我正在制作一个允许我向数据库添加问题的表单。我编写了代码,但是当我尝试它时,我收到此错误(' AttributeError:'模块'对象没有属性' GetTable')
错误在于我的代码't = self.dbu.GetTable()'
@QtCore.pyqtSignature("on_add_btn_clicked()")
def Add_btn(self):
Question = self.Question_lineEdit.text()#Grabs the text from all line edit fields
Answer = self.Answer_lineEdit.text()
IsmultiChoice = self.IsMultiChoice_lineEdit.text()
if not Question:
QtGui.QMessageBox.warning(self, 'Warning', 'Username Missing')
else:
t = self.dbu.GetTable()
print (t)
for col in t:
if Question == col[1]:
QtGui.QMessageBox.warning(self, 'Warning', 'Question Taken. :(')#Checks the database and warns if the database does exist
else:
self.dbu.AddEntryToTable (Question, Answer, isMultiChoice)
QtGui.QMessageBox.information(self, 'Success', 'User Added Successfully!')#If everythings is okay it adds the user
self.close()
这是我的数据库代码:
import mysql.connector
from mysql.connector import errorcode
from datetime import datetime
class DatabaseUtility:
def __init__(self, database, Tablename,):
self.db = database
self.Tablename = Tablename
self.cnx = mysql.connector.connect(user = 'root',
password = '',
host = 'localhost')
self.cursor = self.cnx.cursor()
def ConnectToDatabase(self):
try:
self.cnx.database = self.db
except mysql.connector.Error as err:
if err.errno == errorcode.ER_BAD_DB_ERROR:
self.CreateDatabase()
self.cnx.database = self.db
else:
print(err.msg)
def CreateDatabase(self):
try:
self.RunCommand("CREATE DATABASE %s DEFAULT CHARACTER SET 'utf8';" %self.db)
except mysql.connector.Error as err:
print("Failed creating database: {}".format(err))
def GetTable(self):
self.Tablename()
return self.RunCommand("SELECT * FROM %s;" % self.Tablename)
def GetColumns(self):
return self.RunCommand("SHOW COLUMNS FROM %s;" % self.Tablename)
def RunCommand(self, cmd):
print ("RUNNING COMMAND: " + cmd)
try:
self.cursor.execute(cmd)
except mysql.connector.Error as err:
print ('ERROR MESSAGE: ' + str(err.msg))
print ('WITH ' + cmd)
try:
msg = self.cursor.fetchall()
except:
msg = self.cursor.fetchone()
return msg
def AddEntryToTable(self, Question, Answer,IsMultiChoice):
cmd = " INSERT INTO " + self.Tablename + " (Question, Answer, IsMultiChoice)"
cmd += " VALUES ('%s', '%s', '%s');" % (Question, Answer, IsMultiChoice)
self.RunCommand(cmd)
def __del__(self):#Deconstructer class
self.cnx.commit()
self.cursor.close()
self.cnx.close()
if __name__ == '__main__':
db = 'UsernamePassword_DB'
Tablename = 'questiontable'
dbu = DatabaseUtility(db, Tablename)
我做错了什么,如何纠正?
答案 0 :(得分:1)
我需要看一些额外的代码才能确定(请参阅我的评论)。但是现在我的猜测是它与你如何首次实例化或引用dbu
变量/属性有关。如果您所做的只是从另一个文件导入,那么因为dbu
在该文件的main()
(在您提供的代码段中)中创建,可能就是问题所在。例如, 不正确 :
from whatever import dbu # wrong
from whatever.main import dbu # Also wrong. In fact I don't think this would even work
相反,将DatabaseUtility
直接导入到脚本中,然后实例化dbu
,如:
from whatever import Database Utility
class SomeClass(object):
...
def startDB(self, db, Tablename):
self.dbu = DatabaseUtility(db, Tablename)
我猜这是因为错误信息显示模块没有属性,而不是提及实际的类。这是我期望看到的错误示例:
In [31]: class MyClass(object):
one = 1
....:
In [32]: myc = MyClass()
In [33]: myc.one
Out[33]: 1
In [34]: myc.two
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-34-4bae87671838> in <module>()
----> 1 myc.two
AttributeError: 'MyClass' object has no attribute 'two'
注意它是怎么说 MyClass 是问题,而不是“模块”。
可能无关,您可能希望从self.Tablename()
中删除DatabaseUtility.GetTable()
。您定义类的方式,Table
是DatabaseUtility
类的属性,但是通过包含您尝试调用它的括号,就好像它是< em>方法(如GetTable
是)。