Python 解析 xml[xml.dom]

有一个表，里面数据量比较大，每天一更新，其字段可以通过xml配置文件进行配置，即，可能每次建表的字段不一样。上游跑时会根据配置从源文件中提取，到入库这一步需要根据配置进行建表。

解决

写了一个简单的xml，配置需要字段及类型上游读取到对应的数据入库这一步，先把原表删除，根据配置建新表

XML文件

name="top_query" db_name="evaluting_sys">  id  query  varchar(200)  false  query  pv  integer  false  pv  avg_money  integer  false

处理脚本

#!/usr/bin/python  #   -*- coding:utf-8 -*-  #author:   wklken  #desc:   use to read db xml config.  #-----------------------  #2012-02-18   created  #----------------------  import sys,os  from xml.dom import minidom, Node  def read_dbconfig_xml(xml_file_path):  content = {}  root = minidom.parse(xml_file_path)  table = root.getElementsByTagName("table")[0]  #read dbname and table name.  table_name = table.getAttribute("name")  db_name = table.getAttribute("db_name")  if len(table_name) > 0 and len(db_name) > 0:  db_sql = "create database if not exists `" + db_name +"`; use " + db_name + ";"  table_drop_sql = "drop " + table_name + " if exists " + table_name + ";"  content.update({"db_sql" : db_sql})  content.update({"table_sql" : table_drop_sql })  else:  print "Error:attribute is not define well! db_name=" + db_name + " ;table_name=" + table_name  sys.exit(1)  #print table_name, db_name  table_create_sql = "create table " + table_name +"("  #read primary cell  primary_key = table.getElementsByTagName("primary_key")[0]  primary_key_name = primary_key.getElementsByTagName("name")[0].childNodes[0].nodeValue  table_create_sql += primary_key_name + " INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY,"  #print primary_key.toxml()  #read ordernary field  fields = table.getElementsByTagName("field")  f_index = 0  for field in fields:  f_index += 1  name = field.getElementsByTagName("name")[0].childNodes[0].nodeValue  type = field.getElementsByTagName("type")[0].childNodes[0].nodeValue  table_create_sql += name + " " + type  if f_index != len(fields):  table_create_sql += ","  is_index = field.getElementsByTagName("is_index")[0].childNodes[0].nodeValue  table_create_sql += ");"  content.update({"table_create_sql" : table_create_sql})  #character set latin1 collate latin1_danish_ci;  print content  if __name__ == "__main__":  read_dbconfig_xml(sys.argv[1])

涉及方法

root = minidom.parse(xml_file_path) 获取dom对象

root.getElementsByTagName(“table”) 根据tag获取节点列表

table.getAttribute(“name”) 获取属性

primary_key.getElementsByTagName(“name”)[0].childNodes[0].nodeValue 获取子节点的值（id 得到id）

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