}8、连接数据库,在src目录下创建一个db目录,并在db目录中创建一个mysql.js文件用来连接数据库,mysql.js内容如下: // 引入数据库模块 const mysql = require('mysql') //引入数据库配置文件 const { MYSQL_CONFIG } = require('../config/db') // 创建连接对象 const connection = mysql.createConnection(...
在这个例子中,我们创建了一个名为users的表,其中id字段为自增ID,PRIMARY KEY表示它是主键。 3. Node.js连接MySQL 在Node.js中,使用mysql或mysql2模块可以很容易地连接和操作MySQL数据库。首先,安装mysql模块: npminstallmysql 1. 接下来,我们将设置与MySQL数据库的连接: constmysql=require('mysql');// 创建连...
Note:To be able to get the inserted id,only one rowcan be inserted. Example Insert a record in the "customers" table, and return the ID: varmysql = require('mysql'); varcon = mysql.createConnection({ host:"localhost", user:"yourusername", ...
CREATETABLE`NodeSample`.`MyTable` ( `id`INTUNSIGNEDNOTNULLAUTO_INCREMENTPRIMARYKEY, `firstname`VARCHAR(20)NOTNULL, `lastname`VARCHAR(20)NOTNULL, `message`TEXTNOTNULL ) ENGINE=MYISAM ; 连接数据库 varsys = require('sys'); varClient = require('mysql').Client; varclient =newClient(); clien...
updateAll({ data: { nickname: "John Doe" }, where: { user_id: { "<=": 5 } }, options: { enableTimestamps: true, utimeField: "utime" }, }) .executeQuery(); insertRecord const insertedUser = await userModel .insertRecord({ data: { user_id: 1, email: "123@gmail.com", ...
log('user inserted with id:', results.insertId); }); }; insertUser('John Doe', 25); 3. 执行删除(Delete)操作 要从数据库中删除数据,可以使用DELETE FROM SQL语句。以下是一个示例代码,用于根据ID删除用户: javascript const deleteUser = (id) => { const sql = 'DELETE FROM users WHERE...
除了MongoDB 之外,数据库的选项还有 MySQL,PostgreSQL,Cassandra 等。 介绍MEVN JavaScript 框架每天都在增长,无论是数量还是使用率。 JavaScript 过去只用于客户端逻辑,但多年来它已经有了显着增长,现在它在前端和后端都有使用。 在MEVN 堆栈中,Express.js 用于管理所有与后端相关的内容,而 Vue.js 处理所有与视图...
NodeId=2 # Node ID for this data node datadir=/usr/local/mysql/data # Remote directory for the data files [ndbd] hostname=198.51.100.1# Hostname/IP of the second data node NodeId=3 # Node ID for this data node datadir=/usr/local/mysql/data # Remote directory for the data f...
Return the number of inserted documents: console.log(res.insertedCount) Which will produce this result: 14 The _id Field If you do not specify an_idfield, then MongoDB will add one for you and assign a unique id for each document. ...
It returns the number of rows changed, deleted, or inserted by the last statement if it was an UPDATE, DELETE, or INSERT. For SELECT statements, mysql_affected_rows() works like mysql_num_rows(). See https://dev.mysql.com/doc/refman/5.7/en/mysql-affected-rows.html mysql_autocommit() ...