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- 对 Python 3.8 实用
check_db3.py
# encoding: utf-8
# author: qbit
# date: 2022-05-10
# summary: 遍历查看 db3 文件是否正确,统计记录条数
import os
import sys
import time
import pprint
import sqlite3
import traceback
from multiprocessing import Pool, Lock
SubProcNum = 1 # 子过程数量
TableName = 'my_table_name'
Db3Dir = r'F:\tmp'
def Init4ProcOneFile(lock):
r"""子过程初始化函数"""
global gLock
gLock = lock
def ProcOneFile(db3file: str):
r'''文件无损坏时返回 sqlite 文件中的记录条数'''
pid = os.getpid()
if SubProcNum > 2: # 多过程版本
with gLock:
print(f'pid:{pid}, ProcOneFile {db3file} ...')
else: # 单过程版本
print(f'pid:{pid}, ProcOneFile {db3file} ...')
conn = sqlite3.connect(db3file)
cur = conn.cursor()
sql = f'select count(*) from {TableName};'
exMsg = ''
try:
cur.execute(sql)
row = cur.fetchone()
except Exception as ex:
exMsg = traceback.format_exc()
if SubProcNum > 2: # 多过程版本
with gLock:
print(f'Error file: {db3file} \n {exMsg}')
else:
print(f'Error file: {db3file} \n {exMsg}')
cur.close()
conn.close()
if exMsg:
return 'no', 0, db3file
else:
return 'ok', row[0], db3file
if __name__ == '__main__':
db3List = []
for root, dirs, files in os.walk(Db3Dir):
for file in files:
pathfile = os.path.join(root, file)
if not file.endswith('.db3'):
continue
db3List.append(pathfile)
print(f'db3List size: {len(db3List)}')
if not db3List:
sys.exit(0)
startTime = time.time()
lock = Lock()
print(f'子过程数量: {SubProcNum}')
okDb3List = []
noDb3List = []
if SubProcNum > 1: # 多过程版本
# 还未开启多过程,无需加锁
print(f'{db3List=}')
with Pool(SubProcNum, initializer=Init4ProcOneFile, initargs=(lock,)) as p:
results = p.imap_unordered(func=ProcOneFile, iterable=db3List)
recordNum = 0 # 完整文件的数据总条数
fileCnt = 0 # 已解决的文件个数
for status, num, db3file in results:
if status == 'ok':
recordNum += num
okDb3List.append((num, db3file))
else:
noDb3List.append(db3file)
fileCnt += 1
with lock:
print(f'需解决总文件个数: {len(db3List)},'
f'已解决文件个数: {fileCnt},'
f'okDb3List size: {len(okDb3List)}, noDb3List size: {len(noDb3List)}',
f'已破费工夫: {(time.time()-startTime):.2f}s')
print(f'需解决总文件个数: {len(db3List)},'
f'已解决文件个数: {fileCnt},'
f'okDb3List size: {len(okDb3List)}, noDb3List size: {len(noDb3List)}',
f'已破费工夫: {(time.time()-startTime):.2f}s')
print(f"db3List size: {len(db3List)}, okDb3List size: {len(okDb3List)}, noDb3List size: {len(noDb3List)}")
print(f"okDb3 record number: {recordNum}")
print(f"okDb3List: \n {pprint.pformat(okDb3List)}")
print(f"noDb3List: \n {pprint.pformat(noDb3List)}")
else: # 单过程版本
print(f'{db3List=}')
recordNum = 0 # 完整文件的数据总条数
fileCnt = 0 # 已解决的文件个数
for db3file in db3List:
status, num, db3file = ProcOneFile(db3file)
if status == 'ok':
recordNum += num
okDb3List.append((num, db3file))
else:
noDb3List.append(db3file)
fileCnt += 1
with lock:
print(f'需解决总文件个数: {len(db3List)},'
f'已解决文件个数: {fileCnt},'
f'okDb3List size: {len(okDb3List)}, noDb3List size: {len(noDb3List)}',
f'已破费工夫: {(time.time()-startTime):.2f}s')
print(f"db3List size: {len(db3List)}, okDb3List size: {len(okDb3List)}, noDb3List size: {len(noDb3List)}")
print(f"okDb3 record number: {recordNum}")
print(f"okDb3List: \n {pprint.pformat(okDb3List)}")
print(f"noDb3List: \n {pprint.pformat(noDb3List)}")
print(f"Time total: {(time.time()-startTime):.2f}s")
本文出自 qbit snap
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