利用python实现xml与数据库读取转换的方法

前言

xml课的第三第四个作业都是用java编程来实现xml dom的一些转换, 因为自己没怎么学过java，因此和老师说了下想用python来实现第三第四个作业，下面就直接贴代码了

xml文档

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="1.xslt" rel="external nofollow" ?>
<!DOCTYPE sys_info [
<!ELEMENT sys_info (info+)>
<!ELEMENT info (sysDescr,sysUpTime,sysContact,sysName)>
<!ELEMENT sysDescr (#PCDATA)>
<!ELEMENT sysUpTime (#PCDATA)>
<!ELEMENT sysContact (#PCDATA)>
<!ELEMENT sysName (#PCDATA)>
<!ATTLIST info ip CDATA #REQUIRED>
]>

<sys_info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="1.xsd">
<info ip="192.168.1.1">
 <sysDescr>X86-Windows2000</sysDescr>
 <sysUpTime>9 hours 42 minutes</sysUpTime>
 <sysContact>zhangsan</sysContact>
 <sysName>computerZhang</sysName>

</info>
<info ip="192.168.1.3">
 <sysDescr>router</sysDescr>
 <sysUpTime>24 hours</sysUpTime>
 <sysContact>ruijie</sysContact>
 <sysName>Router2</sysName>
</info>
<info ip="192.168.2.1">
 <sysDescr>router</sysDescr>
 <sysUpTime>89 hours</sysUpTime>
 <sysContact>Cisco</sysContact>
 <sysName>Router3</sysName>
</info>
</sys_info>

解析xml文档用的是python自带的xml库ElementTree, 读取mysql可以安装MySQLdb模块

apt-get install python-MySQLdb

程序运行如下

root@lj /h/s/x/3# python 21.py -h
usage: 21.py [-h] status

positional arguments:
status  0clar,1read,2insert

读取xml保存到数据库

root@lj /h/s/x/3# python 21.py 2
插入语句: insert into info values ('192.168.1.1','X86-Windows2000','9 hours 42 minutes','zhangsan','computerZhang')
插入语句: insert into info values ('192.168.1.3','router','24 hours','ruijie','Router2')
插入语句: insert into info values ('192.168.2.1','router','89 hours','Cisco','Router3')
insert success!!!

读取数据库保存到xml文档

root@lj /h/s/x/3# python 21.py 1
+-------------+-----------------+--------------------+------------+---------------+
| IP地址 | sysDescr.0 | sysUpTime.0  | sysContact | sysName.0 |
+-------------+-----------------+--------------------+------------+---------------+
| 192.168.1.1 | X86-Windows2000 | 9 hours 42 minutes | zhangsan | computerZhang |
| 192.168.1.3 |  router  |  24 hours  | ruijie | Router2 |
| 192.168.2.1 |  router  |  89 hours  | Cisco | Router3 |
+-------------+-----------------+--------------------+------------+---------------+
write into sys.xml...

建立数据库的sql文件:

-- MySQL dump 10.16 Distrib 10.1.21-MariaDB, for debian-linux-gnu (x86_64)
--
-- Host: localhost Database: localhost
-- ------------------------------------------------------
-- Server version 10.1.21-MariaDB-5

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `info`
--

DROP TABLE IF EXISTS `info`;
/*!40101 SET @saved_cs_client  = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `info` (
`ip` char(15) NOT NULL,
`sysDescr` varchar(20) DEFAULT NULL,
`sysUpTime` varchar(40) DEFAULT NULL,
`sysContract` varchar(20) DEFAULT NULL,
`sysName` varchar(20) DEFAULT NULL,
PRIMARY KEY (`ip`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `info`
--

LOCK TABLES `info` WRITE;
/*!40000 ALTER TABLE `info` DISABLE KEYS */;
INSERT INTO `info` VALUES ('192.168.1.1','X86-Windows2000','9 hours 42 minutes','zhangsan','computerZhang'),('192.168.1.3','router','24 hours','ruijie','Router2'),('192.168.2.1','router','89 hours','Cisco','Router3');
/*!40000 ALTER TABLE `info` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2017-03-23 15:36:31

下面是主要代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date : 2017-03-23 14:47:39
# @Author : 江sir (2461805286@qq.com)
# @Link : http://www.blogsir.com.cn
# @Version : $1.1

import sys
import xml.etree.ElementTree as ET
import MySQLdb
import argparse
from prettytable import PrettyTable

'''
一个xml作业，自己用python实现了从xml读取到数据库，和从数据库读取到xml的功能
'''

def buildNewsXmlFile(data):

root = ET.Element('sys_info')#创建sys_info根元素
# print help(ET)
info = ET.SubElement(root, "info",attrib={'ip':'％s'％data[0][0]})#创建四个二级元素
sysDescr = ET.SubElement(info,"sysDescr")
sysUpTime = ET.SubElement(info,"sysUpTime")
sysContact = ET.SubElement(info,"sysContact")
sysName = ET.SubElement(info,"sysName")
sysDescr.text = data[0][1]
sysUpTime.text = data[0][2]
sysContact.text = data[0][3]
sysName.text = data[0][4]

info = ET.SubElement(root, "info",attrib={'ip':'％s'％data[1][0]})
sysDescr = ET.SubElement(info,"sysDescr")
sysUpTime = ET.SubElement(info,"sysUpTime")
sysContact = ET.SubElement(info,"sysContact")
sysName = ET.SubElement(info,"sysName")
sysDescr.text = data[1][1]
sysUpTime.text = data[1][2]
sysContact.text = data[1][3]
sysName.text = data[1][4]

info = ET.SubElement(root, "info",attrib={'ip':'％s'％data[2][0]})
sysDescr = ET.SubElement(info,"sysDescr")
sysUpTime = ET.SubElement(info,"sysUpTime")
sysContact = ET.SubElement(info,"sysContact")
sysName = ET.SubElement(info,"sysName")
sysDescr.text = data[2][1]
sysUpTime.text = data[2][2]
sysContact.text = data[2][3]
sysName.text = data[2][4]

print 'write into sys.xml...'
tree = ET.ElementTree(root)
tree.write("sys.xml")

def xml_parser():
data = {}
data_list = []
tree = ET.parse('21.xml')
root = tree.getroot()# 获取根元素
for info in root.findall('info'): #查找所有info元素
 for child in info: #对每个info元素遍历属性和子节点
  data ['ip']= info.attrib['ip']
  data[child.tag] = child.text

# print data.values()
 data_list.append(data.values())

# print data_list
return data_list

def get_Mysql():
conn = MySQLdb.connect('localhost','root','root','sys_info2',charset='utf8')
cursor = conn.cursor()
cursor.execute('select * from info');
result = cursor.fetchall()
if not result:
 print 'please insert the database first'
 sys.exit()

x = PrettyTable(['IP地址','sysDescr.0','sysUpTime.0','sysContact','sysName.0'])
for i in result:
 x.add_row(i)
print x

# print result
return result

def set_Mysql(data):
conn = MySQLdb.connect('localhost','root','root','sys_info2',charset='utf8')
cursor = conn.cursor()
for i in data:
 # print tuple(i)
 sysName,ip,sysUpTime,sysDescr,sysContact = tuple(i)
 sql = "insert into info values ('％s','％s','％s','％s','％s')"％(ip,sysDescr,sysUpTime,sysContact,sysName)
 print '插入语句:',sql
 try:
  cursor.execute(sql)
 except:
  print 'please clear the database'
  sys.exit()
print 'insert success!!!'
conn.commit()
conn.close()

def clear_Mysql():
conn = MySQLdb.connect('localhost','root','root','sys_info2',charset='utf8')
cursor = conn.cursor()
cursor.execute('delete from info')
conn.commit()
conn.close()

def main():
parser = argparse.ArgumentParser()
parser.add_argument('status',type=int,help="0clar,1read,2insert")
arg = parser.parse_args()
# print arg
status = arg.status
if status == 1:
 data = get_Mysql()
 buildNewsXmlFile(data)
elif status == 2:
 data = xml_parser()
 set_Mysql(data)
elif status == 0:
 clear_Mysql()
else:
 print 'usage ％s [0|1|2]'％sys.argv[0]

if __name__ == '__main__':
main()

第四个作业是web编程，用python的flask框架即可快速实现一个xml文档的显示，文件过多，就不贴了

来源：http://www.blogsir.com.cn/safe/354.html