node连接mysql,并操作mysql方式

//需要在文件夹下载mysql模块
//npm install mysql
const mysql=require('mysql')
 
var coonnection=mysql.createConnection({
    host:'localhost',
    user:'root',
    password:'123456',
    database:'datashow'
})
 
coonnection.connect(function(err){
    if(err){
        console.log("connect is not good"+err.stack)
        return ;
    }
    console.log("connect is ok"+coonnection.threadId)
})

//断开数据库连接
connection.end()

const mysql=require('mysql')
 
var coonnection=mysql.createConnection({
    host:'localhost',
    user:'root',
    password:'123456',
    database:'datashow'
})
 
coonnection.connect(function(err){
    if(err){
        console.log("connect is not good"+err.stack)
        return ;
    }
    console.log("connect is ok:   "+coonnection.threadId)
})
 
var sql='select * from student'
 
coonnection.query(sql,(err,result)=>{
    if(err) throw err
    console.log(result)
})

const mysql=require('mysql')

var coonnection=mysql.createConnection({
    host:'localhost',
    user:'root',
    password:'123456',
    database:'datashow'
})

coonnection.connect(function(err){
    console.log("connect is ok:   "+coonnection.threadId)
})

//用于向数据库添加数据
var addSql='INSERT INTO student VALUES(?,?,?,?,?)'
var addSqlDate=['116','糖糖','女','1999-2-3','2003']

coonnection.query(addSql,addSqlDate,(err,result)=>{
    if(err) throw err
    console.log('添加成功')
})

//用于向数据库更新指定的数据
var updatesql='UPDATE student SET sName=?,sSex=? WHERE sNo=?'
var updatesqlDate=['青青','女',103]

coonnection.query(updatesql,updatesqlDate,(err,result)=>{
    if(err) throw err
    console.log('修改成功')
})


//用于向数据库删除指定的数据
var deletesql='DELETE FROM student where sNo=?'
var deletesqlDate=['104']

coonnection.query(deletesql,deletesqlDate,(err,result)=>{
    if(err) throw err
    console.log('删除成功')
})