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php - In mysql, is it more efficient to use int type as a primary key field than char type?

In mysql, is it more efficient to use int type as a primary key field than char type? Due to business requirem...

From [MySQLdiscussion group] 2017-05-25 15:08:20 0  2  924

ValueError: Invalid literal for base 10 int(): ''

I'm getting this error in my code: ValueError: invalidliteralforint()withbase10:''. What does this mean? Why d...

From [MySQLdiscussion group] 2024-03-25 15:34:49 0  1  923

mysql - mac自帶數(shù)據(jù)庫？

大家好，我是一名前端，最近學koa2,開始接觸后端，用sequelize操作數(shù)據(jù)庫，數(shù)據(jù)庫用mysql,公司的電腦是window的，所以安裝了wampserver來當數(shù)據(jù)庫，但是我自己的是macbook air，聽說不用...

From [MySQLdiscussion group] 2017-04-17 16:47:30 0  3  923

How to operate mysql in python to prevent your own program from being maliciously injected later (to put it bluntly, I am asking about some key points of anti-injection in python)

Is it necessary to refer to previous anti-injection documents in languages ????such as php or java? Python-rel...

From [MySQLdiscussion group] 2017-06-14 10:50:54 0  2  922

java - How to solve the problem of mixed collation of mysql;

I use Spring JPA to operate the database mysql. When I first created the database, I set default-character-set...

From [MySQLdiscussion group] 2017-06-06 09:52:28 0  1  922

mysql - 樂觀鎖與悲觀鎖各自適用場景是什么？

悲觀鎖貌似沒法解決更新丟失的問題。見下面的例子，兩個用戶張三，李四，他們兩人可以更新同一條數(shù)據(jù)庫記錄。假設記錄為(sex,age) = (‘male’, 25)。在張三的查詢和修改的時間間隔內(nèi)，李四更新了記錄，而張三對這...

From [MySQLdiscussion group] 2017-04-17 12:01:11 0  1  921

mysql pconnect長連接是這樣理解嗎？

MySQL pconnect長久連接，是這樣理解嗎？ 有三個用戶A、B、C正在訪問網(wǎng)站。如果開啟了pconnect長連接的，那么： 第一種理解 {代碼...} 第二種理解 {代碼...}

From [MySQLdiscussion group] 2017-04-17 11:31:47 0  2  921

REGEXP in mybatis

The red box part (,sum(if(Item_169 REGEXP '^[0-9]{1,12}(.[0-9]{1,5})?$',Item_169,0))) is passed into mybatis i...

From [MySQLdiscussion group] 2017-06-06 09:51:53 0  1  920

javascript - Get json data from mysql, how does the front end process the conversion and parse the json type

console.log prompts like this: {Code...} Obtain json data from mysql, and encounter this problem. How does the...

From [MySQLdiscussion group] 2017-05-18 10:47:53 0  5  919

同步 - mysql5.7主從復制時如何忽略多張表

mysql5.7中,主從同步復制時,貌似只能設置成忽略一張表.配置成多張表時,不起作用. 單表設置可以: {代碼...} 多表設置不起作用: {代碼...} 或者是以分號隔開都不起作用 {代碼...}

From [MySQLdiscussion group] 2017-04-17 16:13:14 0  2  919

python 操作mysql,按照當前時間建立表,無法創(chuàng)建表..

1.使用python操作mysql,希望使用當前時間建立表名.但是格式化表名報錯.2.代碼如下圖: def __init__(self):      ...

From [MySQLdiscussion group] 2016-11-07 10:16:31 0  2  919

Resolving handshake inactivity timeout error in Node.js's MYSQL module

I'm using node-mysql and most of the queries work fine. But some queries don't work. I tried every version of ...

From [MySQLdiscussion group] 2023-08-22 16:34:16 0  2  918

mysql海量數(shù)據(jù)查詢的問題?

現(xiàn)在有一個表，表的數(shù)據(jù)主要是有一個phone字段，這個字段會有很多重復的數(shù)據(jù)現(xiàn)在我需要查出這個表的數(shù)據(jù)并根據(jù)phone這個字段去除重復數(shù)據(jù)我現(xiàn)在是用group by處理 但是發(fā)現(xiàn)數(shù)據(jù)量大了之后有性能問題求問下有沒有什么辦...

From [MySQLdiscussion group] 2017-02-18 13:22:15 0  2  917

How to connect to my http://localhost web server from Android emulator

How can I connect it to a localhost web server page located at http://localhost or http://127.0.0.1 in Android...

From [MySQLdiscussion group] 2023-08-23 21:31:00 0  2  915

mysql - 如何通過一個簡單的sql語句實現(xiàn)十萬條數(shù)據(jù)更新？

商城系統(tǒng) 導入用戶數(shù)據(jù)（user表 id username password pay_password） 大約10萬條，由于密碼是明文的，需要使用我們商城自己的加密方式（php方法加密），加密之后再更新 用戶表數(shù)據(jù)。 笨...

From [MySQLdiscussion group] 2017-04-17 14:38:38 0  5  915