插入 测试数据
for(var j=1;j<3;j++){
for(var i=1;i<3;i++){
var person={
Name:"jack"+i,
Age:i,
Address:["henan","wuhan"],
Course:[
{Name:"shuxue",Score:i},
{Name:"wuli",Score:i}
]
}
db.DemoTest.Person.insert(person)
}
}
Count
db.DemoTest.Person.count({Name:"jack1"})
返回数量
distinct
db.DemoTest.Person.distinct("Name")
返回不重复的Name值。
group
例子：按照Name分组，条件是Age大于46
db.DemoTest.Person.group({
"key":{"Name":true}, -----分组的keky
"initial":{"Person":[]},-------每组分享的一个”初始化函数“
"$reduce":function(cur,prev){ ------这个函数的第一个参数是当前的文档对象，第二个参数是上一次function操作的累计对象，第一次为initial中的{”person“：[]}。有多少个文档， $reduce就会调用多少次
prev.Person.push(cur);
},
"finalize":function(prev){ ---返回每组的数量
prev.count=prev.Person.length;
},
"condition":{"Age":{"$lt":46}} -----过滤条件
})
返回结果如下：
/* 0 */
{
"0" : {
"Name" : "jack1",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9d6"),
"Name" : "jack1",
"Age" : 1,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 1
},
{
"Name" : "wuli",
"Score" : 1
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba07"),
"Name" : "jack1",
"Age" : 1,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 1
},
{
"Name" : "wuli",
"Score" : 1
}
]
}
],
"count" : 2
},
"1" : {
"Name" : "jack2",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9d7"),
"Name" : "jack2",
"Age" : 2,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 2
},
{
"Name" : "wuli",
"Score" : 2
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba08"),
"Name" : "jack2",
"Age" : 2,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 2
},
{
"Name" : "wuli",
"Score" : 2
}
]
}
],
"count" : 2
},
"2" : {
"Name" : "jack3",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9d8"),
"Name" : "jack3",
"Age" : 3,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 3
},
{
"Name" : "wuli",
"Score" : 3
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba09"),
"Name" : "jack3",
"Age" : 3,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 3
},
{
"Name" : "wuli",
"Score" : 3
}
]
}
],
"count" : 2
},
"3" : {
"Name" : "jack4",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9d9"),
"Name" : "jack4",
"Age" : 4,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 4
},
{
"Name" : "wuli",
"Score" : 4
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0a"),
"Name" : "jack4",
"Age" : 4,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 4
},
{
"Name" : "wuli",
"Score" : 4
}
]
}
],
"count" : 2
},
"4" : {
"Name" : "jack5",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9da"),
"Name" : "jack5",
"Age" : 5,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 5
},
{
"Name" : "wuli",
"Score" : 5
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0b"),
"Name" : "jack5",
"Age" : 5,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 5
},
{
"Name" : "wuli",
"Score" : 5
}
]
}
],
"count" : 2
},
"5" : {
"Name" : "jack6",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9db"),
"Name" : "jack6",
"Age" : 6,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 6
},
{
"Name" : "wuli",
"Score" : 6
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0c"),
"Name" : "jack6",
"Age" : 6,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 6
},
{
"Name" : "wuli",
"Score" : 6
}
]
}
],
"count" : 2
},
"6" : {
"Name" : "jack7",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9dc"),
"Name" : "jack7",
"Age" : 7,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 7
},
{
"Name" : "wuli",
"Score" : 7
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0d"),
"Name" : "jack7",
"Age" : 7,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 7
},
{
"Name" : "wuli",
"Score" : 7
}
]
}
],
"count" : 2
},
"7" : {
"Name" : "jack8",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9dd"),
"Name" : "jack8",
"Age" : 8,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 8
},
{
"Name" : "wuli",
"Score" : 8
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0e"),
"Name" : "jack8",
"Age" : 8,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 8
},
{
"Name" : "wuli",
"Score" : 8
}
]
}
],
"count" : 2
},
"8" : {
"Name" : "jack9",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9de"),
"Name" : "jack9",
"Age" : 9,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 9
},
{
"Name" : "wuli",
"Score" : 9
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba0f"),
"Name" : "jack9",
"Age" : 9,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 9
},
{
"Name" : "wuli",
"Score" : 9
}
]
}
],
"count" : 2
},
"9" : {
"Name" : "jack10",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9df"),
"Name" : "jack10",
"Age" : 10,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 10
},
{
"Name" : "wuli",
"Score" : 10
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba10"),
"Name" : "jack10",
"Age" : 10,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 10
},
{
"Name" : "wuli",
"Score" : 10
}
]
}
],
"count" : 2
},
"10" : {
"Name" : "jack11",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e0"),
"Name" : "jack11",
"Age" : 11,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 11
},
{
"Name" : "wuli",
"Score" : 11
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba11"),
"Name" : "jack11",
"Age" : 11,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 11
},
{
"Name" : "wuli",
"Score" : 11
}
]
}
],
"count" : 2
},
"11" : {
"Name" : "jack12",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e1"),
"Name" : "jack12",
"Age" : 12,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 12
},
{
"Name" : "wuli",
"Score" : 12
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba12"),
"Name" : "jack12",
"Age" : 12,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 12
},
{
"Name" : "wuli",
"Score" : 12
}
]
}
],
"count" : 2
},
"12" : {
"Name" : "jack13",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e2"),
"Name" : "jack13",
"Age" : 13,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 13
},
{
"Name" : "wuli",
"Score" : 13
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba13"),
"Name" : "jack13",
"Age" : 13,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 13
},
{
"Name" : "wuli",
"Score" : 13
}
]
}
],
"count" : 2
},
"13" : {
"Name" : "jack14",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e3"),
"Name" : "jack14",
"Age" : 14,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 14
},
{
"Name" : "wuli",
"Score" : 14
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba14"),
"Name" : "jack14",
"Age" : 14,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 14
},
{
"Name" : "wuli",
"Score" : 14
}
]
}
],
"count" : 2
},
"14" : {
"Name" : "jack15",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e4"),
"Name" : "jack15",
"Age" : 15,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 15
},
{
"Name" : "wuli",
"Score" : 15
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba15"),
"Name" : "jack15",
"Age" : 15,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 15
},
{
"Name" : "wuli",
"Score" : 15
}
]
}
],
"count" : 2
},
"15" : {
"Name" : "jack16",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e5"),
"Name" : "jack16",
"Age" : 16,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 16
},
{
"Name" : "wuli",
"Score" : 16
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba16"),
"Name" : "jack16",
"Age" : 16,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 16
},
{
"Name" : "wuli",
"Score" : 16
}
]
}
],
"count" : 2
},
"16" : {
"Name" : "jack17",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e6"),
"Name" : "jack17",
"Age" : 17,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 17
},
{
"Name" : "wuli",
"Score" : 17
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba17"),
"Name" : "jack17",
"Age" : 17,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 17
},
{
"Name" : "wuli",
"Score" : 17
}
]
}
],
"count" : 2
},
"17" : {
"Name" : "jack18",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e7"),
"Name" : "jack18",
"Age" : 18,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 18
},
{
"Name" : "wuli",
"Score" : 18
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba18"),
"Name" : "jack18",
"Age" : 18,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 18
},
{
"Name" : "wuli",
"Score" : 18
}
]
}
],
"count" : 2
},
"18" : {
"Name" : "jack19",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e8"),
"Name" : "jack19",
"Age" : 19,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 19
},
{
"Name" : "wuli",
"Score" : 19
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba19"),
"Name" : "jack19",
"Age" : 19,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 19
},
{
"Name" : "wuli",
"Score" : 19
}
]
}
],
"count" : 2
},
"19" : {
"Name" : "jack20",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9e9"),
"Name" : "jack20",
"Age" : 20,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 20
},
{
"Name" : "wuli",
"Score" : 20
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1a"),
"Name" : "jack20",
"Age" : 20,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 20
},
{
"Name" : "wuli",
"Score" : 20
}
]
}
],
"count" : 2
},
"20" : {
"Name" : "jack21",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9ea"),
"Name" : "jack21",
"Age" : 21,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 21
},
{
"Name" : "wuli",
"Score" : 21
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1b"),
"Name" : "jack21",
"Age" : 21,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 21
},
{
"Name" : "wuli",
"Score" : 21
}
]
}
],
"count" : 2
},
"21" : {
"Name" : "jack22",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9eb"),
"Name" : "jack22",
"Age" : 22,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 22
},
{
"Name" : "wuli",
"Score" : 22
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1c"),
"Name" : "jack22",
"Age" : 22,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 22
},
{
"Name" : "wuli",
"Score" : 22
}
]
}
],
"count" : 2
},
"22" : {
"Name" : "jack23",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9ec"),
"Name" : "jack23",
"Age" : 23,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 23
},
{
"Name" : "wuli",
"Score" : 23
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1d"),
"Name" : "jack23",
"Age" : 23,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 23
},
{
"Name" : "wuli",
"Score" : 23
}
]
}
],
"count" : 2
},
"23" : {
"Name" : "jack24",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9ed"),
"Name" : "jack24",
"Age" : 24,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 24
},
{
"Name" : "wuli",
"Score" : 24
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1e"),
"Name" : "jack24",
"Age" : 24,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 24
},
{
"Name" : "wuli",
"Score" : 24
}
]
}
],
"count" : 2
},
"24" : {
"Name" : "jack25",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9ee"),
"Name" : "jack25",
"Age" : 25,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 25
},
{
"Name" : "wuli",
"Score" : 25
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba1f"),
"Name" : "jack25",
"Age" : 25,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 25
},
{
"Name" : "wuli",
"Score" : 25
}
]
}
],
"count" : 2
},
"25" : {
"Name" : "jack26",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9ef"),
"Name" : "jack26",
"Age" : 26,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 26
},
{
"Name" : "wuli",
"Score" : 26
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba20"),
"Name" : "jack26",
"Age" : 26,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 26
},
{
"Name" : "wuli",
"Score" : 26
}
]
}
],
"count" : 2
},
"26" : {
"Name" : "jack27",
"Person" : [
{
"_id" : ObjectId("54461dce69f872cf5ea2b9f0"),
"Name" : "jack27",
"Age" : 27,
"Address" : [
"henan",
"wuhan"
],
"Course" : [
{
"Name" : "shuxue",
"Score" : 27
},
{
"Name" : "wuli",
"Score" : 27
}
]
},
{
"_id" : ObjectId("54461dce69f872cf5ea2ba21"),
"Name" : "jack27",
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