Python 捕获导致SQLite多线程访问错误的对象
在Python和SQLite上运行单元测试时,我看到了一个熟悉的场景:Python 捕获导致SQLite多线程访问错误的对象,python,sqlite,pdb,Python,Sqlite,Pdb,在Python和SQLite上运行单元测试时,我看到了一个熟悉的场景: SQLite objects created in a thread can only be used in that same thread. 测试运行正常,但仍在打印错误。我假设SQLite对象以某种方式泄漏到后台线程 有没有一种简单的方法来代替逐段剖析我的代码 将pdb断点放在某个地方,查看哪个线程中哪个对象导致了冲突(从而立即找出它最初是如何在那里结束的) 打印出带有错误消息的对象(以及引用它们的父对象)
SQLite objects created in a thread can only be used in that same thread.
测试运行正常,但仍在打印错误。我假设SQLite对象以某种方式泄漏到后台线程
有没有一种简单的方法来代替逐段剖析我的代码
- 将
断点放在某个地方,查看哪个线程中哪个对象导致了冲突(从而立即找出它最初是如何在那里结束的)pdb
- 打印出带有错误消息的对象(以及引用它们的父对象)
pysqlite\u check\u thread
函数用法)
pysqlite\u check\u线程
函数引发ProgrammingError
异常并显示该消息
SQLite objects created in a thread can only be used in that same thread.
源代码中的某些函数捕获并打印该异常
为了在源代码中找到在其他线程中调用连接方法的位置,我建议在连接对象上编写调用包装器,如下所示:
# script name: sqllitethread.py
import inspect
import sqlite3
import threading
import thread
from sqlite3 import ProgrammingError
class CallWrapper(object):
def __init__(self, obj):
self.obj = obj
self.main_thread_id = thread.get_ident()
def __getattr__(self, name):
if self.main_thread_id != thread.get_ident():
print "Thread %s requested `%s` attribute from %s" % (thread.get_ident(), name, self.obj)
for frame in inspect.getouterframes(inspect.currentframe())[1:]:
if frame[1].endswith('threading.py'):
continue
print "\t", "%s:%s" % (frame[1], frame[2]), frame[3], frame[4][0].strip()
return getattr(self.obj, name)
conn = CallWrapper(sqlite3.connect('example.db'))
c = conn.cursor()
def worker():
try:
conn.execute('.tables')
except ProgrammingError, e:
print e
t = threading.Thread(target=worker)
t.start()
t.join()
输出示例:
Thread 140390877370112 requested `execute` attribute from <sqlite3.Connection object at 0x7faf4e659858>
sqllitethread.py:30 worker conn.execute('.tables')
SQLite objects created in a thread can only be used in that same thread.The object was created in thread id 140390912665408 and this is thread id 140390877370112
线程140390877370112从
sqllitethread.py:30 worker conn.execute(“.tables”)
在线程中创建的SQLite对象只能在同一线程中使用。该对象是在线程id 140390912665408中创建的,即线程id 140390877370112
非常感谢您的全面回答(很抱歉赏金已经过期)。我会尝试一下,看看结果如何——不是很简单,但没想到会是这样。