python 执行mysql 出现Commands out of sync; you can't run this command now
请问怎么解决啊
错误提示：
Exception mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") in <bound method DictCursor.__del_ of <MySQLdb.cursors.DictCursor object at 0x7f5ebc265050>> ignored

import json
import re
import traceback
import binascii
import time

from django.db import models
import MySQLdb as mdb
import MySQLdb.cursors

search_conn = mdb.connect('127.0.0.1', '**', '', '', port=9306, charset='utf8', cursorclass=MySQLdb.cursors.DictCursor)
search_conn.ping(True)
re_punctuations = re.compile(

ur"。|，|,|！|…|!|《|》|<|>|\"|'|:|：|？|\?|、|\||“|”|‘|’|；|\\|—|_|=|（|）|·|\(|\)|　|\.|【|】|『|』|@|&|%|\^|\*|\+|\||<|>|~|`|\[|\]")

def get_conn():

return mdb.connect('127.0.0.1', '***', '', '', port=9306, charset='utf8', cursorclass=MySQLdb.cursors.DictCursor)

def escape_string(string):

return re.sub(r"(['`=\(\)|\-!@~\"&/\\\^\$])", r"\\\1", string)

def split_words(string):

string = re_punctuations.sub(u' ', string).replace(u'-', u' ')
words = []
for w in string.split():
    try:
        words.append(w.encode('ascii').decode('ascii'))
    except:
        for c in w:
            words.append(c)
return u'|'.join(words).strip(u'|')

class HashManager(models.Manager):

def search(self, keyword, start=0, count=10, category=None, sort=None):
    search_cursor = search_conn.cursor()
    sql = '''SELECT id FROM rt_main'''
    conds = []
    values = []
    if keyword:
        conds.append('MATCH(%s)')
        values.append(escape_string(keyword))
    if category:
        conds.append('category=%s')
        values.append(binascii.crc32(category)&0xFFFFFFFFL)
    if conds:
        sql += ' WHERE ' + ' AND '.join(conds)
    if sort == 'create_time':
        sql += ' ORDER BY create_time DESC '
    elif sort == 'length':
        sql += ' ORDER BY length DESC '
    sql += '''
        LIMIT %s,%s
        OPTION max_matches=1000, max_query_time=200
    '''
    search_cursor.execute(sql, values + [start, count])
    items = list(search_cursor.fetchall())
    search_cursor.execute('SHOW META')
    meta = {}
    for d in search_cursor.fetchall():
        meta[d['Variable_name']] = d['Value']
    sql = '''SELECT category, COUNT(*) AS num FROM rt_main '''
    if conds:
        sql += ' WHERE ' + ' AND '.join(conds)
    sql += ''' GROUP BY category OPTION max_query_time=200'''
    search_cursor.execute(sql, values)
    cats = list(search_cursor.fetchall())
    
    res = {
        'result': {
            'items': items,
            'meta': meta,
        },
        'cats': {
            'items': cats,
        },
    }
    search_cursor.close()
    return res

def list_with_files(self, ids):
    res = []
    if len(ids[0]) == 40:
        items = Hash.objects.filter(info_hash__in=ids).values()
    else:
        items = Hash.objects.filter(id__in=ids).values()
    res = list(items)
    items = FileList.objects.filter(info_hash__in=[x['info_hash'] for x in res]).values()
    for x in res:
        for y in items:
            if x['info_hash'] == y['info_hash']:
                try:
                    x['files'] = json.loads(y['file_list'])
                except ValueError:
                    pass
    items = Extra.objects.filter(hash_id__in=ids).values()
    for x in res:
        for y in items:
            if x['id'] == y['hash_id']:
                x['extra'] = y
    return res

def list_related(self, hash_id, name, count=10):
    string = split_words(name)
    if not string:
        return []
    search_conn = get_conn()
    search_cursor = search_conn.cursor()
    try:
        sql = '''SELECT id FROM rt_main WHERE MATCH(%s) AND id<>%s LIMIT 0,%s OPTION max_matches=1000, max_query_time=200'''
        search_cursor.execute(sql, (string, hash_id, count))
        ids = [x['id'] for x in search_cursor.fetchall()]
        items = Hash.objects.only('name', 'length', 'create_time', 'id').filter(id__in=ids).values()
    except:
        traceback.print_exc()
        items = []
    search_cursor.close()
    search_conn.close()
    return items