Nodejs operation mongodb fourth (the use of methods)

1. mongooseBuilt-in CURDofficial website address

• Model.deleteMany()
• Model.deleteOne()
• Model.find()
• Model.findById()
• Model.findByIdAndDelete()
• Model.findByIdAndRemove()
• Model.findByIdAndUpdate()
• Model.findOne()
• Model.findOneAndDelete()
• Model.findOneAndRemove()
• Model.findOneAndReplace()
• Model.findOneAndUpdate()
• Model.replaceOne()
• Model.updateMany()
• Model.updateOne()

Two, schemaextend the static method yourself

• 1. schemaExtend static methods in

  UserSchema.statics.findByName = function(name, callback) {
        
        
      this.findOne({
        
        name}, (err, docs) => {
        
        
          callback(err, docs);
      })
  }
  

• 2. Use static methods

  UserModel.findByName('张三', (err, docs) => {
        
        
      console.log(docs);
  })
  

Three, schemaextend the instance method yourself

The so-called instance method is similar to the savefunction when creating data

• 1. schemaExtend the example method in (the project is less used)

  // 扩展实例方法
  UserSchema.methods.print = function(){
        
        
      console.log(this, '实例方法');
  }
  

• 2. Use custom instance methods

  var user = new UserModel({
        
        
      name: '   李四   ',
      age: 20,
      message1: 'hello',
      message2: 'word'
  });
  
  user.print();