Java实现对MongoDB的AND、OR和IN操作

很全的JAVA操作mongodb：

http://www.blogjava.net/xiaomage234/archive/2012/08/06/384904.html

 

转的：

 

AND:

public void testAnd(){
//agender='female' AND age > 27
DBObject queryCondition = new BasicDBObject();
queryCondition.put("agender", "female");
queryCondition.put("age", new BasicDBObject("$gt", 27));
DBCursor dbCursor = coll.find(queryCondition);
assertEquals(1, dbCursor.size());
assertEquals("Jane", dbCursor.next().get("username"));
}

OR:
public void testOrSingleField(){
DBObject queryCondition = new BasicDBObject();
//age<15 OR age>27
queryCondition = new BasicDBObject();
BasicDBList values = new BasicDBList();
values.add(new BasicDBObject("age", new BasicDBObject("$gt", 27)));
values.add(new BasicDBObject("age", new BasicDBObject("$lt", 15)));
queryCondition.put("$or", values);

DBCursor dbCursor = coll.find(queryCondition);
assertEquals(3, dbCursor.size());
assertEquals("tom", dbCursor.next().get("username"));
} OR:

public void testOrMultiFields(){
DBObject queryCondition = new BasicDBObject();
//agender=female OR age<=23
queryCondition = new BasicDBObject();
BasicDBList values = new BasicDBList();
values.add(new BasicDBObject("agender", "female"));
values.add(new BasicDBObject("age", new BasicDBObject("$lte", 23)));
queryCondition.put("$or", values);

DBCursor dbCursor = coll.find(queryCondition);
assertEquals(4, dbCursor.size());
assertEquals("Jim", dbCursor.next().get("username"));
}

in:
public void testIn(){
DBObject queryCondition = new BasicDBObject();
//age in [13, 47]
queryCondition = new BasicDBObject();
BasicDBList values = new BasicDBList();
values.add(13);
values.add(47);
queryCondition.put("age", new BasicDBObject("$in", values));

DBCursor dbCursor = coll.find(queryCondition);
assertEquals(2, dbCursor.size());
assertEquals("tom", dbCursor.next().get("username"));
}