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node中怎么封裝mysql？下面本篇文章給大家介紹一下node.js封裝mysql處理語(yǔ)句的方法，希望對(duì)大家有所幫助！
在以往接口中一般都是直接在路由中書(shū)寫(xiě)相關(guān)處理語(yǔ)句，造成代碼冗余性，今天使用express框架來(lái)進(jìn)行相關(guān)mysql的語(yǔ)句封裝。
一.所需包
npm i mysql -S npm i express -S
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二.MySql連接文件
const mysql = require('mysql')function createConnection() { const connection = mysql.createConnection({ host: '', //地址 user: '', //用戶(hù)名 password: '', //密碼 port: '', //端口 database: '' //數(shù)據(jù)庫(kù)名 }); return connection;}module.exports.createConnection = createConnection;
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【相關(guān)教程推薦：nodejs視頻教程、編程教學(xué)】
三.封裝文件
引入MySQL連接相關(guān)文件，進(jìn)行連接數(shù)據(jù)庫(kù)操作
const mysql = require('../mysql/mysql')let connection = null;connection = mysql.createConnection();/** * 錯(cuò)誤消息 */let bad_msg = { code: 500, msg: '內(nèi)部錯(cuò)誤！'}/** * 成功消息 */let success_msg = { code: 200, msg: '操作成功'}const connections = { /** * 查詢(xún)方法 * @param {*} table 表名 * @param {*} condition 條件 * @param {*} params 參數(shù) * @param {*} search 查詢(xún)條件 * @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 條件 * @param {*} params 參數(shù) * @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 條件 * @param {*} params 參數(shù) * @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) } }) }) }, /** * 刪除方法 * @param {*} table 表名 * @param {*} condition 條件 * @param {*} params 參數(shù) * @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
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四.使用
我們使用登錄注冊(cè)來(lái)進(jìn)行演示：
const express = require('express')const router = express.Router()const connections = require('../../static/connection')// token生成插件模塊const jwt = require('jsonwebtoken');// Token簽名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++) { // 郵箱或者密碼不正確的時(shí)候 if (req.body.user !== data[i].user || req.body.pwd !== data[i].pwd) { res.send({ code: 202, msg: '用戶(hù)名或密碼有誤!' }) } else { // 郵箱和密碼輸入正確 if (req.body.user === data[i].user && req.body.pwd === data[i].pwd) { // 傳輸?shù)膖oken內(nèi)容 let token = jwt.sign({ ID: data[i].ID }, secret, { expiresIn: '72H' }); // 返回結(jié)果 res.send({ code: 200, msg: '操作成功！', token: 'Bearer ' + token, }) } } } } else { res.send({ code: 400, msg: '賬號(hào)不存在請(qǐng)注冊(cè)!' }) } }).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: '該用戶(hù)已經(jīng)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 => { // 傳輸?shù)膖oken內(nèi)容 let token = jwt.sign({ ID: id }, secret, { expiresIn: '72H' }); // 返回結(jié)果 res.send({ code: 200, msg: '操作成功！', token: 'Bearer ' + token, }) }) } })})module.exports = router
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