DBCollection dbcon = null;
DBObject query = new BasicDBObject();
BasicDBList values = new BasicDBList();
// or使用方法 --->> 查询薪水salary<3000 or salary>10000
values.add(new BasicDBObject("salary", new BasicDBObject("$gt", 10000)));
values.add(new BasicDBObject("salary", new BasicDBObject("$lt", 3000)));
query.put("$or", values);
DBCursor dbCursor = dbcon.find(query);
// end///
//查询 salary>1000 or age<22
values.add(new BasicDBObject("salary", new BasicDBObject("$gt", 10000)));
values.add(new BasicDBObject("age", new BasicDBObject("$lte", 22)));
query.put("$or", values);
DBCursor dbCursor2 = dbcon.find(query);
//end///
// in使用方法 --->> 查询 salary in [13, 47]
values.add(3000);
values.add(10000);
query.put("salary", new BasicDBObject("$in", values));
DBCursor dbCursor3 = dbcon.find(query);
//and使用方法 --->> salary>10000 and age<22
query.put("salary", new BasicDBObject("$gt", 10000));
query.put("age", new BasicDBObject("$lt", 22));
DBCursor dbCursor4 = dbcon.find(query);