mongodb    数据库      增删改查

      增：

       // 引入express 模块

var express = require('express');
  //  路由
var router = express.Router();
 //  引入 mongodb  数据库   括号里是连接数据库的路径
var users=require('../mgs/mgs')
// =====================================
router.get('/', function(req, res, next){
   console.log(req.query)
   users.create(req.query,function(err,result){
   if(err){console.log('写入出错')}
   else{
      console.log('写完=',result)
      res.send(result)
      }
   })
});

  //  导出
module.exports = router;

       

删：

var express = require('express');
var router = express.Router();

var users=require('../mgs/mgs')

// ====================================================

router.get('/', function(req, res, next) {
   console.log(req.query)
   // if(typeof(req.query.habit)==){req.query.habit=req.query.habit.join()}
   console.log(req.query)
   users.deleteOne(req.query,function(err,result){
   if(err){console.log('删除出错')}
   else{
      console.log('删除=',result)
      res.send(result)
      }
   })
});


module.exports = router;

改：

var express = require('express');
var router = express.Router();

var users=require('../mgs/mgs')


// ==============================


router.get('/', function(req, res, next) {
   console.log(req.query)
   users.updateOne({_id:req.query._id},req.query,function(err,result){
   if(err){console.log('改出错')}
   else{
      console.log('改==',result)
      res.send(result)
      }
   })
});

查：

var express = require('express');
// var users = require('../mgs/mgs');
var router = express.Router();
var users=require('../mgs/mgs')

// =====================================

router.get('/', function(req, res, next) {
   console.log(req.query)
   users.find({sex:new RegExp(req.query.sex)},function(err,result){
      if(err){console.log('查询出错')}
      else{
         console.log('查询成功')
         res.send(result)
      }
   })


});

module.exports = router;