node连接mysql数据库基本用法

const mysql = require('mysql')
const pool = mysql.createPool({
host: '',
port: '',
user: '',
password: '',
database: '',
connectionLimit:  
})

function connect(sql,arr){
  return new Promise((resolve,reject)=>{
    pool.query(sql,arr,(err,data)=>{
      if(err) reject('数据库连接异常!')
      resolve(data)
    })
  })
}

module.exports=connect