Python实现将SQLite中的数据直接输出为CVS的方法示例

本文实例讲述了Python实现将SQLite中的数据直接输出为CVS的方法。分享给大家供大家参考，具体如下：

对于SQLite来说，目前查看还是比较麻烦，所以就像把SQLite中的数据直接转成Excel中能查看的数据，这样也好在Excel中做进一步分数据处理或分析，如前面文章中介绍的《使用Python程序抓取新浪在国内的所有IP》。从网上找到了一个将SQLite转成CVS的方法，贴在这里，供需要的朋友使用：

import sqlite3
import csv, codecs, cStringIO
class UnicodeWriter:
  """
  A CSV writer which will write rows to CSV file "f",
  which is encoded in the given encoding.
  """
  def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
    # Redirect output to a queue
    self.queue = cStringIO.StringIO()
    self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
    self.stream = f
    self.encoder = codecs.getincrementalencoder(encoding)()
  def writerow(self, row):
    self.writer.writerow([unicode(s).encode("utf-8") for s in row])
    # Fetch UTF-8 output from the queue ...
    data = self.queue.getvalue()
    data = data.decode("utf-8")
    # ... and reencode it into the target encoding
    data = self.encoder.encode(data)
    # write to the target stream
    self.stream.write(data)
    # empty queue
    self.queue.truncate(0)
  def writerows(self, rows):
    for row in rows:
      self.writerow(row)
conn = sqlite3.connect('ipaddress.sqlite3.db')
c = conn.cursor()
c.execute('select * from ipdata')
writer = UnicodeWriter(open("export_data.csv", "wb"))
writer.writerows(c)

希望本文所述对大家Python程序设计有所帮助。