Because MongoDB creates a collection implicitly when the collection is first referenced in a command, this method is used primarily for creating new collections that use specific options. For example, you usedb.createCollection()to create acapped collection, or to create a new collection that uses...
db.createCollection()is a wrapper around the database commandcreate. Thedb.createCollection()method has the following prototype form: db.createCollection(<name>,{capped:<boolean>,autoIndexId:<boolean>,size:<number>,max:<number>,storageEngine:<document>,validator:<document>,validationLevel:<string>...
db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb, todb, fromhost) - deprecated db.createCollection(name, {size: ..., capped: ..., max: ...}) db.createView(name, viewOn, [{$operator: {...}}, ...], {viewOptions}) db.createUser(userDocument) db.cu...
db.foo.insert({_id:1,name:"test"}) 3,显式创建Collection 使用db.createCollection() 显式创建Collection,通过指定Collection Option,创建特定用途的Collection。 Because MongoDB creates a collection implicitly when the collection is first referenced in a command, this method is used primarily for creatin...
> db.createCollection("players") 1. 命令执行后,就会在当前数据库创建一个名为 players 的集合。这里使用 show tables 验证集合是否创建成功: > show tables 1. 命令执行后,终端会输出集合列表,而 players 也在其中,这说明显式创建集合的方法也是可行的。
switched to db shop 1. 2. 1.3:查看表 > show collections user > show tables user 1. 2. 3. 4. 1.4.1:创建库/表 > use good switched to db good > db.createCollection('items') { "ok" : 1 } 1. 2. 3. 4. 1.4.2:创建库/表第二种方式 ...
db.createCollection("集合名称")删除集合db.集合名称.drop()删除数据库db.dropDatabase() //首先要通过use切换到当前的数据库 2. Mongodb增删改查(CURD) id 系统会自动加一个 时间戳+机器码 生成 1. 增(insert) 新增一条db.userinfo.insert({name:"贾宝玉",age:25,gander:"男",address:'贾府'})...
在每個繼續權杖上使用db.collection.watch()(每個權杖一個執行緒),可有效率縮放變更串流。 JavaScript {customAction:"GetChangeStreamTokens",collection:"<Name of the collection>",startAtOperationTime:"<BSON Timestamp>"// Optional. Defaults to the time the command is run.} ...
通过在每个恢复标记(每个标记一个线程)上使用db.collection.watch(),可有效地扩缩更改流。 JavaScript {customAction:"GetChangeStreamTokens",collection:"<Name of the collection>",startAtOperationTime:"<BSON Timestamp>"// Optional. Defaults to the time the command is run.} ...
To create a collection in an existing database through the Atlas UI: 1 In Atlas, go to theClusterspage for your project. If it's not already displayed, select the organization that contains your desired project from theOrganizationsmenu in the navigation bar. ...