。

我解释了代码：

第一步读取页面rss并编写一个xml文件
第二步生成一个只有3个标签的csv文件（title，link和pubDate）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这会产生错误，尽管使用这两种情况都可以正确生成文件。
以及将文件csv存储到mysql中的表格的最后一步。

在此步骤中，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

我认为这个问题出现在pubDate上，因为如果我分两部分运行程序：

第一部分：

创建xml和CSV但是将参数更改为pubDate：item.find('pubDate').text生成文件xml和csv成功但代码显示有关pubdate的错误。

第二部分：

从第一步创建的csv文件插入到mysql中。程序运行成功，没有错误。检查我的数据库并加载信息。

但是在这个选项中，我不能在同一个文件中运行这两个程序，因为错误不允许继续，它不允许执行有关插入数据库的部分。

然后错误实际上是关于这段代码：

# 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()

有人确实知道这个错误。

更新我添加了一行：

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，现在就是这样：

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()

当我对程序进行debbug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

我不知道是否忘记添加内容。

Answer 1

评论：...但现在错误是

仅第一个错误相关：IndexError: tuple index out of range
CSV数据必须是错误的，在传递给MySQL之前检查：

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)

评论：错误：并非所有参数都在SQL语句中使用根据{{3}}：
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 必须是元组列表

因此，您不需要for循环来迭代CSV行数据，您必须将整个CSV数据作为元组列表传递。第二次使用csv module而不是pandas。改为：

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所了解。
Unknown column 'nan' in 'field list'

这部分代码错误。您正在迭代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()))

无法判断这是否会导致上述错误，但您应该更改为以下内容并重试以验证错误是否仍然存在：

for row in csv_data.iterrows():
    cursor.executemany(
        "INSERT INTO noticias(title, link, pubDate) VALUES(%s, %s, %s)",
        ((value for value in row[1]))

使用python

1 个答案: