如何以正確的方式連接到Python中的MySQL數據庫？

Question

更新; 因此，我對以下兩個偉大的用戶的友好和有益的答復如下

你好，親愛的布萊恩，非常感謝，我刪除了db cpan並再次運行該程序，請參見結果：

martin@linux-70ce:~/perl> python cpan_100.py
Traceback (most recent call last):
  File "cpan_100.py", line 45, in <module>
    user = User.create(name=entry["name"], cname=entry["cname"],
TypeError: string indices must be integers, not str

好吧，這有點困難-為什么我得到這些結果！

這里是原始帖子

對python和編程來說還相當新。

我正在嘗試使用peewee連接到Amazon RDS上的MySQL數據庫，但無法正常工作。 我是數據庫新手，所以我可能正在做一些愚蠢的事情，但這就是我正在嘗試的方法：好吧，我嘗試使用peewee與python建立數據庫連接，但在某些時候程序失敗了。

import urllib
import urlparse
import re
# import peewee
import json
from peewee import *
#from peewee import MySQLDatabase ('cpan', user='root',passwd='rimbaud') 
db = MySQLDatabase('cpan', user='root',passwd='rimbaud') 

class User(Model):
    name = TextField()
    cname = TextField()
    email = TextField()
    url = TextField()

    class Meta:
        database = db # this model uses the cpan database

User.create_table() #ensure table is created

url = "http://search.cpan.org/author/?W"
html = urllib.urlopen(url).read()
for lk, capname, name in re.findall('<a href="(/~.*?/)"><b>(.*?)</b></a><br/><small>(.*?)</small>', html):
    alk = urlparse.urljoin(url, lk)
    data = { 'url':alk, 'name':name, 'cname':capname }
    phtml = urllib.urlopen(alk).read()
    memail = re.search('<a href="mailto:(.*?)">', phtml)
    if memail:
        data['email'] = memail.group(1)

# data = json.load('email') #your json data file here
for entry in data: #assuming your data is an array of JSON objects
    user = User.create(name=entry["name"], cname=entry["cname"],
        email=entry["email"], url=entry["url"])
    user.save()

我得到以下結果

martin@linux-70ce:~/perl> python cpan_100.py
Traceback (most recent call last):
  File "cpan_100.py", line 27, in <module>
    User.create_table() #ensure table is created
  File "build/bdist.linux-i686/egg/peewee.py", line 3078, in create_table                                                                                                           
  File "build/bdist.linux-i686/egg/peewee.py", line 2471, in create_table                                                                                                           
  File "build/bdist.linux-i686/egg/peewee.py", line 2414, in execute_sql                                                                                                            
  File "build/bdist.linux-i686/egg/peewee.py", line 2283, in __exit__                                                                                                               
  File "build/bdist.linux-i686/egg/peewee.py", line 2406, in execute_sql                                                                                                            
  File "/usr/lib/python2.7/site-packages/MySQLdb/cursors.py", line 174, in execute                                                                                                  
    self.errorhandler(self, exc, value)                                                                                                                                             
  File "/usr/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler                                                                                   
    raise errorclass, errorvalue                                                                                                                                                    
peewee.OperationalError: (1050, "Table 'user' already exists")                                                                                                                      
martin@linux-70ce:~/perl>

如果您能幫助我，我將非常高興！ 感謝您提供的所有幫助

問候

Answer 1

看起來它正確連接到您的數據庫，但是失敗，因為該行：

User.create_table() #ensure table is created

嘗試創建表，然后失敗，因為表已經存在，因此出現錯誤消息：

peewee.OperationalError: (1050, "Table 'user' already exists") 

嘗試將其注釋掉：

#User.create_table()