python – sqlite3数据库被锁定

我必须从操作表中删除记录时出现数据库锁定错误.

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

解决方法:

考虑删除无限时True循环并使用connection cursor执行和获取语句：

conn = sqlite3.connect(db_path, isolation_level=None ,timeout=30000) 
print("Opened database successfully")

cur = conn.cursor()
cur.execute("select * from 'actions' where 'owner'='1';") 

for data in cur.fetchall() 
  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'): 
    cur.execute("delete from 'actions' where 'rid'="+str(data[0])+";") 
    conn.commit() 
    #else: 
    # print(r.text)

cur.close()
conn.close()

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