node+express build mall project (2-Establish Mysql link to complete the registration account interface)

node+express build mall project (2-operate Mysql to complete the registration account interface)

• Today we use express and mysql plugin to complete the operation of the mysql database
• Now start to install the database plug-in

npm install mysql --save-dev

• After the installation is complete, start to configure the database.
• Create a new model folder in the outer directory, create a new db.js file
• 
• In the db file, we configure the basic configuration of the link database
• There are also friends who have not installed mysql, please install it first. The blogger’s version is above 8.

var mysql = require('mysql'); //导入 mysql 模块
let dbConfig = {
    
    
    host: 'localhost', // ip
    port: '3306', // 端口号
    user: 'root', // 账户
    password: 'as946640', // 密码
    database: 'shopmall' // 数据库名称
}

• Save and then we write a query function and export the function
• The blogger here uses Promise to encapsulate more easily and clearly

module.exports = {
    
    
    query: function (sql, params, callback) {
    
    
        //每次使用的时候需要创建链接，数据操作完成之后要关闭连接
        var connection = mysql.createConnection(dbConfig)
        // 封装 Promoise 返回结果
        return new Promise((resolve, reject) => {
    
    
            connection.connect((err) => {
    
    
                // 返回错误
                if (err) reject(err)
                // 执行查询
                connection.query(sql, params, (err, rows) => {
    
    
                    if (err) reject(err)
                    // 释放连接，否则会卡顿
                    connection.end((err) => {
    
    
                        if (err) reject(err)
                    })
                    // 返回结果
                    resolve(rows)
                })
            })
        })
    }
};

• Next comes our topic. Create a new user module in the router file to handle the user interface.
• 
• Next enter the topic to write our user module user registration interface
• First, we first introduce db file operation data and express and then instantiate routing

var express = require('express');
var router = express.Router();
const db = require('./../../model/db.js')

Finally write our registration interface and export

/* 注册用户. */
router.post('/register', async (req, res) => {
    
    
  const {
    
    
    userName,
    password
  } = await req.body; // 获取 用户产地来的数据
  // 新建 插入 sql
  const sql = `INSERT INTO user (userName,password) VALUES ( '${
      
      userName}','${
      
      password}')`
  try {
    
    
    // 执行 sql查询函数 返回结果
    let blogs = await db.query(sql)
    if (blogs) {
    
    
      res.json({
    
    
        code: 200,
        msg: '注册成功'
      })
    }
  } catch (error) {
    
    
    // 错误处理
    res.json({
    
    
      code: 500,
      msg: error.sqlMessage
    })
  }
});

module.exports = router;

• Friends, remember to mount the current user.js routing file in the entry file app.js

var usersRouter = require('./routes/user/users');
app.use('/users', usersRouter);

• Now we are doing interface testing. The blogger uses ApiPost here. Domestically produced is still very powerful.

• Finally, the database looks at the data we registered

• Found that our registered data has been submitted to the database