node 连接MySQL

const mysql = require('mysql')

const config = require('./../../config/config.default')

var connection = mysql.createConnection({
  host: config.database.HOST,
  user: config.database.USERNAME,
  password: config.database.PASSWORD,
  database: config.database.DATABASE
})

connection.connect(function(err) {
  if (err) {
    console.error('error connecting: ' + err.stack)
    return
  }
  console.log('Database connection successful, connected as id ' + connection.threadId)
})

//查询
// connection.query(`select * from area`, function(err, results, fields) {
//   if (err) throw err
//   console.log(results[0])
//   console.log(fields[0])
// })



//关闭连接
// connection.end(function(err) {
//   if (err) {
//     console.error('数据库关闭失败' + err)
//   }
//   console.log('数据库关闭')
// })

module.exports = connection