newValues){consturi='mongodb://localhost:27017';constclient=newMongoClient(uri);try{awaitclient.connect();constdatabase=client.db('mydb');constcollection=database.collection('mycollection');awaitcollection.updateOne({_id:ObjectId(id)},{$set:newValues});console.log('Document updated successfully'...
执行以上代码后,Bob的信息将变为{ "_id": 2, "name": "Alice", "age": 25 }。 示例代码 下面是一个完整的示例代码,演示了如何使用updateBy操作将一个文档的字段值赋值给另一个文档: // 建立连接constMongoClient=require('mongodb').MongoClient;consturl='mongodb://localhost:27017';constdbName='my...
update( { _id: 2 }, { item: "XYZ123", stock: 10, info: { publisher: "2255", pages: 150 }, tags: [ "baking", "cooking" ] } ) ### 3. 使用管道 更新 ## 从MongoDB 4.2开始,该db.collection.update()方法可以接受一个聚合管道数组 [ <stage1>, <stage2>, ... ]。管道可以包括...
db.products.update( { _id: 100 }, { $set: { quantity: 500, details: { model: "14Q3", make: "xyz" }, tags: [ "coats", "outerwear", "clothing" ] } } ) 更改后查询: db.products.find({"_id":100}).pretty() 返回结果: { "_id" : 100, "sku" : "abc123", "quantity" :...
db.col.update( { "count" : { $gt : 10 } } , { $inc : { "count" : 1} },false,false ); 删除文档 remove() 方法的基本语法格式如下所示: db.collection.remove( <query>, <justOne> ) 删除一条记录 db.testList.remove({'name':'kkk is null'},1); ...
接着我们通过 update() 方法来更新标题(title): >db.col.update({'title':'MongoDB 教程'},{$set:{'title':'MongoDB'}})WriteResult({"nMatched":1,"nUpserted":0,"nModified":1})# 输出信息>db.col.find().pretty(){"_id":ObjectId("56064f89ade2f21f36b03136"),"title":"MongoDB","desc...
Update update = new Update(); update.inc("likenum"); mongoTemplate.updateFirst(query, update, Comment.class); } public Page<Comment> findByUseridAndLikenum(String userid, int likenum, int page, int size) { return commentRepository.findByUseridAndLikenum(userid, likenum, PageRequest.of(pa...
MongoDBDatabaseCreateUpdateParameters.id() Returns: the id value. name public String name() Get the name property: The name of the resource. Overrides: MongoDBDatabaseCreateUpdateParameters.name() Returns: the name value. options public CreateUpdateOptions options() ...
The update() method does not replace the _id value. For an example, see Replace All Fields. update() cannot update multiple documents. Upsert Option Upsert Behavior If upsert is true and no document matches the query criteria, update() inserts a single document. The update creates the new ...
removeUserByUserName(String name) { Query query=new Query(new Criteria("name").is(name)); mongoTemplate.remove(query,User.class); } //通过用户id来更新名字 @Override public void updateUser(User user) { Query q=new Query(new Criteria("id").is(user.getId())); Update update=new Update(...