Question

不幸的是我没有找到问题的答案，所以我在这里试试。我认为这很容易，但我不能做对。既然这是我的第一个问题，我希望我做得对。

我使用Python 3.5和MySql。我使用MySql连接器模块并安装并激活了mysql-server。我想用来自用户输入的变量动态生成查询。这是一个简单的程序，我想让用户编辑表条目。它适用于所有情况，例如： SET title =％s 或WHERE标题=％s 但是，当我想将列名title设为变量时，它会出错（此处（＆＃39;标题＆＃39;）广告（＆＃39;所有者＆＃39;）均来自用户输入）。执行代码块底部的第二个c.execute()块时发送错误：

> mysql.connector.errors.ProgrammingError: 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '('title') = ('owner') WHERE id = ('4')' at line 1

＆＃34;标题＆＃34;是表的列名。所以我希望用户选择他想要更改的列，而不仅仅是值。我只是没有得到第一个变量的格式。请参阅下面的代码片段，希望它更清晰（最后3行是这里的主要焦点：

id_edit = input("Which Application do you want to change? (give Id): ")
id_edit = str(id_edit)

# field_edit is the word "Company" or "Title" for selecting the right column
old_field = input('Which field of Application "%s" do you want to change?: ' % (id_edit))
old_field = old_field.lower()

# new_field: Here the user gives the Input How he wants to name the Field instead
new_field = input('What should be the new value for the id "%s"?: ' % (old_field))    
new_field = new_field.lower()



 if old_field in table_names():
    # this works fine:        
    c.execute("UPDATE applications SET title = (%s) WHERE id = (%s)", (new_field, id_edit)) 
    # this is how I want it to work:
    c.execute("UPDATE applications SET (%s) = (%s) WHERE id = (%s)", (old_field, new_field, id_edit))
conn.commit()

提前谢谢！

用Python查询MySQL所有变量

0 个答案: