Mongodb2.6,java use of the detailed

The environment used in this article is: Win7_64+eclipse+maven
First, the preparatory work

Download Java driver package

Drive Pack: Http://mvnrepository.com/artifact/org.mongodb/mongo-java-driver

MongoDB Download: http://www.mongodb.org/

Online api:http://docs.mongodb.org/manual/applications/drivers/

Second, installation MONGO

1.windows Installation Method:

　　To install the MONGO database:

First step: Download the installation package: If it is a win system, note whether it is a 64-bit or 32-bit version, please select the correct version.

Second step: Create a new directory "D:\MongoDB", unzip the downloaded installation package, locate all the. exe files under the bin directory, and copy to the directory you just created.

Step three: Create a new "data" folder in the "D:\MongoDB" directory, which will be the root folder for data storage.

　　Configure the MONGO service side:

Open the cmd window and enter the command as follows:
> D:
> CD D:\MongoDB
> Mongod--dbpath D:\MongoDB\data

Access from browser after successful startup: http://localhost:27017/

Indicates that MongoDB under Windows has started successfully;

2.linux Installation Method:

After download to ensure that the database directory size remaining space above 3G;

This is started with the configuration file: Create a file named: Mongodb.conf at the root of MongoDB, with the following content:

The starting mode is as follows:/mongodb2.6.3/bin/mongod-f/mongodb2.6.3/mongodb.conf
Remember to open the access port for Linux:

#vi/etc/sysconfig/iptables

YY Copy a row

P Paste

Modify Port

#service iptables Restart

Set up boot from

#echo/mongodb2.6.3/bin/mongod-f/mongodb2.6.3/mongodb.config >>/etc/rc.local

The database starts, and then the database and the collection are created:

MONGO--port 8888

> Show DBS
Admin (empty)
Local 0.078GB
> Use admin(switch administrative users)
Switched to DB admin
> Db.mymongo(CREATE DATABASE)
Admin.mymongo
> Db.adduser ("Root", "root")(add users)
Warning:the ' AddUser ' shell Helper is DEPRECATED. Please use ' createUser ' instead
Successfully added User: {"user": "Root", "roles": ["Root"]}
> Db.auth ("Root", "root")(add login user)
1
> db.createcollection ("T_users")(add table)
{"OK": 1}
> Show Collections(show table)
System.indexes
System.users
System.version
T_users
> Db.t_users.save ({age:21})(store data)
Writeresult ({"ninserted": 1})
> Db.t_users.find ()(query all data)
{"_id": ObjectId ("53a2e45e4a674863b4ac5398"), "Age": 21}

MongoDB Delete Database

Use Mymongo;

Db.dropdatabase ();

MongoDB Delete Table

Db.t_users.drop ();

MongoDB Service stopped:
In Linux everyone stop a lot of services like Direct kill-9 PID, but for MongoDB if the kill-9 PID, the next boot may prompt error, cause the service cannot start, this time can be executed by:

Java code

1. Rm-f/app/hadoop/db/mongod.lock

You can also delete the Mongod.lock file under the specified data directory.

Normal Stop method:
Kill-2 PID
Or
Java code

1. ./mongo-host Ip:port

First connect the services that need to be stopped, and then:
Java code

1. >use Admin
2. >db.shutdownserver ();

This can also stop the service as normal.

Iii. Java Operation MongoDB Example

1, establish Test.java, complete the simple MongoDB database operation

try {Mongo mg = new Mongoclient ("192.168.186.129", 8888);D b DB = Mg.getdb ("Mymongo");//used to determine user login//if ( !db.authenticate ("Sdap", "sdap123". ToCharArray ())) {//method has not been recommended for use with//}set<string> Collectionnames = Db.getcollectionnames (); for (string string:collectionnames) {System.out.println (string);} Dbcollection Collection2 = db.getcollection ("t_users2"); Collection2 = Db.getcollection ("T_users2"); Carpasitionobj u = new Carpasitionobj (); U.setla (1231d); U.setlo (42342d); U.SETPN ("Beijing 1aaa"); U.settp (12); String Obj2json = Jsonutils.getsingletoninstance (). Obj2json (U); Basicdbobject dbobject1=new basicdbobject ();d bobject1.put ("Key", "123131");d bobject1.put ("value", Obj2json); Collection2.save (DbObject1); <pre name= "code" class= "java" >basicdbobject dbobject=new Basicdbobject (); Dbobject.put ("Key", "123131");D bcursor find = Collection2.find (DBObject), while (Find.hasnext ()) {DBObject next = Find.next (); String key = (string) next.get ("key"); String json = (string) next.get ("value"); System.OUT.PRINTLN (key); Carpasitionobj Formjson = Jsonutils.getsingletoninstance (). Formjson (JSON, carpasitionobj.class); System.out.println (FORMJSON.GETPN ());}} catch (unknownhostexception e) {            e.printstacktrace ();                     }

The following is a tool class that stickers my own MongoDB:

/** * Project Name:main * File Name:MongodbCacheManagerUtil.java * Package Name:com.hdsx.taxi.driver.cq.cache * date:2014 April 9 pm 12:49:55 * Copyright (c), Sid Jenkins All rights Reserved. * **/package com.hdsx.taxi.driver.cq.mongodb;import Java.net.unknownhostexception;import java.util.ArrayList; Import Java.util.list;import Org.apache.log4j.logger;import com.hdsx.taxi.driver.cq.module.InitServletModule; Import Com.hdsx.taxi.driver.cq.tcp.util.jsonutils;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.mongoclient;/** * Classname:mongodbcachemanagerutil * Function:todo ADD Function.  * Reason:todo ADD Reason. * date:2014 April 9 pm 12:49:55 * @author SID * @see */public class Mongodbmanagerutil {private static final Logger Logger = Logger.getlogger (mongodbmanagerutil.class);p rivate Mongo mg = null;private db db = null;private volatile statIC Mongodbmanagerutil singleton = null;public static final string key = "KEY";p ublic static final String value = "VALUE";p Ublic static Mongodbmanagerutil getsingletoninstance () {if (singleton = = null) {synchronized (Mongodbmanagerutil.class) {if (singleton = = null) {singleton = new Mongodbmanagerutil ();}} Singleton = new Mongodbmanagerutil ();} return singleton;} Private Mongodbmanagerutil () {if (logger.isdebugenabled ()) {Logger.debug ("Mongodbcachemanagerutil ()-start"); $NON-nls-1$}try {mg = new Mongoclient ("192.168.186.129", 8888);d B = Mg.getdb ("Mymongo");} catch (Unknownhostexception e) {e.printstacktrace ();} if (logger.isdebugenabled ()) {Logger.debug ("mongodbcachemanagerutil ()-end");//$NON-nls-1$}}/** * * GetCache: (Get Cache object  ). * * @author SID * @param name * @return */public dbcollection getcache (String name) {return this.db.getCollection (name);}  /** * Put: (add the object that needs to be cached in the specified cache object). * * @author SID * @param cachename * @param key * @param value */public void put (String cachename,String key, Object value) {dbcollection cache = this.db.getCollection (cachename); String Obj2json = Jsonutils.getsingletoninstance (). Obj2json (value); Basicdbobject obj = new Basicdbobject (); Obj.put (Mongodbmanagerutil.key, KEY); Obj.put (Mongodbmanagerutil.value,        Obj2json);        Basicdbobject basicdbobject = new Basicdbobject (Mongodbmanagerutil.key, KEY);        int size = Cache.find (basicdbobject). Count (); if (size==0) {cache.save (obj);}    else{cache.update (basicdbobject, obj);}      }/** * Get: (Gets the object from the specified cache object based on key). * * @author SID * @param cachename * @param key * @return */public <T> T get (String Cachenam         E, String key, class<t> classoft) {dbcollection cache = this.db.getCollection (cachename);        list<dbobject> array = cache.find (new Basicdbobject (Mongodbmanagerutil.key, KEY)). ToArray (); if (array = = null| |        Array.size () ==0) {return null;}      DBObject dbobject = array.get (0);  String json = (string) dbobject.get (Mongodbmanagerutil.value);     Return Jsonutils.getsingletoninstance (). Formjson (JSON, classoft);      }/** * Remove: (Clears objects from the specified cache object).        * * @author SID * @param cachename * @param key */public void Remove (string cachename, string key) {        Dbcollection cache = this.db.getCollection (cachename);    Cache.remove (New Basicdbobject (Mongodbmanagerutil.key,key));      }/** * * Getkeys: (Get the Keys list). * * @author SID * @param cachename * @return */public list<string> getkeys (String cachename) {list&lt ;        string> list = new arraylist<string> ();        Dbcollection cache = this.db.getCollection (cachename);        Dbcursor find = Cache.find ();        while (Find.hasnext ()) {DBObject next = Find.next ();        String key = (string) next.get (Mongodbmanagerutil.key);        List.add (key);}    return list;  }/** * * ContainsKey: (determines whether the message exists). * * @Author SID * @param cachename * @param key * @return */public Boolean containskey (String cachename,string key) {DBC        Ollection cache = this.db.getCollection (cachename);        Basicdbobject basicdbobject = new Basicdbobject (Mongodbmanagerutil.key, KEY);        int size = Cache.find (basicdbobject). Count (); if (size==0) {return false;} Else{return true;}}}

In addition to save, insert, UPDATE;MONGODB, and remove operations

Where the Find method can specify the query criteria:

Greater than or equal to: $gte

Less than or equal to: $lte

Not equal to: $ne

Demo:users.find (New Basicdbobject ("Age", New Basicdbobject ("$gte", 24)))