Node connection MySQL

1. development environment vue+ node
2. computer system windows 10 pro
3. In the process of development , We always use A back-end language To manipulate the database , I chose node, The database is mysql , Let me briefly say , Use node How to connect mysql database , And return the queried database data to the front end . The method is as follows :
4. stay node Add the following code to the interface in :

 4.1  First   To install   stay  node  Install in  mysql , The code is as follows :
npm install mysql --save 

4.2 I don't say much nonsense , Operate directly :

 // newly build  mysql  Folder ,mysql Under the new index.js, The code is as follows 
const mysql=require(`mysql`);
const connection = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: 'chen',
    database: 'chen',
    port: '3306'
});

// Create a connection
connection.connect(function(err){
    if(err){
        console.log(' The connection fails :'+err);
        return;
    }
    console.log(' Successful connection ');
});
module.exports=connection;

4-3. Use... In the corresponding interface

const  connection=require('../mysql')

router.post("/",function(req,res,next){
    console.log(req.body);
    console.log("+++++++++++");
    connection.query("select * from userTable where name='"+req.body.name+"'",(err,result)=>{
        if(err){
            console.log(" The query failed "+err);
        }else{
            console.log(result);
           let data=undefined;
            if(result.length===0){
                data={
                    code:200,
                    msg:" The request is successful , Temporarily no data ",
                    data: result,
                }
            }else {
                data={
                    code:200,
                    msg:" The request is successful , Registered interface ",
                    data:result
                };
            }
            res.json(data);
        }
    })
})

module.exports = router;

4-4. Expand

// Be careful : If you report an error when connecting to the database , The content of the error report is as follows :
ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

 Don't panic when you see this mistake , The solution is as follows :
 The first step is to enter  mysql , You can enter  mysql  command , Execute the following command :
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'chen';
// Be careful ： This   Local  chen  It's the database password .

5. This sharing ends here , Is it simple ! Let's work together to get to the top ! Don't bow your head don't give up .