MongoDB的CRUD操作（java Util ）

標籤：

1、儲存插入操作：

public static synchronized String insert(DBObject record) {        DBCollection col = MongoDB.getDBCollection(TABLE_NAME);        record.put("time", new Date().getTime());        WriteResult result = col.insert(record);        //當前插入表的_id        return record.get("_id").toString();   }

注意：col.insert(record)執行成功後 record可以擷取_id 可以通過 record.get("_id")是否為空白判斷儲存是否為空白!

 

2、更新編輯操作：

public static synchronized int edit(DBObject record) {        DBCollection col = MongoDB.getDBCollection(TABLE_NAME);        // 檢查是否有對應的obj_id存在        BasicDBObject queryObj = new BasicDBObject();        queryObj.put("_id", record.get("_id"));        DBCursor dc = col.find(queryObj);        if (dc.count() < 1) {            return NO_RECORD_EXIST;        }         // 儲存資料        record.removeField("_id");        WriteResult result = col.update(queryObj, new BasicDBObject("$set", record));        return result.getN();    }

注意：在更新資料前要將被更新的資料中_id移除掉 否則報錯，queryObj是更新的查詢條件，record是更新的記錄，record中不能包含_id...

 

3、刪除操作：

public static synchronized int del(DBObject record, OlaCloudContent olaCloudContent) {        DBCollection col = MongoDB.getDBCollection(TABLE_NAME);        // 檢查是否有對應的obj_id存在        DBCursor dc = col.find(record);        if (dc.count() < 1) {            return NO_RECORD_EXIST;        }// 刪除資料        WriteResult result = col.remove(record);        OpLog.AddOpLog(olaCloudContent.getUserName(), TABLE_NAME, "del_key", record.toString());        return result.getN();    }    

 

4、查詢操作：

public static synchronized CorpusAnswerWrap find(DBObject record,DBObject sort,int limit){        CorpusAnswerWrap answerWrap = new CorpusAnswerWrap();        List<AnswerEntity> answerList = new ArrayList<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.new AnswerEntity();            entity.setRecord(dc.next());            answerList.add(entity);        }        answerWrap.setDatas(answerList.toArray(new AnswerEntity[answerList.size()]));        return answerWrap;    }

 

MongoDB的CRUD操作（java Util ）