mongodb共17课含代码java api该是翻译的章节根据自己理解而成

MongoDBJavaMongoDBJavaDriver简单操一、Java（10个DBmdb=mongo.getDB('dbname');//DBDBCollection是绝对线程安全的，它们被缓存起来了，所以在应用中取到的可能是同一个对象。JavaDBObject接口，方便我们保存对象到数据库中。publicclassTweetimplementsDBObject }Tweettweet=newTweet();tweet.put("user",userId);tweet.put("message",message);tweet.put("date",newDate());Mongom=newMongom=newMongo("localhost");Mongom=newMongo("localhost",27017);DBdb=m.getDB("mydb);四、认证（可选的Set<String>colls=db.getCollectionNames();for(Strings:colls){}DBCollectioncoll=JSON{"name":"type":"database","count":1,x:y:}}DBObjectdoc=newBasicDBObject();doc.put("name","MongoDB");DBObjectinfo=newBasicDBObject();info.put("x",203);doc.put("info",info);八、查询第一个文档findOne():():（DBCursorDBObjectdoc=coll.findOne();{"_id":"49902cde b45c2c","name":"MongoDB","type":"database","count":1,"info":{"x":203,"y":102},"_ns":"testCollection"}{"i":}for(inti=0;i<100;i++)}coll，我们完全可以插入不同风格的数据，这就是MongoDBlgt=l.ettemtitltDBCursorcursor=while(cursor.hasNext()){DBObjectobject=cursor.next();}DBObjectquery=newBasicDBObject();query.put("i",71);cursor=DBObjectobject=cursor.next();}{"_id":"49903677516250c1008d624e","i":71,"_ns":query=newquery.put("i",newBasicDBObject("$gt",50));//i>50cursor=coll.find(query);while(cursor.hasNext()){DBObjectobject=cursor.next();}20<i<=30：querynew//query.put("i",newBasicDBObject("$gt",20).append("$lte",30));cursor=coll.find(query);while(cursor.hasNext()){DBObjectobject=cursor.next();}coll.createIndex(newBasicDBObject("i1))1代表升序List<DBObject>list=coll.getIndexInfo();for(DBObjectindex:list)｛}{"name":"i_1","ns":"mydb.testCollection","key":{"i":1},"_ns":MongoDB的管Mongom=newfor(Strings:m.getDatabaseNames()){}MongoDBJava类ObjectIdObjectIdid=newObjectId();ObjectIdcopy=newObjectId(id);Patternjohn= pile("joh?n",CASE_INSENSITIVE);DBObjectquery=newBasicDBObject("name",john);//"name"/joh?n/iDBCursorcursor=Datenow=newDBObjecttime=newBasicDBObject("ts",now);四、数据库DBRefaddressRef=newDBRef(db,"foo.bar",address_id);DBObjectaddress=addressRef.fetch();DBObject=DBObjectfred=DBRefaddressObj=(DBRef)fred.get("address");JSON{"x":"y":}}MongoDB中，JavaDBObjecty=newBasicDBObject("y",3);DBObjectx=newBasicDBObject("x",List的对象，在MongoDB中，都被当成是数组。JSON数据：{"x":[{"foo":"bar