Python实现简单的多任务mysql转xml的方法_Python

本文实例讲述了Python实现简单的多任务 mysql转xml的方法。分享给大家供大家参考，具体如下：

为了需求导出的格式尽量和navicat导出的xml一致。

用的gevent，文件i/o操作会阻塞，所以并不会完全异步。

1. mysql2xml.py：

									# -*- coding: utf-8 -*-

									'''

									Created on 2014/12/27

									@author: Yoki

									'''

									import gevent

									import pymysql

									from pymysql.cursors import DictCursor

									import re

									import codecs

									db_conn = None

									def init_mysql_connect(*args, **kwargs):

									  global db_conn

									  db_conn = pymysql.connect(*args, **kwargs)

									def list_to_xml(result_cur, key_list):

									  '''

									  mysql 结果集转xml，非xml标准导出方式; xml dom 不支持相同名字的node

									  :param result_cur:

									  :param key_list:

									  :return:

									  '''

									  content = ''

									  content += '<?xml version="1.0" encoding="UTF-8" ?>\r\n'

									  content += '<RECORDS>\r\n' # root节点

									  for item in result_cur:

									    content += '\t<RECORD>\r\n'

									    for k in key_list:

									      v = item.get(k, '')

									      real_value = v

									      content += '\t\t<%s>%s</%s>\r\n' % (k, real_value, k)

									    content += '\t</RECORD>\r\n'

									  content += '</RECORDS>\r\n'

									  return content

									def get_table_rows(tb_name):

									  '''

									  获取mysql表rows

									  :param tb_name:

									  :return:

									  '''

									  global db_conn

									  rows = []

									  cursor = db_conn.cursor(cursor=DictCursor)

									  cursor.execute('select * from %s' % tb_name)

									  for row in cursor:

									    rows.append(row)

									  return rows

									def get_table_keys(tb_name):

									  '''

									  获取表中字段，顺序 为创建表时的顺序

									  :param tb_name:

									  :return:

									  '''

									  global db_conn

									  cursor = db_conn.cursor(cursor=DictCursor)

									  cur = cursor.execute('show create table %s' % tb_name)

									  if cur != 1:

									    raise Exception

									  for r in cursor:

									    create_sql = r['Create Table']

									    fields = re.findall('`(.*?)`', create_sql)

									    result = []

									    # 处理字段

									    for i in xrange(1, len(fields)):

									      field = fields[i]

									      if field in result:

									        continue

									      result.append(field)

									    return result

									  return []

									def mysql_to_xml(tb_name, output_dir='xml', postfix='xml'):

									  '''

									  mysql数据导出xml，

									  :param tb_name: 数据库表名

									  :param output_dir:

									  :param postfix:

									  :return:

									  '''

									  rows = get_table_rows(tb_name)

									  keys = get_table_keys(tb_name)

									  content = list_to_xml(rows, keys)

									  fp = codecs.open('%s/%s.%s' % (output_dir, tb_name, postfix), 'w', 'utf-8')

									  fp.write(content)

									  fp.close()

									tb_list = [

									  'tb_item',

									  'tb_state'

									]

									if __name__ == '__main__':

									  init_mysql_connect(host="localhost", user='user', password="password", database='test', port=3306,

									            charset='utf8')

									  jobs = []

									  for tb_name in tb_list:

									    jobs.append(gevent.spawn(mysql_to_xml, tb_name))

									  gevent.joinall(jobs)

2. list_to_xml函数修改，速度提升上百倍

									def list_to_xml(result_cur, key_list):

									  fp = codecs.open('test.xml'), 'w', 'utf-8')

									  fp.write('<?xml version="1.0" encoding="UTF-8" ?>\r\n')

									  fp.write('<RECORDS>\r\n')

									  for item in result_cur:

									    fp.write('\t<RECORD>\r\n')

									    for k in key_list:

									      v = item.get(k, '')

									      if v is None:

									        real_value = ''

									      else:

									        if type(v) == unicode:

									          real_value = cgi.escape(v)

									        else:

									          real_value = v

									      fp.write('\t\t<%s>%s</%s>\r\n' % (k, real_value, k))

									    fp.write('\t</RECORD>\r\n')

									  fp.write('</RECORDS>\r\n')

									  fp.close()

希望本文所述对大家Python程序设计有所帮助。

Python实现简单的多任务mysql转xml的方法

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