Python实现将SQLite中的数据直接输出为CVS的方法示例

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)