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背景： MySQL 5.5开始新增一个数据库：PERFORMANCE_SCHEMA，主要用于收集数据库服务器性能参数。并且库里表的存储引擎均为PERFORMANCE_SCHEMA，而用户是不能创建存储引擎为PERFORMANCE_SCHEMA的表。 MySQL 5.5默认是关闭的，需要手动开启，在配置文件里添加： view source print ? 1. [mysqld] 2. performance_schema=ON 查看是否开启： view source print ? 1. mysql>show variables like 'performance_schema' ; 2. +--------------------+-------+ 3. | Variable_name | Value | 4. +--------------------+-------+ 5. | performance_schema | <strong>ON</strong> | 6. +--------------------+-------+ 从MySQL5.6开始，默认打开，本文就从MySQL5.6来说明，在数据库使用当中PERFORMANCE_SCHEMA的一些比较常用的功能。具体的信息可以查看官方文档。 相关表信息： 一：配置（setup）表： view source print ?

I'm trying to redefine the keys used to navigate the history when inside several commands accepting regexps and offering C-p / C-n history navigation. I'd like to use other keys, in addition to C-p / C-n. For example when using occur or replace-regexp , C-p and C-n can be used to go to previous and next elements. I've tried several things but can't make it work. I think I'm missing the "big picture" here. Which mode-map do I need to modify, when and how? Everything I tried failed. P.S: Note that I've got my own minor mode with all my keymaps as adviced here. I'm assuming you just needed

Why was argument dependent lookup (ADL) invented? Is it just so we can write cout << stuff instead of std::operator<<(cout, stuff) ? If that is the case, why wasn't ADL limited to operators instead of all functions? Could the introduction of ADL have been prevented if C++ had had some other way to do generic output of both built-in and user-defined types, for example a type-safe printf via variadic templates? ADL was invented to allow the Interface Principle: The Interface Principle For a class X, all functions, including free functions, that both "mention" X, and are "supplied with" X are

我们都知道JavaScript有history对象，主要是用来记录浏览器窗口的浏览记录。但是，JS脚本是不允许访问到这个记录里面的内容（隐私）。 常见的用法是： history.back();//返回上一页，相当于浏览器上后退功能。 history.forward();//去到下一页，相当于浏览器的前进功能。 histoty.go(int);//去到指定的浏览历史记录页面。int是正的时候，就是向前int个历史记录，如果没有那么多，就没有行为。int是负数的时候那么就会向后 退int个记录，如果没有那么多的时候，也没有行为。0我试了下是没有任何行为。 注意：以上3个方法并不像你去BAIDU出来的结果解释的那样会刷新页面，这是不正确的。经过我去stackoverflow查看，同时也参考了《JavaScript权威指南》， 都表示并不是刷新从而载入新的文档。《JavaScript权威指南》中明确的说道：现代浏览器应用可以不通过载入新的文档而动态的改变自身的内容。所以，如果是 想要实现history.back()或者histoty.go(-1)后刷新页面状态，很抱歉，仅仅用history对象是完成不了任务的。 经过实验，JS 的location对象在使用history.back()之后，并不是指history.back()这个页面，而是调用history.back()这个方法的时候的页面

I have two Activities FirstActivity and SecondActivity. FirstActivity has an intent filter MAIN, LAUNCHER and DEFAULT. SecondActivity is just a normal activity and no other flags is set in the AndroidManifest. My application is C2DM enabled and when a notification is received a taskbar Icon is displayed and when clicked it opens SecondActivity. Arrival of Notifications has two scenarios: First, My Application is Already Running when notification arrived and second My Application is totally not running. On the first scenario, everything is fine. A notification is received, i clicked from the

一直存在一个warning：Please use `require("history").createHashHistory` instead of ...... 报错信息 解决方法； 把这两行代码：// import creatHistory from 'history/createHashHistory' //返回上一页这段代码 // const history = creatHistory();//返回上一页这段代码 改为： const createHistory = require("history").createHashHistory const history = createHistory() 来源： https://blog.csdn.net/u010565037/article/details/102457651

The title is not exact, but I can't express it better in a single line. I actually know how to change git commit message like here . But I know it always changes the SHA-1 too, which I want to avoid. I only want to see a different message in git-log . I thought it could be done somehow using git-notes , but I haven't managed it. Explanation: I need it in order to fix errors in the commit messages. I always write there the name of a document containing my communication with the customer (it looks just like T1234 Replace foo by bar ). The communication tends to be quite long, so I can loose a