一个cgi的例子

#!/usr/bin/python
#coding=utf-8

import psycopg2
import os
import sys

#返回信息中必须有Content-type
print "Content-type: text/html\n\n"

#通过环境变量REQUEST_METHOD获得请求方法
if os.environ["REQUEST_METHOD"] == "GET":
    #cgi get请求通过系统变量 QUERY_STRING 来获取参数
    limit = os.environ["QUERY_STRING"].split("=")[1]
else:
    #cgi post请求从标准输入中获得参数
    limit =  sys.stdin.readline().split("=")[1]

#从数据库中读取数据
conn = psycopg2.connect(database="svmanager", user="svmanager", password="bT9Mkkhu7XBkz7uBa1UNHx", host="192.168.1.56", port="5432")
print "=========================="

cur = conn.cursor()

cur.execute("SELECT vm_name , vm_type from  vms limit %s offset 0;" % limit )
rows = cur.fetchall()

print "<table style=‘border:1px solid black‘>"
for row in rows:
   print "<tr><td>", row[0], "</td><td>" , row[1]  ,"</td></tr>"
print "</table>"

print "========================"
conn.close()