The MongoDB underlying Java Driver Framework tool class uses

Using MONGODB requires a reasonable design of the document structure to meet certain specific requirements. For example, randomly selecting a document, skipping a random document with Skip and not adding a random key to the document.

Then use a random number to query the document efficiently, the random key can also add indexes, more efficient. Reasonable choice, reasonable design.

Import Java.net.unknownhostexception;import java.util.date;import java.util.list;import com.mongodb.BasicDBList; 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;import com.nerd.mongo.config.configfactory;/** * MONGOS * @author Chenlongquan * */public class Mongoutil {private final static T hreadlocal<mongo> MONGOs = new threadlocal<mongo> ();p ublic static DB Getdb () {return Getmongos (). GETDB ( Configfactory.getmongoconfig (). GETDB ());} public static Mongo Getmongos () {Mongo Mongo = Mongos.get (), if (Mongo = = null) {try {Mongo = new Mongo (CONFIGFACTORY.GETMO Ngoconfig (). GetIP (), Configfactory.getmongoconfig (). Getport ()); Mongos.set (MONGO);} catch (Unknownhostexception e) {e.printstacktrace ();} catch (Mongoexception e) {e.printstacktrace ()}} return MONGO;} public static void Close () {Mongo Mongo = Mongos.get (); if (mongo!=null) {Mongo.close (); Mongos.remove ();}} /** * Get collection (table) * * @param collection */public static Dbcollection GetCollection (String collection) {return Getdb (). Getcoll Ection (collection);} ......................................................

Below, we can perform basic CRUD operations on MongoDB based on this

For example:

/** * Insert *  * @param collection * @param o insert *     */public static void Insert (String collection, DBObject o) {getcoll Ection (collection). Insert (o);} /** * BULK INSERT *  * @param collection * @param list *            insert */public void Insertbatch (String collection, List<dbobje Ct> list) {if (list = = NULL | | list.isempty ()) {return;} GetCollection (collection). Insert (list);}

Test Case:

Insert ("user1", New Basicdbobject (). Append ("name", "Admin3"). Append ("type", "2"). Append ("Score"). Append ("Level" , 2). Append ("Inputtime", New Date (). GetTime ()));

Tool class use:

/** * Delete * * @param collection * @param q * Query condition */public void Delete (String collection, DBObject q) {Getcolle Ction (collection). Remove (q); /** * Bulk Delete * * @param collection * @param list * Delete Condition list */public void Deletebatch (String collection, list<d Bobject> list) {if (list = = NULL | | list.isempty ()) {return;} for (int i = 0; i < list.size (); i++) {GetCollection (collection). Remove (List.get (i));}} /** * UPDATE * * @param collection * @param q * Query conditions * @param setfields * Update object */public static void upd Ate (String collection, DBObject Q, DBObject setfields) {GetCollection (collection). Updatemulti (Q,new basicdbobject ("$ Set ", Setfields));} /** * Find Collection all objects * * @param collection */public static list<dbobject> FindAll (String collection) {return getcollectio N (Collection). Find (). ToArray ();} /** * Find collection all objects sequentially * @param collection * DataSet * @param ORDER BY * sort */public static List<dbobjec T> FindAll (String collection, DbobjecT) {return GetCollection (collection). Find (). sort (by). ToArray ();} /** * FIND (return an object) * * @param collection * @param q * Query conditions */public static DBObject FindOne (String collection, D Bobject q) {return GetCollection (collection). FindOne (q);} /** * FIND (return an object) * * @param collection * @param q * Query condition * @param fileds * return field */public static DBO Bject FindOne (String collection, DBObject Q, DBObject fileds) {return GetCollection (collection). FindOne (q, fileds);} /** * Page Find collection object, return specific fields * * @param collection * @param q * Query condition * @param fileds * return field * @pageNo page n * @perPageCount number of records per page */public static list<dbobject> findless (String collection, DBObject Q, dbobject fileds, int pa Geno,int perpagecount) {return GetCollection (collection). Find (q, fileds). Skip ((pageNo-1) * perpagecount). Limit ( Perpagecount). ToArray ();}

The MongoDB underlying Java Driver Framework tool class uses