文档结构如下：
{
"_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",
}
]
}如何对子文档games进行分页查询
比如一次只取3条数据
{
"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",
}
}> 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"
}
]
}取games的前3条数据：
> db.test1.find({"_id" : ObjectId("55dc145ef754a3342000002d")},{"games":{ "$slice":[0,3]}}).pretty()
{
"_id" : ObjectId("55dc145ef754a3342000002d"),
"games" : [
{
"id" : 1128,
"name_zh" : "追击野兽",
"customize_update_time" : "2015-05-18 00:00:00"
},
{
"id" : 3276,
"name_zh" : "dasda",
"customize_update_time" : "2015-05-15 00:00:00"
},
{
"id" : 3416,
"name_zh" : "围剿外星客",
"customize_update_time" : "2015-04-25 00:00:00"
}
]
}取第四条到第6条数据：
> db.test1.find({"_id" : ObjectId("55dc145ef754a3342000002d")},{"games":{ "$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"
}
]
}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。