python查询mysql,返回json的实例

import MySQLdbimport jsondef 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])