Syntax The createIndexes command takes the following form: db.runCommand( { createIndexes: <collection>, indexes: [ { key: { <key-value_pair>, <key-value_pair>, ... }, name: <index_name>, <option1>, <option2>, .
the source-available, free-to-use, and self-managed version of mongodb syntax the createindex() method has the following form: db. collection . createindex ( < keys > , < options > , < commitquorum > ) the createindex() method takes the following parameters: parameter type description ...
对于分词(tokenization),版本3文本索引使用分隔符(delimiters),这些分隔符在 Unicode 8.0字符数据库属性列表中分类为Dash,Hyphen,Pattern_Syntax,Quotation_Mark, Terminal_Punctuation和White_Space。 例如,对于字符串"Il a dit qu'il «était le meilleur joueur du monde»",则文本索引会将«,»和空格作为分...
自我管理 Enterprise Advanced自行运行和管理 MongoDBCommunity Edition使用 MongoDB 进行本地开发 工具 Compass在 GUI 中使用 MongoDB 数据集成与第三方服务集成Relational Migrator自信地迁移到 MongoDB 查看所有产品探索整个开发套件 使用MongoDB Atlas 构建应用 ...
Syntax: db.collection.createIndex(keys, options) Parameters: NameDescriptionRequired / OptionalType keysA document that contains the field and value pairs where the field is the index key and the value describes the type of index for that field. For an ascending index on a field, specify a ...
正则语法可以参考:https://www.runoob.com/regexp/regexp-syntax.html > db.users.find({"name":/^a/}) # 查询name以a开头的文档 { "_id" : ObjectId("5d01d55e5464632726bf70b8"), "name" : "aaa", "age" : 18, "sex" : "male" } ...
You can create the following index types using wildcard syntax: Single field Geospatial Indexing all properties Here's how you can create a wildcard index on all fields: db.coll.createIndex( { "$**" : 1 } ) You can also create wildcard indexes using the Data Explorer in the Azure por...
The following example uses MongoDB Shell syntax. For driver examples of projection with aggregation, see yourdriver documentation. db.inventory.find( { }, { _id:0, item:1, status: { $switch: { branches: [ { case: {$eq: ["$status","A"] }, ...
Change streams are secure – users are only able to create change streams on collections to which they have been granted read access. Ease of use Change streams are familiar – the API syntax takes advantage of the established MongoDB drivers and query language, and are independent of the unde...
If you want to query for a specific element of an array, you can specify an index using the syntax key.index: > db.food.find({"fruit.2" : "peach"}) Arrays are always 0-indexed, so this would match the third array element against the string "peach". $size A useful conditional for...