Mongo java 客户端API学习
查询
类:DBCollection
方法:
DBCursor find();
Queries for all objects in this collection(查询集合中所有的对象)
DBCursor find(DBObject query)(查询满足指定条件的对象)
DBCursor find(DBObject query,DBObject keys)(查询满足指定条件的对象,并指定结果所需的keys)
sample:
DBCursor cursor = collection.find( query );
if( cursor.hasNext() )
DBObject obj = cursor.next();
Interface DBObject
常用的实现类:BasicDBList, BasicDBObject, CommandResult