php - In a production environment, how can we add indexes to MySQL and modify the table structure so that our online business is not affected?

In a production environment, how can we add indexes to MySQL and modify the table structure so that our online business is not affected? Because there are writing and reading operations to the library at any time online.

某草草 2017-05-27 17:38:57 0  1  743

Many operations can be implemented directly in excel. Why do you need to write such a complicated mysql language? What are its advantages?

Many operations can be implemented directly in excel. Why do you need to write such a complicated mysql language? What are its advantages?

薄荷叶草香 2019-05-20 21:01:20 0  1  1278

python - Can I still use modles.py to operate mysql after using pymysql in django?

My environment is: Python3.6 + django1.11.1 + mysql. I use pymysql. When I learned it before, I used sqlite3. Now I use pymysql. Should I still create tables by defining classes in models.py? Why do I write like this and then execute {code...} and it doesn't work in mysql...

扔个三星炸死你 2017-06-12 09:23:48 0  3  1383

node.js - When node operates mysql, why do some query strings use backticks `` and some use double quotes ""

When using node to operate mysql, why do some query strings use backticks `` and some use double quotes ""? What is the significance of this? I hope the doubts can be answered {code...}

曾经蜡笔没有小新 2017-05-31 10:39:18 0  2  684

Solve the problem of operation error when pythonanywhere connects to MySQL database

I have finished my django project and I want to test it on PythonAnywhere, everything was fine until the mysql database connection showed an error to which I have paid subscription. An operation error occurred on /home/ (1044, "Access to database 'almx98' for user 'almx98'@'%' is denied") ...

P粉459440991 2024-03-31 22:43:19 0  1  598

How to close mysql error prompt

For example, what is the way to turn off error prompts in native mysql and pdo classes to avoid error messages being discovered by hackers. Please give me more details on how to modify it.

按键盘手指磨破皮 2017-09-22 22:32:48 0  2  1396

When inserting data encapsulated by the PHP class, the insertion is always unsuccessful and false is returned;

<?php //Database operation class class Model{ Private $host; //Database address Private $user; //Database username Private $pwd; /

A _ Ｑ _ｉ_ 2021-10-13 10:21:27 0  6  1049

TP5 provides it. What is the purpose of encapsulation here?

tp5 provides database operation classes. What is the purpose of encapsulation here?

rebirth 2019-03-05 20:42:43 0  0  1085

Return value of transaction commit?

Db::commit() can use if (Db::commit()) {Operation only if MySQL operation is successful}

不屑一顾 2018-05-10 17:44:41 0  0  766

javascript - Can I use setAttribute/removeAttribute to add or delete class names?

In a group discussion about the operation of class names in native js, someone suggested that the setAttribute and removeAttribute methods can be used to operate class names. I felt very puzzled: I thought there were only classList.add() or classList.remove(). Methods can solve this need, but someon...

过去多啦不再A梦 2017-05-19 10:46:49 0  3  1057

How to operate mysql's JSON?

Mysql's JSON field content "[{"id":"1","name":"a"},{"id":"2","name":"b"},{"id":"3 ","name":"c

世界只因有你 2017-06-06 09:52:19 0  3  728