Nosql Mongodb之旅(8)—MongoDB高级查询の游标使用

像大多数数据库产品一样，MongoDB 也是用游标来循环处理每一条结果数据，具体语法如

下：

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1. >for(varc=db.t3.find();c.hasNext();){
2. printjson(c.next());
3. }
4. {"_id":ObjectId("4fb8e4838b2cb86417c9423a"),"age":1}
5. {"_id":ObjectId("4fb8e4878b2cb86417c9423b"),"age":2}
6. {"_id":ObjectId("4fb8e4898b2cb86417c9423c"),"age":3}
7. {"_id":ObjectId("4fb8e48c8b2cb86417c9423d"),"age":4}
8. {"_id":ObjectId("4fb8e48e8b2cb86417c9423e"),"age":5}

MongoDB 还有另一种方式来处理游标

1. >db.t3.find().forEach(function(u){printjson(u);});
2. {"_id":ObjectId("4fb8e4838b2cb86417c9423a"),"age":1}
3. {"_id":ObjectId("4fb8e4878b2cb86417c9423b"),"age":2}
4. {"_id":ObjectId("4fb8e4898b2cb86417c9423c"),"age":3}
5. {"_id":ObjectId("4fb8e48c8b2cb86417c9423d"),"age":4}
6. {"_id":ObjectId("4fb8e48e8b2cb86417c9423e"),"age":5}
7. >