1.安装mongoose
npm i mongoose -S||npm install mongoose --save
2.导入mongoose
const mongoose=require('mongoose')
3.连接数据库
//mongoose.connect('mongodb://主机名:端口/数据库名称') 举例:mongoose.connect('mongodb://127.0.0.1:27017/1901')
进一步做连接处理
mongoose.connect('mongodb://127.0.0.1:27017/1901',(err)=>{ if(!err){//连接成功了 console.log('database connect success'); }else{ throw err; } })
4.存储数据步骤：定义Schema (骨架) > 创建model（模型）> Entity实例化方法。
定义Schema(骨架):
//定义schema // const teacherSchema = new Schema(options) /* options { key：key的数据类型 } */ 举例: const Schema = mongoose.Schema; const studentsSchema = new Schema({ name: String, age: Number, sex: String });
创建model(模型):
//创建模型 // const teacherModel = mongoose.model(集合名称,teacherSchema) 举例: const studentsModel = mongoose.model('students', studentsSchema);
创建实例:
const studentsInstance = new studentsModel();
5.数据的增删改查:
增加数据:
//数据的存储 studentsInstance.name = 'ksjjsj'; studentsInstance.age = 50; studentsInstance.sex = 'man'; studentsInstance.save((err) => { if (!err) { //存储成功 console.log('data save success') } else { throw err } });
删除数据:
//删除数据 studentsModel.find({ age: 50 }, (err, result) => { if (!err) { //查找成功 const id = result[0]._id; studentsModel.findById(id, (err, docs) => { if (!err) { //删除成功 docs.remove(() => { console.log('data delete success'); }) } }) } else { throw err; } });
修改数据:
//修改数据 studentsModel.find({ name: 'lcj' }, (err, res) => { if (!err) { //查找成功 const id = res[0]._id; studentsModel.findById(id, (err, docs) => { docs.age = 18, docs.save((err) => { if (!err) { console.log('data update success') } else { throw err } }) }) } else { throw err; } });
查找数据:
//查找数据 studentsModel.find({ age: 50 }, (err, result) => { if (!err) { //查找成功 console.log('data find success'); console.log(result); } else { throw err; } });
