//这个模块里面封装了所有对数据库的常用操作 var MongoClient = require(‘mongodb‘).MongoClient; var settings = require("../settings.js"); //不管数据库什么操作，都是先连接数据库，所以我们可以把连接数据库 //封装成为内部函数 function _connectDB(callback) {var url = settings.dburl; //从settings文件中，都数据库地址//连接数据库MongoClient.connect(url, function (err, db) {if (err) {callback(err, null);r...
mysql.js const mysql = require("mysql2"); class MysqlModel { constructor() { this.mysqlConfig = config.mysql; } /*** 实例化mysql*/mysqlInstance() { const poolCluster = mysql.createPoolCluster({ removeNodeErrorCount: 1, // Remove the node immediately when connection fails. defaultSelector: "RR" //RR,RANDOM,ORDER});const mysqlNodes = this.mysqlConfig;for (let node in mysqlN...
let MongoDB = require("mongodb")let MongoClient = MongoDB.MongoClient let ObjectID = MongoDB.ObjectIDclass Db{static getInstance(){if(!Db.instance){Db.instance=new Db()}return Db.instance}constructor(){this.dbClient="";this.connect();}connect(){let that = this;return new Promise((res,rej)=>{if(!that.dbClient){MongoClient.connect(‘mongodb://localhost:27017/‘,{ useUnifiedTopology: true},(err,clien...
1----Node.js封装mongodb增删改查 2----调用封装好的增删改查 const MongoClient = require("mongodb"). MongoClient;const url="mongodb://localhost:27017"; //增 删 改 查 function connect(callback){MongoClient.connect(url,(err,db)=>{if(err) throw err;callback(db)}) } //增 module.exports.insert=(dbname,colname,obj,callback)=>{connect((db)=>{if(!(obj instanceof Array)){obj=[obj]}db.db(dbname).collection(co...
核心参考网站：https://node-postgres.com/1.pgsql-pool.js const Pool = require('pg-pool');const config = {user: 'postgres',password: 'XXXX',host: '121.5.xx.xx',port: 5432,database: 'postgres',// ssl: true,max: 20, // set pool max size to 20idleTimeoutMillis: 1000, // close idle clients after 1 secondconnectionTimeoutMillis: 1000, // return an error after 1 second if connection could not be establish...
时间吧，总是这么凑巧，在我学习【node.js】还没几天，我的 Microsoft SQL Server Management Studio 18 就歇菜了，至于怎么歇菜的吧....它可能的意思就是想让我换电脑了... 所以为了解决问题，就写了这个小东西满足需求；....咳咳咳.... 回归正题，开始最简易的封装数据操作。 首先老样子,先安装： 安装方法npm install mssql引入依赖///引入依赖 const mssql = require(mssql);配置Config其实这里的config，和后端程序配置的web....