mongodb java經常使用操做記錄

 

根據條件刪除嵌套文檔中某個文檔
DBObject queryObject = new BasicDBObject();
queryObject.put("question","幫得佳淨亮洗潔精（濃縮型）及補充裝多少錢");
DBObject innerDbObject = new BasicDBObject();
innerDbObject.put("title", "302 Found");
BasicDBObject updateObject = new BasicDBObject().append("$pull", new BasicDBObject().append("similarList",innerDbObject));
WriteResult result = baiduCollection.updateMulti(queryObject, updateObject);

模糊查詢

Pattern pattern = Pattern.compile("^.*" + "404"+ ".*$", Pattern.CASE_INSENSITIVE); 
        DBObject queryObject = new BasicDBObject();
        queryObject.put("similarList.title", pattern);
        DBCursor cursor = baiduCollection.find(queryObject).limit(10);
        while (cursor.hasNext()) {
            DBObject dbObject = cursor.next();
            System.out.println(dbObject);
        }


模糊更新子文檔

Pattern pattern = Pattern.compile("^.*" + "Suspended Domain"+ ".*$", Pattern.CASE_INSENSITIVE);//404 403 302
         
        DBObject queryObject = new BasicDBObject();
        DBObject innerDbObject = new BasicDBObject();
        innerDbObject.put("title", pattern);
         
         
         
        BasicDBObject updateObject = new BasicDBObject().append("$pull", new BasicDBObject().append("similarList",innerDbObject));
        WriteResult result = baiduCollection.updateMulti(queryObject, updateObject);
        System.out.println(result);