mongoDB的update查询条件?

Question

小白提问.

db.users.insert({"name": "demo"})

以上插入十遍.

db.users.update({"name": "demo"}, {$set: {"age": 24}})

这条案例来说应该十条记录全部匹配上,但是为什么仅仅匹配了第一条呢?

Answer 1

https://docs.mongodb.org/getting-started/shell/update/#update-multiple-documents

Answer 2

The foundation is not very solid, please read the manual more.

db.users.update({"name": "demo"}, {$set: {"age": 24}},{multi: true})

db.collection.update(
   <query>,
   <update>,
   {
     upsert: <boolean>,
     multi: <boolean>,
     writeConcern: <document>
   }
)

Answer 3

db.users.update({},{},true,true) The contents in the curly brackets remain unchanged. The default is to update one item. Just add the two parameters true!