A simple MongoDB operation class

Import java.net. unknownhostexception; import Java. util. map; import Java. util. concurrent. concurrenthashmap; import Org. slf4j. logger; import Org. slf4j. loggerfactory; 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. writeresult; import COM. mongoDB. util. JSON;/*** MongoDB operations Class * @ author DYK **/public class mongodbmanagerimpl implements mongodbmanager {protected static logger = loggerfactory. getlogger ("03046"); Private Static final string dbname = "Clementine"; private Mongo = NULL; private dB dbconnection = NULL; private string implements serveraddr; private int implements SERVERPORT; private Static Map <string, dbcollection> dbcollectionmap = new concurrenthashmap <string, Dbcollection> (); Public void setincluserveraddr (string incluserveraddr) {This. protected serveraddr = protected serveraddr;} public void setprotected SERVERPORT (INT protected SERVERPORT) {This. export SERVERPORT = export SERVERPORT;} public void Init () {If (this. mongo = NULL) {try {This. mongo = new Mongo (this. mongoserveraddr, this. mongoserverport); If (null! = This. mongo) {This. dbconnection = This. mongo. getdb (dbname) ;}} catch (unknownhostexception e) {logger. error ("failed to connect to MongoDB, server address:" + this. mongoserveraddr + ", Port:" + this. mongoserverport); throw new runtimeexception (e) ;}}/ *** get an table * @ Param collectionname * @ return */private dbcollection getdbcollection (string collectionname) {dbcollection collection = NULL; If (dbcollectionmap. containskey (Collectionname) {collection = dbcollectionmap. Get (collectionname);} else {collection = This. dbconnection. getcollection (collectionname); If (null! = Collection) {dbcollectionmap. put (collectionname, Collection) ;}} return collection ;} /*** check if Doc exsit * @ Param collectionname table name * @ Param query target document */@ overridepublic Boolean isincluentexsit (string collectionname, dbobject query) {boolean result = false; dbcursor = NULL; dbcollection collection = This. getdbcollection (collectionname); If (null! = Collection) {dbcursor = collection. Find (query); If (null! = Dbcursor & dbcursor. hasnext () {result = true;} return result ;} /*** query an record * @ Param collectionname table name * @ Param query target document * @ return */@ overridepublic dbobject selectdocument (string collectionname, dbobject query) {dbobject result = NULL; dbcursor = NULL; dbcollection collection = This. getdbcollection (collectionname); If (null! = Collection) {dbcursor = collection. Find (query); If (null! = Dbcursor & dbcursor. hasnext () {result = dbcursor. next () ;}} return result ;} /*** insert an new record * @ Param collectionname table name * @ Param newdocument New Doc * @ Param query target document */@ overridepublic void insertdocument (string collectionname, dbobject newdocument) {dbcollection collection = This. getdbcollection (collectionname); If (null! = Collection) {If (! This. isdocumentexsit (collectionname, newdocument) {// insert only doc not exist collection. insert (newdocument );}}} /*** update an document * @ Param collectionname * @ Param query target document * @ Param updateddocument * @ return */@ overridepublic Boolean updatedocument (string collectionname, dbobject query, dbobject updateddocument) {boolean result = false; writeresult = NULL; dbcollectio N collection = This. getdbcollection (collectionname); If (null! = Collection) {writeresult = collection. Update (query, updateddocument); If (null! = Writeresult) {If (writeresult. getn ()> 0) {result = true ;}} return result ;} /*** delete an document * @ Param collectionname * @ Param document target document * @ return */@ overridepublic Boolean deletedocument (string collectionname, dbobject query) {boolean result = false; writeresult = NULL; dbcollection collection = This. getdbcollection (collectionname); If (null! = Collection) {writeresult = collection. Remove (query); If (null! = Writeresult) {If (writeresult. getn ()> 0) {result = true ;}} return result;} public static void main (string [] ARGs) throws unknownhostexception {mongodbmanagerimpl M = new mongodbmanagerimpl (); m. setmongoserveraddr ("10.235.164.180"); M. setmediaserverport (27017); M. init (); string collectionname = "mytest"; // insertstring JSON = "{'num': 1}"; dbobject doc1 = (dbobject) JSON. parse (JSON); M. insertdocument (collectionname, doc1); // selectdbobject doc2 = NULL; dbobject query = new basicdbobject (); query. put ("num", 1); doc2 = m. selectdocument (collectionname, query); system. out. println (doc2); // updatedbobject updateddocument = new basicdbobject (); updateddocument. put ("$ set", new basicdbobject (). append ("num", 100); boolean result = m. updatedocument (collectionname, query, updateddocument); system. out. println (result); query. put ("num", 100); // removeresult = m. deletedocument (collectionname, query); system. out. println (result );}}