mongodb如何对子文档进行分页

文档结构如下：

<code>{
    "_id" : ObjectId("55dc145ef754a3342000002d"),
    "id" : 12,
    "title" : "炎炎夏日，跟我一起High翻天！",
    "content" : "酷暑7月，简直不能忍~~~！夏天。就应该是被西瓜，冰镇可乐，全家桶，空调和游戏包围着的天堂。外面的世界纷纷扰扰与我无关~~哇哈哈哈！！",
    "thumb" : "/201506/5592560017b6a.jpg",
    "banner" : "/201506/559255fa5366d.jpg",
    "order" : 11,
    "publish_time" : "2015-08-25",
    "game_num" : 14,
    "games" : [ 
        {
            "id" : 1128,
            "name_zh" : "追击野兽",
            "apk_size" : "38.15M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "com.miniclip.beastquest",
            "apk_version_code" : "18",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-18 00:00:00",
        }, 
        {
            "id" : 3276,
            "name_zh" : "世界僵尸大联盟",
            "apk_size" : "33.88M",
            "apk_version_name" : "3.3.3237",
            "apk_package_name" : "com.proletariat.worldzombination",
            "apk_version_code" : "33537",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-15 00:00:00",
        }, 
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "apk_size" : "38.69M",
            "apk_version_name" : "1.7.1",
            "apk_package_name" : "com.outplayentertainment.aliencreeps",
            "apk_version_code" : "10070010",
            "game_rank" : 8,
            "customize_update_time" : "2015-04-25 00:00:00",
        }, 
        {
            "id" : 10357,
            "name_zh" : "合金弹头：防御",
            "apk_size" : "47.13M",
            "apk_version_name" : "1.27.0",
            "apk_package_name" : "com.snkplaymore.android003",
            "apk_version_code" : "52",
            "game_rank" : 8,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10360,
            "name_zh" : "绿色忍者蛙年",
            "apk_size" : "47.7M",
            "apk_version_name" : "4",
            "apk_package_name" : "com.nitrome.greenninja",
            "apk_version_code" : "4",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 15:52:10",
        }, 
        {
            "id" : 10364,
            "name_zh" : "杀死马里奥",
            "apk_size" : "31.16M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "air.com.keybol.plumber",
            "apk_version_code" : "1000006",
            "game_rank" : 7,
            "customize_update_time" : "2015-06-30 16:08:09", 
        }, 
        {
            "id" : 10366,
            "name_zh" : "通过繁殖征服世界",
            "apk_size" : "44.83M",
            "apk_version_name" : "1.0.2",
            "apk_package_name" : "com.kt.SpermWarWorldWide_G",
            "apk_version_code" : "10002",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:21:22", 
        }, 
        {
            "id" : 10229,
            "name_zh" : "冰块切割",
            "apk_size" : "7.14M",
            "apk_version_name" : "2.4.6",
            "apk_package_name" : "com.hyperkani.sliceice",
            "apk_version_code" : "30",
            "game_rank" : 7,
            "customize_update_time" : "2014-11-04 00:00:00",
        }, 
        {
            "id" : 10356,
            "name_zh" : "吃冰淇淋的怪房子",
            "apk_size" : "33.56M",
            "apk_version_name" : "1.0.2",
            "apk_package_name" : "com.firedroid.icecreamnomsters",
            "apk_version_code" : "4",
            "game_rank" : 8,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10358,
            "name_zh" : "来杯果汁",
            "apk_size" : "42.11M",
            "apk_version_name" : "1.6.21",
            "apk_package_name" : "air.com.sgn.juicejam.gp",
            "apk_version_code" : "1006021",
            "game_rank" : 6,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10362,
            "name_zh" : "梦游先生",
            "apk_size" : "48.52M",
            "apk_version_name" : "1.00",
            "apk_package_name" : "com.BEbit.MrSnoozleberg",
            "apk_version_code" : "1",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 15:58:13",
        }, 
        {
            "id" : 10363,
            "name_zh" : "清凉方冰冰",
            "apk_size" : "23.14M",
            "apk_version_name" : "1.1",
            "apk_package_name" : "com.unilever.CoolCubeszzc",
            "apk_version_code" : "2",
            "game_rank" : 6,
            "customize_update_time" : "2015-06-30 16:04:56",
        }, 
        {
            "id" : 10365,
            "name_zh" : "嗜血狂鲨2",
            "apk_size" : "9.9M",
            "apk_version_name" : "2.6.1",
            "apk_package_name" : "com.fgol.shark2",
            "apk_version_code" : "13",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:15:58",
        }, 
        {
            "id" : 10367,
            "name_zh" : "外星人爱牛奶",
            "apk_size" : "23.86M",
            "apk_version_name" : "1.0.7",
            "apk_package_name" : "air.com.rightfusion.alienslikemilk",
            "apk_version_code" : "1000007",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:28:17",
        }
    ]
}</code>

如何对子文档games进行分页查询
比如一次只取3条数据

<code>{
            "id" : 1128,
            "name_zh" : "追击野兽",
            "apk_size" : "38.15M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "com.miniclip.beastquest",
            "apk_version_code" : "18",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-18 00:00:00",
        }, 
        {
            "id" : 3276,
            "name_zh" : "世界僵尸大联盟",
            "apk_size" : "33.88M",
            "apk_version_name" : "3.3.3237",
            "apk_package_name" : "com.proletariat.worldzombination",
            "apk_version_code" : "33537",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-15 00:00:00",
        }, 
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "apk_size" : "38.69M",
            "apk_version_name" : "1.7.1",
            "apk_package_name" : "com.outplayentertainment.aliencreeps",
            "apk_version_code" : "10070010",
            "game_rank" : 8,
            "customize_update_time" : "2015-04-25 00:00:00",
        }
}</code>

回复内容：

文档结构如下：

<code>{
    "_id" : ObjectId("55dc145ef754a3342000002d"),
    "id" : 12,
    "title" : "炎炎夏日，跟我一起High翻天！",
    "content" : "酷暑7月，简直不能忍~~~！夏天。就应该是被西瓜，冰镇可乐，全家桶，空调和游戏包围着的天堂。外面的世界纷纷扰扰与我无关~~哇哈哈哈！！",
    "thumb" : "/201506/5592560017b6a.jpg",
    "banner" : "/201506/559255fa5366d.jpg",
    "order" : 11,
    "publish_time" : "2015-08-25",
    "game_num" : 14,
    "games" : [ 
        {
            "id" : 1128,
            "name_zh" : "追击野兽",
            "apk_size" : "38.15M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "com.miniclip.beastquest",
            "apk_version_code" : "18",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-18 00:00:00",
        }, 
        {
            "id" : 3276,
            "name_zh" : "世界僵尸大联盟",
            "apk_size" : "33.88M",
            "apk_version_name" : "3.3.3237",
            "apk_package_name" : "com.proletariat.worldzombination",
            "apk_version_code" : "33537",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-15 00:00:00",
        }, 
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "apk_size" : "38.69M",
            "apk_version_name" : "1.7.1",
            "apk_package_name" : "com.outplayentertainment.aliencreeps",
            "apk_version_code" : "10070010",
            "game_rank" : 8,
            "customize_update_time" : "2015-04-25 00:00:00",
        }, 
        {
            "id" : 10357,
            "name_zh" : "合金弹头：防御",
            "apk_size" : "47.13M",
            "apk_version_name" : "1.27.0",
            "apk_package_name" : "com.snkplaymore.android003",
            "apk_version_code" : "52",
            "game_rank" : 8,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10360,
            "name_zh" : "绿色忍者蛙年",
            "apk_size" : "47.7M",
            "apk_version_name" : "4",
            "apk_package_name" : "com.nitrome.greenninja",
            "apk_version_code" : "4",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 15:52:10",
        }, 
        {
            "id" : 10364,
            "name_zh" : "杀死马里奥",
            "apk_size" : "31.16M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "air.com.keybol.plumber",
            "apk_version_code" : "1000006",
            "game_rank" : 7,
            "customize_update_time" : "2015-06-30 16:08:09", 
        }, 
        {
            "id" : 10366,
            "name_zh" : "通过繁殖征服世界",
            "apk_size" : "44.83M",
            "apk_version_name" : "1.0.2",
            "apk_package_name" : "com.kt.SpermWarWorldWide_G",
            "apk_version_code" : "10002",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:21:22", 
        }, 
        {
            "id" : 10229,
            "name_zh" : "冰块切割",
            "apk_size" : "7.14M",
            "apk_version_name" : "2.4.6",
            "apk_package_name" : "com.hyperkani.sliceice",
            "apk_version_code" : "30",
            "game_rank" : 7,
            "customize_update_time" : "2014-11-04 00:00:00",
        }, 
        {
            "id" : 10356,
            "name_zh" : "吃冰淇淋的怪房子",
            "apk_size" : "33.56M",
            "apk_version_name" : "1.0.2",
            "apk_package_name" : "com.firedroid.icecreamnomsters",
            "apk_version_code" : "4",
            "game_rank" : 8,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10358,
            "name_zh" : "来杯果汁",
            "apk_size" : "42.11M",
            "apk_version_name" : "1.6.21",
            "apk_package_name" : "air.com.sgn.juicejam.gp",
            "apk_version_code" : "1006021",
            "game_rank" : 6,
            "customize_update_time" : "0000-00-00 00:00:00",
        }, 
        {
            "id" : 10362,
            "name_zh" : "梦游先生",
            "apk_size" : "48.52M",
            "apk_version_name" : "1.00",
            "apk_package_name" : "com.BEbit.MrSnoozleberg",
            "apk_version_code" : "1",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 15:58:13",
        }, 
        {
            "id" : 10363,
            "name_zh" : "清凉方冰冰",
            "apk_size" : "23.14M",
            "apk_version_name" : "1.1",
            "apk_package_name" : "com.unilever.CoolCubeszzc",
            "apk_version_code" : "2",
            "game_rank" : 6,
            "customize_update_time" : "2015-06-30 16:04:56",
        }, 
        {
            "id" : 10365,
            "name_zh" : "嗜血狂鲨2",
            "apk_size" : "9.9M",
            "apk_version_name" : "2.6.1",
            "apk_package_name" : "com.fgol.shark2",
            "apk_version_code" : "13",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:15:58",
        }, 
        {
            "id" : 10367,
            "name_zh" : "外星人爱牛奶",
            "apk_size" : "23.86M",
            "apk_version_name" : "1.0.7",
            "apk_package_name" : "air.com.rightfusion.alienslikemilk",
            "apk_version_code" : "1000007",
            "game_rank" : 8,
            "customize_update_time" : "2015-06-30 16:28:17",
        }
    ]
}</code>

如何对子文档games进行分页查询
比如一次只取3条数据

<code>{
            "id" : 1128,
            "name_zh" : "追击野兽",
            "apk_size" : "38.15M",
            "apk_version_name" : "1.0.6",
            "apk_package_name" : "com.miniclip.beastquest",
            "apk_version_code" : "18",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-18 00:00:00",
        }, 
        {
            "id" : 3276,
            "name_zh" : "世界僵尸大联盟",
            "apk_size" : "33.88M",
            "apk_version_name" : "3.3.3237",
            "apk_package_name" : "com.proletariat.worldzombination",
            "apk_version_code" : "33537",
            "game_rank" : 8,
            "customize_update_time" : "2015-05-15 00:00:00",
        }, 
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "apk_size" : "38.69M",
            "apk_version_name" : "1.7.1",
            "apk_package_name" : "com.outplayentertainment.aliencreeps",
            "apk_version_code" : "10070010",
            "game_rank" : 8,
            "customize_update_time" : "2015-04-25 00:00:00",
        }
}</code>

<code>> db.test1.find().pretty()
{
    "_id" : ObjectId("55dc145ef754a3342000002d"),
    "games" : [
        {
            "id" : 1128,
            "name_zh" : "追击野兽",
            "customize_update_time" : "2015-05-18 00:00:00"
        },
        {
            "id" : 3276,
            "name_zh" : "dasda",
            "customize_update_time" : "2015-05-15 00:00:00"
        },
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "customize_update_time" : "2015-04-25 00:00:00"
        },
        {
            "id" : 10357,
            "name_zh" : "合金弹头：防御",
            "customize_update_time" : "0000-00-00 00:00:00"
        },
        {
            "id" : 10360,
            "name_zh" : "绿色忍者蛙年",
            "customize_update_time" : "2015-06-30 15:52:10"
        },
        {
            "id" : 10364,
            "name_zh" : "杀死马里奥",
            "customize_update_time" : "2015-06-30 16:08:09"
        },
        {
            "id" : 10366,
            "name_zh" : "通过繁殖征服世界",
            "customize_update_time" : "2015-06-30 16:21:22"
        },
        {
            "id" : 10229,
            "name_zh" : "冰块切割",
            "customize_update_time" : "2014-11-04 00:00:00"
        },
        {
            "id" : 10356,
            "name_zh" : "吃冰淇淋的怪房子",
            "customize_update_time" : "0000-00-00 00:00:00"
        },
        {
            "id" : 10358,
            "name_zh" : "来杯果汁",
            "customize_update_time" : "0000-00-00 00:00:00"
        },
        {
            "id" : 10362,
            "name_zh" : "梦游先生",
            "customize_update_time" : "2015-06-30 15:58:13"
        },
        {
            "id" : 10363,
            "name_zh" : "清凉方冰冰",
            "customize_update_time" : "2015-06-30 16:04:56"
        },
        {
            "id" : 10365,
            "name_zh" : "嗜血狂鲨2",
            "customize_update_time" : "2015-06-30 16:15:58"
        },
        {
            "id" : 10367,
            "name_zh" : "外星人爱牛奶",
            "customize_update_time" : "2015-06-30 16:28:17"
        }
    ]
}</code>

取games的前3条数据：

<code>> db.test1.find({"_id" : ObjectId("55dc145ef754a3342000002d")},{"games":{ "$slice":[0,3]}}).pretty()
{
    "_id" : ObjectId("55dc145ef754a3342000002d"),
    "games" : [
        {
            "id" : 1128,
            "name_zh" : "追击野兽",
            "customize_update_time" : "2015-05-18 00:00:00"
        },
        {
            "id" : 3276,
            "name_zh" : "dasda",
            "customize_update_time" : "2015-05-15 00:00:00"
        },
        {
            "id" : 3416,
            "name_zh" : "围剿外星客",
            "customize_update_time" : "2015-04-25 00:00:00"
        }
    ]
}</code>

取第四条到第6条数据：

<code>> db.test1.find({"_id" : ObjectId("55dc145ef754a3342000002d")},{"games":{ "$slice":[3,3]}}).pretty()
{
    "_id" : ObjectId("55dc145ef754a3342000002d"),
    "games" : [
        {
            "id" : 10357,
            "name_zh" : "合金弹头：防御",
            "customize_update_time" : "0000-00-00 00:00:00"
        },
        {
            "id" : 10360,
            "name_zh" : "绿色忍者蛙年",
            "customize_update_time" : "2015-06-30 15:52:10"
        },
        {
            "id" : 10364,
            "name_zh" : "杀死马里奥",
            "customize_update_time" : "2015-06-30 16:08:09"
        }
    ]
}</code>

依次类推，即可。 "$slice":[3,3] 第一个3表示查询数组下标的起始位置，第二个3表示取的数据条数。建议games不要过多，不然会超出文档限制16M。不过这个可能是设计问题，我多想了。

第二种方法：就是用代码从数据库中取出来，将games里面的每一个子文档封装成model，放在缓存中做分页，而不是数据库级别的分页也可实现

第三种方法：从数据可看出games里面的子文档是按照id进行排序的，那么也就是说子文档是可比较的，那么就可以使用$gt和$lt，接合$size取数据，我没有试。你可以尝试一下。不过$slice获取数组子集更方便一点。

用limit(n)可以限制只获取n条数据。skip(n)可以跳过n条数据,两者结合可以实现分页吧？不过skip比较消耗资源少用为妙。