Java Operations MONGO DB database example __ Database

Package COM.TOMPIG.LJC;
Import java.net.UnknownHostException;
Import java.util.ArrayList;
Import Java.util.Date;
Import java.util.List;
Import Java.util.Set;
Import Com.mongodb.BasicDBObject;
Import Com.mongodb.DB;
Import com.mongodb.DBCollection;
Import Com.mongodb.DBCursor;
Import Com.mongodb.DBObject;
Import Com.mongodb.Mongo;

Import com.mongodb.MongoException;
	public class Dbutil {String collectionsname = "User_info";
	String dbname = "LJC";
	Dbcollection coll = null;

	Mongo m = null;
		Public Dbutil () {try {coll = getdbcollection (collectionsname);
		catch (Exception e) {e.printstacktrace ();
		} public dbcollection getdbcollection (String collectionname) {dbcollection coll = null;
			try {m = new Mongo ("localhost", 27017);
DB db = M.getdb (dbname); if (Db.authenticate ("LJC", "007". ToCharArray ())) {//System.out.println ("Success");//} coll = Db.getcollec
		tion (collectionname);
		catch (Unknownhostexception e) {e.printstacktrace (); } catch (Mongoexception e) {e.printstacktrace ();
	return Coll;
		}//MONGO DB Delete database public void Dropdatabase () {try {m.dropdatabase (dbname);
		catch (Mongoexception e) {e.printstacktrace ();
		}//MONGO DB query all table names public void Getallcollections () {db db = M.getdb ("MyDB");
		Set<string> colls = Db.getcollectionnames ();
		for (String s:colls) {System.out.println (s);
		}//MONGO DB Query index public void Getallindex () {list<dbobject> List = Coll.getindexinfo ();
		for (DBObject o:list) {System.out.println (o);
		}//MONGO DB inserts insert public void Insert (int i) {Basicdbobject doc = new Basicdbobject ();
		Doc.put ("name", "Liu" + i);
		Doc.put ("age", + i);
		Doc.put ("Sex", "boy");
		Doc.put ("Time", New Date ());
	Coll.insert (DOC);
		public void Batchinsert () {List datas = new ArrayList ();
			for (int i = 0; i < i++) {basicdbobject bo = new Basicdbobject ();
			Bo.put ("name", "Liu");
	Bo.append ("Age", I);		Datas.add (BO);
	} coll.insert (Datas);
		//Query single public void FindOne () {Basicdbobject obj = (basicdbobject) coll.findone ();
	System.out.println (obj);
		}//MONGO DB modifies public void update () {basicdbobject query = new Basicdbobject ();
		Query.put ("name", "Liu");
		DBObject stufound = coll.findone (query);
		Stufound.put ("Name", Stufound.get ("name") + "update_1");
	Coll.update (query, Stufound);
		//query All public void Queryall () {Basicdbobject obj = new Basicdbobject ();
		Obj.put ("Sex", "boy");
		dbcursor cursor = coll.find (obj);
			while (Cursor.hasnext ()) {String name = (String) cursor.next (). Get ("name");
		SYSTEM.OUT.PRINTLN (name);
	} cursor.close ();
		}//Condition delete public void Delete (String name) {basicdbobject query = new Basicdbobject ();
		Query.put ("name", name);
		Locate and delete, and return the deleted object DBObject removeobj = coll.findandremove (query);
	System.out.println (Removeobj); }//Conditional query public void Findbyname (String name) {Basicdbobject obj = new BasicdbobJect ();
		Obj.put ("name", name);
		dbcursor cursor = coll.find (obj);
		while (Cursor.hasnext ()) {System.out.println (Cursor.next ());
		}//Conditional query 2 public void Argsfind () {Basicdbobject condition = new Basicdbobject (); 
		Condition.put ("Age", New Basicdbobject ("$gt"), Append ("$lte", 30));
		Condition.put ("Age", New Basicdbobject ("$gt", 50));
		Coll.find (condition);
	Comparer//"$GT": Greater Than//"$gte": Greater Than//"$LT": Less Than//"$lte": Less Than//"$in": included///below Query 20<age<=30}//Paging query
		public void Pagequery () {dbcursor cursor = Coll.find (). Skip (0). Limit (10);
		while (Cursor.hasnext ()) {System.out.println (Cursor.next ());
 }
	}
}