mongo数据库基本查询语句

D:\MongoDB\Server\3.4\bin>mongo

MongoDB shell version v3.4.16--g83c3022fe4

connecting to: mongodb://127.0.0.1:27017

MongoDB server version: 3.4.--g83c3022fe4

Server has startup warnings:

--04T11::41.286+ I CONTROL  [initandlisten]

--04T11::41.286+ I CONTROL  [initandlisten] ** WARNING: Access control is not enabled fo

r the database.

--04T11::41.286+ I CONTROL  [initandlisten] **          Read and write access to data an

d configuration is unrestricted.

--04T11::41.286+ I CONTROL  [initandlisten]

--04T11::41.286+ I CONTROL  [initandlisten] Hotfix KB2731284 or later update is not inst

alled, will zero-out data files.

--04T11::41.286+ I CONTROL  [initandlisten]

> show dbs

admin  .000GB

local  .000GB

test   .000GB

> use students

switched to db students

> db.class.insert({'name':'吴唐华'})

WriteResult({ "nInserted" :  })

> show collections

class

> db.class.drop()

true

> db.class2.insert({'name':'cwl','age':,'sex':})

WriteResult({ "nInserted" :  })

> db.class2.insert({'name':'yt','age':,'sex':})

WriteResult({ "nInserted" :  })

> db.class2.insert({'name':'jn','age':,'sex':})

WriteResult({ "nInserted" :  })

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

> db.class2.updata({'age':},{$set:{'age':}})

--04T14::23.195+ E QUERY    [thread1] TypeError: db.class2.updata is not a function :

@(shell)::

> db.class2.update({'age':},{$set:{'age':}})

WriteResult({ "nMatched" : , "nUpserted" : , "nModified" :  })

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

> db.col.find({"name":{$type:}})

> db.class2.find({"name":{$type:}})

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

>

> db.class.find()pretty()

--04T15::22.253+ E QUERY    [thread1] SyntaxError: missing ; before statement @(shell):

:

> db.class.pretty()

--04T15::30.826+ E QUERY    [thread1] TypeError: db.class.pretty is not a function :

@(shell)::

> db.class2.update({'age':{$gt:},{$set:{'sex':}})

... db.class2.find({"name":{$type:}})

...

... db.class2.update({'age':},{$set:{'age':}})

> db.class2.update({'age':},{$set:{'age':}})

WriteResult({ "nMatched" : , "nUpserted" : , "nModified" :  })

> db.class2.update({'age':},{$set:{'age':}})

WriteResult({ "nMatched" : , "nUpserted" : , "nModified" :  })

> db.class2.update({'age':{$gt:}},{$set:{'sex':}},true,true)

WriteResult({ "nMatched" : , "nUpserted" : , "nModified" :  })

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

> db.class2.find().pretty()

{

        "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"),

        "name" : "cwl",

        "age" : ,

        "sex" :

}

{

        "_id" : ObjectId("5d6f5be99b7e3e911a123a84"),

        "name" : "yt",

        "age" : ,

        "sex" :

}

{

        "_id" : ObjectId("5d6f5c139b7e3e911a123a85"),

        "name" : "jn",

        "age" : ,

        "sex" :

}

> db.class2.update({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true)

WriteResult({

        "nMatched" : ,

        "nUpserted" : ,

        "nModified" : ,

        "_id" : ObjectId("5d6f69b56685a146689b9147")

})

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f69b56685a146689b9147"), "name" : "lys", "age" : , "sex" : "yes" }

> db.class2.update({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true)

WriteResult({ "nMatched" : , "nUpserted" : , "nModified" :  })

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f69b56685a146689b9147"), "name" : "lys", "age" : , "sex" : "yes" }

> db.class2.update({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true).find()

--04T15::22.078+ E QUERY    [thread1] TypeError: db.class2.update(...).find is not a fun

ction :

@(shell)::

> db.class2.find(db.class2.update({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true))

Error: error: {

        "ok" : ,

        "errmsg" : "cannot compare to undefined",

        "code" : ,

        "codeName" : "BadValue"

}

> db.class2.find({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true).find()

--04T15::16.304+ E QUERY    [thread1] TypeError: db.class2.find(...).find is not a funct

ion :

@(shell)::

> db.class2.find(db.class2.update({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true))

Error: error: {

        "ok" : ,

        "errmsg" : "cannot compare to undefined",

        "code" : ,

        "codeName" : "BadValue"

}

> db.class2.find({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true)

Error: error: {

        "ok" : ,

        "errmsg" : ">1 field in obj: { age: 12.0, sex: \"yes\" }",

        "code" : ,

        "codeName" : "BadValue"

}

> db.class2.find({'name':'mgq'},{$set:{'age':,"sex":'yes'}},true,true)

Error: error: {

        "ok" : ,

        "errmsg" : ">1 field in obj: { age: 12.0, sex: \"yes\" }",

        "code" : ,

        "codeName" : "BadValue"

}

> db.class2.find()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" : , "sex" :  }

{ "_id" : ObjectId("5d6f69b56685a146689b9147"), "name" : "lys", "age" : , "sex" : "yes" }

> db.class2.find({'name':'lys'},{$set:{'age':,"sex":'yes'}},true,true)

Error: error: {

        "ok" : ,

        "errmsg" : ">1 field in obj: { age: 12.0, sex: \"yes\" }",

        "code" : ,

        "codeName" : "BadValue"

}

> db.class2.find({'by':'lys'})

> db.class2.find({'by':'lys'})

> db.class2.find({'by':'lys'}).pretty()

> db.class2.insert({'name':'yt','class':'','age':,'money':})

WriteResult({ "nInserted" :  })

> db.class2.insert({'name':'clw','class':'','age':,'money':})

WriteResult({ "nInserted" :  })

> db.class2.insert({'name':'szy','class':'','age':,'money':})

WriteResult({ "nInserted" :  })

> db.class2.insert({'name':'szy','class':'','age':,'money':})

WriteResult({ "nInserted" :  })

> db.class.find({$or:[{'class':''},{'class':''}]})

> db.class.find({$or:[{'class':''},{'class':''}]})

> db.class2.find({$or:[{'class':''},{'class':''}]})

{ "_id" : ObjectId("5d6f739e9b7e3e911a123a86"), "name" : "yt", "class" : "", "age" : , "money"

 :  }

{ "_id" : ObjectId("5d6f73bb9b7e3e911a123a87"), "name" : "clw", "class" : "", "age" : , "money

" : 20000 }

{ "_id" : ObjectId("5d6f73f69b7e3e911a123a88"), "name" : "szy", "class" : "", "age" : , "money

" : 20000000 }

{ "_id" : ObjectId("5d6f73ff9b7e3e911a123a89"), "name" : "szy", "class" : "", "age" : , "money

" : 20 }

> db.class2.insert({'name':'lm','class':'','age':,'money':})

WriteResult({ "nInserted" :  })

> db.class.find({'money':{$gte:},$or:[{'class':},{'class':''}]}).pretty()

> db.class2.find({'money':{$gte:},$or:[{'class':},{'class':''}]}).pretty()

{

        "_id" : ObjectId("5d6f739e9b7e3e911a123a86"),

        "name" : "yt",

        "class" : "",

        "age" : ,

        "money" :

}

{

        "_id" : ObjectId("5d6f73bb9b7e3e911a123a87"),

        "name" : "clw",

        "class" : "",

        "age" : ,

        "money" :

}

> db.class2.find({'money':{$gte:},$or:[{'class':},{'class':''}]},{'_id':,'class':).pre

tty()

...

... db.class.find({'money':{$gte:},$or:[{'class':},{'class':''}]},{'class':}).pretty()

...

...

>

>

> db.class2.find({'money':{$gte:},$or:[{'class':},{'class':''}]},{'class':}).pretty()

{ "_id" : ObjectId("5d6f739e9b7e3e911a123a86"), "class" : "" }

{ "_id" : ObjectId("5d6f73bb9b7e3e911a123a87"), "class" : "" }

> db.class2.find({},{'mame':}).limit()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83") }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84") }

> db.class2.find({},{'name':}).limit()

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl" }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt" }

> db.class2.find({},{'name':,'age':}).sort({'age':-})

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" :  }

{ "_id" : ObjectId("5d6f739e9b7e3e911a123a86"), "name" : "yt", "age" :  }

{ "_id" : ObjectId("5d6f73bb9b7e3e911a123a87"), "name" : "clw", "age" :  }

{ "_id" : ObjectId("5d6f73f69b7e3e911a123a88"), "name" : "szy", "age" :  }

{ "_id" : ObjectId("5d6f73ff9b7e3e911a123a89"), "name" : "szy", "age" :  }

{ "_id" : ObjectId("5d6f75509b7e3e911a123a8a"), "name" : "lm", "age" :  }

{ "_id" : ObjectId("5d6f69b56685a146689b9147"), "name" : "lys", "age" :  }

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" :  }

> db.class2.find({},{'name':,'age':}).sort({'age':})

{ "_id" : ObjectId("5d6f5ba19b7e3e911a123a83"), "name" : "cwl", "age" :  }

{ "_id" : ObjectId("5d6f69b56685a146689b9147"), "name" : "lys", "age" :  }

{ "_id" : ObjectId("5d6f73bb9b7e3e911a123a87"), "name" : "clw", "age" :  }

{ "_id" : ObjectId("5d6f73f69b7e3e911a123a88"), "name" : "szy", "age" :  }

{ "_id" : ObjectId("5d6f73ff9b7e3e911a123a89"), "name" : "szy", "age" :  }

{ "_id" : ObjectId("5d6f75509b7e3e911a123a8a"), "name" : "lm", "age" :  }

{ "_id" : ObjectId("5d6f5be99b7e3e911a123a84"), "name" : "yt", "age" :  }

{ "_id" : ObjectId("5d6f5c139b7e3e911a123a85"), "name" : "jn", "age" :  }

{ "_id" : ObjectId("5d6f739e9b7e3e911a123a86"), "name" : "yt", "age" :  }

> db.class2.count()

> db.class2.aggregate([{$group:{_id:'class',num:{$max:'money'}}}])

{ "_id" : "class", "num" : "money" }

> db.class2.aggregate([{$group:{_id:'class',num:{$max:'money'}}}])

{ "_id" : "class", "num" : "money" }

> db.class2.aggregate([{$group:{_id:'class',num:{$max:'money'}}}])

{ "_id" : "class", "num" : "money" }

> db.class2.aggregate([{$group:{'_id':'class',num:{$max:'money'}}}])

{ "_id" : "class", "num" : "money" }

> db.class2.aggregate([{$group:{_id:'class',num:{$max:'$money'}}}])

{ "_id" : "class", "num" :  }

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