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悲观锁和乐观锁 乐观锁和悲观锁只是两个加锁的思路，其实现方式多种多样。以下举几个在数据库中的例子。 对于一次的数据修改，我们可以大概将其分为三步。 获取数据 修改数据 提交修改 这里假设A、B两个角色对数据进行修改。 乐观锁 乐观锁对数据保持一个乐观态度（大概率不会有人和我抢）。A角色获取数据、修改 ......

在 React 应用程序中我们遇到以下警告消息： Can’t perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your applica ......

Introduction DevOps的定义有很多种，AWS对其定义如下： “DevOps is the combination of cutural philosophies, practices, and tools that increases an organization's abilit ......

1.先分组查询出来重复的 SELECT substring(mgr_addvcd, 1, 6), gate_name from yg_gate_base_b where mgr_addvcd like '3408%' group by substring(mgr_addvcd, 1, 6), gat ......

Lecture07-Introduction to Geometry几何 目录Lecture07-Introduction to Geometry几何Implicit Surface 隐式的曲面CSG-Constructive Solid Geometry（Implicit）构造刚体几何图形Blen ......

1. Instruction of the course Everything you learn will help you create your own 10-day schedule which is the base of the program. This program is divi ......

一、背景 本文主要测试MySQL执行update语句时，针对与原数据（即未修改）相同的update语句会在MySQL内部重新执行吗？ 二、测试环境 MySQL5.7.25 Centos 7.4 三、binlog_format为ROW 1、参数 2、测试步骤 session1 session2 ses ......

Reading Notes about the book Deep Reinforcement Learning written by Aske Plaat Recently, I have been reading the book Deep Reinforcement Learning writ ......

sudo update-alternatives --list go 现实go有哪些替换版本 sudo update-alternatives --config go 选择特定版本go sudo update-alternatives --install /usr/bin/go go /usr/lo ......

os: ubuntu23.10 -- 更新脚本（update） 一、ubuntu23.10 更新脚本 1 [wit@ubuntu:null]$ cat ~/user/tools/update 2 #!/usr/bin/env bash 3 4 5 6 echo " update " ; 7 echo ......

问题：EF出现错误An error occurred while updating the entries. See the inner exception for details 场景：适用Excel批量导入数据时，提示了以上错误 解决思路： 1、查看是否有重复的主键 2、是否有不可为空的字段没有 ......

问题原因 待更新的目标表不能直接出现在from子句中； 错误写法 DELETE FROM Person WHERE id NOT IN ( SELECT min( id ) FROM person t1 GROUP BY email ) 正确写法(多封装一层) DELETE FROM Person ......

thinkphp5的update方法： 返回影响数据的条数，没修改任何数据返回0 当要更新的数据和已存在数据库的数据一样时,返回的结果为0 修改失败返回false 所以在判断更新是否成功,要用 的条件进行判断 0 和 false的情况 public function update(){ $resul ......

Nessus 10.6 Auto Installer for macOS Sonoma (updated Oct 2023) 发布 Nessus 试用版自动化安装程序，支持 macOS Sonoma、RHEL 9 和 Ubuntu 22.04 请访问原文链接：https://sysin.org/bl ......

delete FROM usrlogin where member_id=(SELECT member_id FROM usrlogin WHERE login_id='#011SkhVVje27smbxek0XwjKeA=='); 会出现报错信息： You can't specify target ......

摘要 Knowledge distillation becomes a de facto standard to improve the performance of small neural networks. 知识蒸馏成为提高小型神经网络性能的事实上的标准。 Most of the previo ......

Haddop https://www.bilibili.com/video/BV1sb4y1k7cQ?p=1&vd_source=8b9de621639420a0ceb703aceed712f7 第一章、大数据简介 一、概述大数据：无论哪个机构对大数据进行定义，实际上都是围绕对海量数据进行快速有效的 ......

If the python-docx method mentioned earlier doesn't work on your computer, you can try using the pywin32 library, which allows you to interact with Mi ......

Last but not least. These set challenges consist of 8: Insecure deserialization, 9: Using Components with Known Vulnerabilities, 10: Insufficient Logg ......

Learn the ropes or hone your skills in secure programming here. These challenges will give you an understanding of 5: Broken Access Control, 6: Securi ......

Let's continue with some other very common application weaknesses. This set of levels will focus on 3: Sensitive Data Exposure and 4: XXE vulnerabilit ......

Let's start with the most critical application weaknesses. These challenges get you the foundations of 1: Injection Flaws and 2: Broken Authentication ......

Windows Server 2016 OVF, updated Oct 2023 (sysin) - VMware 虚拟机模板 2023 年 10 月版本更新，现在自动运行 sysprep，支持 ESXi Host Client 部署 请访问原文链接：https://sysin.org/blog/ ......

Windows Server 2019 OVF, updated Oct 2023 (sysin) - VMware 虚拟机模板 2023 年 10 月版本更新，现在自动运行 sysprep，支持 ESXi Host Client 部署 请访问原文链接：https://sysin.org/blog/ ......

Let’s start with the most critical application weaknesses. These challenges get you the foundations of 1: Broken Access Control and 2: Cryptographic F ......

Missing Function Access Control Access to these functionalities should be restricted to authenticated users. However, the current mechanism only check ......

(1)MySQL使用 UPDATE hayl_service_info t1 left join hayl_Old_info t2 on t1.CERT_NO =t2.CERT_NO set t1.AAP0112 = t2.ADDRESS where t1.AAP0112='' (2)SQL Ser ......

查看表大小 -- 查出所有表（包含索引）并排序 -- 查出所有表（包含索引）并排序 SELECT table_schema , table_name AS table_full_name, pg_size_pretty(pg_total_relation_size('"' || table_sche ......

(base) cloud@Robot bin % flutter doctor --android-licenses Android sdkmanager not found. Update to the latest Android SDK and ensure that the cmdline- ......

A表的update 关联B表的条件。 update a set khddh ='ceshi' from formtable_main_291 a left join workflow_requestbase b on a.requestid = b.requestid where b.current ......