Mysql 使用字段映射表智能加载数据的Python方式？

我有一个复杂的表格，有几百列，我时不时地从csv文件中获取数据。我所要做的就是用csv文件中的数据更新表

这就是我现在所使用的：我想，没有什么比不使用Python强大的功能更有趣的了？。如果有人能把这句话翻译成Pythonic，那就太棒了

其思想是匹配MyTable和Field_映射中的列名，并相应地进行更新。如果列有一个乘法值，则在插入/更新时它将乘以该值

抱歉，Python代码太乱了，我尽了最大努力让它可读

MyDB.MyTable
------------

PK DateAdded  Firm Addr1     Website
------------------------------------
1  2011-01-01 ABC  1 Main St abc.com

MyDB.Field_Mapping
------------------

SourceColumns TargetTableColumns Multiply
-----------------------------------------
PK          PK           
webaddr       Website
address       Addr1
assets        value              x1000

Python代码：

import string, os, sys

# DB Conn String here

cursor = db.cursor()
cursor2 = db.cursor()
cursor3 = db.cursor()

TableName = sys.argv[1]

cursor.execute("select * from `" + TableName + "` limit 1")

for cursorFieldname in cursor.description:
    cursor2.execute("select TargetTableColumns from MyDB.Field_Mapping where FDIC = \"" + cursorFieldname[0] + "\"")
    row = cursor2.fetchone()

    if row > -1:
       cursor2.execute("alter table `" + TableName + "` change `" + cursorFieldname[0] + "` `" + str(row[0]) + "` varchar(255)")

cursor3.execute("create index PKIndx on `" + filename + "`(PK);")
cursor3.execute("insert ignore into MyDB.MyTable (PK, dateadded) select PK, now() from `" + TableName + "`;")
cursor3.execute("select count(*) from `" + filename + ";")
row2 = cursor3.fetchone()

if str(row2[0]) > "1000": #Deleting PKs > 1000
    cursor3.execute("delete from MyDB.MyTable where PK < \"a\" and PK not in (select PK from `" + filename + "`);")

cursor.execute("select * from `" + filename + "` limit 1")

for cursorFieldname in cursor.description:
    cursor2.execute("select * from MyDB.MyTable limit 1")
    for cursorFieldname2 in cursor2.description:
        if cursorFieldname[0].lower() == cursorFieldname2[0].lower():
         cursor3.execute("select multiply from MyDB.Field_Mapping where TargetTableColumns = \"" + cursorFieldname[0] + "\"")
         row2 = cursor3.fetchone()

         if str(row2[0]) == "x1000":
            cursor3.execute("update MyDB.MyTable as a, `" + filename + "` as b set a.`" + cursorFieldname[0] + "` = b.`" + cursorFieldname[0] + "`*1000 where a.PK = b.PK;")

         elif str(row2[0]) == "%":
            cursor3.execute("update MyDB.MyTable as a, `" + filename + "` as b set a.`" + cursorFieldname[0] + "` = round(b.`" + cursorFieldname[0] + "`, 2) where a.PK = b.PK;")

         else:
            if cursorFieldname[0] == "addr1":
            cursor3.execute("update MyDB.MyTable as a, `" + filename + "` as b set a.`" + cursorFieldname[0] + "` = b.`" + cursorFieldname[0] + "` where a.PK = b.PK and b.`" + cursorFieldname[0] + "` != \"Main Street\";")

        elif cursorFieldname[0] != "PK":
            if cursorFieldname[0].lower() == "website":
                cursor3.execute("update `" + filename + "` set website = lcase(website)")
            cursor3.execute("update MyDB.MyTable as a, `" + filename + "` as b set a.`" + cursorFieldname[0] + "` = b.`" + cursorFieldname[0] + "` where a.PK = b.PK;")

cursor.close()
cursor2.close()
cursor3.close()
db.close()

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我首先将上面的代码表示为一个简单的英语算法。把一个问题分解成你想做的事情的基本部分，而不是你想怎么做，通常会大大简化事情

如果要简化访问，请查看。据我所知，这很好

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就我个人而言，如果你那里的代码有效，那么它不是很多代码，为什么要更改它呢-

听起来像个计划！我认为眼前的问题很简单——匹配列名并更新数据。时间和效率是我想重写它的原因。我认为一些pythonic的方法可以极大地减少代码并提高效率！听说过关于SQLAlchemy的很棒的事情-一定会调查的！非常感谢。