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创建多进程

import multiprocessing
from applications.create_app import create_app
from applications.models.app.app import AppData
from common.model.base_model import db
from sqlalchemy.orm.attributes import flag_modifiedapp = create_app()def worker(record_id, new_id):with app.app_context():# 读取数据并加锁# record = db.session.query(AppData).filter_by(id=record_id).with_for_update().first()record = db.session.query(AppData).filter(AppData.id == record_id).first()# 更新数据if not record.data.get("updated_ids"):record.data["updated_ids"] = []record.data["updated_ids"].append(new_id)flag_modified(record, "data")# 提交事务db.session.commit()def test_thread():# 创建多个进程，模拟多个worker同时更新同一条数据processes = []for i in range(1, 9):p = multiprocessing.Process(target=worker, args=(1, i))processes.append(p)p.start()# 等待所有进程完成for p in processes:p.join()# 检查更新结果with app.app_context():record = db.session.query(AppData).filter(AppData.id == 1).first()print(record.data["updated_ids"])if __name__ == "__main__":test_thread()

创建多线程

def test_():test_thread()def test_thread():# 创建两个线程，模拟两个worker同时更新同一条数据thread1 = threading.Thread(target=worker, args=(1, 1))thread2 = threading.Thread(target=worker, args=(1, 2))thread3 = threading.Thread(target=worker, args=(1, 3))thread4 = threading.Thread(target=worker, args=(1, 4))thread5 = threading.Thread(target=worker, args=(1, 5))thread6 = threading.Thread(target=worker, args=(1, 6))thread7 = threading.Thread(target=worker, args=(1, 7))thread8 = threading.Thread(target=worker, args=(1, 8))# 启动线程thread1.start()thread2.start()thread3.start()thread4.start()thread5.start()thread6.start()thread7.start()thread8.start()# 等待线程完成thread1.join()thread2.join()thread3.join()thread4.join()thread5.join()thread6.join()thread7.join()thread8.join()# 检查更新结果record = AppData.query.filter(AppData.id == 1).first()print(record.data["updated_ids"])  # [1, 2]def worker(record_id, new_id):with db.app.app_context():# 读取数据并加锁# record = db.session.query(AppData).filter_by(id=record_id).first()record = db.session.query(AppData).filter_by(id=record_id).with_for_update().first()# 更新数据if not record.data.get("updated_ids"):record.data["updated_ids"] = []record.data["updated_ids"].append(new_id)flag_modified(record, "data")# 提交事务db.session.commit()