MongoDB数据类型

对象ID：

ObjectId id = new ObjectId();
ObjectId copy = new ObjectId(id);

正则表达式：

Pattern john = Pattern.compile("joh?n", CASE_INSENSITIVE);
BasicDBObject query = new BasicDBObject("name", john);

// finds all people with "name" matching /joh?n/i
DBCursor cursor = collection.find(query);

数据库引用：

DBRef addressRef = new DBRef(db, "foo.bar", address_id);
DBObject address = addressRef.fetch();

DBObject person = BasicDBObjectBuilder.start()
    .add("name", "Fred")
    .add("address", addressRef)
    .get();
collection.save(person);

DBObject fred = collection.findOne();
DBRef addressObj = (DBRef)fred.get("address");
addressObj.fetch()


二进制数据：

byte[]



嵌入式文档：


{
    "x" : {
        "y" : 3
    }
}
BasicDBObject y = new BasicDBObject("y", 3);


BasicDBObject x = new BasicDBObject("x", y);

数组：
{
    "x" : [
        1,
        2,
        {"foo" : "bar"},
        4
    ]
}

ArrayList x = new ArrayList();
x.add(1);
x.add(2);
x.add(new BasicDBObject("foo", "bar"));
x.add(4);

BasicDBObject doc = new BasicDBObject("x", x);