node省市区三级数据性能测评实例分析

'use strict';
const Controller = require('egg').Controller;
class HomeController extends Controller {
 async index() {
  const { ctx } = this;
  ctx.body = 'hi, egg';
 }
 async city() {
  const { ctx } = this;
  console.time("sql")
  const provinces = await this.app.mysql.select('provinces')
  const citys = await this.app.mysql.select('cities')
  const areas = await this.app.mysql.select('areas')
  console.timeEnd("sql")
  console.time('cal')
  provinces.forEach(province => {
   let provinceid = province.provinceid
   province.children = []
   citys.forEach(city => {
    city.children = []
    if (city.provinceid === provinceid) {
     province.children.push(city)
    }
    let cityid = city.cityid
    areas.forEach(area => {
     if (area.cityid === cityid) {
      city.children.push(area)
     }
    })
   })
  })
  console.timeEnd('cal')
  const result = {
   status: 1,
   data: provinces,
  }
  ctx.body = result;
 }
}
module.exports = HomeController;

'use strict';
const Controller = require('egg').Controller;
class HomeController extends Controller {
 async index() {
  const { ctx } = this;
  ctx.body = 'hi, egg';
 }
 async city() {
  const { ctx } = this;
  console.time("sql")
  let provinces = await this.app.mysql.select('provinces')
  let citys = await this.app.mysql.select('cities')
  let areas = await this.app.mysql.select('areas')
  console.timeEnd("sql")
  console.time('cal')
  for (let i = 0, len = citys.length; i < len; i++) {
   let city = citys[i]
   city.children = []
   let cityid = city.cityid
   for (let j = 0, len1 = areas.length; j < len1; j++) {
    let area = areas[j]
    if (area.cityid === cityid) {
     city.children.push(areas.splice(j, 1)[0])
     len1--
     j--
    }
   }
  }
  provinces.forEach(province => {
   let provinceid = province.provinceid
   province.children = []
   for (let i = 0, len = citys.length; i < len; i++) {
    let city = citys[i]
    if (city.provinceid === provinceid) {
     province.children.push(city)
     citys.splice(i, 1)
     len--
     i--
    }
   }
  })
  console.timeEnd('cal')
  const result = {
   status: 1,
   data: provinces,
  }
  ctx.body = result;
 }
}
module.exports = HomeController;