Mongodb-java-driver Basic Usage

1, first download Mongodb-java-driver the latest version is 2.9.3

2. The following is the basic CRUD sample code:

1  PackageMongoDB;2 3 ImportCom.mongodb.BasicDBObject;4 ImportCom.mongodb.DB;5 Importcom.mongodb.DBCollection;6 ImportCom.mongodb.DBCursor;7 ImportCom.mongodb.DBObject;8 ImportCom.mongodb.Mongo;9 Importjava.net.UnknownHostException;Ten ImportJava.util.Set; One  A Importorg.junit.Test; -  -  Public classTestmongodbdriver { the  - @Test -      Public voidTestcrud ()throwsunknownhostexception { -         //Connect to MongoDB +Mongo Mongo =NewMongo ("localhost", 27017); -  +         //Open the database test ADB db = Mongo.getdb ("Test"); at  -         //iterate through the names of all the collections -Set<string> Colls =db.getcollectionnames (); -          for(String s:colls) { - System.out.println (s); -             //Delete all collection first (similar to "table" in relational database) in             if(!s.equals ("System.indexes")) { - db.getcollection (s). Drop (); to             } +         } -  the         //Get Set EMP (if: EMP does not exist, MongoDB will automatically create the collection) *Dbcollection coll = db.getcollection ("emp"); $ Panax Notoginseng         //Delete All -Dbcursor dbcursor =Coll.find (); the          for(DBObject dbobject:dbcursor) { + Coll.remove (dbobject); A         } the  +         //Create -Basicdbobject doc =NewBasicdbobject ("name", "Yang Junming"). Append ("Sex", "male") $. Append ("Address", $                         NewBasicdbobject ("postcode", "201202"). Append ( -"Street", "No. No. 888 TianLin Road"). Append ("City", "Shanghai")); - Coll.insert (DOC); the  -         //RetrieveWuyiBasicdbobject DocFind =NewBasicdbobject ("name", "Yang Junming"); theDBObject Findresult =Coll.findone (docfind); - System.out.println (findresult); Wu  -         //Update AboutDoc.put ("Sex", "MALE");//Change the sex attribute from "male" to "MALE" $ coll.update (DocFind, doc); -Findresult =Coll.findone (docfind); - System.out.println (findresult); -  AColl.dropindexes ();//Delete all indexes first +         //CREATE INDEX theColl.createindex (NewBasicdbobject ("name", 1));//1 stands for ascending -     } $  the}

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Extended reading:
Mondodb-java-driver official online documentation

8-Day learning through MongoDB series

MongoDB Basic Usage