mongooDb链接javaapi

mongodb链接有多种；所以不同链接下的api也不太一样。

1、api比较全面

    public void query2(){ 
        String mondburl = Config.getInstance().getProperty("mongodb.host");
        MongoClientOptions options = new MongoClientOptions.Builder().socketKeepAlive(true).build();
        Mongo  client = new MongoClient(mondburl,  options);
        DB database = client.getDB("pnr");
        DBCollection coll = database.getCollection("b_dep_pnr_flt_test");
        
        DBObject keys = new BasicDBObject();
//条件
        DBObject dbObject = new BasicDBObject();
        dbObject.put("alnCd",  "CZ"); 
        dbObject.put("fltNr",  "3452"); 
        dbObject.put("fltDt",  "20180425000000"); 
        dbObject.put("arvCd",  "SZX");
        dbObject.put("depCd",  "LJG");
        
        DBObject initial = new BasicDBObject("dcsTimestamp", "0");
        String reduce = "function(doc,prev){" +
                "var docDcsTimestamp=doc.dcsTimestamp;" +
                "var prevDcsTimestamp=prev.dcsTimestamp;" +
                "var docDcsTimestampInt=parseInt(docDcsTimestamp);" +
                "var prevDcsTimestampInt=parseInt(prevDcsTimestamp);" +
                "if(docDcsTimestampInt > prevDcsTimestampInt){" +
                "prev.fltNr=doc.fltNr;" +
                "prev.fltDt=doc.fltDt;" +
                "prev.dcsTimestamp=doc.dcsTimestamp;}" +
                "}";
        BasicDBList dbList = (BasicDBList) coll.group(keys, dbObject, initial, reduce);
        //Iterator<Object> iterator = dbList.iterator();
//        for (Object object : dbList) {
//            System.out.println(((DBObject)object).toString());
//        }
        
       
        for (Object object : dbList) {
           BasicDBObject a  = (BasicDBObject) object;
           System.out.println(a.get("fltNr"));
        }

    }
    

2、api不够全的链接

    public static MongoClient mongoClient;
    public static Mongo mongo;
    private Object object;
    
    
    
    public static MongoClient connect() {
        String mondburl = Config.getInstance().getProperty("mongodb.host");
        MongoClientOptions options = new MongoClientOptions.Builder().socketKeepAlive(true).build();
        if(mongoClient == null) {
            mongoClient = new MongoClient(mondburl,  options);
        }
        return mongoClient;
    }

 3、springboot的mongoDb链接