Python 解析 xml[xml.dom]

需求

有一個表，裡面資料量比較大，每天一更新，其欄位可以透過xml設定檔進行配置，即，可能每次建表的欄位不一樣。上游跑時會根據設定從來源檔案擷取，到入庫這一步需要根據設定進行建表。

解決

寫了一個簡單的xml，配置需要字段及類型上游讀取到對應的資料入庫這一步，先把原表刪除，根據配置建新表

XML檔案

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

處理腳本

#!/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) 取得dom物件

#root.getElementsByTagName( “table”) 根據tag取得節點清單

table.getAttribute(“name”) 取得屬性

primary_key.getElementsByTagName(“name”)[0].childNodes[0].nodeValue 取得子節點的值（id 得到id）

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