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node中怎么封装mysql？下面本篇文章给大家介绍一下node.js封装mysql处理语句的方法，希望对大家有所帮助！
在以往接口中一般都是直接在路由中书写相关处理语句，造成代码冗余性，今天使用express框架来进行相关mysql的语句封装。
一.所需包
npm i mysql -Snpm i express -S
登录后复制二.MySql连接文件
const mysql = require("mysql")function createConnection() { const connection = mysql.createConnection({ host: "", //地址 user: "", //用户名 password: "", //密码 port: "", //端口 database: "" //数据库名 }); return connection;}module.exports.createConnection = createConnection;登录后复制【相关教程推荐：nodejs视频教程、编程教学】
三.封装文件
const mysql = require("../mysql/mysql")let connection = null;connection = mysql.createConnection();/** * 错误消息 */let bad_msg = { code: 500, msg: "内部错误！"}/** * 成功消息 */let success_msg = { code: 200, msg: "操作成功"}const connections = { /** * 查询方法 * @param {*} table 表名 * @param {*} condition 条件 * @param {*} params 参数 * @param {*} search 查询条件 * @returns */ find(table, condition, params, search = "*") { return new Promise((resolve, reject) => { let sql = `SELECT ${search} FROM ${table} WHERE ${condition}` connection.query(sql, params, (err, result) => { if (err) { reject(bad_msg) } else { let _ = JSON.parse(JSON.stringify(success_msg)) _.data = result resolve(_) } }) }) }, /** * 插入方法 * @param {*} table 表名 * @param {*} condition 条件 * @param {*} params 参数 * @returns */ insert(table, condition, params) { return new Promise((resolve, reject) => { const str = "?" let _ = str.repeat((condition.split(",")).length) let val = (Array.from(_)).toString() let sql = `INSERT INTO ${table}(${condition}) VALUES(${val})` connection.query(sql, params, (err, result) => { if (err) { reject(bad_msg) } else { resolve(success_msg) } }) }) }, /** * 更新方法 * @param {*} table 表名 * @param {*} val 值 * @param {*} condition 条件 * @param {*} params 参数 * @returns */ update(table, val, condition, params) { return new Promise((resolve, reject) => { let sql = `UPDATE ${table} SET ${val} WHERE ${condition}` connection.query(sql, params, (err, result) => { if (err) { reject(bad_msg) } else { resolve(success_msg) } }) }) }, /** * 删除方法 * @param {*} table 表名 * @param {*} condition 条件 * @param {*} params 参数 * @returns */ del(table, condition, params) { return new Promise((resolve, reject) => { let sql = `DELETE FROM ${table} WHERE ${condition}` connection.query(sql, params, (err, result) => { if (err) { reject(bad_msg) } else { resolve(success_msg) } }) }) },}module.exports = connections登录后复制四.使用
我们使用登录注册来进行演示：
const express = require("express")const router = express.Router()const connections = require("../../static/connection")// token生成插件模块const jwt = require("jsonwebtoken");// Token签名var secret = ""const CreatId = require("../../static/ranId")router.post("/user/details", (req, res) => { connections.find("user_table", `ID=?`,req.user.ID).then(resp => { res.send(resp) })})router.post("/api/login", (req, res) => { connections.find("user_table", "user=?", req.body.user).then(resp => { let {data} = resp if (data.length !== 0) { for (let i = 0; i < data.length; i++) { // 邮箱或者密码不正确的时候 if (req.body.user !== data[i].user || req.body.pwd !== data[i].pwd) { res.send({ code: 202, msg: "用户名或密码有误!" }) } else { // 邮箱和密码输入正确 if (req.body.user === data[i].user && req.body.pwd === data[i].pwd) { // 传输的token内容 let token = jwt.sign({ ID: data[i].ID }, secret, { expiresIn: "72H" }); // 返回结果 res.send({ code: 200, msg: "操作成功！", token: "Bearer " + token, }) } } } } else { res.send({ code: 400, msg: "账号不存在请注册!" }) } }).catch(e => { res.send(e) })})router.post("/api/register", (req, res) => { connections.find("user_table", "user=?", req.body.user).then(resp => { if (resp.data.length > 0) { res.send({ code: 202, msg: "该用户已经存在！" }) } else { let _ = req.body let id = CreatId(3) + CreatId(3) connections.insert("user_table", "ID,user,pwd,avatarUrl,location,RegisterTime,isAdmin,isDel", [id, _.user, _.pwd, "/static/userimg/user.webp", _.location, Date.now(), 0, 0]).then(resps => { // 传输的token内容 let token = jwt.sign({ ID: id }, secret, { expiresIn: "72H" }); // 返回结果 res.send({ code: 200, msg: "操作成功！", token: "Bearer " + token, }) }) } })})module.exports = router登录后复制更多node相关知识，请访问：nodejs 教程！
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