The "MongoDB"-java implements the and, or, in operation of MongoDB

1) and (with and when multiple conditions are met)

publicvoidtestAnd(){          new BasicDBObject();        //agender=‘female‘ AND age > 27        queryCondition.put("agender""female");        queryCondition.put("age"new BasicDBObject("$gt"27));        DBCursor dbCursor = coll.find(queryCondition);       }    

2) Or (two conditions satisfy one of them)

 Public void Testorsinglefield() {DBObject querycondition =NewBasicdbobject ();//age<15 OR age>27Basicdblist values =NewBasicdblist (); Values.add (NewBasicdbobject ("Age",NewBasicdbobject ("$GT", -))); Values.add (NewBasicdbobject ("Age",NewBasicdbobject ("$lt", the))); Querycondition.put ("$or", values);       Dbcursor dbcursor = Coll.find (querycondition); }

3) in (requires the value of a field in a range)

publicvoidtestIn(){        new BasicDBObject();              //age in [13, 47]        new BasicDBList();        values.add(13);        values.add(47);        queryCondition.put("age"new BasicDBObject("$in", values));        DBCursor dbCursor = coll.find(queryCondition);       }    

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The "MongoDB"-java implements the and, or, in operation of MongoDB