node-mysql

Make MySQL's ORDER BY dynamic in node.js

由 五迷三道 提交于 2021-02-10 05:56:48
问题 I want to make the ORDER BY dynamic in mysql query in node.js. But it's not working. I console.log the multiQuery variable and everything looks perfect but when ran it simply doesn't work. This is what I have: var order, multiQuery; if(req.query.o){ order = req.query.o; }else{ order = "views"; } multiQuery = 'SELECT COUNT(Category) AS Count FROM posts;'; //PROBLEM LIES HERE IN THE SECOND ONE multiQuery += 'SELECT ID, Title, Img_path, Category, Views FROM posts WHERE Category = ' + connection

Nodejs Cluster with MySQL connections

由 ╄→尐↘猪︶ㄣ 提交于 2021-02-07 07:17:34
问题 Looking on advice on clustering of Nodejs and the method of connection to mysql server. Do we open one connection for each child process or just one single connection for all processes? Or do we create a connection pool for all the child processes? Which is the recommended method? one node process var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'example.org', user : 'bob', password : 'secret' }); connection.connect(function(err) { if (err) { console.error('error

node.js mysql query in a for loop

由 天涯浪子 提交于 2021-02-07 03:40:52
问题 I have two queries. The first, SELECT auctions.name, wowitemdata.itemName, auctions.itemId, auctions.buyout, auctions.quantity FROM auctions INNER JOIN wowitemdata ON auctions.itemId = wowitemdata.itemID; returns data like this: { name: 'somename', itemName: 'someitemname', itemId: '0000', buyout: '0001', quantity: '5', } The 2nd query uses data from the #1 to get the count() of items cheaper than itemId. The response is to be added to #1 as a new element -> 'undercut'. My function: function

Cannot log into any account on mysql from terminal

由 怎甘沉沦 提交于 2021-01-29 10:33:21
问题 Ever since running as suggested: https://stackoverflow.com/a/50131831/3310334 alter user 'root'@'localhost' identified with mysql_native_password by 'Gzbz1H!fZ@#LyF33IqP$rAS8H#0iNc4lK8l2Md@EHxJyFK2YgfQwiKxz*0#lykWvKdWzhxh6EYKu&6ZPp1#9$%YMPb6EfDPYf2h'; I can't access mysql anymore: % mysql -u root -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) % sudo mysql Password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using

What are Best Practices for preventing SQL injection in node-mysql?

由 一曲冷凌霜 提交于 2021-01-28 18:43:08
问题 There has been some discussion on this topic (e.g. Preventing SQL injection in Node.js )but really no clear-cut clarity or a deep discussion, let alone good documentation anywhere. The node-mysql docs discuss prevention of SQL injection and some escape functions. However, it is unclear how these functions prevent SQL injection. The manual says "Strings are safely escaped." Nothing more... Is that limited to escaping some characters only? There seem to be other equivalents in node-mysql for

What are Best Practices for preventing SQL injection in node-mysql?

由 ▼魔方 西西 提交于 2021-01-28 18:31:58
问题 There has been some discussion on this topic (e.g. Preventing SQL injection in Node.js )but really no clear-cut clarity or a deep discussion, let alone good documentation anywhere. The node-mysql docs discuss prevention of SQL injection and some escape functions. However, it is unclear how these functions prevent SQL injection. The manual says "Strings are safely escaped." Nothing more... Is that limited to escaping some characters only? There seem to be other equivalents in node-mysql for

getServerSideProps and mysql (RowDataPacket)

由 爷，独闯天下 提交于 2021-01-27 16:29:53
问题 I'd like to do server side rendering with Next.js using the getServerSideProps method like explained in the docs. The data should come from a database, so I'm using the mysql package. This results in the following error: Error serializing `.assertions[0]` returned from `getServerSideProps` in "/assertion". Reason: `object` ("[object Object]") cannot be serialized as JSON. Please only return JSON serializable data types. I think the reason for this is, because the query method from mysql

getServerSideProps and mysql (RowDataPacket)

由 拈花ヽ惹草 提交于 2021-01-27 16:28:42
问题 I'd like to do server side rendering with Next.js using the getServerSideProps method like explained in the docs. The data should come from a database, so I'm using the mysql package. This results in the following error: Error serializing `.assertions[0]` returned from `getServerSideProps` in "/assertion". Reason: `object` ("[object Object]") cannot be serialized as JSON. Please only return JSON serializable data types. I think the reason for this is, because the query method from mysql

node.js mysql pool beginTransaction & connection

由 纵然是瞬间 提交于 2020-12-29 09:49:10
问题 I've been wondering if beginTransaction in node.js mysql uses multiple connections (if I have multiple queries inside the transaction) in a pool or is it only using a single connection until it is committed? 回答1: A transaction cannot be shared by multiple database connections and is always limited to a single connection. The best approach would be to acquire a connection from the pool before you begin the transaction and release it after a rollback or a commit. pool.getConnection(function(err

使用nodejs连接mysql数据库实现增删改查

由 非 Y 不嫁゛ 提交于 2020-08-12 00:41:48
首先要有数据库 使用xampp 或者 phpstudy 可以傻瓜式安装 新建一个项目文件夹 之后在这个目录下初始化package.json (npm init) 先在项目中安装mysql 和 express ,这个项目里使用express 因为express实现路由比较方便 cnpm install mysql express --save 已经安装好mysql和express 接下来创建app.js 在app.js里引入express并实例化express对象 在app.js里引入mysql 开启一个服务器 接下来创建连接 使用db.connect()方法连接 ,这个方法接收一个参数 有错误就报错 创建数据库 在一个路由里写sql语句 使用db.query来执行sql语句 db.query()方法有两个参数 ,第一个参数是要执行的语句 第二个参数是个回调函数 回调函数里可以接收错误信息,也有执行后回来的信息 依然是错误优先 接下来在浏览器里访问127.0.0.1:3000/createdb 页面上显示创建成功 数据库里已经有nodemysql数据库了 这个时候就可以在配置连接数据库里加上当前的数据库了 创建表 也是在一个路由里写sql语句 类型是 int 数值 AUTO_INCREMENT 让id 自增, VARCHAR(255) 字符串 长度255,PRIMARY KEY(ID
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