python查询mysql,返回json的实例

import MySQLdb
import json
def getSql():  
  try:
    
    con = MySQLdb.connect(host='localhost', user='', passwd='', db='test', charset='utf8')
    cursor = con.cursor()
    sql = "select * from user"
    cursor.execute(sql)
    results = cursor.fetchmany(5)
    
    users = []
    data = {}
    for r in results:
      user = {} 
      user['id'] = r[0]
      user['name'] = r[1]
      user['age'] = r[2]
      user['tel'] = r[3]
      user['address'] = r[4]
      users.append(user)
    
    data['code'] = 0
    data['users'] = users
    jsonStr = json.dumps(data) 
    
    cursor.close()
    con.close()
    return jsonStr
  except MySQLdb.Error, e:
    print "Mysql Error %d: %s" % (e.args[0], e.args[1])