Python 解析 xml[xml.dom]

需求

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">idqueryvarchar(200)falsequerypvintegerfalsepvavg_moneyintegerfalse

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,osfrom xml.dom import minidom, Nodedef 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_namesys.exit(1)#print table_name, db_nametable_create_sql = "create table " + table_name +"("#read primary cellprimary_key = table.getElementsByTagName("primary_key")[0]primary_key_name = primary_key.getElementsByTagName("name")[0].childNodes[0].nodeValuetable_create_sql += primary_key_name + " INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY,"#print primary_key.toxml()#read ordernary fieldfields = table.getElementsByTagName("field")f_index = 0for field in fields:f_index += 1name = field.getElementsByTagName("name")[0].childNodes[0].nodeValuetype = field.getElementsByTagName("type")[0].childNodes[0].nodeValuetable_create_sql += name + " " + typeif f_index != len(fields):table_create_sql += ","is_index = field.getElementsByTagName("is_index")[0].childNodes[0].nodeValuetable_create_sql += ");"content.update({"table_create_sql" : table_create_sql})#character set latin1 collate latin1_danish_ci;print contentif __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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