#mongodb#速成笔记
操作记录与总结：
show dbs
use SOME_DB(既是选定某个DB，又可以创建一个新的DB【注意要写入数据，新的SOME_DB不可为空】）
show collections
$inc
> db.simple.find()
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 12 }
{ "_id" : ObjectId("54e9dc37a4c00ba20f4432ae"), "name" : "bcd", "age" : 13 }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
> db.simple.update({"name":"abc"},{$inc:{"sex":"none"}})
WriteResult({
"nMatched" : 0,
"nUpserted" : 0,
"nModified" : 0,
"writeError" : {
"code" : 14,
"errmsg" : "Cannot increment with non-numeric argument: {sex: \"none\"}"
}
})
> db.simple.update({"name":"abc"},{$inc:{"age":50}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.simple.find()
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 62 }
{ "_id" : ObjectId("54e9dc37a4c00ba20f4432ae"), "name" : "bcd", "age" : 13 }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
总结：$inc后只能跟数字，用于数值的递增
$set
> db.simple.update({"name":"abc"},{$set:{"sex":"none"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.simple.find()
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 62, "sex" : "none" }
{ "_id" : ObjectId("54e9dc37a4c00ba20f4432ae"), "name" : "bcd", "age" : 13 }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
>
总结：$set后可以为字符串之类的东西
$in，$or，$nin
> db.simple.find({"wife":{$in:["jc"]}})
{ "_id" : ObjectId("54ec289e560c1ea13477ce89"), "name" : "xul", "wife" : [ "jc", "juhua" ] }
{ "_id" : ObjectId("54ec28b8560c1ea13477ce8a"), "name" : "jack", "wife" : [ "jc", "huangrui" ] }
> db.simple.find({"wife":{$nin:["jc"]}})
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 62, "sex" : "none" }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
{ "_id" : ObjectId("54ec259d560c1ea13477ce85"), "name" : "def", "age" : 14 }
{ "_id" : ObjectId("54ec25ac560c1ea13477ce86"), "name" : "abc", "age" : 16 }
> db.simple.find({"wife":{$in:["huangrui"]}})
{ "_id" : ObjectId("54ec28b8560c1ea13477ce8a"), "name" : "jack", "wife" : [ "jc", "huangrui" ] }
> db.simple.find({"wife":{$in:["juhua"]}})
{ "_id" : ObjectId("54ec289e560c1ea13477ce89"), "name" : "xul", "wife" : [ "jc", "juhua" ] }
> db.simple.find({$or:[{"age":14},{"age":16}]})
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54ec259d560c1ea13477ce85"), "name" : "def", "age" : 14 }
{ "_id" : ObjectId("54ec25ac560c1ea13477ce86"), "name" : "abc", "age" : 16 }
>
>
> db.simple.find({"wife":{$nin:["jc"]}})
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 62, "sex" : "none" }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
{ "_id" : ObjectId("54ec259d560c1ea13477ce85"), "name" : "def", "age" : 14 }
{ "_id" : ObjectId("54ec25ac560c1ea13477ce86"), "name" : "abc", "age" : 16 }
{ "_id" : ObjectId("54ec38ab560c1ea13477ce8b"), "name" : "jc", "hus" : [ "shit" ] }
{ "_id" : ObjectId("54ec38be560c1ea13477ce8c"), "name" : "juhua", "wife" : [ "shit" ] }
>
不要在意那些奇葩的数据！
总结：没什么好说的，就是没有$not
count：
> db.simple.count({"age":14})
2
> db.simple.count({"age":16})
2
distinct：去重
> db.simple.find()
{ "_id" : ObjectId("54e9dc1fa4c00ba20f4432ad"), "name" : "abc", "age" : 62, "sex" : "none" }
{ "_id" : ObjectId("54e9dc52a4c00ba20f4432af"), "name" : "cde", "age" : 14 }
{ "_id" : ObjectId("54e9dc64a4c00ba20f4432b0"), "name" : "def", "age" : 16 }
{ "_id" : ObjectId("54e9dc75a4c00ba20f4432b1"), "name" : "def", "age" : 656 }
{ "_id" : ObjectId("54ec259d560c1ea13477ce85"), "name" : "def", "age" : 14 }
{ "_id" : ObjectId("54ec25ac560c1ea13477ce86"), "name" : "abc", "age" : 16 }
{ "_id" : ObjectId("54ec289e560c1ea13477ce89"), "name" : "xul", "wife" : [ "jc", "juhua" ] }
{ "_id" : ObjectId("54ec28b8560c1ea13477ce8a"), "name" : "jack", "wife" : [ "jc", "huangrui" ] }
> db.simple.disinct("age)
2015-02-24T16:14:03.415+0800 SyntaxError: Unexpected token ILLEGAL
> db.simple.disinct("age")
2015-02-24T16:14:05.554+0800 TypeError: Property 'disinct' of object name.simple is not a function
> db.simple.distinct("age")
[ 62, 14, 16, 656 ]
> db.simple.distinct("name")
[ "abc", "cde", "def", "xul", "jack" ]
>
另一篇参考：
常用命令：http://www.cnblogs.com/cxd4321/archive/2011/06/24/2089051.html