If mongoose exists, it will be updated; if it does not exist, it will be added

【findOneAndUpdate 】

• Modification of existence , There is no such thing as doing nothing

      let mong_result = await this.case_main_keys_mongodb.findOneAndUpdate({
    
            'name': ' Li Si '
        }, {
    
            $set: {
    
                ' Sequence _1': '333',
           }
        }, {
    })
 

• Modification of existence , And back to Revised data , There is no such thing as doing nothing

      let mong_result = await this.case_main_keys_mongodb.findOneAndUpdate({
    
            'name': ' Li Si '
        }, {
    
            $set: {
    
                ' Sequence _1': '333',
           }
        }, {
     new: true})
 

• Modification of existence , If it doesn't exist, add , And back to （ modify or newly added ） Later data ,

      let mong_result = await this.case_main_keys_mongodb.findOneAndUpdate({
    
            'name': ' Li Si '
        }, {
    
            $set: {
    
                ' Sequence _1': '333',
           }
        }, {
    upsert: true,  new: true})

 

---

Be careful ：

$setOnInsert and $set Attribute records in cannot be the same

mongo UPDATE statement using $setOnInsert、$upsert and $set、$upsert The difference between
For the queried records .

Use $set、$upsert If it exists, it will be updated , If it doesn't exist, add

Use $setOnInsert、$upsert There is no operation , If it doesn't exist, add