"opcounters" : { "insert" : 9, "query" : 53, "update" : 9, "delete" : 0, "getmore" : 59219, "command" : 149822 }, "opcountersRepl" : { "insert" : 0, "query" : 0, "update" : 0, "delete" : 0, "getmore" : 0, "command" : 0 }, "repl" : { "setName...
2. 增删改查: CURD(create, update,read,delete) create: 创建(插入) 假如collection之前不存在,会自动创建一个collection; 如果存在,会向已存在的collection假如新增的documents # 创建一个名为inventory的collection并向其中插入一条document db.inventory.insertOne( { item: "canvas", qty: 100, tags: ["cott...
参数解释:update 字段更新操作符: 数组字段 参数解释:options upsert : multi : writeConcern: arrayFilters: collation: hint: let: mongoDB 更新操作不亚于查找操作,所以学好更新也是很重要的。如果对查询还不熟悉,可以看我之前的文章:码农曾阿牛:MongoDB 各种复杂查询彻底弄明白 接下来,我们将彻底讲清楚update语...
Update Multiple Documents New in version 3.2. The following example uses thedb.collection.updateMany()method on theinventorycollection to update all documents whereqtyis less than50: copy copied db.inventory.updateMany({"qty":{$lt:50}},{$set:{"size.uom":"in",status:"P"},$currentDate:{las...
update() 方法不会批量替换文档(update multiple documents)。 更新插(Upsert) 选项 更新插(Upsert) 行为 如果upsert 选项的值是 true 且没有匹配到查询条件的文档, update() 方法会插入一条文档记录。update方法会这样插入一条新文档记录: 用传给 <update> ...
update Definition update The update command modifies documents in a collection. A single update command can contain multiple update statements. Tip In mongosh, this command can also be run through the updateOne(), updateMany(), replaceOne(), findOneAndReplace(), and findOneAndUpdate() helper ...
https://docs.mongodb.com/manual/tutorial/update-documents/ #其他的也是如此,点击页面最下面,右击就能看到这个此操作详细的参数说明。 updateOne() 的参数: db.collection.updateOne( <filter>, <update>, { upsert: <boolean>, writeConcern: <document>, ...
Update all the document: "multi" Increase level_required by 2, apply to all the documents match {powers: "Fire"}: db.wands.update( {powers:"Fire"}, {"$inc":{level_required: 2}}, {"multi":true} ) Create new document if there is no existing one: "upsert" ...
Update all documents where the address starts with the letter "S": importpymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["mydatabase"] mycol = mydb["customers"] myquery = {"address": {"$regex":"^S"} } ...
1 db.student.update({"name":"小明"},{$set:{"age":16}}); 查找数学成绩是 70,把年龄更改为 33 岁: 1 db.student.update({"score.shuxue":70},{$set:{"age":33}}); 更改所有匹配项目:" By default, the update() method updates a single document. To update multiple documents, use ...