실전 학습: Node.js가 데이터베이스를 작동하는 방법에 대해 이야기해 보겠습니다.

const mysql = require('mysql')
const db = mysql.createPool({
  host: 'localhost',
  user: 'root',
  password: '123123123',
  database: 'test',
  insecureAuth : true
})
const sql = `select *  from new_table`
db.query(sql, (err, results) => {
//   console.log(err)
  if(err){
    console.log(err.message)
  }else{
    console.log(results) //查询语句返回的是数组
  }
})

ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '这个地方替换成你的数据库密码';

const obj = {
    name:'xiaoma',
    password:'666666'
}
const insertSql = `insert into new_table (name,password) values (?,?)`
db.query(insertSql,[obj.name,obj.password],(err,res)=>{
    if(err){
        console.log(err.message)
    }else{
        console.log(res)
    }
})

 if(res.affectedRows == 1){
    console.log('insert success')
}

const obj = {
    name:'xiaoma',
    password:'123123'
}
const insertSql = `insert into new_table SET ?`
db.query(insertSql,obj,(err,res)=>{
    if(err){
        console.log(err.message)
    }
    if(res.affectedRows == 1){
        console.log('insert success')
    }
})

const updateSql = `Update  new_table set  name=? ,password=? where id=?`
// const insertSql = `insert into new_table SET ?`
db.query(updateSql,[obj.name,obj.password,obj.id],(err,res)=>{
    if(err){
        console.log(err.message)
    }
    if(res.affectedRows == 1){
        console.log('insert success')
    }
})

//简化写法
const updateSql = `Update  new_table set ? where id=?`
db.query(updateSql,[obj,obj.id],(err,res)=>{
})

const updateSql = `delete from  new_table  where id=?`
db.query(updateSql,5,(err,res)=>{
    if(err){
        console.log(err.message)
    }
    if(res.affectedRows == 1){
        console.log('insert success')
    }
})