mongodb tutorial for beginners

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Tags: http io os ar sp file data on CTIRemove () methodThe Remove () method of MongoDB is used to remove a document from the collection. The Remove () method accepts two parameters. The first one is to delete the criteria, the second is the JUSTONE flag: Deletion criteria: (optional) Delete the standard, depending on the file will be deleted. Justone: (optional) If set to TRUE or 1, then delete only one file. Grammar:The basic syntax

configuration is successful, you will see the following screen:In the browser input: http://localhost:27017/, you can see the following prompt:You is trying to access MongoDB on the native driver port. For HTTP diagnostic access, add the port numberThus, the MongoDB database service has been successfully started.To test a simple JavaScript statement with Mongo.exe:D:\mondb>mongo>3+36>db>test> Db.foo.insert

The MongoDB update () and Save () methods are used to update the collection of documents. The update () method updates the existing document value, replacing the existing document with the Save () method in the file.MongoDB Update () methodThe update () method updates the existing document values.Grammar:The basic syntax for the update () method is as follows>db. Collection_name. Update(selectioin_criteria, updated_data) ExampleConsider the

, so we also better put in the IO thread, this example is relatively simple, directly on the code:Public observableReturn Observable.create (New Observableonsubscribe@Overridepublic void subscribe (observableemitterthrows Exception { cursor cursor = null; try {cursor = Getreadabledatabase (). Rawquery ( "SELECT * from" + TABLE_NAME, new string[]{}); listnew arraylistwhile (Cursor.movetonext ()) {Result.add (Db.Record.read (cursor));} emitter.onnext ( result); Emitter.oncomplete (); } finally {if

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Ubuntu SQL tutorial for mysql beginners Ubuntu SQL tutorial for mysql beginners 1. Start the mysql database: Effect: 2. Enter mysql: Effect: 3. view all databases: Effect: 4. Create a database: Vc3ryb25np1_vcd4kpha + pgltzybzcm9 "http://www.2cto.com/uploadfile/Collfiles/20150127/2015012709552964.jpg" alt

to create a profile: mongod.cfg, the path I created is "D:\mongodb\mongod.cfg".The content of Mongodb.cfg is (according to your actual situation): 12 dbpath= D:\testMongoDB\datalogpath= D:\testMongoDB\log\mongo.log To create a MongoDB service:Sc.exe create MongoDB binpath= "\" D:\mongodb