MongoDB crud Operations (Java Util)

1. Save Insert Operation:

 Public Static synchronized String Insert (DBObject record) {        = mongodb.getdbcollection (table_name);        Record.put (new  Date (). GetTime ());         = Col.insert (record);         // _ID of the currently inserted table        return record.get ("_id"). toString ();   }

Note: After the Col.insert (record) execution succeeds, the record can get _id by Record.get ("_id") whether it is empty to determine if the save is empty!

2, update the editing operation:

 Public Static synchronized intedit (DBObject record) {dbcollection col=mongodb.getdbcollection (table_name); //Check if there is a corresponding obj_id presenceBasicdbobject queryobj =NewBasicdbobject (); Queryobj.put ("_id", Record.get ("_id")); Dbcursor DC=Col.find (queryobj); if(Dc.count () < 1) {            returnno_record_exist; }         //Save DataRecord.removefield ("_id"); Writeresult result= Col.update (Queryobj,NewBasicdbobject ("$set", record)); returnResult.getn (); }

Note: Before updating the data to be updated in the data _id removed otherwise error, Queryobj is updated query conditions, record is updated records, can not contain _id in the record ...

3. Delete operation:

 Public Static synchronized intdel (dbobject record, olacloudcontent olacloudcontent) {dbcollection col=mongodb.getdbcollection (table_name); //Check if there is a corresponding obj_id presenceDbcursor DC =Col.find (record); if(Dc.count () < 1) {            returnno_record_exist; }//Delete DataWriteresult result =Col.remove (record); Oplog.addoplog (Olacloudcontent.getusername (), TABLE_NAME,"Del_key", record.tostring ()); returnResult.getn (); }    

4. Query operation:

 Public Static synchronizedCorpusanswerwrap Find (dbobject record,dbobject sort,intlimit) {Corpusanswerwrap Answerwrap=NewCorpusanswerwrap (); List<AnswerEntity> answerlist =NewArraylist<answerentity>(); Dbcollection Col=mongodb.getdbcollection (table_name); Dbcursor DC=Col.find (record). Sort (sort); if(Limit > 0) {dc.limit (limit);        } answerwrap.settotalcount (Dc.count ());  while(Dc.hasnext ()) {answerentity entity= Answerwrap.Newanswerentity ();            Entity.setrecord (Dc.next ());        Answerlist.add (entity); } answerwrap.setdatas (Answerlist.toarray (Newanswerentity[answerlist.size ()]); returnAnswerwrap; }

MongoDB crud Operations (Java Util)