python – sqlite3数据库被锁定

在sqlite3数据库上有两个读写程序

一个是在sqlite3表上写入硬件操作结果的c程序,另一个是从sqlite读取记录并在完成作业后处理它们并删除行的python脚本.

但删除行时python脚本show database被锁定错误..

db name：db.db

数据库表：
表’行动'(
????‘摆脱’INTEGER PRIMARY KEY AUTOINCREMENT,
????‘所有者’INTEGER,
????‘行动’文字,
????‘node’TEXT,
????‘价值’文字

python脚本：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sqlite3
import time
import os.path
import requests
#import urllib.parse

#defines
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
db_path = os.path.join(BASE_DIR+"/dbs/","db.db")
wd_file_path = os.path.join(BASE_DIR,"wd")
pid = os.getpid()
conn = sqlite3.connect(db_path,isolation_level=None,timeout=30000)
print ("Opened database successfully");
while True:
    res = conn.execute("select * from 'actions' where 'owner'='1';")
    #conn.commit()
    data=res.fetchone()
    print(data)
    if (data is None) :
        print('nothing @ '+str(time.time()))
        with open(wd_file_path,'w') as file_:
            file_.write("{'pid'='"+str(pid)+"','time'='"+str(time.time())+"'}")
        time.sleep(0.5)
    else:
        #print(data)
        r = requests.post("http://127.0.0.1/json.php",data={'act': data[2],'val': data[4]})
        #if (r.text == '1'):
        conn.execute("delete from 'actions' where 'rid'="+str(data[0])+";")
        conn.commit()
        #else:
        #   print(r.text)

你可以看到我在我的连接上放了isolation_level = None和timeout = 30000
但我多次得到数据库锁定错误