01
@Test
02
    public void testAnd(){
03
        //agender='female' AND age > 27 
04
        DBObject queryCondition = new BasicDBObject();
05
        queryCondition.put("agender", "female");
06
        queryCondition.put("age", new BasicDBObject("$gt", 27));
07
        DBCursor dbCursor = coll.find(queryCondition);
08
        assertEquals(1, dbCursor.size());
09
        assertEquals("Jane", dbCursor.next().get("username"));
10
    }

2 单个字段的OR操作


01
@Test
02
    public void testOrSingleField(){
03
        DBObject queryCondition = new BasicDBObject();     
04
        //age<15 OR age>27
05
        queryCondition = new BasicDBObject();
06
        BasicDBList values = new BasicDBList();
07
        values.add(new BasicDBObject("age", new BasicDBObject("$gt", 27)));
08
        values.add(new BasicDBObject("age", new BasicDBObject("$lt", 15)));
09
        queryCondition.put("$or", values);
10
         
11
        DBCursor dbCursor = coll.find(queryCondition);
12
        assertEquals(3, dbCursor.size());
13
        assertEquals("tom", dbCursor.next().get("username"));
14
    }
3 多个字段的OR操作



01
@Test
02
    public void testOrMultiFields(){
03
        DBObject queryCondition = new BasicDBObject();     
04
        //agender=female OR age<=23
05
        queryCondition = new BasicDBObject();
06
        BasicDBList values = new BasicDBList();
07
        values.add(new BasicDBObject("agender", "female"));
08
        values.add(new BasicDBObject("age", new BasicDBObject("$lte", 23)));
09
        queryCondition.put("$or", values);
10
         
11
        DBCursor dbCursor = coll.find(queryCondition);
12
        assertEquals(4, dbCursor.size());
13
        assertEquals("Jim", dbCursor.next().get("username"));
14
    }
4 IN操作 


01
@Test
02
    public void testIn(){
03
        DBObject queryCondition = new BasicDBObject();     
04
        //age in [13, 47]
05
        queryCondition = new BasicDBObject();
06
        BasicDBList values = new BasicDBList();
07
        values.add(13);
08
        values.add(47);
09
        queryCondition.put("age", new BasicDBObject("$in", values));
10
         
11
        DBCursor dbCursor = coll.find(queryCondition);
12
        assertEquals(2, dbCursor.size());
13
        assertEquals("tom", dbCursor.next().get("username"));
14
    }
5 查询 name <> "li" and age >= 18的数据 


1
BasicDBObject query = new BasicDBObject();
2
query.put("name", new BasicDBObject().append("$ne", "liguohui"));
3
query.put("age", new BasicDBObject().append("$gte", 18));
4
coll.find(query)
6 查询 age> 10 and age<= 30的数据 


1
BasicDBObject query = new BasicDBObject();
2
query.put("age", new BasicDBObject().append("$gt", 10));
3
query.put("age", new BasicDBObject().append("$lte", 30));
4
coll.find(query);
7 查询 age in (20,22,24)的数据 


1
BasicDBObject query = new BasicDBObject();
2
BasicDBList values = new BasicDBList(); 
3
values.add(20); 
4
values.add(22);
5
values.add(24);
6
query.put("age", new BasicDBObject("$in", values)); 
7
DBCursor cur = coll.find(query);
8 以年龄升序asc 


1
DBCursor cur = coll.find().sort(new BasicDBObject().append("name", 1));
9 以年龄降序desc 

1
DBCursor cur = coll.find().sort(new BasicDBObject().append("name", -1));
10 查询记录条数count() 


1
BasicDBObject query = new BasicDBObject();
2
query.put("age", new BasicDBObject("$lge", 10)); 
3
long count = coll.getCount(query);
11

01
public boolean fileExistByUserId(String md5, Integer userId) {
02
        boolean isExist = false;
03
        try {
04
            db = MongoDBConnection.getDB();
05
            dbColleciton = db.getCollection("fileInfoCollection");
06
            BasicDBObject query = new BasicDBObject();
07
            query.put("fileMD5", md5);
08
            query.put("userId", userId);
09
            BasicDBList dbList = new BasicDBList();
10
            dbList.add(0);
11
            dbList.add(4);
12
            dbList.add(FileInfoModelExtra.USERPRIVATE);
13
            query.put("fileStatus", new BasicDBObject("$in", dbList)); 
14
            DBCursor cursor = dbColleciton.find(query);        
15
            if (cursor != null) {
16
                // isExist = cursor.count() > 0   true : false;
17
                isExist = cursor.iterator().hasNext()   true : false;
18
            }
19
             
20
        } catch (MongoException e) {
21
            logger.info(e);
22
        } catch (RuntimeException e) {
23
            logger.info(e.getMessage());
24
        } catch (Exception e) {
25
            logger.info(e.getMessage());
26
        }
27
        return isExist;
28
    }