mongodb 基础(一)创建集合,简单查询、移除集合种文档文档 1、create a collection the name is users(the users collection contains field :createDate、name、age、grade) example: db.users.insertMany([{"createDate":"2024-01-10","name":"zhangsan","age":20,"grade":3},{"createDate":"2024-01-10...
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...
ExampleGet your own Python Server Create a collection called "customers": importpymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["mydatabase"] mycol = mydb["customers"] Run example » Important:In MongoDB, a collection is not created until it gets co...
Creates a new collection. Forviews, seedb.createView(). 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 ...
连接replica pair, 服务器1为example1.com服务器2为example2。 连接replica set 三台服务器 (端口 27017, 27018, 和27019): 连接replica set 三台服务器, 写入操作应用在主服务器 并且分布查询到从服务器。 直接连接第一个服务器,无论是replica set一部分或者主服务器或者从服务器。 当你的连接服务器有优先级...
use complex_query_example db.users.insertMany([ { name: "Alice", age: 25, city: "New York", registration_date: ISODate("2022-01-01") }, { name: "Bob", age: 30, city: "San Francisco", registration_date: ISODate("2022-02-15") }, { name: "Charlie", age: 28, city: "Los...
MongoDB\Database::createCollection() Explicitly creates a collection. function createCollection( string $collectionName, array $options = [] ): void MongoDB creates collections implicitly when you first reference the collection in a command, such as when inserting a document into a new collection....
db.users.insertOne({name:"Alice",age:30,email:"alice@example.com"}) 1. 2. 3. 4. 5. 2. 插入多个文档 如果要插入多个文档,可以使用insertMany()方法。例如: db.users.insertMany([{name:"Bob",age:25,email:"bob@example.com"},{name:"Carol",age:28,email:"carol@example.com"},{name:"...
MongoDB强类型Collection用法示例finisky.github.io/2021/02/27/mongodbstronlytypedcollectionexample/ .NET中使用MongoDB非常简单,一般来说可以直接使用BsonDocument,也可以使用定义好的数据类型对文档进行CRUD操作。本文通过实例对比一下两种方式的优劣,通常,通过强类型Collection对文档进行操作更为便捷。 BsonDocument...
db.collection.insert(document_or_array) 参数: 可以是一个文档,也可以是一个文档数组。 1、插入单个文档: db.users.insert({name:"David",age:40,email:"david@example.com"}); 2、插入多个文档: db.users.insert([{name:"Eve",age:45,email:"eve@example.com"},{name:"Frank",age:50,email:"fran...